audk/MdePkg/Library/BaseLib/BaseLibInternals.h

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/** @file
Declaration of internal functions in BaseLib.
Copyright (c) 2006, Intel Corporation<BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name: BaseLibInternals.h
**/
#ifndef __BASE_LIB_INTERNALS__
#define __BASE_LIB_INTERNALS__
//
// Math functions
//
/**
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.
@param Operand The 64-bit operand to shift left.
@param Count The number of bits to shift left.
@return Operand << Count
**/
UINT64
EFIAPI
InternalMathLShiftU64 (
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.
@param Operand The 64-bit operand to shift right.
@param Count The number of bits to shift right.
@return Operand >> Count
**/
UINT64
EFIAPI
InternalMathRShiftU64 (
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.
@param Operand The 64-bit operand to shift right.
@param Count The number of bits to shift right.
@return Operand arithmetically shifted right by Count
**/
UINT64
EFIAPI
InternalMathARShiftU64 (
IN UINT64 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.
@param Operand The 64-bit operand to rotate left.
@param Count The number of bits to rotate left.
@return Operand <<< Count
**/
UINT64
EFIAPI
InternalMathLRotU64 (
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.
@param Operand The 64-bit operand to rotate right.
@param Count The number of bits to rotate right.
@return Operand >>> Count
**/
UINT64
EFIAPI
InternalMathRRotU64 (
IN UINT64 Operand,
IN UINTN Count
);
/**
Switches the endianess 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 Operand A 64-bit unsigned value.
@return The byte swaped Operand.
**/
UINT64
EFIAPI
InternalMathSwapBytes64 (
IN UINT64 Operand
);
/**
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
InternalMathMultU64x32 (
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
InternalMathMultU64x64 (
IN UINT64 Multiplicand,
IN UINT64 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.
@param Dividend A 64-bit unsigned value.
@param Divisor A 32-bit unsigned value.
@return Dividend / Divisor
**/
UINT64
EFIAPI
InternalMathDivU64x32 (
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.
@param Dividend A 64-bit unsigned value.
@param Divisor A 32-bit unsigned value.
@return Dividend % Divisor
**/
UINT32
EFIAPI
InternalMathModU64x32 (
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.
@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
InternalMathDivRemU64x32 (
IN UINT64 Dividend,
IN UINT32 Divisor,
OUT UINT32 *Remainder
);
/**
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.
@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
InternalMathDivRemU64x64 (
IN UINT64 Dividend,
IN UINT64 Divisor,
OUT UINT64 *Remainder
);
/**
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 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.
@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
InternalMathDivRemS64x64 (
IN INT64 Dividend,
IN INT64 Divisor,
OUT INT64 *Remainder OPTIONAL
);
/**
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.
@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.
**/
VOID
EFIAPI
InternalSwitchStack (
IN SWITCH_STACK_ENTRY_POINT EntryPoint,
IN VOID *Context1,
IN VOID *Context2,
IN VOID *NewStack
);
//
// Ia32 and x64 specific functions
//
/**
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.
@param Gdtr Pointer to a GDTR descriptor.
**/
VOID
EFIAPI
InternalX86ReadGdtr (
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.
@param Gdtr Pointer to a GDTR descriptor.
**/
VOID
EFIAPI
InternalX86WriteGdtr (
IN CONST IA32_DESCRIPTOR *Gdtr
);
/**
Reads the current Interrupt Descriptor Table Register(GDTR) descriptor.
Reads and returns the current IDTR descriptor and returns it in Idtr. This
function is only available on IA-32 and X64.
@param Idtr Pointer to a IDTR descriptor.
**/
VOID
EFIAPI
InternalX86ReadIdtr (
OUT IA32_DESCRIPTOR *Idtr
);
/**
Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.
Writes the current IDTR descriptor and returns it in Idtr. This function is
only available on IA-32 and X64.
@param Idtr Pointer to a IDTR descriptor.
**/
VOID
EFIAPI
InternalX86WriteIdtr (
IN CONST IA32_DESCRIPTOR *Idtr
);
/**
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.
@param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
InternalX86FxSave (
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.
@param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
InternalX86FxRestore (
IN CONST IA32_FX_BUFFER *Buffer
);
/**
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.
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
InternalX86EnablePaging32 (
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.
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
InternalX86DisablePaging32 (
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.
@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
InternalX86EnablePaging64 (
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.
@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
InternalX86DisablePaging64 (
IN UINT16 Cs,
IN UINT32 EntryPoint,
IN UINT32 Context1, OPTIONAL
IN UINT32 Context2, OPTIONAL
IN UINT32 NewStack
);
#endif