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audk/MdePkg/Include/Library/BaseLib.h

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/** @file
Provides string functions, linked list functions, math functions, synchronization
functions, file path functions, and CPU architecture-specific functions.
Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.<BR>
Portions Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
Portions Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __BASE_LIB__
#define __BASE_LIB__
//
// Definitions for architecture-specific types
//
#if defined (MDE_CPU_IA32)
///
/// The IA-32 architecture context buffer used by SetJump() and LongJump().
///
typedef struct {
UINT32 Ebx;
UINT32 Esi;
UINT32 Edi;
UINT32 Ebp;
UINT32 Esp;
UINT32 Eip;
UINT32 Ssp;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 4
#endif // defined (MDE_CPU_IA32)
#if defined (MDE_CPU_X64)
///
/// The x64 architecture context buffer used by SetJump() and LongJump().
///
typedef struct {
UINT64 Rbx;
UINT64 Rsp;
UINT64 Rbp;
UINT64 Rdi;
UINT64 Rsi;
UINT64 R12;
UINT64 R13;
UINT64 R14;
UINT64 R15;
UINT64 Rip;
UINT64 MxCsr;
UINT8 XmmBuffer[160]; ///< XMM6-XMM15.
UINT64 Ssp;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
#endif // defined (MDE_CPU_X64)
#if defined (MDE_CPU_EBC)
///
/// The EBC context buffer used by SetJump() and LongJump().
///
typedef struct {
UINT64 R0;
UINT64 R1;
UINT64 R2;
UINT64 R3;
UINT64 IP;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
#endif // defined (MDE_CPU_EBC)
#if defined (MDE_CPU_ARM)
typedef struct {
UINT32 R3; ///< A copy of R13.
UINT32 R4;
UINT32 R5;
UINT32 R6;
UINT32 R7;
UINT32 R8;
UINT32 R9;
UINT32 R10;
UINT32 R11;
UINT32 R12;
UINT32 R14;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 4
#endif // defined (MDE_CPU_ARM)
#if defined (MDE_CPU_AARCH64)
typedef struct {
// GP regs
UINT64 X19;
UINT64 X20;
UINT64 X21;
UINT64 X22;
UINT64 X23;
UINT64 X24;
UINT64 X25;
UINT64 X26;
UINT64 X27;
UINT64 X28;
UINT64 FP;
UINT64 LR;
UINT64 IP0;
// FP regs
UINT64 D8;
UINT64 D9;
UINT64 D10;
UINT64 D11;
UINT64 D12;
UINT64 D13;
UINT64 D14;
UINT64 D15;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
#endif // defined (MDE_CPU_AARCH64)
#if defined (MDE_CPU_RISCV64)
///
/// The RISC-V architecture context buffer used by SetJump() and LongJump().
///
typedef struct {
UINT64 RA;
UINT64 S0;
UINT64 S1;
UINT64 S2;
UINT64 S3;
UINT64 S4;
UINT64 S5;
UINT64 S6;
UINT64 S7;
UINT64 S8;
UINT64 S9;
UINT64 S10;
UINT64 S11;
UINT64 SP;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
VOID
RiscVSetSupervisorScratch (
IN UINT64
);
UINT64
RiscVGetSupervisorScratch (
VOID
);
VOID
RiscVSetSupervisorStvec (
IN UINT64
);
UINT64
RiscVGetSupervisorStvec (
VOID
);
UINT64
RiscVGetSupervisorTrapCause (
VOID
);
VOID
RiscVSetSupervisorAddressTranslationRegister (
IN UINT64
);
UINT64
RiscVGetSupervisorAddressTranslationRegister (
VOID
);
UINT64
RiscVReadTimer (
VOID
);
VOID
RiscVSetSupervisorTimeCompareRegister (
IN UINT64
);
VOID
RiscVEnableTimerInterrupt (
VOID
);
VOID
RiscVDisableTimerInterrupt (
VOID
);
VOID
RiscVClearPendingTimerInterrupt (
VOID
);
/**
RISC-V invalidate instruction cache.
**/
VOID
EFIAPI
RiscVInvalidateInstCacheFenceAsm (
VOID
);
/**
RISC-V invalidate data cache.
**/
VOID
EFIAPI
RiscVInvalidateDataCacheFenceAsm (
VOID
);
/**
RISC-V flush cache block. Atomically perform a clean operation
followed by an invalidate operation
**/
VOID
EFIAPI
RiscVCpuCacheFlushCmoAsm (
IN UINTN
);
/**
Perform a write transfer to another cache or to memory if the
data in the copy of the cache block have been modified by a store
operation
**/
VOID
EFIAPI
RiscVCpuCacheCleanCmoAsm (
IN UINTN
);
/**
Deallocate the copy of the cache block
**/
VOID
EFIAPI
RiscVCpuCacheInvalCmoAsm (
IN UINTN
);
#endif // defined (MDE_CPU_RISCV64)
#if defined (MDE_CPU_LOONGARCH64)
///
/// The LoongArch architecture context buffer used by SetJump() and LongJump()
///
typedef struct {
UINT64 S0;
UINT64 S1;
UINT64 S2;
UINT64 S3;
UINT64 S4;
UINT64 S5;
UINT64 S6;
UINT64 S7;
UINT64 S8;
UINT64 SP;
UINT64 FP;
UINT64 RA;
} BASE_LIBRARY_JUMP_BUFFER;
#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8
/*
* Set the exception base address for LoongArch.
*
* @param ExceptionBaseAddress The exception base address, must be aligned greater than or qeual to 4K .
*/
VOID
SetExceptionBaseAddress (
IN UINT64
);
/*
* Set the TlbRebase address for LoongArch.
*
* @param TlbRebaseAddress The TlbRebase address, must be aligned greater than or qeual to 4K .
*/
VOID
SetTlbRebaseAddress (
IN UINT64
);
/**
Enables local CPU interrupts.
@param Needs to enable local interrupt bit.
**/
VOID
EnableLocalInterrupts (
IN UINT16
);
/**
Disables local CPU interrupts.
@param Needs to disable local interrupt bit.
**/
VOID
DisableLocalInterrupts (
IN UINT16
);
/**
Read CPUCFG register.
@param Index Specifies the register number of the CPUCFG to read the data.
@param Data A pointer to the variable used to store the CPUCFG register value.
**/
VOID
AsmCpucfg (
IN UINT32 Index,
OUT UINT32 *Data
);
/**
Gets the timer count value.
@param[] VOID
@retval timer count value.
**/
UINTN
AsmReadStableCounter (
VOID
);
/**
CSR read operation.
@param[in] Select CSR read instruction select values.
@return The return value of csrrd instruction, return -1 means no CSR instruction
is found.
**/
UINTN
CsrRead (
IN UINT16 Select
);
/**
CSR write operation.
@param[in] Select CSR write instruction select values.
@param[in] Value The csrwr will write the value.
@return The return value of csrwr instruction, that is, store the old value of
the register, return -1 means no CSR instruction is found.
**/
UINTN
CsrWrite (
IN UINT16 Select,
IN UINTN Value
);
/**
CSR exchange operation.
@param[in] Select CSR exchange instruction select values.
@param[in] Value The csrxchg will write the value.
@param[in] Mask The csrxchg mask value.
@return The return value of csrxchg instruction, that is, store the old value of
the register, return -1 means no CSR instruction is found.
**/
UINTN
CsrXChg (
IN UINT16 Select,
IN UINTN Value,
IN UINTN Mask
);
/**
IO CSR read byte operation.
@param[in] Select IO CSR read instruction select values.
@return The return value of iocsrrd.b instruction.
**/
UINT8
IoCsrRead8 (
IN UINTN Select
);
/**
IO CSR read half word operation.
@param[in] Select IO CSR read instruction select values.
@return The return value of iocsrrd.h instruction.
**/
UINT16
IoCsrRead16 (
IN UINTN Select
);
/**
IO CSR read word operation.
@param[in] Select IO CSR read instruction select values.
@return The return value of iocsrrd.w instruction.
**/
UINT32
IoCsrRead32 (
IN UINTN Select
);
/**
IO CSR read double word operation. Only for LoongArch64.
@param[in] Select IO CSR read instruction select values.
@return The return value of iocsrrd.d instruction.
**/
UINT64
IoCsrRead64 (
IN UINTN Select
);
/**
IO CSR write byte operation.
@param[in] Select IO CSR write instruction select values.
@param[in] Value The iocsrwr.b will write the value.
@return VOID.
**/
VOID
IoCsrWrite8 (
IN UINTN Select,
IN UINT8 Value
);
/**
IO CSR write half word operation.
@param[in] Select IO CSR write instruction select values.
@param[in] Value The iocsrwr.h will write the value.
@return VOID.
**/
VOID
IoCsrWrite16 (
IN UINTN Select,
IN UINT16 Value
);
/**
IO CSR write word operation.
@param[in] Select IO CSR write instruction select values.
@param[in] Value The iocsrwr.w will write the value.
@return VOID.
**/
VOID
IoCsrWrite32 (
IN UINTN Select,
IN UINT32 Value
);
/**
IO CSR write double word operation. Only for LoongArch64.
@param[in] Select IO CSR write instruction select values.
@param[in] Value The iocsrwr.d will write the value.
@return VOID.
**/
VOID
IoCsrWrite64 (
IN UINTN Select,
IN UINT64 Value
);
#endif // defined (MDE_CPU_LOONGARCH64)
//
// String Services
//
/**
Returns the length of a Null-terminated Unicode string.
This function is similar as strlen_s defined in C11.
If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param MaxSize The maximum number of Destination Unicode
char, including terminating null char.
@retval 0 If String is NULL.
@retval MaxSize If there is no null character in the first MaxSize characters of String.
@return The number of characters that percede the terminating null character.
**/
UINTN
EFIAPI
StrnLenS (
IN CONST CHAR16 *String,
IN UINTN MaxSize
);
/**
Returns the size of a Null-terminated Unicode string in bytes, including the
Null terminator.
This function returns the size of the Null-terminated Unicode string
specified by String in bytes, including the Null terminator.
If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param MaxSize The maximum number of Destination Unicode
char, including the Null terminator.
@retval 0 If String is NULL.
@retval (sizeof (CHAR16) * (MaxSize + 1))
If there is no Null terminator in the first MaxSize characters of
String.
@return The size of the Null-terminated Unicode string in bytes, including
the Null terminator.
**/
UINTN
EFIAPI
StrnSizeS (
IN CONST CHAR16 *String,
IN UINTN MaxSize
);
/**
Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode
char, including terminating null char.
@param Source A pointer to a Null-terminated Unicode string.
@retval RETURN_SUCCESS String is copied.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
StrCpyS (
OUT CHAR16 *Destination,
IN UINTN DestMax,
IN CONST CHAR16 *Source
);
/**
Copies not more than Length successive char from the string pointed to by
Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode
char, including terminating null char.
@param Source A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to copy.
@retval RETURN_SUCCESS String is copied.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
MIN(StrLen(Source), Length).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
StrnCpyS (
OUT CHAR16 *Destination,
IN UINTN DestMax,
IN CONST CHAR16 *Source,
IN UINTN Length
);
/**
Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode
char, including terminating null char.
@param Source A pointer to a Null-terminated Unicode string.
@retval RETURN_SUCCESS String is appended.
@retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than
StrLen(Destination).
@retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT
greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
StrCatS (
IN OUT CHAR16 *Destination,
IN UINTN DestMax,
IN CONST CHAR16 *Source
);
/**
Appends not more than Length successive char from the string pointed to by
Source to the end of the string pointed to by Destination. If no null char is
copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null.
This function is similar as strncat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode
char, including terminating null char.
@param Source A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to copy.
@retval RETURN_SUCCESS String is appended.
@retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than
StrLen(Destination).
@retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT
greater than MIN(StrLen(Source), Length).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
StrnCatS (
IN OUT CHAR16 *Destination,
IN UINTN DestMax,
IN CONST CHAR16 *Source,
IN UINTN Length
);
/**
Convert a Null-terminated Unicode decimal string to a value of type UINTN.
This function outputs a value of type UINTN by interpreting the contents of
the Unicode string specified by String as a decimal number. The format of the
input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before
[decimal digits]. The running zero in the beginning of [decimal digits] will
be ignored. Then, the function stops at the first character that is a not a
valid decimal character or a Null-terminator, whichever one comes first.
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has no valid decimal digits in the above format, then 0 is stored
at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINTN, then
MAX_UINTN is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
decimal digits right after the optional pad spaces, the value of String is
stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumUnicodeStringLength is not
zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINTN.
**/
RETURN_STATUS
EFIAPI
StrDecimalToUintnS (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT UINTN *Data
);
/**
Convert a Null-terminated Unicode decimal string to a value of type UINT64.
This function outputs a value of type UINT64 by interpreting the contents of
the Unicode string specified by String as a decimal number. The format of the
input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before
[decimal digits]. The running zero in the beginning of [decimal digits] will
be ignored. Then, the function stops at the first character that is a not a
valid decimal character or a Null-terminator, whichever one comes first.
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has no valid decimal digits in the above format, then 0 is stored
at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINT64, then
MAX_UINT64 is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
decimal digits right after the optional pad spaces, the value of String is
stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumUnicodeStringLength is not
zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINT64.
**/
RETURN_STATUS
EFIAPI
StrDecimalToUint64S (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT UINT64 *Data
);
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type
UINTN.
This function outputs a value of type UINTN by interpreting the contents of
the Unicode string specified by String as a hexadecimal number. The format of
the input Unicode string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab
characters, before [zeros], [x] or [hexadecimal digit]. The running zero
before [x] or [hexadecimal digit] will be ignored. Then, the decoding starts
after [x] or the first valid hexadecimal digit. Then, the function stops at
the first character that is a not a valid hexadecimal character or NULL,
whichever one comes first.
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has no valid hexadecimal digits in the above format, then 0 is
stored at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINTN, then
MAX_UINTN is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
hexadecimal digits right after the optional pad spaces, the value of String
is stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumUnicodeStringLength is not
zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINTN.
**/
RETURN_STATUS
EFIAPI
StrHexToUintnS (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT UINTN *Data
);
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type
UINT64.
This function outputs a value of type UINT64 by interpreting the contents of
the Unicode string specified by String as a hexadecimal number. The format of
the input Unicode string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab
characters, before [zeros], [x] or [hexadecimal digit]. The running zero
before [x] or [hexadecimal digit] will be ignored. Then, the decoding starts
after [x] or the first valid hexadecimal digit. Then, the function stops at
the first character that is a not a valid hexadecimal character or NULL,
whichever one comes first.
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has no valid hexadecimal digits in the above format, then 0 is
stored at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINT64, then
MAX_UINT64 is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
hexadecimal digits right after the optional pad spaces, the value of String
is stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumUnicodeStringLength is not
zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINT64.
**/
RETURN_STATUS
EFIAPI
StrHexToUint64S (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT UINT64 *Data
);
/**
Returns the length of a Null-terminated Ascii string.
This function is similar as strlen_s defined in C11.
@param String A pointer to a Null-terminated Ascii string.
@param MaxSize The maximum number of Destination Ascii
char, including terminating null char.
@retval 0 If String is NULL.
@retval MaxSize If there is no null character in the first MaxSize characters of String.
@return The number of characters that percede the terminating null character.
**/
UINTN
EFIAPI
AsciiStrnLenS (
IN CONST CHAR8 *String,
IN UINTN MaxSize
);
/**
Returns the size of a Null-terminated Ascii string in bytes, including the
Null terminator.
This function returns the size of the Null-terminated Ascii string specified
by String in bytes, including the Null terminator.
@param String A pointer to a Null-terminated Ascii string.
@param MaxSize The maximum number of Destination Ascii
char, including the Null terminator.
@retval 0 If String is NULL.
@retval (sizeof (CHAR8) * (MaxSize + 1))
If there is no Null terminator in the first MaxSize characters of
String.
@return The size of the Null-terminated Ascii string in bytes, including the
Null terminator.
**/
UINTN
EFIAPI
AsciiStrnSizeS (
IN CONST CHAR8 *String,
IN UINTN MaxSize
);
/**
Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@param Source A pointer to a Null-terminated Ascii string.
@retval RETURN_SUCCESS String is copied.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrCpyS (
OUT CHAR8 *Destination,
IN UINTN DestMax,
IN CONST CHAR8 *Source
);
/**
Copies not more than Length successive char from the string pointed to by
Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@param Source A pointer to a Null-terminated Ascii string.
@param Length The maximum number of Ascii characters to copy.
@retval RETURN_SUCCESS String is copied.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
MIN(StrLen(Source), Length).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrnCpyS (
OUT CHAR8 *Destination,
IN UINTN DestMax,
IN CONST CHAR8 *Source,
IN UINTN Length
);
/**
Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@param Source A pointer to a Null-terminated Ascii string.
@retval RETURN_SUCCESS String is appended.
@retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than
StrLen(Destination).
@retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT
greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrCatS (
IN OUT CHAR8 *Destination,
IN UINTN DestMax,
IN CONST CHAR8 *Source
);
/**
Appends not more than Length successive char from the string pointed to by
Source to the end of the string pointed to by Destination. If no null char is
copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null.
This function is similar as strncat_s defined in C11.
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@param Source A pointer to a Null-terminated Ascii string.
@param Length The maximum number of Ascii characters to copy.
@retval RETURN_SUCCESS String is appended.
@retval RETURN_BAD_BUFFER_SIZE If DestMax is NOT greater than
StrLen(Destination).
@retval RETURN_BUFFER_TOO_SMALL If (DestMax - StrLen(Destination)) is NOT
greater than MIN(StrLen(Source), Length).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrnCatS (
IN OUT CHAR8 *Destination,
IN UINTN DestMax,
IN CONST CHAR8 *Source,
IN UINTN Length
);
/**
Convert a Null-terminated Ascii decimal string to a value of type UINTN.
This function outputs a value of type UINTN by interpreting the contents of
the Ascii string specified by String as a decimal number. The format of the
input Ascii string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before
[decimal digits]. The running zero in the beginning of [decimal digits] will
be ignored. Then, the function stops at the first character that is a not a
valid decimal character or a Null-terminator, whichever one comes first.
If String has no valid decimal digits in the above format, then 0 is stored
at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINTN, then
MAX_UINTN is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
decimal digits right after the optional pad spaces, the value of String is
stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Ascii string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumAsciiStringLength is not zero,
and String contains more than
PcdMaximumAsciiStringLength Ascii
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINTN.
**/
RETURN_STATUS
EFIAPI
AsciiStrDecimalToUintnS (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT UINTN *Data
);
/**
Convert a Null-terminated Ascii decimal string to a value of type UINT64.
This function outputs a value of type UINT64 by interpreting the contents of
the Ascii string specified by String as a decimal number. The format of the
input Ascii string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before
[decimal digits]. The running zero in the beginning of [decimal digits] will
be ignored. Then, the function stops at the first character that is a not a
valid decimal character or a Null-terminator, whichever one comes first.
If String has no valid decimal digits in the above format, then 0 is stored
at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINT64, then
MAX_UINT64 is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
decimal digits right after the optional pad spaces, the value of String is
stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Ascii string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumAsciiStringLength is not zero,
and String contains more than
PcdMaximumAsciiStringLength Ascii
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINT64.
**/
RETURN_STATUS
EFIAPI
AsciiStrDecimalToUint64S (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT UINT64 *Data
);
/**
Convert a Null-terminated Ascii hexadecimal string to a value of type UINTN.
This function outputs a value of type UINTN by interpreting the contents of
the Ascii string specified by String as a hexadecimal number. The format of
the input Ascii string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If
"x" appears in the input string, it must be prefixed with at least one 0. The
function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digits]. The running zero before [x] or
[hexadecimal digits] will be ignored. Then, the decoding starts after [x] or
the first valid hexadecimal digit. Then, the function stops at the first
character that is a not a valid hexadecimal character or Null-terminator,
whichever on comes first.
If String has no valid hexadecimal digits in the above format, then 0 is
stored at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINTN, then
MAX_UINTN is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
hexadecimal digits right after the optional pad spaces, the value of String
is stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Ascii string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumAsciiStringLength is not zero,
and String contains more than
PcdMaximumAsciiStringLength Ascii
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINTN.
**/
RETURN_STATUS
EFIAPI
AsciiStrHexToUintnS (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT UINTN *Data
);
/**
Convert a Null-terminated Ascii hexadecimal string to a value of type UINT64.
This function outputs a value of type UINT64 by interpreting the contents of
the Ascii string specified by String as a hexadecimal number. The format of
the input Ascii string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If
"x" appears in the input string, it must be prefixed with at least one 0. The
function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digits]. The running zero before [x] or
[hexadecimal digits] will be ignored. Then, the decoding starts after [x] or
the first valid hexadecimal digit. Then, the function stops at the first
character that is a not a valid hexadecimal character or Null-terminator,
whichever on comes first.
