mirror of https://github.com/acidanthera/audk.git
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/** @file
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PEI Services Table Pointer Library for IA-32 and x64.
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According to PI specification, the peiservice pointer is stored prior at IDT
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table in IA32 and x64 architecture.
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Copyright (c) 2006 - 2008, Intel Corporation.<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiPei.h>
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#include <Library/BaseLib.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Library/DebugLib.h>
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/**
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Retrieves the cached value of the PEI Services Table pointer.
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Returns the cached value of the PEI Services Table pointer in a CPU specific manner
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as specified in the CPU binding section of the Platform Initialization Pre-EFI
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Initialization Core Interface Specification.
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If the cached PEI Services Table pointer is NULL, then ASSERT().
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@return The pointer to PeiServices.
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**/
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CONST EFI_PEI_SERVICES **
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EFIAPI
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GetPeiServicesTablePointer (
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VOID
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)
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{
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CONST EFI_PEI_SERVICES **PeiServices;
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IA32_DESCRIPTOR Idtr;
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AsmReadIdtr (&Idtr);
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PeiServices = (CONST EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - sizeof (UINTN)));
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ASSERT (PeiServices != NULL);
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return PeiServices;
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}
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/**
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Caches a pointer PEI Services Table.
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Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
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in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
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Pre-EFI Initialization Core Interface Specification.
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The function set the pointer of PEI services immediately preceding the IDT table
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according to PI specification.
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If PeiServicesTablePointer is NULL, then ASSERT().
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@param PeiServicesTablePointer The address of PeiServices pointer.
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**/
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VOID
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EFIAPI
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SetPeiServicesTablePointer (
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IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
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)
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{
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IA32_DESCRIPTOR Idtr;
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ASSERT (PeiServicesTablePointer != NULL);
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AsmReadIdtr (&Idtr);
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(*(UINTN*)(Idtr.Base - sizeof (UINTN))) = (UINTN)PeiServicesTablePointer;
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}
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