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audk/MdePkg/Library/BaseLib/x86LowLevel.c

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/** @file
IA-32/x64 specific functions.
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: x86LowLevel.c
**/
#include "BaseLibInternals.h"
//
// Bit-wise MSR operations
//
/**
Reads a 64-bit MSR, performs a bitwise inclusive 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 inclusive 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
)
{
return (UINT32)AsmMsrOr64 (Index, 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
)
{
return (UINT32)AsmMsrAnd64 (Index, AndData);
}
/**
Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive 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 inclusive 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
)
{
return (UINT32)AsmMsrAndThenOr64 (Index, AndData, 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
)
{
return BitFieldRead32 (AsmReadMsr32 (Index), StartBit, 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. Extra left bits in Value 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().
@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
)
{
ASSERT (EndBit < sizeof (Value) * 8);
ASSERT (StartBit <= EndBit);
return (UINT32)AsmMsrBitFieldWrite64 (Index, StartBit, EndBit, 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 inclusive 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().
@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
)
{
ASSERT (EndBit < sizeof (OrData) * 8);
ASSERT (StartBit <= EndBit);
return (UINT32)AsmMsrBitFieldOr64 (Index, StartBit, EndBit, 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().
@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
)
{
ASSERT (EndBit < sizeof (AndData) * 8);
ASSERT (StartBit <= EndBit);
return (UINT32)AsmMsrBitFieldAnd64 (Index, StartBit, EndBit, AndData);
}
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a
bitwise inclusive 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 inclusive 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().
@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
)
{
ASSERT (EndBit < sizeof (AndData) * 8);
ASSERT (StartBit <= EndBit);
return (UINT32)AsmMsrBitFieldAndThenOr64 (
Index,
StartBit,
EndBit,
AndData,
OrData
);
}
/**
Reads a 64-bit MSR, performs a bitwise inclusive OR, and writes the result
back to the 64-bit MSR.
Reads the 64-bit MSR specified by Index, performs a bitwise inclusive 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
)
{
return AsmWriteMsr64 (Index, AsmReadMsr64 (Index) | 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
)
{
return AsmWriteMsr64 (Index, AsmReadMsr64 (Index) & AndData);
}
/**
Reads a 64-bit MSR, performs a bitwise AND followed by a bitwise inclusive
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 inclusive 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
)
{
return AsmWriteMsr64 (Index, (AsmReadMsr64 (Index) & AndData) | 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 written back to the MSR.
**/
UINT64
EFIAPI
AsmMsrBitFieldRead64 (
IN UINT32 Index,
IN UINTN StartBit,
IN UINTN EndBit
)
{
return BitFieldRead64 (AsmReadMsr64 (Index), StartBit, 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. Extra left bits in Value 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().
@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
)
{
return AsmWriteMsr64 (
Index,
BitFieldWrite64 (AsmReadMsr64 (Index), StartBit, EndBit, Value)
);
}
/**
Reads a bit field in a 64-bit MSR, performs a bitwise inclusive 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 inclusive 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().
@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
)
{
return AsmWriteMsr64 (
Index,
BitFieldOr64 (AsmReadMsr64 (Index), StartBit, EndBit, 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().
@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
)
{
return AsmWriteMsr64 (
Index,
BitFieldAnd64 (AsmReadMsr64 (Index), StartBit, EndBit, AndData)
);
}
/**
Reads a bit field in a 64-bit MSR, performs a bitwise AND followed by a
bitwise inclusive 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 inclusive 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().
@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
)
{
return AsmWriteMsr64 (
Index,
BitFieldAndThenOr64 (
AsmReadMsr64 (Index),
StartBit,
EndBit,
AndData,
OrData
)
);
}
//
// Base Library CPU Functions
//
/**
Retrieves the current CPU interrupt state.
Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
currently enabled. Otherwise returns FALSE.
@retval TRUE CPU interrupts are enabled.
@retval FALSE CPU interrupts are disabled.
**/
BOOLEAN
EFIAPI
GetInterruptState (
VOID
)
{
IA32_EFLAGS32 EFlags;
EFlags.UintN = AsmReadEflags ();
return (BOOLEAN)(EFlags.Bits.IF == 1);
}
//
// 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.
If Gdtr is NULL, then ASSERT().
@param Gdtr Pointer to a GDTR descriptor.
**/
VOID
EFIAPI
AsmReadGdtr (
OUT IA32_DESCRIPTOR *Gdtr
)
{
ASSERT (Gdtr != NULL);
InternalX86ReadGdtr (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 Pointer to a GDTR descriptor.
**/
VOID
EFIAPI
AsmWriteGdtr (
IN CONST IA32_DESCRIPTOR *Gdtr
)
{
ASSERT (Gdtr != NULL);
InternalX86WriteGdtr (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.
If Idtr is NULL, then ASSERT().
@param Idtr Pointer to a IDTR descriptor.
**/
VOID
EFIAPI
AsmReadIdtr (
OUT IA32_DESCRIPTOR *Idtr
)
{
ASSERT (Idtr != NULL);
InternalX86ReadIdtr (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.
If Idtr is NULL, then ASSERT().
@param Idtr Pointer to a IDTR descriptor.
**/
VOID
EFIAPI
AsmWriteIdtr (
IN CONST IA32_DESCRIPTOR *Idtr
)
{
ASSERT (Idtr != NULL);
InternalX86WriteIdtr (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.
If Buffer is NULL, then ASSERT().
If Buffer is not aligned on a 16-byte boundary, then ASSERT().
@param Buffer Pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
AsmFxSave (
OUT IA32_FX_BUFFER *Buffer
)
{
ASSERT (Buffer != NULL);
ASSERT (((UINTN)Buffer & 0xf) == 0);
InternalX86FxSave (Buffer);
//
// Mark one flag at end of Buffer, it will be check by AsmFxRestor()
//
*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) = 0xAA5555AA;
}
/**
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 Pointer to a buffer to save the floating point/SSE/SSE2 context.
**/
VOID
EFIAPI
AsmFxRestore (
IN CONST IA32_FX_BUFFER *Buffer
)
{
ASSERT (Buffer != NULL);
ASSERT (((UINTN)Buffer & 0xf) == 0);
//
// Check the flag recorded by AsmFxSave()
//
ASSERT (*(UINT32 *) (&Buffer[sizeof (IA32_FX_BUFFER) - 4]) == 0xAA5555AA);
InternalX86FxRestore (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.
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
)
{
ASSERT (EntryPoint != NULL);
ASSERT (NewStack != NULL);
InternalX86EnablePaging32 (EntryPoint, Context1, Context2, 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
)
{
ASSERT (EntryPoint != NULL);
ASSERT (NewStack != NULL);
InternalX86DisablePaging32 (EntryPoint, Context1, Context2, 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
)
{
ASSERT (EntryPoint != 0);
ASSERT (NewStack != 0);
InternalX86EnablePaging64 (Cs, EntryPoint, Context1, Context2, 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
)
{
ASSERT (EntryPoint != 0);
ASSERT (NewStack != 0);
InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
}
//
// x86 version of MemoryFence()
//
/**
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
)
{
}
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