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/*++
Copyright (c) 2004 - 2006, 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:
PeiServicesTablePointer.c
Abstract:
PEI Services Table Pointer Library.
--*/
#include "EdkIIGluePeim.h"
/**
The function returns the pointer to PeiServices.
The function returns the pointer to PeiServices.
It will ASSERT() if the pointer to PeiServices is NULL.
@retval The pointer to PeiServices.
**/
EFI_PEI_SERVICES **
EFIAPI
GetPeiServicesTablePointer (
VOID
)
{
EFI_PEI_SERVICES **PeiServices;
#if (PI_SPECIFICATION_VERSION >= 0x00010000) //;;## ...AMI_OVERRIDE... Support PI1.x
IA32_DESCRIPTOR Idtr;
#endif
#if (PI_SPECIFICATION_VERSION < 0x00010000) //;;## ...AMI_OVERRIDE... Support PI1.x
PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadMm7 ();
#else
AsmReadIdtr (&Idtr);
PeiServices = (EFI_PEI_SERVICES **)(UINTN)(*(UINTN*)(Idtr.Base - sizeof (UINTN)));
#endif
if ((*PeiServices)->Hdr.Signature == PEI_SERVICES_SIGNATURE) {
return PeiServices;
} else {
PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadMm7 ();
ASSERT (PeiServices != NULL);
return PeiServices;
}
}
/**
The constructor function caches the pointer to PEI services.
The constructor function caches the pointer to PEI services.
It will always return EFI_SUCCESS.
@param FfsHeader Pointer to FFS header the loaded driver.
@param PeiServices Pointer to the PEI services.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
PeiServicesTablePointerLibConstructor (
IN EFI_FFS_FILE_HEADER *FfsHeader,
IN EFI_PEI_SERVICES **PeiServices
)
{
#if (PI_SPECIFICATION_VERSION < 0x00010000)
AsmWriteMm7 ((UINT64)(UINTN)PeiServices);
#endif
return EFI_SUCCESS;
}
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