If String has no valid hexadecimal digits in the above format, then 0 is
stored at the location pointed to by Data.
If the number represented by String exceeds the range defined by UINT64, then
MAX_UINT64 is stored at the location pointed to by Data.
If EndPointer is not NULL, a pointer to the character that stopped the scan
is stored at the location pointed to by EndPointer. If String has no valid
hexadecimal digits right after the optional pad spaces, the value of String
is stored at the location pointed to by EndPointer.
@param String Pointer to a Null-terminated Ascii string.
@param EndPointer Pointer to character that stops scan.
@param Data Pointer to the converted value.
@retval RETURN_SUCCESS Value is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If PcdMaximumAsciiStringLength is not zero,
and String contains more than
PcdMaximumAsciiStringLength Ascii
characters, not including the
Null-terminator.
@retval RETURN_UNSUPPORTED If the number represented by String exceeds
the range defined by UINT64.
**/
RETURN_STATUS
EFIAPI
AsciiStrHexToUint64S (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT UINT64 *Data
);
/**
Returns the length of a Null-terminated Unicode string.
This function returns the number of Unicode characters in the Null-terminated
Unicode string specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters not including the
Null-terminator, then ASSERT().
@param String Pointer to a Null-terminated Unicode string.
@return The length of String.
**/
UINTN
EFIAPI
StrLen (
IN CONST CHAR16 *String
);
/**
Returns the size of a Null-terminated Unicode string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated Unicode string
specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters not including the
Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@return The size of String.
**/
UINTN
EFIAPI
StrSize (
IN CONST CHAR16 *String
);
/**
Compares two Null-terminated Unicode strings, and returns the difference
between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched Unicode character in SecondString subtracted from the first
mismatched Unicode character in FirstString.
If FirstString is NULL, then ASSERT().
If FirstString is not aligned on a 16-bit boundary, then ASSERT().
If SecondString is NULL, then ASSERT().
If SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more
than PcdMaximumUnicodeStringLength Unicode characters not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param FirstString The pointer to a Null-terminated Unicode string.
@param SecondString The pointer to a Null-terminated Unicode string.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString
);
/**
Compares up to a specified length the contents of two Null-terminated Unicode strings,
and returns the difference between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. At most, Length Unicode
characters will be compared. If Length is 0, then 0 is returned. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched Unicode character in SecondString
subtracted from the first mismatched Unicode character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and FirstString is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If Length > 0 and SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Length is greater than
PcdMaximumUnicodeStringLength, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param FirstString The pointer to a Null-terminated Unicode string.
@param SecondString The pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to compare.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrnCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString,
IN UINTN Length
);
/**
Returns the first occurrence of a Null-terminated Unicode sub-string
in a Null-terminated Unicode string.
This function scans the contents of the Null-terminated Unicode string
specified by String and returns the first occurrence of SearchString.
If SearchString is not found in String, then NULL is returned. If
the length of SearchString is zero, then String is returned.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If SearchString is NULL, then ASSERT().
If SearchString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SearchString
or String contains more than PcdMaximumUnicodeStringLength Unicode
characters, not including the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@param SearchString The pointer to a Null-terminated Unicode string to search for.
@retval NULL If the SearchString does not appear in String.
@return others If there is a match.
**/
CHAR16 *
EFIAPI
StrStr (
IN CONST CHAR16 *String,
IN CONST CHAR16 *SearchString
);
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters not including
the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrDecimalToUintn (
IN CONST CHAR16 *String
);
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters not including
the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrDecimalToUint64 (
IN CONST CHAR16 *String
);
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character
that is a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrHexToUintn (
IN CONST CHAR16 *String
);
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character that is
a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrHexToUint64 (
IN CONST CHAR16 *String
);
/**
Convert a Null-terminated Unicode string to IPv6 address and prefix length.
This function outputs a value of type IPv6_ADDRESS and may output a value
of type UINT8 by interpreting the contents of the Unicode string specified
by String. The format of the input Unicode string String is as follows:
X:X:X:X:X:X:X:X[/P]
X contains one to four hexadecimal digit characters in the range [0-9], [a-f] and
[A-F]. X is converted to a value of type UINT16, whose low byte is stored in low
memory address and high byte is stored in high memory address. P contains decimal
digit characters in the range [0-9]. The running zero in the beginning of P will
be ignored. /P is optional.
When /P is not in the String, the function stops at the first character that is
not a valid hexadecimal digit character after eight X's are converted.
When /P is in the String, the function stops at the first character that is not
a valid decimal digit character after P is converted.
"::" can be used to compress one or more groups of X when X contains only 0.
The "::" can only appear once in the String.
If String is not aligned in a 16-bit boundary, then ASSERT().
If EndPointer is not NULL and Address is translated from String, a pointer
to the character that stopped the scan is stored at the location pointed to
by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Address Pointer to the converted IPv6 address.
@param PrefixLength Pointer to the converted IPv6 address prefix
length. MAX_UINT8 is returned when /P is
not in the String.
@retval RETURN_SUCCESS Address is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If X contains more than four hexadecimal
digit characters.
If String contains "::" and number of X
is not less than 8.
If P starts with character that is not a
valid decimal digit character.
If the decimal number converted from P
exceeds 128.
**/
RETURN_STATUS
EFIAPI
StrToIpv6Address (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT IPv6_ADDRESS *Address,
OUT UINT8 *PrefixLength OPTIONAL
);
/**
Convert a Null-terminated Unicode string to IPv4 address and prefix length.
This function outputs a value of type IPv4_ADDRESS and may output a value
of type UINT8 by interpreting the contents of the Unicode string specified
by String. The format of the input Unicode string String is as follows:
D.D.D.D[/P]
D and P are decimal digit characters in the range [0-9]. The running zero in
the beginning of D and P will be ignored. /P is optional.
When /P is not in the String, the function stops at the first character that is
not a valid decimal digit character after four D's are converted.
When /P is in the String, the function stops at the first character that is not
a valid decimal digit character after P is converted.
If String is not aligned in a 16-bit boundary, then ASSERT().
If EndPointer is not NULL and Address is translated from String, a pointer
to the character that stopped the scan is stored at the location pointed to
by EndPointer.
@param String Pointer to a Null-terminated Unicode string.
@param EndPointer Pointer to character that stops scan.
@param Address Pointer to the converted IPv4 address.
@param PrefixLength Pointer to the converted IPv4 address prefix
length. MAX_UINT8 is returned when /P is
not in the String.
@retval RETURN_SUCCESS Address is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If String is not in the correct format.
If any decimal number converted from D
exceeds 255.
If the decimal number converted from P
exceeds 32.
**/
RETURN_STATUS
EFIAPI
StrToIpv4Address (
IN CONST CHAR16 *String,
OUT CHAR16 **EndPointer OPTIONAL,
OUT IPv4_ADDRESS *Address,
OUT UINT8 *PrefixLength OPTIONAL
);
#define GUID_STRING_LENGTH 36
/**
Convert a Null-terminated Unicode GUID string to a value of type
EFI_GUID.
This function outputs a GUID value by interpreting the contents of
the Unicode string specified by String. The format of the input
Unicode string String consists of 36 characters, as follows:
aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
The pairs aa - pp are two characters in the range [0-9], [a-f] and
[A-F], with each pair representing a single byte hexadecimal value.
The mapping between String and the EFI_GUID structure is as follows:
aa Data1[24:31]
bb Data1[16:23]
cc Data1[8:15]
dd Data1[0:7]
ee Data2[8:15]
ff Data2[0:7]
gg Data3[8:15]
hh Data3[0:7]
ii Data4[0:7]
jj Data4[8:15]
kk Data4[16:23]
ll Data4[24:31]
mm Data4[32:39]
nn Data4[40:47]
oo Data4[48:55]
pp Data4[56:63]
If String is not aligned in a 16-bit boundary, then ASSERT().
@param String Pointer to a Null-terminated Unicode string.
@param Guid Pointer to the converted GUID.
@retval RETURN_SUCCESS Guid is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If String is not as the above format.
**/
RETURN_STATUS
EFIAPI
StrToGuid (
IN CONST CHAR16 *String,
OUT GUID *Guid
);
/**
Convert a Null-terminated Unicode hexadecimal string to a byte array.
This function outputs a byte array by interpreting the contents of
the Unicode string specified by String in hexadecimal format. The format of
the input Unicode string String is:
[XX]*
X is a hexadecimal digit character in the range [0-9], [a-f] and [A-F].
The function decodes every two hexadecimal digit characters as one byte. The
decoding stops after Length of characters and outputs Buffer containing
(Length / 2) bytes.
If String is not aligned in a 16-bit boundary, then ASSERT().
@param String Pointer to a Null-terminated Unicode string.
@param Length The number of Unicode characters to decode.
@param Buffer Pointer to the converted bytes array.
@param MaxBufferSize The maximum size of Buffer.
@retval RETURN_SUCCESS Buffer is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If Length is not multiple of 2.
If PcdMaximumUnicodeStringLength is not zero,
and Length is greater than
PcdMaximumUnicodeStringLength.
@retval RETURN_UNSUPPORTED If Length of characters from String contain
a character that is not valid hexadecimal
digit characters, or a Null-terminator.
@retval RETURN_BUFFER_TOO_SMALL If MaxBufferSize is less than (Length / 2).
**/
RETURN_STATUS
EFIAPI
StrHexToBytes (
IN CONST CHAR16 *String,
IN UINTN Length,
OUT UINT8 *Buffer,
IN UINTN MaxBufferSize
);
/**
Convert a Null-terminated Unicode string to a Null-terminated
ASCII string.
This function is similar to AsciiStrCpyS.
This function converts the content of the Unicode string Source
to the ASCII string Destination by copying the lower 8 bits of
each Unicode character. The function terminates the ASCII string
Destination by appending a Null-terminator character at the end.
The caller is responsible to make sure Destination points to a buffer with size
equal or greater than ((StrLen (Source) + 1) * sizeof (CHAR8)) in bytes.
If any Unicode characters in Source contain non-zero value in
the upper 8 bits, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Source The pointer to a Null-terminated Unicode string.
@param Destination The pointer to a Null-terminated ASCII string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@retval RETURN_SUCCESS String is converted.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
UnicodeStrToAsciiStrS (
IN CONST CHAR16 *Source,
OUT CHAR8 *Destination,
IN UINTN DestMax
);
/**
Convert not more than Length successive characters from a Null-terminated
Unicode string to a Null-terminated Ascii string. If no null char is copied
from Source, then Destination[Length] is always set to null.
This function converts not more than Length successive characters from the
Unicode string Source to the Ascii string Destination by copying the lower 8
bits of each Unicode character. The function terminates the Ascii string
Destination by appending a Null-terminator character at the end.
The caller is responsible to make sure Destination points to a buffer with size
equal or greater than ((StrLen (Source) + 1) * sizeof (CHAR8)) in bytes.
If any Unicode characters in Source contain non-zero value in the upper 8
bits, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Source The pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to
convert.
@param Destination The pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii
char, including terminating null char.
@param DestinationLength The number of Unicode characters converted.
@retval RETURN_SUCCESS String is converted.
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If DestinationLength is NULL.
If PcdMaximumAsciiStringLength is not zero,
and Length or DestMax is greater than
PcdMaximumAsciiStringLength.
If PcdMaximumUnicodeStringLength is not
zero, and Length or DestMax is greater than
PcdMaximumUnicodeStringLength.
If DestMax is 0.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
MIN(StrLen(Source), Length).
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
UnicodeStrnToAsciiStrS (
IN CONST CHAR16 *Source,
IN UINTN Length,
OUT CHAR8 *Destination,
IN UINTN DestMax,
OUT UINTN *DestinationLength
);
/**
Returns the length of a Null-terminated ASCII string.
This function returns the number of ASCII characters in the Null-terminated
ASCII string specified by String.
If Length > 0 and Destination is NULL, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@return The length of String.
**/
UINTN
EFIAPI
AsciiStrLen (
IN CONST CHAR8 *String
);
/**
Returns the size of a Null-terminated ASCII string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated ASCII string
specified by String.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@return The size of String.
**/
UINTN
EFIAPI
AsciiStrSize (
IN CONST CHAR8 *String
);
/**
Compares two Null-terminated ASCII strings, and returns the difference
between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched ASCII character in SecondString subtracted from the first
mismatched ASCII character in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters not including the
Null-terminator, then ASSERT().
@param FirstString The pointer to a Null-terminated ASCII string.
@param SecondString The pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
);
/**
Performs a case insensitive comparison of two Null-terminated ASCII strings,
and returns the difference between the first mismatched ASCII characters.
This function performs a case insensitive comparison of the Null-terminated
ASCII string FirstString to the Null-terminated ASCII string SecondString. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched lower case ASCII character in
SecondString subtracted from the first mismatched lower case ASCII character
in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters not including the
Null-terminator, then ASSERT().
@param FirstString The pointer to a Null-terminated ASCII string.
@param SecondString The pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString using case insensitive
comparisons.
@retval !=0 FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
AsciiStriCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
);
/**
Compares two Null-terminated ASCII strings with maximum lengths, and returns
the difference between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. At most, Length ASCII characters
will be compared. If Length is 0, then 0 is returned. If FirstString is
identical to SecondString, then 0 is returned. Otherwise, the value returned
is the first mismatched ASCII character in SecondString subtracted from the
first mismatched ASCII character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Length is greater than
PcdMaximumAsciiStringLength, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SecondString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param FirstString The pointer to a Null-terminated ASCII string.
@param SecondString The pointer to a Null-terminated ASCII string.
@param Length The maximum number of ASCII characters for compare.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrnCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString,
IN UINTN Length
);
/**
Returns the first occurrence of a Null-terminated ASCII sub-string
in a Null-terminated ASCII string.
This function scans the contents of the ASCII string specified by String
and returns the first occurrence of SearchString. If SearchString is not
found in String, then NULL is returned. If the length of SearchString is zero,
then String is returned.
If String is NULL, then ASSERT().
If SearchString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SearchString or
String contains more than PcdMaximumAsciiStringLength Unicode characters
not including the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@param SearchString The pointer to a Null-terminated ASCII string to search for.
@retval NULL If the SearchString does not appear in String.
@retval others If there is a match return the first occurrence of SearchingString.
If the length of SearchString is zero,return String.
**/
CHAR8 *
EFIAPI
AsciiStrStr (
IN CONST CHAR8 *String,
IN CONST CHAR8 *SearchString
);
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINTN.
This function returns a value of type UINTN by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@retval The value translated from String.
**/
UINTN
EFIAPI
AsciiStrDecimalToUintn (
IN CONST CHAR8 *String
);
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrDecimalToUint64 (
IN CONST CHAR8 *String
);
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINTN,
then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINTN
EFIAPI
AsciiStrHexToUintn (
IN CONST CHAR8 *String
);
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINT64,
then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String The pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrHexToUint64 (
IN CONST CHAR8 *String
);
/**
Convert a Null-terminated ASCII string to IPv6 address and prefix length.
This function outputs a value of type IPv6_ADDRESS and may output a value
of type UINT8 by interpreting the contents of the ASCII string specified
by String. The format of the input ASCII string String is as follows:
X:X:X:X:X:X:X:X[/P]
X contains one to four hexadecimal digit characters in the range [0-9], [a-f] and
[A-F]. X is converted to a value of type UINT16, whose low byte is stored in low
memory address and high byte is stored in high memory address. P contains decimal
digit characters in the range [0-9]. The running zero in the beginning of P will
be ignored. /P is optional.
When /P is not in the String, the function stops at the first character that is
not a valid hexadecimal digit character after eight X's are converted.
When /P is in the String, the function stops at the first character that is not
a valid decimal digit character after P is converted.
"::" can be used to compress one or more groups of X when X contains only 0.
The "::" can only appear once in the String.
If EndPointer is not NULL and Address is translated from String, a pointer
to the character that stopped the scan is stored at the location pointed to
by EndPointer.
@param String Pointer to a Null-terminated ASCII string.
@param EndPointer Pointer to character that stops scan.
@param Address Pointer to the converted IPv6 address.
@param PrefixLength Pointer to the converted IPv6 address prefix
length. MAX_UINT8 is returned when /P is
not in the String.
@retval RETURN_SUCCESS Address is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If X contains more than four hexadecimal
digit characters.
If String contains "::" and number of X
is not less than 8.
If P starts with character that is not a
valid decimal digit character.
If the decimal number converted from P
exceeds 128.
**/
RETURN_STATUS
EFIAPI
AsciiStrToIpv6Address (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT IPv6_ADDRESS *Address,
OUT UINT8 *PrefixLength OPTIONAL
);
/**
Convert a Null-terminated ASCII string to IPv4 address and prefix length.
This function outputs a value of type IPv4_ADDRESS and may output a value
of type UINT8 by interpreting the contents of the ASCII string specified
by String. The format of the input ASCII string String is as follows:
D.D.D.D[/P]
D and P are decimal digit characters in the range [0-9]. The running zero in
the beginning of D and P will be ignored. /P is optional.
When /P is not in the String, the function stops at the first character that is
not a valid decimal digit character after four D's are converted.
When /P is in the String, the function stops at the first character that is not
a valid decimal digit character after P is converted.
If EndPointer is not NULL and Address is translated from String, a pointer
to the character that stopped the scan is stored at the location pointed to
by EndPointer.
@param String Pointer to a Null-terminated ASCII string.
@param EndPointer Pointer to character that stops scan.
@param Address Pointer to the converted IPv4 address.
@param PrefixLength Pointer to the converted IPv4 address prefix
length. MAX_UINT8 is returned when /P is
not in the String.
@retval RETURN_SUCCESS Address is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If String is not in the correct format.
If any decimal number converted from D
exceeds 255.
If the decimal number converted from P
exceeds 32.
**/
RETURN_STATUS
EFIAPI
AsciiStrToIpv4Address (
IN CONST CHAR8 *String,
OUT CHAR8 **EndPointer OPTIONAL,
OUT IPv4_ADDRESS *Address,
OUT UINT8 *PrefixLength OPTIONAL
);
/**
Convert a Null-terminated ASCII GUID string to a value of type
EFI_GUID.
This function outputs a GUID value by interpreting the contents of
the ASCII string specified by String. The format of the input
ASCII string String consists of 36 characters, as follows:
aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
The pairs aa - pp are two characters in the range [0-9], [a-f] and
[A-F], with each pair representing a single byte hexadecimal value.
The mapping between String and the EFI_GUID structure is as follows:
aa Data1[24:31]
bb Data1[16:23]
cc Data1[8:15]
dd Data1[0:7]
ee Data2[8:15]
ff Data2[0:7]
gg Data3[8:15]
hh Data3[0:7]
ii Data4[0:7]
jj Data4[8:15]
kk Data4[16:23]
ll Data4[24:31]
mm Data4[32:39]
nn Data4[40:47]
oo Data4[48:55]
pp Data4[56:63]
@param String Pointer to a Null-terminated ASCII string.
@param Guid Pointer to the converted GUID.
@retval RETURN_SUCCESS Guid is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
@retval RETURN_UNSUPPORTED If String is not as the above format.
**/
RETURN_STATUS
EFIAPI
AsciiStrToGuid (
IN CONST CHAR8 *String,
OUT GUID *Guid
);
/**
Convert a Null-terminated ASCII hexadecimal string to a byte array.
This function outputs a byte array by interpreting the contents of
the ASCII string specified by String in hexadecimal format. The format of
the input ASCII string String is:
[XX]*
X is a hexadecimal digit character in the range [0-9], [a-f] and [A-F].
The function decodes every two hexadecimal digit characters as one byte. The
decoding stops after Length of characters and outputs Buffer containing
(Length / 2) bytes.
@param String Pointer to a Null-terminated ASCII string.
@param Length The number of ASCII characters to decode.
@param Buffer Pointer to the converted bytes array.
@param MaxBufferSize The maximum size of Buffer.
@retval RETURN_SUCCESS Buffer is translated from String.
@retval RETURN_INVALID_PARAMETER If String is NULL.
If Data is NULL.
If Length is not multiple of 2.
If PcdMaximumAsciiStringLength is not zero,
and Length is greater than
PcdMaximumAsciiStringLength.
@retval RETURN_UNSUPPORTED If Length of characters from String contain
a character that is not valid hexadecimal
digit characters, or a Null-terminator.
@retval RETURN_BUFFER_TOO_SMALL If MaxBufferSize is less than (Length / 2).
