audk/EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/ia32/PeiServicePointer.c

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/*++
Copyright (c) 2004 - 2007, Intel Corporation
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:
PeiServicePointer.c
Abstract:
--*/
#include "Tiano.h"
#include "PeiApi.h"
#include "PeiLib.h"
#if (PI_SPECIFICATION_VERSION >= 0x00010000)
#ifdef EFI_NT_EMULATOR
EFI_PEI_SERVICES **gPeiServices;
#endif
VOID
SetPeiServicesTablePointer (
IN EFI_PEI_SERVICES **PeiServices
)
/*++
Routine Description:
Save PeiService pointer so that it can be retrieved anywhere.
Arguments:
PeiServices - The direct pointer to PeiServiceTable.
PhyscialAddress - The physcial address of variable PeiServices.
Returns:
NONE
--*/
{
#ifdef EFI_NT_EMULATOR
//
// For NT32, set EFI_PEI_SERVICES** to global variable.
//
gPeiServices = PeiServices;
#else
//
// For X86 processor,the EFI_PEI_SERVICES** is stored in the
// 4 bytes immediately preceding the Interrupt Descriptor Table.
//
UINTN IdtBaseAddress;
IdtBaseAddress = (UINTN)ReadIdtBase();
*(UINTN*)(IdtBaseAddress - 4) = (UINTN)PeiServices;
#endif
}
EFI_PEI_SERVICES **
GetPeiServicesTablePointer (
VOID
)
/*++
Routine Description:
Get PeiService pointer.
Arguments:
NONE.
Returns:
The direct pointer to PeiServiceTable.
--*/
{
EFI_PEI_SERVICES **PeiServices;
#ifdef EFI_NT_EMULATOR
//
// For NT32, set EFI_PEI_SERVICES** to global variable.
//
PeiServices = gPeiServices;
#else
//
// For X86 processor,the EFI_PEI_SERVICES** is stored in the
// 4 bytes immediately preceding the Interrupt Descriptor Table.
//
UINTN IdtBaseAddress;
IdtBaseAddress = (UINTN)ReadIdtBase();
PeiServices = (EFI_PEI_SERVICES **)(UINTN)(*(UINTN*)(IdtBaseAddress - 4));
#endif
return PeiServices;
}
VOID
MigrateIdtTable (
IN EFI_PEI_SERVICES **PeiServices
)
/*++
Routine Description:
Migrate IDT from CAR to real memory where preceded with 4 bytes for
storing PeiService pointer.
Arguments:
PeiServices - The direct pointer to PeiServiceTable.
Returns:
NONE.
--*/
{
#ifndef EFI_NT_EMULATOR
UINT16 IdtEntrySize;
UINTN OldIdtBase;
UINTN Size;
VOID *NewIdtBase;
EFI_STATUS Status;
IdtEntrySize = ReadIdtLimit();
OldIdtBase = ReadIdtBase();
Size = sizeof(PEI_IDT_TABLE) + (IdtEntrySize + 1);
Status = (*PeiServices)->AllocatePool (PeiServices, Size, &NewIdtBase);
ASSERT_PEI_ERROR (PeiServices, Status);
(*PeiServices)->CopyMem ((VOID*)((UINTN)NewIdtBase + sizeof(PEI_IDT_TABLE)), (VOID*)OldIdtBase, (IdtEntrySize + 1));
SetIdtBase(((UINTN)NewIdtBase + sizeof(PEI_IDT_TABLE)), IdtEntrySize);
SetPeiServicesTablePointer(PeiServices);
#endif
}
#endif