**/
RETURN_STATUS
EFIAPI
AsciiStrHexToBytes (
IN CONST CHAR8 *String,
IN UINTN Length,
OUT UINT8 *Buffer,
IN UINTN MaxBufferSize
);
/**
Convert one Null-terminated ASCII string to a Null-terminated
Unicode string.
This function is similar to StrCpyS.
This function converts the contents of the ASCII string Source to the Unicode
string Destination. The function terminates the Unicode string Destination by
appending a Null-terminator character at the end.
The caller is responsible to make sure Destination points to a buffer with size
equal or greater than ((AsciiStrLen (Source) + 1) * sizeof (CHAR16)) in bytes.
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then the Destination is unmodified.
@param Source The pointer to a Null-terminated ASCII string.
@param Destination The pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode
char, including terminating null char.
@retval RETURN_SUCCESS String is converted.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than StrLen(Source).
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If PcdMaximumUnicodeStringLength is not zero,
and DestMax is greater than
PcdMaximumUnicodeStringLength.
If PcdMaximumAsciiStringLength is not zero,
and DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrToUnicodeStrS (
IN CONST CHAR8 *Source,
OUT CHAR16 *Destination,
IN UINTN DestMax
);
/**
Convert not more than Length successive characters from a Null-terminated
Ascii string to a Null-terminated Unicode string. If no null char is copied
from Source, then Destination[Length] is always set to null.
This function converts not more than Length successive characters from the
Ascii string Source to the Unicode string Destination. The function
terminates the Unicode string Destination by appending a Null-terminator
character at the end.
The caller is responsible to make sure Destination points to a buffer with
size not smaller than
((MIN(AsciiStrLen(Source), Length) + 1) * sizeof (CHAR8)) in bytes.
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If an error is returned, then Destination and DestinationLength are
unmodified.
@param Source The pointer to a Null-terminated Ascii string.
@param Length The maximum number of Ascii characters to convert.
@param Destination The pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode char,
including terminating null char.
@param DestinationLength The number of Ascii characters converted.
@retval RETURN_SUCCESS String is converted.
@retval RETURN_INVALID_PARAMETER If Destination is NULL.
If Source is NULL.
If DestinationLength is NULL.
If PcdMaximumUnicodeStringLength is not
zero, and Length or DestMax is greater than
PcdMaximumUnicodeStringLength.
If PcdMaximumAsciiStringLength is not zero,
and Length or DestMax is greater than
PcdMaximumAsciiStringLength.
If DestMax is 0.
@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
MIN(AsciiStrLen(Source), Length).
@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
**/
RETURN_STATUS
EFIAPI
AsciiStrnToUnicodeStrS (
IN CONST CHAR8 *Source,
IN UINTN Length,
OUT CHAR16 *Destination,
IN UINTN DestMax,
OUT UINTN *DestinationLength
);
/**
Convert a Unicode character to upper case only if
it maps to a valid small-case ASCII character.
This internal function only deal with Unicode character
which maps to a valid small-case ASCII character, i.e.
L'a' to L'z'. For other Unicode character, the input character
is returned directly.
@param Char The character to convert.
@retval LowerCharacter If the Char is with range L'a' to L'z'.
@retval Unchanged Otherwise.
**/
CHAR16
EFIAPI
CharToUpper (
IN CHAR16 Char
);
/**
Converts a lowercase Ascii character to upper one.
If Chr is lowercase Ascii character, then converts it to upper one.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Chr one Ascii character
@return The uppercase value of Ascii character
**/
CHAR8
EFIAPI
AsciiCharToUpper (
IN CHAR8 Chr
);
/**
Convert binary data to a Base64 encoded ascii string based on RFC4648.
Produce a Null-terminated Ascii string in the output buffer specified by Destination and DestinationSize.
The Ascii string is produced by converting the data string specified by Source and SourceLength.
@param Source Input UINT8 data
@param SourceLength Number of UINT8 bytes of data
@param Destination Pointer to output string buffer
@param DestinationSize Size of ascii buffer. Set to 0 to get the size needed.
Caller is responsible for passing in buffer of DestinationSize
@retval RETURN_SUCCESS When ascii buffer is filled in.
@retval RETURN_INVALID_PARAMETER If Source is NULL or DestinationSize is NULL.
@retval RETURN_INVALID_PARAMETER If SourceLength or DestinationSize is bigger than (MAX_ADDRESS - (UINTN)Destination).
@retval RETURN_BUFFER_TOO_SMALL If SourceLength is 0 and DestinationSize is <1.
@retval RETURN_BUFFER_TOO_SMALL If Destination is NULL or DestinationSize is smaller than required buffersize.
**/
RETURN_STATUS
EFIAPI
Base64Encode (
IN CONST UINT8 *Source,
IN UINTN SourceLength,
OUT CHAR8 *Destination OPTIONAL,
IN OUT UINTN *DestinationSize
);
/**
Decode Base64 ASCII encoded data to 8-bit binary representation, based on
RFC4648.
Decoding occurs according to "Table 1: The Base 64 Alphabet" in RFC4648.
Whitespace is ignored at all positions:
- 0x09 ('\t') horizontal tab
- 0x0A ('\n') new line
- 0x0B ('\v') vertical tab
- 0x0C ('\f') form feed
- 0x0D ('\r') carriage return
- 0x20 (' ') space
The minimum amount of required padding (with ASCII 0x3D, '=') is tolerated
and enforced at the end of the Base64 ASCII encoded data, and only there.
Other characters outside of the encoding alphabet cause the function to
reject the Base64 ASCII encoded data.
@param[in] Source Array of CHAR8 elements containing the Base64
ASCII encoding. May be NULL if SourceSize is
zero.
@param[in] SourceSize Number of CHAR8 elements in Source.
@param[out] Destination Array of UINT8 elements receiving the decoded
8-bit binary representation. Allocated by the
caller. May be NULL if DestinationSize is
zero on input. If NULL, decoding is
performed, but the 8-bit binary
representation is not stored. If non-NULL and
the function returns an error, the contents
of Destination are indeterminate.
@param[in,out] DestinationSize On input, the number of UINT8 elements that
the caller allocated for Destination. On
output, if the function returns
RETURN_SUCCESS or RETURN_BUFFER_TOO_SMALL,
the number of UINT8 elements that are
required for decoding the Base64 ASCII
representation. If the function returns a
value different from both RETURN_SUCCESS and
RETURN_BUFFER_TOO_SMALL, then DestinationSize
is indeterminate on output.
@retval RETURN_SUCCESS SourceSize CHAR8 elements at Source have
been decoded to on-output DestinationSize
UINT8 elements at Destination. Note that
RETURN_SUCCESS covers the case when
DestinationSize is zero on input, and
Source decodes to zero bytes (due to
containing at most ignored whitespace).
@retval RETURN_BUFFER_TOO_SMALL The input value of DestinationSize is not
large enough for decoding SourceSize CHAR8
elements at Source. The required number of
UINT8 elements has been stored to
DestinationSize.
@retval RETURN_INVALID_PARAMETER DestinationSize is NULL.
@retval RETURN_INVALID_PARAMETER Source is NULL, but SourceSize is not zero.
@retval RETURN_INVALID_PARAMETER Destination is NULL, but DestinationSize is
not zero on input.
@retval RETURN_INVALID_PARAMETER Source is non-NULL, and (Source +
SourceSize) would wrap around MAX_ADDRESS.
@retval RETURN_INVALID_PARAMETER Destination is non-NULL, and (Destination +
DestinationSize) would wrap around
MAX_ADDRESS, as specified on input.
@retval RETURN_INVALID_PARAMETER None of Source and Destination are NULL,
and CHAR8[SourceSize] at Source overlaps
UINT8[DestinationSize] at Destination, as
specified on input.
@retval RETURN_INVALID_PARAMETER Invalid CHAR8 element encountered in
Source.
**/
RETURN_STATUS
EFIAPI
Base64Decode (
IN CONST CHAR8 *Source OPTIONAL,
IN UINTN SourceSize,
OUT UINT8 *Destination OPTIONAL,
IN OUT UINTN *DestinationSize
);
/**
Converts an 8-bit value to an 8-bit BCD value.
Converts the 8-bit value specified by Value to BCD. The BCD value is
returned.
If Value >= 100, then ASSERT().
@param Value The 8-bit value to convert to BCD. Range 0..99.
@return The BCD value.
**/
UINT8
EFIAPI
DecimalToBcd8 (
IN UINT8 Value
);
/**
Converts an 8-bit BCD value to an 8-bit value.
Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit
value is returned.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Value The 8-bit BCD value to convert to an 8-bit value.
@return The 8-bit value is returned.
**/
UINT8
EFIAPI
BcdToDecimal8 (
IN UINT8 Value
);
//
// File Path Manipulation Functions
//
/**
Removes the last directory or file entry in a path.
@param[in, out] Path The pointer to the path to modify.
@retval FALSE Nothing was found to remove.
@retval TRUE A directory or file was removed.
**/
BOOLEAN
EFIAPI
PathRemoveLastItem (
IN OUT CHAR16 *Path
);
/**
Function to clean up paths.
- Single periods in the path are removed.
- Double periods in the path are removed along with a single parent directory.
- Forward slashes L'/' are converted to backward slashes L'\'.
This will be done inline and the existing buffer may be larger than required
upon completion.
@param[in] Path The pointer to the string containing the path.
@return Returns Path, otherwise returns NULL to indicate that an error has occurred.
**/
CHAR16 *
EFIAPI
PathCleanUpDirectories (
IN CHAR16 *Path
);
//
// Linked List Functions and Macros
//
/**
Initializes the head node of a doubly linked list that is declared as a
global variable in a module.
Initializes the forward and backward links of a new linked list. After
initializing a linked list with this macro, the other linked list functions
may be used to add and remove nodes from the linked list. This macro results
in smaller executables by initializing the linked list in the data section,
instead if calling the InitializeListHead() function to perform the
equivalent operation.
@param ListHead The head note of a list to initialize.
**/
#define INITIALIZE_LIST_HEAD_VARIABLE(ListHead) {&(ListHead), &(ListHead)}
/**
Iterates over each node in a doubly linked list using each node's forward link.
@param Entry A pointer to a list node used as a loop cursor during iteration
@param ListHead The head node of the doubly linked list
**/
#define BASE_LIST_FOR_EACH(Entry, ListHead) \
for(Entry = (ListHead)->ForwardLink; Entry != (ListHead); Entry = Entry->ForwardLink)
/**
Iterates over each node in a doubly linked list using each node's forward link
with safety against node removal.
This macro uses NextEntry to temporarily store the next list node so the node
pointed to by Entry may be deleted in the current loop iteration step and
iteration can continue from the node pointed to by NextEntry.
@param Entry A pointer to a list node used as a loop cursor during iteration
@param NextEntry A pointer to a list node used to temporarily store the next node
@param ListHead The head node of the doubly linked list
**/
#define BASE_LIST_FOR_EACH_SAFE(Entry, NextEntry, ListHead) \
for(Entry = (ListHead)->ForwardLink, NextEntry = Entry->ForwardLink;\
Entry != (ListHead); Entry = NextEntry, NextEntry = Entry->ForwardLink)
/**
Checks whether FirstEntry and SecondEntry are part of the same doubly-linked
list.
If FirstEntry is NULL, then ASSERT().
If FirstEntry->ForwardLink is NULL, then ASSERT().
If FirstEntry->BackLink is NULL, then ASSERT().
If SecondEntry is NULL, then ASSERT();
If PcdMaximumLinkedListLength is not zero, and List contains more than
PcdMaximumLinkedListLength nodes, then ASSERT().
@param FirstEntry A pointer to a node in a linked list.
@param SecondEntry A pointer to the node to locate.
@retval TRUE SecondEntry is in the same doubly-linked list as FirstEntry.
@retval FALSE SecondEntry isn't in the same doubly-linked list as FirstEntry,
or FirstEntry is invalid.
**/
BOOLEAN
EFIAPI
IsNodeInList (
IN CONST LIST_ENTRY *FirstEntry,
IN CONST LIST_ENTRY *SecondEntry
);
/**
Initializes the head node of a doubly linked list, and returns the pointer to
the head node of the doubly linked list.
Initializes the forward and backward links of a new linked list. After
initializing a linked list with this function, the other linked list
functions may be used to add and remove nodes from the linked list. It is up
to the caller of this function to allocate the memory for ListHead.
If ListHead is NULL, then ASSERT().
@param ListHead A pointer to the head node of a new doubly linked list.
@return ListHead
**/
LIST_ENTRY *
EFIAPI
InitializeListHead (
IN OUT LIST_ENTRY *ListHead
);
/**
Adds a node to the beginning of a doubly linked list, and returns the pointer
to the head node of the doubly linked list.
Adds the node Entry at the beginning of the doubly linked list denoted by
ListHead, and returns ListHead.
If ListHead is NULL, then ASSERT().
If Entry is NULL, then ASSERT().
If ListHead was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and prior to insertion the number
of nodes in ListHead, including the ListHead node, is greater than or
equal to PcdMaximumLinkedListLength, then ASSERT().
@param ListHead A pointer to the head node of a doubly linked list.
@param Entry A pointer to a node that is to be inserted at the beginning
of a doubly linked list.
@return ListHead
**/
LIST_ENTRY *
EFIAPI
InsertHeadList (
IN OUT LIST_ENTRY *ListHead,
IN OUT LIST_ENTRY *Entry
);
/**
Adds a node to the end of a doubly linked list, and returns the pointer to
the head node of the doubly linked list.
Adds the node Entry to the end of the doubly linked list denoted by ListHead,
and returns ListHead.
If ListHead is NULL, then ASSERT().
If Entry is NULL, then ASSERT().
If ListHead was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and prior to insertion the number
of nodes in ListHead, including the ListHead node, is greater than or
equal to PcdMaximumLinkedListLength, then ASSERT().
@param ListHead A pointer to the head node of a doubly linked list.
@param Entry A pointer to a node that is to be added at the end of the
doubly linked list.
@return ListHead
**/
LIST_ENTRY *
EFIAPI
InsertTailList (
IN OUT LIST_ENTRY *ListHead,
IN OUT LIST_ENTRY *Entry
);
/**
Retrieves the first node of a doubly linked list.
Returns the first node of a doubly linked list. List must have been
initialized with INTIALIZE_LIST_HEAD_VARIABLE() or InitializeListHead().
If List is empty, then List is returned.
If List is NULL, then ASSERT().
If List was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes
in List, including the List node, is greater than or equal to
PcdMaximumLinkedListLength, then ASSERT().
@param List A pointer to the head node of a doubly linked list.
@return The first node of a doubly linked list.
@retval List The list is empty.
**/
LIST_ENTRY *
EFIAPI
GetFirstNode (
IN CONST LIST_ENTRY *List
);
/**
Retrieves the next node of a doubly linked list.
Returns the node of a doubly linked list that follows Node.
List must have been initialized with INTIALIZE_LIST_HEAD_VARIABLE()
or InitializeListHead(). If List is empty, then List is returned.
If List is NULL, then ASSERT().
If Node is NULL, then ASSERT().
If List was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and List contains more than
PcdMaximumLinkedListLength nodes, then ASSERT().
If PcdVerifyNodeInList is TRUE and Node is not a node in List, then ASSERT().
@param List A pointer to the head node of a doubly linked list.
@param Node A pointer to a node in the doubly linked list.
@return The pointer to the next node if one exists. Otherwise List is returned.
**/
LIST_ENTRY *
EFIAPI
GetNextNode (
IN CONST LIST_ENTRY *List,
IN CONST LIST_ENTRY *Node
);
/**
Retrieves the previous node of a doubly linked list.
Returns the node of a doubly linked list that precedes Node.
List must have been initialized with INTIALIZE_LIST_HEAD_VARIABLE()
or InitializeListHead(). If List is empty, then List is returned.
If List is NULL, then ASSERT().
If Node is NULL, then ASSERT().
If List was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and List contains more than
PcdMaximumLinkedListLength nodes, then ASSERT().
If PcdVerifyNodeInList is TRUE and Node is not a node in List, then ASSERT().
@param List A pointer to the head node of a doubly linked list.
@param Node A pointer to a node in the doubly linked list.
@return The pointer to the previous node if one exists. Otherwise List is returned.
**/
LIST_ENTRY *
EFIAPI
GetPreviousNode (
IN CONST LIST_ENTRY *List,
IN CONST LIST_ENTRY *Node
);
/**
Checks to see if a doubly linked list is empty or not.
Checks to see if the doubly linked list is empty. If the linked list contains
zero nodes, this function returns TRUE. Otherwise, it returns FALSE.
If ListHead is NULL, then ASSERT().
If ListHead was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes
in List, including the List node, is greater than or equal to
PcdMaximumLinkedListLength, then ASSERT().
@param ListHead A pointer to the head node of a doubly linked list.
@retval TRUE The linked list is empty.
@retval FALSE The linked list is not empty.
**/
BOOLEAN
EFIAPI
IsListEmpty (
IN CONST LIST_ENTRY *ListHead
);
/**
Determines if a node in a doubly linked list is the head node of a the same
doubly linked list. This function is typically used to terminate a loop that
traverses all the nodes in a doubly linked list starting with the head node.
Returns TRUE if Node is equal to List. Returns FALSE if Node is one of the
nodes in the doubly linked list specified by List. List must have been
initialized with INTIALIZE_LIST_HEAD_VARIABLE() or InitializeListHead().
If List is NULL, then ASSERT().
If Node is NULL, then ASSERT().
If List was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or InitializeListHead(),
then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes
in List, including the List node, is greater than or equal to
PcdMaximumLinkedListLength, then ASSERT().
If PcdVerifyNodeInList is TRUE and Node is not a node in List the and Node is not equal
to List, then ASSERT().
@param List A pointer to the head node of a doubly linked list.
@param Node A pointer to a node in the doubly linked list.
@retval TRUE Node is the head of the doubly-linked list pointed by List.
@retval FALSE Node is not the head of the doubly-linked list pointed by List.
**/
BOOLEAN
EFIAPI
IsNull (
IN CONST LIST_ENTRY *List,
IN CONST LIST_ENTRY *Node
);
/**
Determines if a node the last node in a doubly linked list.
Returns TRUE if Node is the last node in the doubly linked list specified by
List. Otherwise, FALSE is returned. List must have been initialized with
INTIALIZE_LIST_HEAD_VARIABLE() or InitializeListHead().
If List is NULL, then ASSERT().
If Node is NULL, then ASSERT().
If List was not initialized with INTIALIZE_LIST_HEAD_VARIABLE() or
InitializeListHead(), then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes
in List, including the List node, is greater than or equal to
PcdMaximumLinkedListLength, then ASSERT().
If PcdVerifyNodeInList is TRUE and Node is not a node in List, then ASSERT().
@param List A pointer to the head node of a doubly linked list.
@param Node A pointer to a node in the doubly linked list.
@retval TRUE Node is the last node in the linked list.
@retval FALSE Node is not the last node in the linked list.
**/
BOOLEAN
EFIAPI
IsNodeAtEnd (
IN CONST LIST_ENTRY *List,
IN CONST LIST_ENTRY *Node
);
/**
Swaps the location of two nodes in a doubly linked list, and returns the
first node after the swap.
If FirstEntry is identical to SecondEntry, then SecondEntry is returned.
Otherwise, the location of the FirstEntry node is swapped with the location
of the SecondEntry node in a doubly linked list. SecondEntry must be in the
same double linked list as FirstEntry and that double linked list must have
been initialized with INTIALIZE_LIST_HEAD_VARIABLE() or InitializeListHead().
SecondEntry is returned after the nodes are swapped.
If FirstEntry is NULL, then ASSERT().
If SecondEntry is NULL, then ASSERT().
If PcdVerifyNodeInList is TRUE and SecondEntry and FirstEntry are not in the
same linked list, then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes in the
linked list containing the FirstEntry and SecondEntry nodes, including
the FirstEntry and SecondEntry nodes, is greater than or equal to
PcdMaximumLinkedListLength, then ASSERT().
@param FirstEntry A pointer to a node in a linked list.
@param SecondEntry A pointer to another node in the same linked list.
@return SecondEntry.
**/
LIST_ENTRY *
EFIAPI
SwapListEntries (
IN OUT LIST_ENTRY *FirstEntry,
IN OUT LIST_ENTRY *SecondEntry
);
/**
Removes a node from a doubly linked list, and returns the node that follows
the removed node.
Removes the node Entry from a doubly linked list. It is up to the caller of
this function to release the memory used by this node if that is required. On
exit, the node following Entry in the doubly linked list is returned. If
Entry is the only node in the linked list, then the head node of the linked
list is returned.
If Entry is NULL, then ASSERT().
If Entry is the head node of an empty list, then ASSERT().
If PcdMaximumLinkedListLength is not zero, and the number of nodes in the
linked list containing Entry, including the Entry node, is greater than
or equal to PcdMaximumLinkedListLength, then ASSERT().
@param Entry A pointer to a node in a linked list.
@return Entry.
**/
LIST_ENTRY *
EFIAPI
RemoveEntryList (
IN CONST LIST_ENTRY *Entry
);
//
// Math Services
//
/**
Prototype for comparison function for any two element types.
@param[in] Buffer1 The pointer to first buffer.
@param[in] Buffer2 The pointer to second buffer.
@retval 0 Buffer1 equal to Buffer2.
@return <0 Buffer1 is less than Buffer2.
@return >0 Buffer1 is greater than Buffer2.
**/
typedef
INTN
(EFIAPI *BASE_SORT_COMPARE)(
IN CONST VOID *Buffer1,
IN CONST VOID *Buffer2
);
/**
This function is identical to perform QuickSort,
except that is uses the pre-allocated buffer so the in place sorting does not need to
allocate and free buffers constantly.
Each element must be equal sized.
if BufferToSort is NULL, then ASSERT.
if CompareFunction is NULL, then ASSERT.
if BufferOneElement is NULL, then ASSERT.
if ElementSize is < 1, then ASSERT.
if Count is < 2 then perform no action.
@param[in, out] BufferToSort on call a Buffer of (possibly sorted) elements
on return a buffer of sorted elements
@param[in] Count the number of elements in the buffer to sort
@param[in] ElementSize Size of an element in bytes
@param[in] CompareFunction The function to call to perform the comparison
of any 2 elements
@param[out] BufferOneElement Caller provided buffer whose size equals to ElementSize.
It's used by QuickSort() for swapping in sorting.
**/
VOID
EFIAPI
QuickSort (
IN OUT VOID *BufferToSort,
IN CONST UINTN Count,
IN CONST UINTN ElementSize,
IN BASE_SORT_COMPARE CompareFunction,
OUT VOID *BufferOneElement
);
/**
Shifts a 64-bit integer left between 0 and 63 bits. The low bits are filled
with zeros. The shifted value is returned.
This function shifts the 64-bit value Operand to the left by Count bits. The
low Count bits are set to zero. The shifted value is returned.
If Count is greater than 63, then ASSERT().
@param Operand The 64-bit operand to shift left.
@param Count The number of bits to shift left.
@return Operand << Count.
**/
UINT64
EFIAPI
LShiftU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Shifts a 64-bit integer right between 0 and 63 bits. This high bits are
filled with zeros. The shifted value is returned.
This function shifts the 64-bit value Operand to the right by Count bits. The
high Count bits are set to zero. The shifted value is returned.
If Count is greater than 63, then ASSERT().
@param Operand The 64-bit operand to shift right.
@param Count The number of bits to shift right.
@return Operand >> Count
**/
UINT64
EFIAPI
RShiftU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Shifts a 64-bit integer right between 0 and 63 bits. The high bits are filled
with original integer's bit 63. The shifted value is returned.
This function shifts the 64-bit value Operand to the right by Count bits. The
high Count bits are set to bit 63 of Operand. The shifted value is returned.
If Count is greater than 63, then ASSERT().
@param Operand The 64-bit operand to shift right.
@param Count The number of bits to shift right.
@return Operand >> Count
**/
UINT64
EFIAPI
ARShiftU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Rotates a 32-bit integer left between 0 and 31 bits, filling the low bits
with the high bits that were rotated.
This function rotates the 32-bit value Operand to the left by Count bits. The
low Count bits are fill with the high Count bits of Operand. The rotated
value is returned.
If Count is greater than 31, then ASSERT().
@param Operand The 32-bit operand to rotate left.
@param Count The number of bits to rotate left.
@return Operand << Count
**/
UINT32
EFIAPI
LRotU32 (
IN UINT32 Operand,
IN UINTN Count
);
/**
Rotates a 32-bit integer right between 0 and 31 bits, filling the high bits
with the low bits that were rotated.
This function rotates the 32-bit value Operand to the right by Count bits.
The high Count bits are fill with the low Count bits of Operand. The rotated
value is returned.
If Count is greater than 31, then ASSERT().
@param Operand The 32-bit operand to rotate right.
@param Count The number of bits to rotate right.
@return Operand >> Count
**/
UINT32
EFIAPI
RRotU32 (
IN UINT32 Operand,
IN UINTN Count
);
/**
Rotates a 64-bit integer left between 0 and 63 bits, filling the low bits
with the high bits that were rotated.
This function rotates the 64-bit value Operand to the left by Count bits. The
low Count bits are fill with the high Count bits of Operand. The rotated
value is returned.
If Count is greater than 63, then ASSERT().
@param Operand The 64-bit operand to rotate left.
@param Count The number of bits to rotate left.
@return Operand << Count
**/
UINT64
EFIAPI
LRotU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Rotates a 64-bit integer right between 0 and 63 bits, filling the high bits
with the high low bits that were rotated.
This function rotates the 64-bit value Operand to the right by Count bits.
The high Count bits are fill with the low Count bits of Operand. The rotated
value is returned.
If Count is greater than 63, then ASSERT().
@param Operand The 64-bit operand to rotate right.
@param Count The number of bits to rotate right.
@return Operand >> Count
**/
UINT64
EFIAPI
RRotU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Returns the bit position of the lowest bit set in a 32-bit value.
This function computes the bit position of the lowest bit set in the 32-bit
value specified by Operand. If Operand is zero, then -1 is returned.
Otherwise, a value between 0 and 31 is returned.
@param Operand The 32-bit operand to evaluate.
@retval 0..31 The lowest bit set in Operand was found.
@retval -1 Operand is zero.
**/
INTN
EFIAPI
LowBitSet32 (
IN UINT32 Operand
);
/**
Returns the bit position of the lowest bit set in a 64-bit value.
This function computes the bit position of the lowest bit set in the 64-bit
value specified by Operand. If Operand is zero, then -1 is returned.
Otherwise, a value between 0 and 63 is returned.
@param Operand The 64-bit operand to evaluate.
@retval 0..63 The lowest bit set in Operand was found.
@retval -1 Operand is zero.
**/
INTN
EFIAPI
LowBitSet64 (
IN UINT64 Operand
);
/**
Returns the bit position of the highest bit set in a 32-bit value. Equivalent
to log2(x).
This function computes the bit position of the highest bit set in the 32-bit
value specified by Operand. If Operand is zero, then -1 is returned.
Otherwise, a value between 0 and 31 is returned.
@param Operand The 32-bit operand to evaluate.
@retval 0..31 Position of the highest bit set in Operand if found.
@retval -1 Operand is zero.
**/
INTN
EFIAPI
HighBitSet32 (
IN UINT32 Operand
);
/**
Returns the bit position of the highest bit set in a 64-bit value. Equivalent
to log2(x).
This function computes the bit position of the highest bit set in the 64-bit
value specified by Operand. If Operand is zero, then -1 is returned.
Otherwise, a value between 0 and 63 is returned.
@param Operand The 64-bit operand to evaluate.
@retval 0..63 Position of the highest bit set in Operand if found.
@retval -1 Operand is zero.
**/
INTN
EFIAPI
HighBitSet64 (
IN UINT64 Operand
);
/**
Returns the value of the highest bit set in a 32-bit value. Equivalent to
1 << log2(x).
This function computes the value of the highest bit set in the 32-bit value
specified by Operand. If Operand is zero, then zero is returned.
@param Operand The 32-bit operand to evaluate.
@return 1 << HighBitSet32(Operand)
@retval 0 Operand is zero.
**/
UINT32
EFIAPI
GetPowerOfTwo32 (
IN UINT32 Operand
);
/**
Returns the value of the highest bit set in a 64-bit value. Equivalent to
1 << log2(x).
This function computes the value of the highest bit set in the 64-bit value
specified by Operand. If Operand is zero, then zero is returned.
@param Operand The 64-bit operand to evaluate.
@return 1 << HighBitSet64(Operand)
@retval 0 Operand is zero.
**/
UINT64
EFIAPI
GetPowerOfTwo64 (
IN UINT64 Operand
);
/**
Switches the endianness of a 16-bit integer.
This function swaps the bytes in a 16-bit unsigned value to switch the value
from little endian to big endian or vice versa. The byte swapped value is
returned.
@param Value A 16-bit unsigned value.
@return The byte swapped Value.
**/
UINT16
EFIAPI
SwapBytes16 (
IN UINT16 Value
);
/**
Switches the endianness of a 32-bit integer.
This function swaps the bytes in a 32-bit unsigned value to switch the value
from little endian to big endian or vice versa. The byte swapped value is
returned.
@param Value A 32-bit unsigned value.
@return The byte swapped Value.
**/
UINT32
EFIAPI
SwapBytes32 (
IN UINT32 Value
);
/**
Switches the endianness of a 64-bit integer.
This function swaps the bytes in a 64-bit unsigned value to switch the value
from little endian to big endian or vice versa. The byte swapped value is
returned.
@param Value A 64-bit unsigned value.
@return The byte swapped Value.
**/
UINT64
EFIAPI
SwapBytes64 (
IN UINT64 Value
);
/**
Multiples a 64-bit unsigned integer by a 32-bit unsigned integer and
generates a 64-bit unsigned result.
This function multiples the 64-bit unsigned value Multiplicand by the 32-bit
unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
bit unsigned result is returned.
@param Multiplicand A 64-bit unsigned value.
@param Multiplier A 32-bit unsigned value.
@return Multiplicand * Multiplier
**/
UINT64
EFIAPI
MultU64x32 (
IN UINT64 Multiplicand,
IN UINT32 Multiplier
);
/**
Multiples a 64-bit unsigned integer by a 64-bit unsigned integer and
generates a 64-bit unsigned result.
This function multiples the 64-bit unsigned value Multiplicand by the 64-bit
unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
bit unsigned result is returned.
@param Multiplicand A 64-bit unsigned value.
@param Multiplier A 64-bit unsigned value.
@return Multiplicand * Multiplier.
**/
UINT64
EFIAPI
MultU64x64 (
IN UINT64 Multiplicand,
IN UINT64 Multiplier
);
/**
Multiples a 64-bit signed integer by a 64-bit signed integer and generates a
64-bit signed result.
This function multiples the 64-bit signed value Multiplicand by the 64-bit
signed value Multiplier and generates a 64-bit signed result. This 64-bit
signed result is returned.
@param Multiplicand A 64-bit signed value.
@param Multiplier A 64-bit signed value.
@return Multiplicand * Multiplier
**/
INT64
EFIAPI
MultS64x64 (
IN INT64 Multiplicand,
IN INT64 Multiplier
);
/**
Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
a 64-bit unsigned result.
This function divides the 64-bit unsigned value Dividend by the 32-bit
unsigned value Divisor and generates a 64-bit unsigned quotient. This
function returns the 64-bit unsigned quotient.
If Divisor is 0, then ASSERT().
@param Dividend A 64-bit unsigned value.
@param Divisor A 32-bit unsigned value.
@return Dividend / Divisor.
**/
UINT64
EFIAPI
DivU64x32 (
IN UINT64 Dividend,
IN UINT32 Divisor
);
/**
Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
a 32-bit unsigned remainder.
This function divides the 64-bit unsigned value Dividend by the 32-bit
unsigned value Divisor and generates a 32-bit remainder. This function
returns the 32-bit unsigned remainder.
If Divisor is 0, then ASSERT().
@param Dividend A 64-bit unsigned value.
@param Divisor A 32-bit unsigned value.
@return Dividend % Divisor.
**/
UINT32
EFIAPI
ModU64x32 (
IN UINT64 Dividend,
IN UINT32 Divisor
);
/**
Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
a 64-bit unsigned result and an optional 32-bit unsigned remainder.
This function divides the 64-bit unsigned value Dividend by the 32-bit
unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
is not NULL, then the 32-bit unsigned remainder is returned in Remainder.
This function returns the 64-bit unsigned quotient.
If Divisor is 0, then ASSERT().
@param Dividend A 64-bit unsigned value.
@param Divisor A 32-bit unsigned value.
@param Remainder A pointer to a 32-bit unsigned value. This parameter is
optional and may be NULL.
@return Dividend / Divisor.
**/
UINT64
EFIAPI
DivU64x32Remainder (
IN UINT64 Dividend,
IN UINT32 Divisor,
OUT UINT32 *Remainder OPTIONAL
);
/**
Divides a 64-bit unsigned integer by a 64-bit unsigned integer and generates
a 64-bit unsigned result and an optional 64-bit unsigned remainder.
This function divides the 64-bit unsigned value Dividend by the 64-bit
unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
is not NULL, then the 64-bit unsigned remainder is returned in Remainder.
This function returns the 64-bit unsigned quotient.
If Divisor is 0, then ASSERT().
@param Dividend A 64-bit unsigned value.
@param Divisor A 64-bit unsigned value.
@param Remainder A pointer to a 64-bit unsigned value. This parameter is
optional and may be NULL.
@return Dividend / Divisor.
**/
UINT64
EFIAPI
DivU64x64Remainder (
IN UINT64 Dividend,
IN UINT64 Divisor,
OUT UINT64 *Remainder OPTIONAL
);
/**
Divides a 64-bit signed integer by a 64-bit signed integer and generates a
64-bit signed result and a optional 64-bit signed remainder.
This function divides the 64-bit signed value Dividend by the 64-bit signed
value Divisor and generates a 64-bit signed quotient. If Remainder is not
NULL, then the 64-bit signed remainder is returned in Remainder. This
function returns the 64-bit signed quotient.
It is the caller's responsibility to not call this function with a Divisor of 0.
If Divisor is 0, then the quotient and remainder should be assumed to be
the largest negative integer.
If Divisor is 0, then ASSERT().
@param Dividend A 64-bit signed value.
@param Divisor A 64-bit signed value.
@param Remainder A pointer to a 64-bit signed value. This parameter is
optional and may be NULL.
@return Dividend / Divisor.
**/
INT64
EFIAPI
DivS64x64Remainder (
IN INT64 Dividend,
IN INT64 Divisor,
OUT INT64 *Remainder OPTIONAL
);
/**
Reads a 16-bit value from memory that may be unaligned.
This function returns the 16-bit value pointed to by Buffer. The function
guarantees that the read operation does not produce an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 16-bit value that may be unaligned.
@return The 16-bit value read from Buffer.
**/
UINT16
EFIAPI
ReadUnaligned16 (
IN CONST UINT16 *Buffer
);
/**
Writes a 16-bit value to memory that may be unaligned.
This function writes the 16-bit value specified by Value to Buffer. Value is
returned. The function guarantees that the write operation does not produce
an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 16-bit value that may be unaligned.
@param Value 16-bit value to write to Buffer.
@return The 16-bit value to write to Buffer.
**/
UINT16
EFIAPI
WriteUnaligned16 (
OUT UINT16 *Buffer,
IN UINT16 Value
);
/**
Reads a 24-bit value from memory that may be unaligned.
This function returns the 24-bit value pointed to by Buffer. The function
guarantees that the read operation does not produce an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 24-bit value that may be unaligned.
@return The 24-bit value read from Buffer.
**/
UINT32
EFIAPI
ReadUnaligned24 (
IN CONST UINT32 *Buffer
);
/**
Writes a 24-bit value to memory that may be unaligned.
This function writes the 24-bit value specified by Value to Buffer. Value is
returned. The function guarantees that the write operation does not produce
an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 24-bit value that may be unaligned.
@param Value 24-bit value to write to Buffer.
@return The 24-bit value to write to Buffer.
**/
UINT32
EFIAPI
WriteUnaligned24 (
OUT UINT32 *Buffer,
IN UINT32 Value
);
/**
Reads a 32-bit value from memory that may be unaligned.
This function returns the 32-bit value pointed to by Buffer. The function
guarantees that the read operation does not produce an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 32-bit value that may be unaligned.
@return The 32-bit value read from Buffer.
**/
UINT32
EFIAPI
ReadUnaligned32 (
IN CONST UINT32 *Buffer
);
/**
Writes a 32-bit value to memory that may be unaligned.
This function writes the 32-bit value specified by Value to Buffer. Value is
returned. The function guarantees that the write operation does not produce
an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 32-bit value that may be unaligned.
@param Value 32-bit value to write to Buffer.
@return The 32-bit value to write to Buffer.
**/
UINT32
EFIAPI
WriteUnaligned32 (
OUT UINT32 *Buffer,
IN UINT32 Value
);
/**
Reads a 64-bit value from memory that may be unaligned.
This function returns the 64-bit value pointed to by Buffer. The function
guarantees that the read operation does not produce an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 64-bit value that may be unaligned.
@return The 64-bit value read from Buffer.
**/
UINT64
EFIAPI
ReadUnaligned64 (
IN CONST UINT64 *Buffer
);
/**
Writes a 64-bit value to memory that may be unaligned.
This function writes the 64-bit value specified by Value to Buffer. Value is
returned. The function guarantees that the write operation does not produce
an alignment fault.
If the Buffer is NULL, then ASSERT().
@param Buffer The pointer to a 64-bit value that may be unaligned.
@param Value 64-bit value to write to Buffer.
@return The 64-bit value to write to Buffer.
**/
UINT64
EFIAPI
WriteUnaligned64 (
OUT UINT64 *Buffer,
IN UINT64 Value
);
//
// Bit Field Functions
//
/**
Returns a bit field from an 8-bit value.
Returns the bitfield specified by the StartBit and the EndBit from Operand.
If 8-bit operations are not supported, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@return The bit field read.
**/
UINT8
EFIAPI
BitFieldRead8 (
IN UINT8 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to an 8-bit value, and returns the result.
Writes Value to the bit field specified by the StartBit and the EndBit in
Operand. All other bits in Operand are preserved. The new 8-bit value is
returned.
If 8-bit operations are not supported, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param Value New value of the bit field.
@return The new 8-bit value.
**/
UINT8
EFIAPI
BitFieldWrite8 (
IN UINT8 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 Value
);
/**
Reads a bit field from an 8-bit value, performs a bitwise OR, and returns the
result.
Performs a bitwise OR between the bit field specified by StartBit
and EndBit in Operand and the value specified by OrData. All other bits in
Operand are preserved. The new 8-bit value is returned.
If 8-bit operations are not supported, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param OrData The value to OR with the read value from the value
@return The new 8-bit value.
**/
UINT8
EFIAPI
BitFieldOr8 (
IN UINT8 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 OrData
);
/**
Reads a bit field from an 8-bit value, performs a bitwise AND, and returns
the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData. All other bits in Operand are
preserved. The new 8-bit value is returned.
If 8-bit operations are not supported, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param AndData The value to AND with the read value from the value.
@return The new 8-bit value.
**/
UINT8
EFIAPI
BitFieldAnd8 (
IN UINT8 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 AndData
);
/**
Reads a bit field from an 8-bit value, performs a bitwise AND followed by a
bitwise OR, and returns the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData, followed by a bitwise
OR with value specified by OrData. All other bits in Operand are
preserved. The new 8-bit value is returned.
If 8-bit operations are not supported, then ASSERT().
If StartBit is greater than 7, then ASSERT().
If EndBit is greater than 7, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..7.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..7.
@param AndData The value to AND with the read value from the value.
@param OrData The value to OR with the result of the AND operation.
@return The new 8-bit value.
**/
UINT8
EFIAPI
BitFieldAndThenOr8 (
IN UINT8 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT8 AndData,
IN UINT8 OrData
);
/**
Returns a bit field from a 16-bit value.
Returns the bitfield specified by the StartBit and the EndBit from Operand.
If 16-bit operations are not supported, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@return The bit field read.
**/
UINT16
EFIAPI
BitFieldRead16 (
IN UINT16 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to a 16-bit value, and returns the result.
Writes Value to the bit field specified by the StartBit and the EndBit in
Operand. All other bits in Operand are preserved. The new 16-bit value is
returned.
If 16-bit operations are not supported, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param Value New value of the bit field.
@return The new 16-bit value.
**/
UINT16
EFIAPI
BitFieldWrite16 (
IN UINT16 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 Value
);
/**
Reads a bit field from a 16-bit value, performs a bitwise OR, and returns the
result.
Performs a bitwise OR between the bit field specified by StartBit
and EndBit in Operand and the value specified by OrData. All other bits in
Operand are preserved. The new 16-bit value is returned.
If 16-bit operations are not supported, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param OrData The value to OR with the read value from the value
@return The new 16-bit value.
**/
UINT16
EFIAPI
BitFieldOr16 (
IN UINT16 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 OrData
);
/**
Reads a bit field from a 16-bit value, performs a bitwise AND, and returns
the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData. All other bits in Operand are
preserved. The new 16-bit value is returned.
If 16-bit operations are not supported, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param AndData The value to AND with the read value from the value
@return The new 16-bit value.
**/
UINT16
EFIAPI
BitFieldAnd16 (
IN UINT16 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 AndData
);
/**
Reads a bit field from a 16-bit value, performs a bitwise AND followed by a
bitwise OR, and returns the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData, followed by a bitwise
OR with value specified by OrData. All other bits in Operand are
preserved. The new 16-bit value is returned.
If 16-bit operations are not supported, then ASSERT().
If StartBit is greater than 15, then ASSERT().
If EndBit is greater than 15, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..15.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..15.
@param AndData The value to AND with the read value from the value.
@param OrData The value to OR with the result of the AND operation.
@return The new 16-bit value.
**/
UINT16
EFIAPI
BitFieldAndThenOr16 (
IN UINT16 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT16 AndData,
IN UINT16 OrData
);
/**
Returns a bit field from a 32-bit value.
Returns the bitfield specified by the StartBit and the EndBit from Operand.
If 32-bit operations are not supported, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@return The bit field read.
**/
UINT32
EFIAPI
BitFieldRead32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to a 32-bit value, and returns the result.
Writes Value to the bit field specified by the StartBit and the EndBit in
Operand. All other bits in Operand are preserved. The new 32-bit value is
returned.
If 32-bit operations are not supported, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param Value New value of the bit field.
@return The new 32-bit value.
**/
UINT32
EFIAPI
BitFieldWrite32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 Value
);
/**
Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the
result.
Performs a bitwise OR between the bit field specified by StartBit
and EndBit in Operand and the value specified by OrData. All other bits in
Operand are preserved. The new 32-bit value is returned.
If 32-bit operations are not supported, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param OrData The value to OR with the read value from the value.
@return The new 32-bit value.
**/
UINT32
EFIAPI
BitFieldOr32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 OrData
);
/**
Reads a bit field from a 32-bit value, performs a bitwise AND, and returns
the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData. All other bits in Operand are
preserved. The new 32-bit value is returned.
If 32-bit operations are not supported, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the read value from the value
@return The new 32-bit value.
**/
UINT32
EFIAPI
BitFieldAnd32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData
);
/**
Reads a bit field from a 32-bit value, performs a bitwise AND followed by a
bitwise OR, and returns the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData, followed by a bitwise
OR with value specified by OrData. All other bits in Operand are
preserved. The new 32-bit value is returned.
If 32-bit operations are not supported, then ASSERT().
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the read value from the value.
@param OrData The value to OR with the result of the AND operation.
@return The new 32-bit value.
**/
UINT32
EFIAPI
BitFieldAndThenOr32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData,
IN UINT32 OrData
);
/**
Returns a bit field from a 64-bit value.
Returns the bitfield specified by the StartBit and the EndBit from Operand.
If 64-bit operations are not supported, then ASSERT().
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@return The bit field read.
**/
UINT64
EFIAPI
BitFieldRead64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to a 64-bit value, and returns the result.
Writes Value to the bit field specified by the StartBit and the EndBit in
Operand. All other bits in Operand are preserved. The new 64-bit value is
returned.
If 64-bit operations are not supported, then ASSERT().
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param Value New value of the bit field.
@return The new 64-bit value.
**/
UINT64
EFIAPI
BitFieldWrite64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 Value
);
/**
Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the
result.
Performs a bitwise OR between the bit field specified by StartBit
and EndBit in Operand and the value specified by OrData. All other bits in
Operand are preserved. The new 64-bit value is returned.
If 64-bit operations are not supported, then ASSERT().
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param OrData The value to OR with the read value from the value
@return The new 64-bit value.
**/
UINT64
EFIAPI
BitFieldOr64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 OrData
);
/**
Reads a bit field from a 64-bit value, performs a bitwise AND, and returns
the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData. All other bits in Operand are
preserved. The new 64-bit value is returned.
If 64-bit operations are not supported, then ASSERT().
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param AndData The value to AND with the read value from the value
@return The new 64-bit value.
**/
UINT64
EFIAPI
BitFieldAnd64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 AndData
);
/**
Reads a bit field from a 64-bit value, performs a bitwise AND followed by a
bitwise OR, and returns the result.
Performs a bitwise AND between the bit field specified by StartBit and EndBit
in Operand and the value specified by AndData, followed by a bitwise
OR with value specified by OrData. All other bits in Operand are
preserved. The new 64-bit value is returned.
If 64-bit operations are not supported, then ASSERT().
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param AndData The value to AND with the read value from the value.
@param OrData The value to OR with the result of the AND operation.
@return The new 64-bit value.
**/
UINT64
EFIAPI
BitFieldAndThenOr64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 AndData,
IN UINT64 OrData
);
/**
Reads a bit field from a 32-bit value, counts and returns
the number of set bits.
Counts the number of set bits in the bit field specified by
StartBit and EndBit in Operand. The count is returned.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@return The number of bits set between StartBit and EndBit.
**/
UINT8
EFIAPI
BitFieldCountOnes32 (
IN UINT32 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Reads a bit field from a 64-bit value, counts and returns
the number of set bits.
Counts the number of set bits in the bit field specified by
StartBit and EndBit in Operand. The count is returned.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Operand Operand on which to perform the bitfield operation.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@return The number of bits set between StartBit and EndBit.
**/
UINT8
EFIAPI
BitFieldCountOnes64 (
IN UINT64 Operand,
IN UINTN StartBit,
IN UINTN EndBit
);
//
// Base Library Checksum Functions
//
/**
Returns the sum of all elements in a buffer in unit of UINT8.
During calculation, the carry bits are dropped.
This function calculates the sum of all elements in a buffer
in unit of UINT8. The carry bits in result of addition are dropped.
The result is returned as UINT8. If Length is Zero, then Zero is
returned.
If Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the sum operation.
@param Length The size, in bytes, of Buffer.
@return Sum The sum of Buffer with carry bits dropped during additions.
**/
UINT8
EFIAPI
CalculateSum8 (
IN CONST UINT8 *Buffer,
IN UINTN Length
);
/**
Returns the two's complement checksum of all elements in a buffer
of 8-bit values.
This function first calculates the sum of the 8-bit values in the
buffer specified by Buffer and Length. The carry bits in the result
of addition are dropped. Then, the two's complement of the sum is
returned. If Length is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the checksum operation.
@param Length The size, in bytes, of Buffer.
@return Checksum The two's complement checksum of Buffer.
**/
UINT8
EFIAPI
CalculateCheckSum8 (
IN CONST UINT8 *Buffer,
IN UINTN Length
);
/**
Returns the sum of all elements in a buffer of 16-bit values. During
calculation, the carry bits are dropped.
This function calculates the sum of the 16-bit values in the buffer
specified by Buffer and Length. The carry bits in result of addition are dropped.
The 16-bit result is returned. If Length is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 16-bit boundary, then ASSERT().
If Length is not aligned on a 16-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the sum operation.
@param Length The size, in bytes, of Buffer.
@return Sum The sum of Buffer with carry bits dropped during additions.
**/
UINT16
EFIAPI
CalculateSum16 (
IN CONST UINT16 *Buffer,
IN UINTN Length
);
/**
Returns the two's complement checksum of all elements in a buffer of
16-bit values.
This function first calculates the sum of the 16-bit values in the buffer
specified by Buffer and Length. The carry bits in the result of addition
are dropped. Then, the two's complement of the sum is returned. If Length
is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 16-bit boundary, then ASSERT().
If Length is not aligned on a 16-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the checksum operation.
@param Length The size, in bytes, of Buffer.
@return Checksum The two's complement checksum of Buffer.
**/
UINT16
EFIAPI
CalculateCheckSum16 (
IN CONST UINT16 *Buffer,
IN UINTN Length
);
/**
Returns the sum of all elements in a buffer of 32-bit values. During
calculation, the carry bits are dropped.
This function calculates the sum of the 32-bit values in the buffer
specified by Buffer and Length. The carry bits in result of addition are dropped.
The 32-bit result is returned. If Length is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 32-bit boundary, then ASSERT().
If Length is not aligned on a 32-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the sum operation.
@param Length The size, in bytes, of Buffer.
@return Sum The sum of Buffer with carry bits dropped during additions.
**/
UINT32
EFIAPI
CalculateSum32 (
IN CONST UINT32 *Buffer,
IN UINTN Length
);
/**
Returns the two's complement checksum of all elements in a buffer of
32-bit values.
This function first calculates the sum of the 32-bit values in the buffer
specified by Buffer and Length. The carry bits in the result of addition
are dropped. Then, the two's complement of the sum is returned. If Length
is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 32-bit boundary, then ASSERT().
If Length is not aligned on a 32-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the checksum operation.
@param Length The size, in bytes, of Buffer.
@return Checksum The two's complement checksum of Buffer.
**/
UINT32
EFIAPI
CalculateCheckSum32 (
IN CONST UINT32 *Buffer,
IN UINTN Length
);
/**
Returns the sum of all elements in a buffer of 64-bit values. During
calculation, the carry bits are dropped.
This function calculates the sum of the 64-bit values in the buffer
specified by Buffer and Length. The carry bits in result of addition are dropped.
The 64-bit result is returned. If Length is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 64-bit boundary, then ASSERT().
If Length is not aligned on a 64-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the sum operation.
@param Length The size, in bytes, of Buffer.
@return Sum The sum of Buffer with carry bits dropped during additions.
**/
UINT64
EFIAPI
CalculateSum64 (
IN CONST UINT64 *Buffer,
IN UINTN Length
);
/**
Returns the two's complement checksum of all elements in a buffer of
64-bit values.
This function first calculates the sum of the 64-bit values in the buffer
specified by Buffer and Length. The carry bits in the result of addition
are dropped. Then, the two's complement of the sum is returned. If Length
is 0, then 0 is returned.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 64-bit boundary, then ASSERT().
If Length is not aligned on a 64-bit boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the buffer to carry out the checksum operation.
@param Length The size, in bytes, of Buffer.
@return Checksum The two's complement checksum of Buffer.
**/
UINT64
EFIAPI
CalculateCheckSum64 (
IN CONST UINT64 *Buffer,
IN UINTN Length
);
/**
Computes and returns a 32-bit CRC for a data buffer.
CRC32 value bases on ITU-T V.42.
If Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param[in] Buffer A pointer to the buffer on which the 32-bit CRC is to be computed.
@param[in] Length The number of bytes in the buffer Data.
@retval Crc32 The 32-bit CRC was computed for the data buffer.
**/
UINT32
EFIAPI
CalculateCrc32 (
IN VOID *Buffer,
IN UINTN Length
);
/**
Calculates the CRC16-ANSI checksum of the given buffer.
@param[in] Buffer Pointer to the buffer.
@param[in] Length Length of the buffer, in bytes.
@param[in] InitialValue Initial value of the CRC.
@return The CRC16-ANSI checksum.
**/
UINT16
EFIAPI
CalculateCrc16Ansi (
IN CONST VOID *Buffer,
IN UINTN Length,
IN UINT16 InitialValue
);
//
// Initial value for the CRC16-ANSI algorithm, when no prior checksum has been calculated.
//
#define CRC16ANSI_INIT 0xffff
/**
Calculates the CRC32c checksum of the given buffer.
@param[in] Buffer Pointer to the buffer.
@param[in] Length Length of the buffer, in bytes.
@param[in] InitialValue Initial value of the CRC.
@return The CRC32c checksum.
**/
UINT32
EFIAPI
CalculateCrc32c (
IN CONST VOID *Buffer,
IN UINTN Length,
IN UINT32 InitialValue
);
//
// Base Library CPU Functions
//
/**
Function entry point used when a stack switch is requested with SwitchStack()
@param Context1 Context1 parameter passed into SwitchStack().
@param Context2 Context2 parameter passed into SwitchStack().
**/
typedef
VOID
(EFIAPI *SWITCH_STACK_ENTRY_POINT)(
IN VOID *Context1 OPTIONAL,
IN VOID *Context2 OPTIONAL
);
/**
Used to serialize load and store operations.
All loads and stores that proceed calls to this function are guaranteed to be
globally visible when this function returns.
**/
VOID
EFIAPI
MemoryFence (
VOID
);
/**
Saves the current CPU context that can be restored with a call to LongJump()
and returns 0.
Saves the current CPU context in the buffer specified by JumpBuffer and
returns 0. The initial call to SetJump() must always return 0. Subsequent
calls to LongJump() cause a non-zero value to be returned by SetJump().
If JumpBuffer is NULL, then ASSERT().
For Itanium processors, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
NOTE: The structure BASE_LIBRARY_JUMP_BUFFER is CPU architecture specific.
The same structure must never be used for more than one CPU architecture context.
For example, a BASE_LIBRARY_JUMP_BUFFER allocated by an IA-32 module must never be used from an x64 module.
SetJump()/LongJump() is not currently supported for the EBC processor type.
@param JumpBuffer A pointer to CPU context buffer.
@retval 0 Indicates a return from SetJump().
**/
RETURNS_TWICE
UINTN
EFIAPI
SetJump (
OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer
);
/**
Restores the CPU context that was saved with SetJump().
Restores the CPU context from the buffer specified by JumpBuffer. This
function never returns to the caller. Instead is resumes execution based on
the state of JumpBuffer.
If JumpBuffer is NULL, then ASSERT().
For Itanium processors, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
If Value is 0, then ASSERT().
@param JumpBuffer A pointer to CPU context buffer.
@param Value The value to return when the SetJump() context is
restored and must be non-zero.
**/
VOID
EFIAPI
LongJump (
IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer,
IN UINTN Value
);
/**
Enables CPU interrupts.
**/
VOID
EFIAPI
EnableInterrupts (
VOID
);
/**
Disables CPU interrupts.
**/
VOID
EFIAPI
DisableInterrupts (
VOID
);
/**
Disables CPU interrupts and returns the interrupt state prior to the disable
operation.
@retval TRUE CPU interrupts were enabled on entry to this call.
@retval FALSE CPU interrupts were disabled on entry to this call.
**/
BOOLEAN
EFIAPI
SaveAndDisableInterrupts (
VOID
);
/**
Enables CPU interrupts for the smallest window required to capture any
pending interrupts.
**/
VOID
EFIAPI
EnableDisableInterrupts (
VOID
);
/**
Retrieves the current CPU interrupt state.
Returns TRUE if interrupts are currently enabled. Otherwise
returns FALSE.
@retval TRUE CPU interrupts are enabled.
@retval FALSE CPU interrupts are disabled.
**/
BOOLEAN
EFIAPI
GetInterruptState (
VOID
);
/**
Set the current CPU interrupt state.
Sets the current CPU interrupt state to the state specified by
InterruptState. If InterruptState is TRUE, then interrupts are enabled. If
InterruptState is FALSE, then interrupts are disabled. InterruptState is
returned.
@param InterruptState TRUE if interrupts should enabled. FALSE if
interrupts should be disabled.
@return InterruptState
**/
BOOLEAN
EFIAPI
SetInterruptState (
IN BOOLEAN InterruptState
);
/**
Requests CPU to pause for a short period of time.
Requests CPU to pause for a short period of time. Typically used in MP
systems to prevent memory starvation while waiting for a spin lock.
**/
VOID
EFIAPI
CpuPause (
VOID
);
/**
Transfers control to a function starting with a new stack.
Transfers control to the function specified by EntryPoint using the
new stack specified by NewStack and passing in the parameters specified
by Context1 and Context2. Context1 and Context2 are optional and may
be NULL. The function EntryPoint must never return. This function
supports a variable number of arguments following the NewStack parameter.
These additional arguments are ignored on IA-32, x64, and EBC architectures.
Itanium processors expect one additional parameter of type VOID * that specifies
the new backing store pointer.
If EntryPoint is NULL, then ASSERT().
If NewStack is NULL, then ASSERT().
@param EntryPoint A pointer to function to call with the new stack.
@param Context1 A pointer to the context to pass into the EntryPoint
function.
@param Context2 A pointer to the context to pass into the EntryPoint
function.
@param NewStack A pointer to the new stack to use for the EntryPoint
function.
@param ... This variable argument list is ignored for IA-32, x64, and
EBC architectures. For Itanium processors, this variable
argument list is expected to contain a single parameter of
type VOID * that specifies the new backing store pointer.
**/
VOID
EFIAPI
SwitchStack (
IN SWITCH_STACK_ENTRY_POINT EntryPoint,
IN VOID *Context1 OPTIONAL,
IN VOID *Context2 OPTIONAL,
IN VOID *NewStack,
...
);
/**
Generates a breakpoint on the CPU.
Generates a breakpoint on the CPU. The breakpoint must be implemented such
that code can resume normal execution after the breakpoint.
**/
VOID
EFIAPI
CpuBreakpoint (
VOID
);
/**
Executes an infinite loop.
Forces the CPU to execute an infinite loop. A debugger may be used to skip
past the loop and the code that follows the loop must execute properly. This
implies that the infinite loop must not cause the code that follow it to be
optimized away.
**/
VOID
EFIAPI
CpuDeadLoop (
VOID
);
/**
Uses as a barrier to stop speculative execution.
Ensures that no later instruction will execute speculatively, until all prior
instructions have completed.
**/
VOID
EFIAPI
SpeculationBarrier (
VOID
);
#if defined (MDE_CPU_X64) || defined (MDE_CPU_IA32)
/**
The TDCALL instruction causes a VM exit to the Intel TDX module. It is
used to call guest-side Intel TDX functions, either local or a TD exit
to the host VMM, as selected by Leaf.
@param[in] Leaf Leaf number of TDCALL instruction
@param[in] Arg1 Arg1
@param[in] Arg2 Arg2
@param[in] Arg3 Arg3
@param[in,out] Results Returned result of the Leaf function
@return 0 A successful call
@return Other See individual leaf functions
**/
UINTN
EFIAPI
TdCall (
IN UINT64 Leaf,
IN UINT64 Arg1,
IN UINT64 Arg2,
IN UINT64 Arg3,
IN OUT VOID *Results
);
/**
TDVMALL is a leaf function 0 for TDCALL. It helps invoke services from the
host VMM to pass/receive information.
@param[in] Leaf Number of sub-functions
@param[in] Arg1 Arg1
@param[in] Arg2 Arg2
@param[in] Arg3 Arg3
@param[in] Arg4 Arg4
@param[in,out] Results Returned result of the sub-function
@return 0 A successful call
@return Other See individual sub-functions
**/
UINTN
EFIAPI
TdVmCall (
IN UINT64 Leaf,
IN UINT64 Arg1,
IN UINT64 Arg2,
IN UINT64 Arg3,
IN UINT64 Arg4,
IN OUT VOID *Results
);
/**
Probe if TD is enabled.
@return TRUE TD is enabled.
@return FALSE TD is not enabled.
**/
BOOLEAN
EFIAPI
TdIsEnabled (
VOID
);
#endif
#if defined (MDE_CPU_X64)
//
// The page size for the PVALIDATE instruction
//
typedef enum {
PvalidatePageSize4K = 0,
PvalidatePageSize2MB,
} PVALIDATE_PAGE_SIZE;
//
// PVALIDATE Return Code.
//
#define PVALIDATE_RET_SUCCESS 0
#define PVALIDATE_RET_FAIL_INPUT 1
#define PVALIDATE_RET_SIZE_MISMATCH 6
//
// The PVALIDATE instruction did not make any changes to the RMP entry.
//
#define PVALIDATE_RET_NO_RMPUPDATE 255
/**
Execute a PVALIDATE instruction to validate or to rescinds validation of a guest
page's RMP entry.
The instruction is available only when CPUID Fn8000_001F_EAX[SNP]=1.
The function is available on X64.
@param[in] PageSize The page size to use.
@param[in] Validate If TRUE, validate the guest virtual address
otherwise invalidate the guest virtual address.
@param[in] Address The guest virtual address.
@retval PVALIDATE_RET_SUCCESS The PVALIDATE instruction succeeded, and
updated the RMP entry.
@retval PVALIDATE_RET_NO_RMPUPDATE The PVALIDATE instruction succeeded, but
did not update the RMP entry.
@return Failure code from the PVALIDATE
instruction.
**/
UINT32
EFIAPI
AsmPvalidate (
IN PVALIDATE_PAGE_SIZE PageSize,
IN BOOLEAN Validate,
IN PHYSICAL_ADDRESS Address
);
//
// RDX settings for RMPADJUST
//
#define RMPADJUST_VMPL_MAX 3
#define RMPADJUST_VMPL_MASK 0xFF
#define RMPADJUST_VMPL_SHIFT 0
#define RMPADJUST_PERMISSION_MASK_MASK 0xFF
#define RMPADJUST_PERMISSION_MASK_SHIFT 8
#define RMPADJUST_VMSA_PAGE_BIT BIT16
/**
Adjusts the permissions of an SEV-SNP guest page.
Executes a RMPADJUST instruction with the register state specified by Rax,
Rcx, and Rdx. Returns Eax. This function is only available on X64.
The instruction is available only when CPUID Fn8000_001F_EAX[SNP]=1.
@param[in] Rax The value to load into RAX before executing the RMPADJUST
instruction.
@param[in] Rcx The value to load into RCX before executing the RMPADJUST
instruction.
@param[in] Rdx The value to load into RDX before executing the RMPADJUST
instruction.
@return Eax
**/
UINT32
EFIAPI
AsmRmpAdjust (
IN UINT64 Rax,
IN UINT64 Rcx,
IN UINT64 Rdx
);
#endif
#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
///
/// IA32 and x64 Specific Functions.
/// Byte packed structure for 16-bit Real Mode EFLAGS.
///
typedef union {
struct {
UINT32 CF : 1; ///< Carry Flag.
UINT32 Reserved_0 : 1; ///< Reserved.
UINT32 PF : 1; ///< Parity Flag.
UINT32 Reserved_1 : 1; ///< Reserved.
UINT32 AF : 1; ///< Auxiliary Carry Flag.
UINT32 Reserved_2 : 1; ///< Reserved.
UINT32 ZF : 1; ///< Zero Flag.
UINT32 SF : 1; ///< Sign Flag.
UINT32 TF : 1; ///< Trap Flag.
UINT32 IF : 1; ///< Interrupt Enable Flag.
UINT32 DF : 1; ///< Direction Flag.
UINT32 OF : 1; ///< Overflow Flag.
UINT32 IOPL : 2; ///< I/O Privilege Level.
UINT32 NT : 1; ///< Nested Task.
UINT32 Reserved_3 : 1; ///< Reserved.
} Bits;
UINT16 Uint16;
} IA32_FLAGS16;
///
/// Byte packed structure for EFLAGS/RFLAGS.
/// 32-bits on IA-32.
/// 64-bits on x64. The upper 32-bits on x64 are reserved.
///
typedef union {
struct {
UINT32 CF : 1; ///< Carry Flag.
UINT32 Reserved_0 : 1; ///< Reserved.
UINT32 PF : 1; ///< Parity Flag.
UINT32 Reserved_1 : 1; ///< Reserved.
UINT32 AF : 1; ///< Auxiliary Carry Flag.
UINT32 Reserved_2 : 1; ///< Reserved.
UINT32 ZF : 1; ///< Zero Flag.
UINT32 SF : 1; ///< Sign Flag.
UINT32 TF : 1; ///< Trap Flag.
UINT32 IF : 1; ///< Interrupt Enable Flag.
UINT32 DF : 1; ///< Direction Flag.
UINT32 OF : 1; ///< Overflow Flag.
UINT32 IOPL : 2; ///< I/O Privilege Level.
UINT32 NT : 1; ///< Nested Task.
UINT32 Reserved_3 : 1; ///< Reserved.
UINT32 RF : 1; ///< Resume Flag.
UINT32 VM : 1; ///< Virtual 8086 Mode.
UINT32 AC : 1; ///< Alignment Check.
UINT32 VIF : 1; ///< Virtual Interrupt Flag.
UINT32 VIP : 1; ///< Virtual Interrupt Pending.
UINT32 ID : 1; ///< ID Flag.
UINT32 Reserved_4 : 10; ///< Reserved.
} Bits;
UINTN UintN;
} IA32_EFLAGS32;
///
/// Byte packed structure for Control Register 0 (CR0).
/// 32-bits on IA-32.
/// 64-bits on x64. The upper 32-bits on x64 are reserved.
///
typedef union {
struct {
UINT32 PE : 1; ///< Protection Enable.
UINT32 MP : 1; ///< Monitor Coprocessor.
UINT32 EM : 1; ///< Emulation.
UINT32 TS : 1; ///< Task Switched.
UINT32 ET : 1; ///< Extension Type.
UINT32 NE : 1; ///< Numeric Error.
UINT32 Reserved_0 : 10; ///< Reserved.
UINT32 WP : 1; ///< Write Protect.
UINT32 Reserved_1 : 1; ///< Reserved.
UINT32 AM : 1; ///< Alignment Mask.
UINT32 Reserved_2 : 10; ///< Reserved.
UINT32 NW : 1; ///< Mot Write-through.
UINT32 CD : 1; ///< Cache Disable.
UINT32 PG : 1; ///< Paging.
} Bits;
UINTN UintN;
} IA32_CR0;
///
/// Byte packed structure for Control Register 4 (CR4).
/// 32-bits on IA-32.
/// 64-bits on x64. The upper 32-bits on x64 are reserved.
///
typedef union {
struct {
UINT32 VME : 1; ///< Virtual-8086 Mode Extensions.
UINT32 PVI : 1; ///< Protected-Mode Virtual Interrupts.
UINT32 TSD : 1; ///< Time Stamp Disable.
UINT32 DE : 1; ///< Debugging Extensions.
UINT32 PSE : 1; ///< Page Size Extensions.
UINT32 PAE : 1; ///< Physical Address Extension.
UINT32 MCE : 1; ///< Machine Check Enable.
UINT32 PGE : 1; ///< Page Global Enable.
UINT32 PCE : 1; ///< Performance Monitoring Counter
///< Enable.
UINT32 OSFXSR : 1; ///< Operating System Support for
///< FXSAVE and FXRSTOR instructions
UINT32 OSXMMEXCPT : 1; ///< Operating System Support for
///< Unmasked SIMD Floating Point
///< Exceptions.
UINT32 UMIP : 1; ///< User-Mode Instruction Prevention.
UINT32 LA57 : 1; ///< Linear Address 57bit.
UINT32 VMXE : 1; ///< VMX Enable.
UINT32 SMXE : 1; ///< SMX Enable.
UINT32 Reserved_3 : 1; ///< Reserved.
UINT32 FSGSBASE : 1; ///< FSGSBASE Enable.
UINT32 PCIDE : 1; ///< PCID Enable.
UINT32 OSXSAVE : 1; ///< XSAVE and Processor Extended States Enable.
UINT32 Reserved_4 : 1; ///< Reserved.
UINT32 SMEP : 1; ///< SMEP Enable.
UINT32 SMAP : 1; ///< SMAP Enable.
UINT32 PKE : 1; ///< Protection-Key Enable.
UINT32 Reserved_5 : 9; ///< Reserved.
} Bits;
UINTN UintN;
} IA32_CR4;
///
/// Byte packed structure for a segment descriptor in a GDT/LDT.
///
typedef union {
struct {
UINT32 LimitLow : 16;
UINT32 BaseLow : 16;
UINT32 BaseMid : 8;
UINT32 Type : 4;
UINT32 S : 1;
UINT32 DPL : 2;
UINT32 P : 1;
UINT32 LimitHigh : 4;
UINT32 AVL : 1;
UINT32 L : 1;
UINT32 DB : 1;
UINT32 G : 1;
UINT32 BaseHigh : 8;
} Bits;
UINT64 Uint64;
} IA32_SEGMENT_DESCRIPTOR;
///
/// Byte packed structure for an IDTR, GDTR, LDTR descriptor.
///
#pragma pack (1)
typedef struct {
UINT16 Limit;
UINTN Base;
} IA32_DESCRIPTOR;
#pragma pack ()
#define IA32_IDT_GATE_TYPE_TASK 0x85
#define IA32_IDT_GATE_TYPE_INTERRUPT_16 0x86
#define IA32_IDT_GATE_TYPE_TRAP_16 0x87
#define IA32_IDT_GATE_TYPE_INTERRUPT_32 0x8E
#define IA32_IDT_GATE_TYPE_TRAP_32 0x8F
#define IA32_GDT_TYPE_TSS 0x9
#define IA32_GDT_ALIGNMENT 8
#if defined (MDE_CPU_IA32)
///
/// Byte packed structure for an IA-32 Interrupt Gate Descriptor.
///
typedef union {
struct {
UINT32 OffsetLow : 16; ///< Offset bits 15..0.
UINT32 Selector : 16; ///< Selector.
UINT32 Reserved_0 : 8; ///< Reserved.
UINT32 GateType : 8; ///< Gate Type. See #defines above.
UINT32 OffsetHigh : 16; ///< Offset bits 31..16.
} Bits;
UINT64 Uint64;
} IA32_IDT_GATE_DESCRIPTOR;
#pragma pack (1)
//
// IA32 Task-State Segment Definition
//
typedef struct {
UINT16 PreviousTaskLink;
UINT16 Reserved_2;
UINT32 ESP0;
UINT16 SS0;
UINT16 Reserved_10;
UINT32 ESP1;
UINT16 SS1;
UINT16 Reserved_18;
UINT32 ESP2;
UINT16 SS2;
UINT16 Reserved_26;
UINT32 CR3;
UINT32 EIP;
UINT32 EFLAGS;
UINT32 EAX;
UINT32 ECX;
UINT32 EDX;
UINT32 EBX;
UINT32 ESP;
UINT32 EBP;
UINT32 ESI;
UINT32 EDI;
UINT16 ES;
UINT16 Reserved_74;
UINT16 CS;
UINT16 Reserved_78;
UINT16 SS;
UINT16 Reserved_82;
UINT16 DS;
UINT16 Reserved_86;
UINT16 FS;
UINT16 Reserved_90;
UINT16 GS;
UINT16 Reserved_94;
UINT16 LDTSegmentSelector;
UINT16 Reserved_98;
UINT16 T;
UINT16 IOMapBaseAddress;
} IA32_TASK_STATE_SEGMENT;
typedef union {
struct {
UINT32 LimitLow : 16; ///< Segment Limit 15..00
UINT32 BaseLow : 16; ///< Base Address 15..00
UINT32 BaseMid : 8; ///< Base Address 23..16
UINT32 Type : 4; ///< Type (1 0 B 1)
UINT32 Reserved_43 : 1; ///< 0
UINT32 DPL : 2; ///< Descriptor Privilege Level
UINT32 P : 1; ///< Segment Present
UINT32 LimitHigh : 4; ///< Segment Limit 19..16
UINT32 AVL : 1; ///< Available for use by system software
UINT32 Reserved_52 : 2; ///< 0 0
UINT32 G : 1; ///< Granularity
UINT32 BaseHigh : 8; ///< Base Address 31..24
} Bits;
UINT64 Uint64;
} IA32_TSS_DESCRIPTOR;
#pragma pack ()
#endif // defined (MDE_CPU_IA32)
#if defined (MDE_CPU_X64)
///
/// Byte packed structure for an x64 Interrupt Gate Descriptor.
///
typedef union {
struct {
UINT32 OffsetLow : 16; ///< Offset bits 15..0.
UINT32 Selector : 16; ///< Selector.
UINT32 Reserved_0 : 8; ///< Reserved.
UINT32 GateType : 8; ///< Gate Type. See #defines above.
UINT32 OffsetHigh : 16; ///< Offset bits 31..16.
UINT32 OffsetUpper : 32; ///< Offset bits 63..32.
UINT32 Reserved_1 : 32; ///< Reserved.
} Bits;
struct {
UINT64 Uint64;
UINT64 Uint64_1;
} Uint128;
} IA32_IDT_GATE_DESCRIPTOR;
#pragma pack (1)
//
// IA32 Task-State Segment Definition
//
typedef struct {
UINT32 Reserved_0;
UINT64 RSP0;
UINT64 RSP1;
UINT64 RSP2;
UINT64 Reserved_28;
UINT64 IST[7];
UINT64 Reserved_92;
UINT16 Reserved_100;
UINT16 IOMapBaseAddress;
} IA32_TASK_STATE_SEGMENT;
typedef union {
struct {
UINT32 LimitLow : 16; ///< Segment Limit 15..00
UINT32 BaseLow : 16; ///< Base Address 15..00
UINT32 BaseMidl : 8; ///< Base Address 23..16
UINT32 Type : 4; ///< Type (1 0 B 1)
UINT32 Reserved_43 : 1; ///< 0
UINT32 DPL : 2; ///< Descriptor Privilege Level
UINT32 P : 1; ///< Segment Present
UINT32 LimitHigh : 4; ///< Segment Limit 19..16
UINT32 AVL : 1; ///< Available for use by system software
UINT32 Reserved_52 : 2; ///< 0 0
UINT32 G : 1; ///< Granularity
UINT32 BaseMidh : 8; ///< Base Address 31..24
UINT32 BaseHigh : 32; ///< Base Address 63..32
UINT32 Reserved_96 : 32; ///< Reserved
} Bits;
struct {
UINT64 Uint64;
UINT64 Uint64_1;
} Uint128;
} IA32_TSS_DESCRIPTOR;
#pragma pack ()
#endif // defined (MDE_CPU_X64)
///
/// Byte packed structure for an FP/SSE/SSE2 context.
///
typedef struct {
UINT8 Buffer[512];
} IA32_FX_BUFFER;
///
/// Structures for the 16-bit real mode thunks.
///
typedef struct {
UINT32 Reserved1;
UINT32 Reserved2;
UINT32 Reserved3;
UINT32 Reserved4;
UINT8 BL;
UINT8 BH;
UINT16 Reserved5;
UINT8 DL;
UINT8 DH;
UINT16 Reserved6;
UINT8 CL;
UINT8 CH;
UINT16 Reserved7;
UINT8 AL;
UINT8 AH;
UINT16 Reserved8;
} IA32_BYTE_REGS;
typedef struct {
UINT16 DI;
UINT16 Reserved1;
UINT16 SI;
UINT16 Reserved2;
UINT16 BP;
UINT16 Reserved3;
UINT16 SP;
UINT16 Reserved4;
UINT16 BX;
UINT16 Reserved5;
UINT16 DX;
UINT16 Reserved6;
UINT16 CX;
UINT16 Reserved7;
UINT16 AX;
UINT16 Reserved8;
} IA32_WORD_REGS;
typedef struct {
UINT32 EDI;
UINT32 ESI;
UINT32 EBP;
UINT32 ESP;
UINT32 EBX;
UINT32 EDX;
UINT32 ECX;
UINT32 EAX;
UINT16 DS;
UINT16 ES;
UINT16 FS;
UINT16 GS;
IA32_EFLAGS32 EFLAGS;
UINT32 Eip;
UINT16 CS;
UINT16 SS;
} IA32_DWORD_REGS;
typedef union {
IA32_DWORD_REGS E;
IA32_WORD_REGS X;
IA32_BYTE_REGS H;
} IA32_REGISTER_SET;
///
/// Byte packed structure for an 16-bit real mode thunks.
///
typedef struct {
IA32_REGISTER_SET *RealModeState;
VOID *RealModeBuffer;
UINT32 RealModeBufferSize;
UINT32 ThunkAttributes;
} THUNK_CONTEXT;
#define THUNK_ATTRIBUTE_BIG_REAL_MODE 0x00000001
#define THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 0x00000002
#define THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL 0x00000004
///
/// Type definition for representing labels in NASM source code that allow for
/// the patching of immediate operands of IA32 and X64 instructions.
///
/// While the type is technically defined as a function type (note: not a
/// pointer-to-function type), such labels in NASM source code never stand for
/// actual functions, and identifiers declared with this function type should
/// never be called. This is also why the EFIAPI calling convention specifier
/// is missing from the typedef, and why the typedef does not follow the usual
/// edk2 coding style for function (or pointer-to-function) typedefs. The VOID
/// return type and the VOID argument list are merely artifacts.
///
typedef VOID (X86_ASSEMBLY_PATCH_LABEL) (
VOID
);
/**
Retrieves CPUID information.
Executes the CPUID instruction with EAX set to the value specified by Index.
This function always returns Index.
If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.
If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.
If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.
If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.
This function is only available on IA-32 and x64.
@param Index The 32-bit value to load into EAX prior to invoking the CPUID
instruction.
@param Eax The pointer to the 32-bit EAX value returned by the CPUID
instruction. This is an optional parameter that may be NULL.
@param Ebx The pointer to the 32-bit EBX value returned by the CPUID
instruction. This is an optional parameter that may be NULL.
@param Ecx The pointer to the 32-bit ECX value returned by the CPUID
instruction. This is an optional parameter that may be NULL.
@param Edx The pointer to the 32-bit EDX value returned by the CPUID
instruction. This is an optional parameter that may be NULL.
@return Index.
**/
UINT32
EFIAPI
AsmCpuid (
IN UINT32 Index,
OUT UINT32 *Eax OPTIONAL,
OUT UINT32 *Ebx OPTIONAL,
OUT UINT32 *Ecx OPTIONAL,
OUT UINT32 *Edx OPTIONAL
);
/**
Retrieves CPUID information using an extended leaf identifier.
Executes the CPUID instruction with EAX set to the value specified by Index
and ECX set to the value specified by SubIndex. This function always returns
Index. This function is only available on IA-32 and x64.
If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.
If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.
If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.
If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.
@param Index The 32-bit value to load into EAX prior to invoking the
CPUID instruction.
@param SubIndex The 32-bit value to load into ECX prior to invoking the
CPUID instruction.
@param Eax The pointer to the 32-bit EAX value returned by the CPUID
instruction. This is an optional parameter that may be
NULL.
@param Ebx The pointer to the 32-bit EBX value returned by the CPUID
instruction. This is an optional parameter that may be
NULL.
@param Ecx The pointer to the 32-bit ECX value returned by the CPUID
instruction. This is an optional parameter that may be
NULL.
@param Edx The pointer to the 32-bit EDX value returned by the CPUID
instruction. This is an optional parameter that may be
NULL.
@return Index.
**/
UINT32
EFIAPI
AsmCpuidEx (
IN UINT32 Index,
IN UINT32 SubIndex,
OUT UINT32 *Eax OPTIONAL,
OUT UINT32 *Ebx OPTIONAL,
OUT UINT32 *Ecx OPTIONAL,
OUT UINT32 *Edx OPTIONAL
);
/**
Set CD bit and clear NW bit of CR0 followed by a WBINVD.
Disables the caches by setting the CD bit of CR0 to 1, clearing the NW bit of CR0 to 0,
and executing a WBINVD instruction. This function is only available on IA-32 and x64.
**/
VOID
EFIAPI
AsmDisableCache (
VOID
);
/**
Perform a WBINVD and clear both the CD and NW bits of CR0.
Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
bits of CR0 to 0. This function is only available on IA-32 and x64.
**/
VOID
EFIAPI
AsmEnableCache (
VOID
);
/**
Returns the lower 32-bits of a Machine Specific Register(MSR).
Reads and returns the lower 32-bits of the MSR specified by Index.
No parameter checking is performed on Index, and some Index values may cause
CPU exceptions. The caller must either guarantee that Index is valid, or the
caller must set up exception handlers to catch the exceptions. This function
is only available on IA-32 and x64.
@param Index The 32-bit MSR index to read.
@return The lower 32 bits of the MSR identified by Index.
**/
UINT32
EFIAPI
AsmReadMsr32 (
IN UINT32 Index
);
/**
Writes a 32-bit value to a Machine Specific Register(MSR), and returns the value.
The upper 32-bits of the MSR are set to zero.
Writes the 32-bit value specified by Value to the MSR specified by Index. The
upper 32-bits of the MSR write are set to zero. The 32-bit value written to
the MSR is returned. No parameter checking is performed on Index or Value,
and some of these may cause CPU exceptions. The caller must either guarantee
that Index and Value are valid, or the caller must establish proper exception
handlers. This function is only available on IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param Value The 32-bit value to write to the MSR.
@return Value
**/
UINT32
EFIAPI
AsmWriteMsr32 (
IN UINT32 Index,
IN UINT32 Value
);
/**
Reads a 64-bit MSR, performs a bitwise OR on the lower 32-bits, and
writes the result back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise OR
between the lower 32-bits of the read result and the value specified by
OrData, and writes the result to the 64-bit MSR specified by Index. The lower
32-bits of the value written to the MSR is returned. No parameter checking is
performed on Index or OrData, and some of these may cause CPU exceptions. The
caller must either guarantee that Index and OrData are valid, or the caller
must establish proper exception handlers. This function is only available on
IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param OrData The value to OR with the read value from the MSR.
@return The lower 32-bit value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrOr32 (
IN UINT32 Index,
IN UINT32 OrData
);
/**
Reads a 64-bit MSR, performs a bitwise AND on the lower 32-bits, and writes
the result back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between the
lower 32-bits of the read result and the value specified by AndData, and
writes the result to the 64-bit MSR specified by Index. The lower 32-bits of
the value written to the MSR is returned. No parameter checking is performed
on Index or AndData, and some of these may cause CPU exceptions. The caller
must either guarantee that Index and AndData are valid, or the caller must
establish proper exception handlers. This function is only available on IA-32
and x64.
@param Index The 32-bit MSR index to write.
@param AndData The value to AND with the read value from the MSR.
@return The lower 32-bit value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrAnd32 (
IN UINT32 Index,
IN UINT32 AndData
);
/**
Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise OR
on the lower 32-bits, and writes the result back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between the
lower 32-bits of the read result and the value specified by AndData
preserving the upper 32-bits, performs a bitwise OR between the
result of the AND operation and the value specified by OrData, and writes the
result to the 64-bit MSR specified by Address. The lower 32-bits of the value
written to the MSR is returned. No parameter checking is performed on Index,
AndData, or OrData, and some of these may cause CPU exceptions. The caller
must either guarantee that Index, AndData, and OrData are valid, or the
caller must establish proper exception handlers. This function is only
available on IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param AndData The value to AND with the read value from the MSR.
@param OrData The value to OR with the result of the AND operation.
@return The lower 32-bit value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrAndThenOr32 (
IN UINT32 Index,
IN UINT32 AndData,
IN UINT32 OrData
);
/**
Reads a bit field of an MSR.
Reads the bit field in the lower 32-bits of a 64-bit MSR. The bit field is
specified by the StartBit and the EndBit. The value of the bit field is
returned. The caller must either guarantee that Index is valid, or the caller
must set up exception handlers to catch the exceptions. This function is only
available on IA-32 and x64.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Index The 32-bit MSR index to read.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@return The bit field read from the MSR.
**/
UINT32
EFIAPI
AsmMsrBitFieldRead32 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to an MSR.
Writes Value to a bit field in the lower 32-bits of a 64-bit MSR. The bit
field is specified by the StartBit and the EndBit. All other bits in the
destination MSR are preserved. The lower 32-bits of the MSR written is
returned. The caller must either guarantee that Index and the data written
is valid, or the caller must set up exception handlers to catch the exceptions.
This function is only available on IA-32 and x64.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param Value New value of the bit field.
@return The lower 32-bit of the value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrBitFieldWrite32 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 Value
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise OR, and writes the
result back to the bit field in the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise OR
between the read result and the value specified by OrData, and writes the
result to the 64-bit MSR specified by Index. The lower 32-bits of the value
written to the MSR are returned. Extra left bits in OrData are stripped. The
caller must either guarantee that Index and the data written is valid, or
the caller must set up exception handlers to catch the exceptions. This
function is only available on IA-32 and x64.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param OrData The value to OR with the read value from the MSR.
@return The lower 32-bit of the value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrBitFieldOr32 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 OrData
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND, and writes the
result back to the bit field in the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between the
read result and the value specified by AndData, and writes the result to the
64-bit MSR specified by Index. The lower 32-bits of the value written to the
MSR are returned. Extra left bits in AndData are stripped. The caller must
either guarantee that Index and the data written is valid, or the caller must
set up exception handlers to catch the exceptions. This function is only
available on IA-32 and x64.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the read value from the MSR.
@return The lower 32-bit of the value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrBitFieldAnd32 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a
bitwise OR, and writes the result back to the bit field in the
64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND followed by a
bitwise OR between the read result and the value specified by
AndData, and writes the result to the 64-bit MSR specified by Index. The
lower 32-bits of the value written to the MSR are returned. Extra left bits
in both AndData and OrData are stripped. The caller must either guarantee
that Index and the data written is valid, or the caller must set up exception
handlers to catch the exceptions. This function is only available on IA-32
and x64.
If StartBit is greater than 31, then ASSERT().
If EndBit is greater than 31, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..31.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..31.
@param AndData The value to AND with the read value from the MSR.
@param OrData The value to OR with the result of the AND operation.
@return The lower 32-bit of the value written to the MSR.
**/
UINT32
EFIAPI
AsmMsrBitFieldAndThenOr32 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT32 AndData,
IN UINT32 OrData
);
/**
Returns a 64-bit Machine Specific Register(MSR).
Reads and returns the 64-bit MSR specified by Index. No parameter checking is
performed on Index, and some Index values may cause CPU exceptions. The
caller must either guarantee that Index is valid, or the caller must set up
exception handlers to catch the exceptions. This function is only available
on IA-32 and x64.
@param Index The 32-bit MSR index to read.
@return The value of the MSR identified by Index.
**/
UINT64
EFIAPI
AsmReadMsr64 (
IN UINT32 Index
);
/**
Writes a 64-bit value to a Machine Specific Register(MSR), and returns the
value.
Writes the 64-bit value specified by Value to the MSR specified by Index. The
64-bit value written to the MSR is returned. No parameter checking is
performed on Index or Value, and some of these may cause CPU exceptions. The
caller must either guarantee that Index and Value are valid, or the caller
must establish proper exception handlers. This function is only available on
IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param Value The 64-bit value to write to the MSR.
@return Value
**/
UINT64
EFIAPI
AsmWriteMsr64 (
IN UINT32 Index,
IN UINT64 Value
);
/**
Reads a 64-bit MSR, performs a bitwise OR, and writes the result
back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise OR
between the read result and the value specified by OrData, and writes the
result to the 64-bit MSR specified by Index. The value written to the MSR is
returned. No parameter checking is performed on Index or OrData, and some of
these may cause CPU exceptions. The caller must either guarantee that Index
and OrData are valid, or the caller must establish proper exception handlers.
This function is only available on IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param OrData The value to OR with the read value from the MSR.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrOr64 (
IN UINT32 Index,
IN UINT64 OrData
);
/**
Reads a 64-bit MSR, performs a bitwise AND, and writes the result back to the
64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between the
read result and the value specified by OrData, and writes the result to the
64-bit MSR specified by Index. The value written to the MSR is returned. No
parameter checking is performed on Index or OrData, and some of these may
cause CPU exceptions. The caller must either guarantee that Index and OrData
are valid, or the caller must establish proper exception handlers. This
function is only available on IA-32 and x64.
@param Index The 32-bit MSR index to write.
@param AndData The value to AND with the read value from the MSR.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrAnd64 (
IN UINT32 Index,
IN UINT64 AndData
);
/**
Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise
OR, and writes the result back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between read
result and the value specified by AndData, performs a bitwise OR
between the result of the AND operation and the value specified by OrData,
and writes the result to the 64-bit MSR specified by Index. The value written
to the MSR is returned. No parameter checking is performed on Index, AndData,
or OrData, and some of these may cause CPU exceptions. The caller must either
guarantee that Index, AndData, and OrData are valid, or the caller must
establish proper exception handlers. This function is only available on IA-32
and x64.
@param Index The 32-bit MSR index to write.
@param AndData The value to AND with the read value from the MSR.
@param OrData The value to OR with the result of the AND operation.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrAndThenOr64 (
IN UINT32 Index,
IN UINT64 AndData,
IN UINT64 OrData
);
/**
Reads a bit field of an MSR.
Reads the bit field in the 64-bit MSR. The bit field is specified by the
StartBit and the EndBit. The value of the bit field is returned. The caller
must either guarantee that Index is valid, or the caller must set up
exception handlers to catch the exceptions. This function is only available
on IA-32 and x64.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
@param Index The 32-bit MSR index to read.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@return The value read from the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldRead64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit
);
/**
Writes a bit field to an MSR.
Writes Value to a bit field in a 64-bit MSR. The bit field is specified by
the StartBit and the EndBit. All other bits in the destination MSR are
preserved. The MSR written is returned. The caller must either guarantee
that Index and the data written is valid, or the caller must set up exception
handlers to catch the exceptions. This function is only available on IA-32 and x64.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param Value New value of the bit field.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldWrite64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 Value
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise OR, and
writes the result back to the bit field in the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise OR
between the read result and the value specified by OrData, and writes the
result to the 64-bit MSR specified by Index. The value written to the MSR is
returned. Extra left bits in OrData are stripped. The caller must either
guarantee that Index and the data written is valid, or the caller must set up
exception handlers to catch the exceptions. This function is only available
on IA-32 and x64.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param OrData The value to OR with the read value from the bit field.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldOr64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 OrData
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND, and writes the
result back to the bit field in the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND between the
read result and the value specified by AndData, and writes the result to the
64-bit MSR specified by Index. The value written to the MSR is returned.
Extra left bits in AndData are stripped. The caller must either guarantee
that Index and the data written is valid, or the caller must set up exception
handlers to catch the exceptions. This function is only available on IA-32
and x64.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param AndData The value to AND with the read value from the bit field.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldAnd64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 AndData
);
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a
bitwise OR, and writes the result back to the bit field in the
64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise AND followed by
a bitwise OR between the read result and the value specified by
AndData, and writes the result to the 64-bit MSR specified by Index. The
value written to the MSR is returned. Extra left bits in both AndData and
OrData are stripped. The caller must either guarantee that Index and the data
written is valid, or the caller must set up exception handlers to catch the
exceptions. This function is only available on IA-32 and x64.
If StartBit is greater than 63, then ASSERT().
If EndBit is greater than 63, then ASSERT().
If EndBit is less than StartBit, then ASSERT().
If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().
@param Index The 32-bit MSR index to write.
@param StartBit The ordinal of the least significant bit in the bit field.
Range 0..63.
@param EndBit The ordinal of the most significant bit in the bit field.
Range 0..63.
@param AndData The value to AND with the read value from the bit field.
@param OrData The value to OR with the result of the AND operation.
@return The value written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldAndThenOr64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit,
IN UINT64 AndData,
IN UINT64 OrData
);
/**
Reads the current value of the EFLAGS register.
Reads and returns the current value of the EFLAGS register. This function is
only available on IA-32 and x64. This returns a 32-bit value on IA-32 and a
64-bit value on x64.
@return EFLAGS on IA-32 or RFLAGS on x64.
**/
UINTN
EFIAPI
AsmReadEflags (
VOID
);
/**
Reads the current value of the Control Register 0 (CR0).
Reads and returns the current value of CR0. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of the Control Register 0 (CR0).
**/
UINTN
EFIAPI
AsmReadCr0 (
VOID
);
/**
Reads the current value of the Control Register 2 (CR2).
Reads and returns the current value of CR2. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of the Control Register 2 (CR2).
**/
UINTN
EFIAPI
AsmReadCr2 (
VOID
);
/**
Reads the current value of the Control Register 3 (CR3).
Reads and returns the current value of CR3. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of the Control Register 3 (CR3).
**/
UINTN
EFIAPI
AsmReadCr3 (
VOID
);
/**
Reads the current value of the Control Register 4 (CR4).
Reads and returns the current value of CR4. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of the Control Register 4 (CR4).
**/
UINTN
EFIAPI
AsmReadCr4 (
VOID
);
/**
Writes a value to Control Register 0 (CR0).
Writes and returns a new value to CR0. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Cr0 The value to write to CR0.
@return The value written to CR0.
**/
UINTN
EFIAPI
AsmWriteCr0 (
UINTN Cr0
);
/**
Writes a value to Control Register 2 (CR2).
Writes and returns a new value to CR2. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Cr2 The value to write to CR2.
@return The value written to CR2.
**/
UINTN
EFIAPI
AsmWriteCr2 (
UINTN Cr2
);
/**
Writes a value to Control Register 3 (CR3).
Writes and returns a new value to CR3. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Cr3 The value to write to CR3.
@return The value written to CR3.
**/
UINTN
EFIAPI
AsmWriteCr3 (
UINTN Cr3
);
/**
Writes a value to Control Register 4 (CR4).
Writes and returns a new value to CR4. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Cr4 The value to write to CR4.
@return The value written to CR4.
**/
UINTN
EFIAPI
AsmWriteCr4 (
UINTN Cr4
);
/**
Reads the current value of Debug Register 0 (DR0).
Reads and returns the current value of DR0. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 0 (DR0).
**/
UINTN
EFIAPI
AsmReadDr0 (
VOID
);
/**
Reads the current value of Debug Register 1 (DR1).
Reads and returns the current value of DR1. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 1 (DR1).
**/
UINTN
EFIAPI
AsmReadDr1 (
VOID
);
/**
Reads the current value of Debug Register 2 (DR2).
Reads and returns the current value of DR2. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 2 (DR2).
**/
UINTN
EFIAPI
AsmReadDr2 (
VOID
);
/**
Reads the current value of Debug Register 3 (DR3).
Reads and returns the current value of DR3. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 3 (DR3).
**/
UINTN
EFIAPI
AsmReadDr3 (
VOID
);
/**
Reads the current value of Debug Register 4 (DR4).
Reads and returns the current value of DR4. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 4 (DR4).
**/
UINTN
EFIAPI
AsmReadDr4 (
VOID
);
/**
Reads the current value of Debug Register 5 (DR5).
Reads and returns the current value of DR5. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 5 (DR5).
**/
UINTN
EFIAPI
AsmReadDr5 (
VOID
);
/**
Reads the current value of Debug Register 6 (DR6).
Reads and returns the current value of DR6. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 6 (DR6).
**/
UINTN
EFIAPI
AsmReadDr6 (
VOID
);
/**
Reads the current value of Debug Register 7 (DR7).
Reads and returns the current value of DR7. This function is only available
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on
x64.
@return The value of Debug Register 7 (DR7).
**/
UINTN
EFIAPI
AsmReadDr7 (
VOID
);
/**
Writes a value to Debug Register 0 (DR0).
Writes and returns a new value to DR0. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr0 The value to write to Dr0.
@return The value written to Debug Register 0 (DR0).
**/
UINTN
EFIAPI
AsmWriteDr0 (
UINTN Dr0
);
/**
Writes a value to Debug Register 1 (DR1).
Writes and returns a new value to DR1. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr1 The value to write to Dr1.
@return The value written to Debug Register 1 (DR1).
**/
UINTN
EFIAPI
AsmWriteDr1 (
UINTN Dr1
);
/**
Writes a value to Debug Register 2 (DR2).
Writes and returns a new value to DR2. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr2 The value to write to Dr2.
@return The value written to Debug Register 2 (DR2).
**/
UINTN
EFIAPI
AsmWriteDr2 (
UINTN Dr2
);
/**
Writes a value to Debug Register 3 (DR3).
Writes and returns a new value to DR3. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr3 The value to write to Dr3.
@return The value written to Debug Register 3 (DR3).
**/
UINTN
EFIAPI
AsmWriteDr3 (
UINTN Dr3
);
/**
Writes a value to Debug Register 4 (DR4).
Writes and returns a new value to DR4. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr4 The value to write to Dr4.
@return The value written to Debug Register 4 (DR4).
**/
UINTN
EFIAPI
AsmWriteDr4 (
UINTN Dr4
);
/**
Writes a value to Debug Register 5 (DR5).
Writes and returns a new value to DR5. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr5 The value to write to Dr5.
@return The value written to Debug Register 5 (DR5).
**/
UINTN
EFIAPI
AsmWriteDr5 (
UINTN Dr5
);
/**
Writes a value to Debug Register 6 (DR6).
Writes and returns a new value to DR6. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr6 The value to write to Dr6.
@return The value written to Debug Register 6 (DR6).
**/
UINTN
EFIAPI
AsmWriteDr6 (
UINTN Dr6
);
/**
Writes a value to Debug Register 7 (DR7).
Writes and returns a new value to DR7. This function is only available on
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
@param Dr7 The value to write to Dr7.
@return The value written to Debug Register 7 (DR7).
**/
UINTN
EFIAPI
AsmWriteDr7 (
UINTN Dr7
);
/**
Reads the current value of Code Segment Register (CS).
Reads and returns the current value of CS. This function is only available on
IA-32 and x64.
@return The current value of CS.
**/
UINT16
EFIAPI
AsmReadCs (
VOID
);
/**
Reads the current value of Data Segment Register (DS).
Reads and returns the current value of DS. This function is only available on
IA-32 and x64.
@return The current value of DS.
**/
UINT16
EFIAPI
AsmReadDs (
VOID
);
/**
Reads the current value of Extra Segment Register (ES).
Reads and returns the current value of ES. This function is only available on
IA-32 and x64.
@return The current value of ES.
**/
UINT16
EFIAPI
AsmReadEs (
VOID
);
/**
Reads the current value of FS Data Segment Register (FS).
Reads and returns the current value of FS. This function is only available on
IA-32 and x64.
@return The current value of FS.
**/
UINT16
EFIAPI
AsmReadFs (
VOID
);
/**
Reads the current value of GS Data Segment Register (GS).
Reads and returns the current value of GS. This function is only available on
IA-32 and x64.
@return The current value of GS.
**/
UINT16
EFIAPI
AsmReadGs (
VOID
);
/**
Reads the current value of Stack Segment Register (SS).
Reads and returns the current value of SS. This function is only available on
IA-32 and x64.
@return The current value of SS.
**/
UINT16
EFIAPI
AsmReadSs (
VOID
);
/**
Reads the current value of Task Register (TR).
Reads and returns the current value of TR. This function is only available on
IA-32 and x64.
@return The current value of TR.
**/
UINT16
EFIAPI
AsmReadTr (
VOID
);
/**
Reads the current Global Descriptor Table Register(GDTR) descriptor.
Reads and returns the current GDTR descriptor and returns it in Gdtr. This
function is only available on IA-32 and x64.
If Gdtr is NULL, then ASSERT().
@param Gdtr The pointer to a GDTR descriptor.
**/
VOID
EFIAPI
AsmReadGdtr (
OUT IA32_DESCRIPTOR *Gdtr
);
/**
Writes the current Global Descriptor Table Register (GDTR) descriptor.
Writes and the current GDTR descriptor specified by Gdtr. This function is
only available on IA-32 and x64.
If Gdtr is NULL, then ASSERT().
@param Gdtr The pointer to a GDTR descriptor.
**/
VOID
EFIAPI
AsmWriteGdtr (
IN CONST IA32_DESCRIPTOR *Gdtr
);
/**
Reads the current Interrupt Descriptor Table Register(IDTR) descriptor.
Reads and returns the current IDTR descriptor and returns it in Idtr. This
function is only available on IA-32 and x64.
If Idtr is NULL, then ASSERT().
@param Idtr The pointer to a IDTR descriptor.
**/
VOID
EFIAPI
AsmReadIdtr (
OUT IA32_DESCRIPTOR *Idtr
);
/**
Writes the current Interrupt Descriptor Table Register(IDTR) descriptor.
Writes the current IDTR descriptor and returns it in Idtr. This function is
only available on IA-32 and x64.
If Idtr is NULL, then ASSERT().
@param Idtr The pointer to a IDTR descriptor.
**/
VOID
EFIAPI
AsmWriteIdtr (
IN CONST IA32_DESCRIPTOR *Idtr
);
/**
Reads the current Local Descriptor Table Register(LDTR) selector.
Reads and returns the current 16-bit LDTR descriptor value. This function is
only available on IA-32 and x64.
@return The current selector of LDT.
**/
UINT16
EFIAPI
AsmReadLdtr (
VOID
);
/**
Writes the current Local Descriptor Table Register (LDTR) selector.
Writes and the current LDTR descriptor specified by Ldtr. This function is
only available on IA-32 and x64.
@param Ldtr 16-bit LDTR selector value.
**/
VOID
EFIAPI
AsmWriteLdtr (
IN UINT16 Ldtr
);
/**
Save the current floating point/SSE/SSE2 context to a buffer.
Saves the current floating point/SSE/SSE2 state to the buffer specified by
Buffer. Buffer must be aligned on a 16-byte boundary. This function is only
available on IA-32 and x64.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 16-byte boundary, then ASSERT().
@param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
AsmFxSave (
OUT IA32_FX_BUFFER *Buffer
);
/**
Restores the current floating point/SSE/SSE2 context from a buffer.
Restores the current floating point/SSE/SSE2 state from the buffer specified
by Buffer. Buffer must be aligned on a 16-byte boundary. This function is
only available on IA-32 and x64.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 16-byte boundary, then ASSERT().
If Buffer was not saved with AsmFxSave(), then ASSERT().
@param Buffer The pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
AsmFxRestore (
IN CONST IA32_FX_BUFFER *Buffer
);
/**
Reads the current value of 64-bit MMX Register #0 (MM0).
Reads and returns the current value of MM0. This function is only available
on IA-32 and x64.
@return The current value of MM0.
**/
UINT64
EFIAPI
AsmReadMm0 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #1 (MM1).
Reads and returns the current value of MM1. This function is only available
on IA-32 and x64.
@return The current value of MM1.
**/
UINT64
EFIAPI
AsmReadMm1 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #2 (MM2).
Reads and returns the current value of MM2. This function is only available
on IA-32 and x64.
@return The current value of MM2.
**/
UINT64
EFIAPI
AsmReadMm2 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #3 (MM3).
Reads and returns the current value of MM3. This function is only available
on IA-32 and x64.
@return The current value of MM3.
**/
UINT64
EFIAPI
AsmReadMm3 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #4 (MM4).
Reads and returns the current value of MM4. This function is only available
on IA-32 and x64.
@return The current value of MM4.
**/
UINT64
EFIAPI
AsmReadMm4 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #5 (MM5).
Reads and returns the current value of MM5. This function is only available
on IA-32 and x64.
@return The current value of MM5.
**/
UINT64
EFIAPI
AsmReadMm5 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #6 (MM6).
Reads and returns the current value of MM6. This function is only available
on IA-32 and x64.
@return The current value of MM6.
**/
UINT64
EFIAPI
AsmReadMm6 (
VOID
);
/**
Reads the current value of 64-bit MMX Register #7 (MM7).
Reads and returns the current value of MM7. This function is only available
on IA-32 and x64.
@return The current value of MM7.
**/
UINT64
EFIAPI
AsmReadMm7 (
VOID
);
/**
Writes the current value of 64-bit MMX Register #0 (MM0).
Writes the current value of MM0. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM0.
**/
VOID
EFIAPI
AsmWriteMm0 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #1 (MM1).
Writes the current value of MM1. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM1.
**/
VOID
EFIAPI
AsmWriteMm1 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #2 (MM2).
Writes the current value of MM2. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM2.
**/
VOID
EFIAPI
AsmWriteMm2 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #3 (MM3).
Writes the current value of MM3. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM3.
**/
VOID
EFIAPI
AsmWriteMm3 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #4 (MM4).
Writes the current value of MM4. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM4.
**/
VOID
EFIAPI
AsmWriteMm4 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #5 (MM5).
Writes the current value of MM5. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM5.
**/
VOID
EFIAPI
AsmWriteMm5 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #6 (MM6).
Writes the current value of MM6. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM6.
**/
VOID
EFIAPI
AsmWriteMm6 (
IN UINT64 Value
);
/**
Writes the current value of 64-bit MMX Register #7 (MM7).
Writes the current value of MM7. This function is only available on IA32 and
x64.
@param Value The 64-bit value to write to MM7.
**/
VOID
EFIAPI
AsmWriteMm7 (
IN UINT64 Value
);
/**
Reads the current value of Time Stamp Counter (TSC).
Reads and returns the current value of TSC. This function is only available
on IA-32 and x64.
@return The current value of TSC
**/
UINT64
EFIAPI
AsmReadTsc (
VOID
);
/**
Reads the current value of a Performance Counter (PMC).
Reads and returns the current value of performance counter specified by
Index. This function is only available on IA-32 and x64.
@param Index The 32-bit Performance Counter index to read.
@return The value of the PMC specified by Index.
**/
UINT64
EFIAPI
AsmReadPmc (
IN UINT32 Index
);
/**
Sets up a monitor buffer that is used by AsmMwait().
Executes a MONITOR instruction with the register state specified by Eax, Ecx
and Edx. Returns Eax. This function is only available on IA-32 and x64.
@param Eax The value to load into EAX or RAX before executing the MONITOR
instruction.
@param Ecx The value to load into ECX or RCX before executing the MONITOR
instruction.
@param Edx The value to load into EDX or RDX before executing the MONITOR
instruction.
@return Eax
**/
UINTN
EFIAPI
AsmMonitor (
IN UINTN Eax,
IN UINTN Ecx,
IN UINTN Edx
);
/**
Executes an MWAIT instruction.
Executes an MWAIT instruction with the register state specified by Eax and
Ecx. Returns Eax. This function is only available on IA-32 and x64.
@param Eax The value to load into EAX or RAX before executing the MONITOR
instruction.
@param Ecx The value to load into ECX or RCX before executing the MONITOR
instruction.
@return Eax
**/
UINTN
EFIAPI
AsmMwait (
IN UINTN Eax,
IN UINTN Ecx
);
/**
Executes a WBINVD instruction.
Executes a WBINVD instruction. This function is only available on IA-32 and
x64.
**/
VOID
EFIAPI
AsmWbinvd (
VOID
);
/**
Executes a INVD instruction.
Executes a INVD instruction. This function is only available on IA-32 and
x64.
**/
VOID
EFIAPI
AsmInvd (
VOID
);
/**
Flushes a cache line from all the instruction and data caches within the
coherency domain of the CPU.
Flushed the cache line specified by LinearAddress, and returns LinearAddress.
This function is only available on IA-32 and x64.
@param LinearAddress The address of the cache line to flush. If the CPU is
in a physical addressing mode, then LinearAddress is a
physical address. If the CPU is in a virtual
addressing mode, then LinearAddress is a virtual
address.
@return LinearAddress.
**/
VOID *
EFIAPI
AsmFlushCacheLine (
IN VOID *LinearAddress
);
/**
Enables the 32-bit paging mode on the CPU.
Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables
must be properly initialized prior to calling this service. This function
assumes the current execution mode is 32-bit protected mode. This function is
only available on IA-32. After the 32-bit paging mode is enabled, control is
transferred to the function specified by EntryPoint using the new stack
specified by NewStack and passing in the parameters specified by Context1 and
Context2. Context1 and Context2 are optional and may be NULL. The function
EntryPoint must never return.
If the current execution mode is not 32-bit protected mode, then ASSERT().
If EntryPoint is NULL, then ASSERT().
If NewStack is NULL, then ASSERT().
There are a number of constraints that must be followed before calling this
function:
1) Interrupts must be disabled.
2) The caller must be in 32-bit protected mode with flat descriptors. This
means all descriptors must have a base of 0 and a limit of 4GB.
3) CR0 and CR4 must be compatible with 32-bit protected mode with flat
descriptors.
4) CR3 must point to valid page tables that will be used once the transition
is complete, and those page tables must guarantee that the pages for this
function and the stack are identity mapped.
@param EntryPoint A pointer to function to call with the new stack after
paging is enabled.
@param Context1 A pointer to the context to pass into the EntryPoint
function as the first parameter after paging is enabled.
@param Context2 A pointer to the context to pass into the EntryPoint
function as the second parameter after paging is enabled.
@param NewStack A pointer to the new stack to use for the EntryPoint
function after paging is enabled.
**/
VOID
EFIAPI
AsmEnablePaging32 (
IN SWITCH_STACK_ENTRY_POINT EntryPoint,
IN VOID *Context1 OPTIONAL,
IN VOID *Context2 OPTIONAL,
IN VOID *NewStack
);
/**
Disables the 32-bit paging mode on the CPU.
Disables the 32-bit paging mode on the CPU and returns to 32-bit protected
mode. This function assumes the current execution mode is 32-paged protected
mode. This function is only available on IA-32. After the 32-bit paging mode
is disabled, control is transferred to the function specified by EntryPoint
using the new stack specified by NewStack and passing in the parameters
specified by Context1 and Context2. Context1 and Context2 are optional and
may be NULL. The function EntryPoint must never return.
If the current execution mode is not 32-bit paged mode, then ASSERT().
If EntryPoint is NULL, then ASSERT().
If NewStack is NULL, then ASSERT().
There are a number of constraints that must be followed before calling this
function:
1) Interrupts must be disabled.
2) The caller must be in 32-bit paged mode.
3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode.
4) CR3 must point to valid page tables that guarantee that the pages for
this function and the stack are identity mapped.
@param EntryPoint A pointer to function to call with the new stack after
paging is disabled.
@param Context1 A pointer to the context to pass into the EntryPoint
function as the first parameter after paging is disabled.
@param Context2 A pointer to the context to pass into the EntryPoint
function as the second parameter after paging is
disabled.
@param NewStack A pointer to the new stack to use for the EntryPoint
function after paging is disabled.
**/
VOID
EFIAPI
AsmDisablePaging32 (
IN SWITCH_STACK_ENTRY_POINT EntryPoint,
IN VOID *Context1 OPTIONAL,
IN VOID *Context2 OPTIONAL,
IN VOID *NewStack
);
/**
Enables the 64-bit paging mode on the CPU.
Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables
must be properly initialized prior to calling this service. This function
assumes the current execution mode is 32-bit protected mode with flat
descriptors. This function is only available on IA-32. After the 64-bit
paging mode is enabled, control is transferred to the function specified by
EntryPoint using the new stack specified by NewStack and passing in the
parameters specified by Context1 and Context2. Context1 and Context2 are
optional and may be 0. The function EntryPoint must never return.
If the current execution mode is not 32-bit protected mode with flat
descriptors, then ASSERT().
If EntryPoint is 0, then ASSERT().
If NewStack is 0, then ASSERT().
@param Cs The 16-bit selector to load in the CS before EntryPoint
is called. The descriptor in the GDT that this selector
references must be setup for long mode.
@param EntryPoint The 64-bit virtual address of the function to call with
the new stack after paging is enabled.
@param Context1 The 64-bit virtual address of the context to pass into
the EntryPoint function as the first parameter after
paging is enabled.
@param Context2 The 64-bit virtual address of the context to pass into
the EntryPoint function as the second parameter after
paging is enabled.
@param NewStack The 64-bit virtual address of the new stack to use for
the EntryPoint function after paging is enabled.
**/
VOID
EFIAPI
AsmEnablePaging64 (
IN UINT16 Cs,
IN UINT64 EntryPoint,
IN UINT64 Context1 OPTIONAL,
IN UINT64 Context2 OPTIONAL,
IN UINT64 NewStack
);
/**
Disables the 64-bit paging mode on the CPU.
Disables the 64-bit paging mode on the CPU and returns to 32-bit protected
mode. This function assumes the current execution mode is 64-paging mode.
This function is only available on x64. After the 64-bit paging mode is
disabled, control is transferred to the function specified by EntryPoint
using the new stack specified by NewStack and passing in the parameters
specified by Context1 and Context2. Context1 and Context2 are optional and
may be 0. The function EntryPoint must never return.
If the current execution mode is not 64-bit paged mode, then ASSERT().
If EntryPoint is 0, then ASSERT().
If NewStack is 0, then ASSERT().
@param Cs The 16-bit selector to load in the CS before EntryPoint
is called. The descriptor in the GDT that this selector
references must be setup for 32-bit protected mode.
@param EntryPoint The 64-bit virtual address of the function to call with
the new stack after paging is disabled.
@param Context1 The 64-bit virtual address of the context to pass into
the EntryPoint function as the first parameter after
paging is disabled.
@param Context2 The 64-bit virtual address of the context to pass into
the EntryPoint function as the second parameter after
paging is disabled.
@param NewStack The 64-bit virtual address of the new stack to use for
the EntryPoint function after paging is disabled.
**/
VOID
EFIAPI
AsmDisablePaging64 (
IN UINT16 Cs,
IN UINT32 EntryPoint,
IN UINT32 Context1 OPTIONAL,
IN UINT32 Context2 OPTIONAL,
IN UINT32 NewStack
);
//
// 16-bit thunking services
//
/**
Retrieves the properties for 16-bit thunk functions.
Computes the size of the buffer and stack below 1MB required to use the
AsmPrepareThunk16(), AsmThunk16() and AsmPrepareAndThunk16() functions. This
buffer size is returned in RealModeBufferSize, and the stack size is returned
in ExtraStackSize. If parameters are passed to the 16-bit real mode code,
then the actual minimum stack size is ExtraStackSize plus the maximum number
of bytes that need to be passed to the 16-bit real mode code.
If RealModeBufferSize is NULL, then ASSERT().
If ExtraStackSize is NULL, then ASSERT().
@param RealModeBufferSize A pointer to the size of the buffer below 1MB
required to use the 16-bit thunk functions.
@param ExtraStackSize A pointer to the extra size of stack below 1MB
that the 16-bit thunk functions require for
temporary storage in the transition to and from
16-bit real mode.
**/
VOID
EFIAPI
AsmGetThunk16Properties (
OUT UINT32 *RealModeBufferSize,
OUT UINT32 *ExtraStackSize
);
/**
Prepares all structures a code required to use AsmThunk16().
Prepares all structures and code required to use AsmThunk16().
This interface is limited to be used in either physical mode or virtual modes with paging enabled where the
virtual to physical mappings for ThunkContext.RealModeBuffer is mapped 1:1.
If ThunkContext is NULL, then ASSERT().
@param ThunkContext A pointer to the context structure that describes the
16-bit real mode code to call.
**/
VOID
EFIAPI
AsmPrepareThunk16 (
IN OUT THUNK_CONTEXT *ThunkContext
);
/**
Transfers control to a 16-bit real mode entry point and returns the results.
Transfers control to a 16-bit real mode entry point and returns the results.
AsmPrepareThunk16() must be called with ThunkContext before this function is used.
This function must be called with interrupts disabled.
The register state from the RealModeState field of ThunkContext is restored just prior
to calling the 16-bit real mode entry point. This includes the EFLAGS field of RealModeState,
which is used to set the interrupt state when a 16-bit real mode entry point is called.
Control is transferred to the 16-bit real mode entry point specified by the CS and Eip fields of RealModeState.
The stack is initialized to the SS and ESP fields of RealModeState. Any parameters passed to
the 16-bit real mode code must be populated by the caller at SS:ESP prior to calling this function.
The 16-bit real mode entry point is invoked with a 16-bit CALL FAR instruction,
so when accessing stack contents, the 16-bit real mode code must account for the 16-bit segment
and 16-bit offset of the return address that were pushed onto the stack. The 16-bit real mode entry
point must exit with a RETF instruction. The register state is captured into RealModeState immediately
after the RETF instruction is executed.
If EFLAGS specifies interrupts enabled, or any of the 16-bit real mode code enables interrupts,
or any of the 16-bit real mode code makes a SW interrupt, then the caller is responsible for making sure
the IDT at address 0 is initialized to handle any HW or SW interrupts that may occur while in 16-bit real mode.
If EFLAGS specifies interrupts enabled, or any of the 16-bit real mode code enables interrupts,
then the caller is responsible for making sure the 8259 PIC is in a state compatible with 16-bit real mode.
This includes the base vectors, the interrupt masks, and the edge/level trigger mode.
If THUNK_ATTRIBUTE_BIG_REAL_MODE is set in the ThunkAttributes field of ThunkContext, then the user code
is invoked in big real mode. Otherwise, the user code is invoked in 16-bit real mode with 64KB segment limits.
If neither THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 nor THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL are set in
ThunkAttributes, then it is assumed that the user code did not enable the A20 mask, and no attempt is made to
disable the A20 mask.
If THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 is set and THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL is clear in
ThunkAttributes, then attempt to use the INT 15 service to disable the A20 mask. If this INT 15 call fails,
then attempt to disable the A20 mask by directly accessing the 8042 keyboard controller I/O ports.
If THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 is clear and THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL is set in
ThunkAttributes, then attempt to disable the A20 mask by directly accessing the 8042 keyboard controller I/O ports.
If ThunkContext is NULL, then ASSERT().
If AsmPrepareThunk16() was not previously called with ThunkContext, then ASSERT().
If both THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15 and THUNK_ATTRIBUTE_DISABLE_A20_MASK_KBD_CTRL are set in
ThunkAttributes, then ASSERT().
This interface is limited to be used in either physical mode or virtual modes with paging enabled where the
virtual to physical mappings for ThunkContext.RealModeBuffer are mapped 1:1.
@param ThunkContext A pointer to the context structure that describes the
16-bit real mode code to call.
**/
VOID
EFIAPI
AsmThunk16 (
IN OUT THUNK_CONTEXT *ThunkContext
);
/**
Prepares all structures and code for a 16-bit real mode thunk, transfers
control to a 16-bit real mode entry point, and returns the results.
Prepares all structures and code for a 16-bit real mode thunk, transfers
control to a 16-bit real mode entry point, and returns the results. If the
caller only need to perform a single 16-bit real mode thunk, then this
service should be used. If the caller intends to make more than one 16-bit
real mode thunk, then it is more efficient if AsmPrepareThunk16() is called
once and AsmThunk16() can be called for each 16-bit real mode thunk.
This interface is limited to be used in either physical mode or virtual modes with paging enabled where the
virtual to physical mappings for ThunkContext.RealModeBuffer is mapped 1:1.
See AsmPrepareThunk16() and AsmThunk16() for the detailed description and ASSERT() conditions.
@param ThunkContext A pointer to the context structure that describes the
16-bit real mode code to call.
**/
VOID
EFIAPI
AsmPrepareAndThunk16 (
IN OUT THUNK_CONTEXT *ThunkContext
);
/**
Generates a 16-bit random number through RDRAND instruction.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
AsmRdRand16 (
OUT UINT16 *Rand
);
/**
Generates a 32-bit random number through RDRAND instruction.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
AsmRdRand32 (
OUT UINT32 *Rand
);
/**
Generates a 64-bit random number through RDRAND instruction.
if Rand is NULL, then ASSERT().
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
AsmRdRand64 (
OUT UINT64 *Rand
);
/**
Load given selector into TR register.
@param[in] Selector Task segment selector
**/
VOID
EFIAPI
AsmWriteTr (
IN UINT16 Selector
);
/**
Performs a serializing operation on all load-from-memory instructions that
were issued prior the AsmLfence function.
Executes a LFENCE instruction. This function is only available on IA-32 and x64.
**/
VOID
EFIAPI
AsmLfence (
VOID
);
/**
Executes a XGETBV instruction
Executes a XGETBV instruction. This function is only available on IA-32 and
x64.
@param[in] Index Extended control register index
@return The current value of the extended control register
**/
UINT64
EFIAPI
AsmXGetBv (
IN UINT32 Index
);
/**
Executes a XSETBV instruction to write a 64-bit value to a Extended Control
Register(XCR), and returns the value.
Writes the 64-bit value specified by Value to the XCR specified by Index. The
64-bit value written to the XCR is returned. No parameter checking is
performed on Index or Value, and some of these may cause CPU exceptions. The
caller must either guarantee that Index and Value are valid, or the caller
must establish proper exception handlers. This function is only available on
IA-32 and x64.
@param Index The 32-bit XCR index to write.
@param Value The 64-bit value to write to the XCR.
@return Value
**/
UINT64
EFIAPI
AsmXSetBv (
IN UINT32 Index,
IN UINT64 Value
);
/**
Executes a VMGEXIT instruction (VMMCALL with a REP prefix)
Executes a VMGEXIT instruction. This function is only available on IA-32 and
x64.
**/
VOID
EFIAPI
AsmVmgExit (
VOID
);
///
/// The structure used to supply and return data to and from the SVSM.
///
typedef struct {
VOID *Caa;
UINT64 RaxIn;
UINT64 RcxIn;
UINT64 RdxIn;
UINT64 R8In;
UINT64 R9In;
UINT64 RaxOut;
UINT64 RcxOut;
UINT64 RdxOut;
UINT64 R8Out;
UINT64 R9Out;
UINT8 *CallPending;
} SVSM_CALL_DATA;
/**
Executes a VMGEXIT instruction (VMMCALL with a REP prefix) with arguments
and return code
Executes a VMGEXIT instruction placing the specified arguments in the
corresponding registers before invocation. Upon return an XCHG is done to
atomically clear and retrieve the SVSM call pending value. The returned RAX
register value becomes the function return code. This function is intended
for use with an SVSM. This function is only available on IA-32 and x64.
@param[in,out] SvsmCallPending Pointer to the location of the SVSM call data
@return Value of the RAX register on return
**/
UINT32
EFIAPI
AsmVmgExitSvsm (
IN OUT SVSM_CALL_DATA *SvsmCallData
);
/**
Patch the immediate operand of an IA32 or X64 instruction such that the byte,
word, dword or qword operand is encoded at the end of the instruction's
binary representation.
This function should be used to update object code that was compiled with
NASM from assembly source code. Example:
NASM source code:
mov eax, strict dword 0 ; the imm32 zero operand will be patched
ASM_PFX(gPatchCr3):
mov cr3, eax
C source code:
X86_ASSEMBLY_PATCH_LABEL gPatchCr3;
PatchInstructionX86 (gPatchCr3, AsmReadCr3 (), 4);
@param[out] InstructionEnd Pointer right past the instruction to patch. The
immediate operand to patch is expected to
comprise the trailing bytes of the instruction.
If InstructionEnd is closer to address 0 than
ValueSize permits, then ASSERT().
@param[in] PatchValue The constant to write to the immediate operand.
The caller is responsible for ensuring that
PatchValue can be represented in the byte, word,
dword or qword operand (as indicated through
ValueSize); otherwise ASSERT().
@param[in] ValueSize The size of the operand in bytes; must be 1, 2,
4, or 8. ASSERT() otherwise.
**/
VOID
EFIAPI
PatchInstructionX86 (
OUT X86_ASSEMBLY_PATCH_LABEL *InstructionEnd,
IN UINT64 PatchValue,
IN UINTN ValueSize
);
#endif // defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
#endif // !defined (__BASE_LIB__)
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