mirror of https://github.com/acidanthera/audk.git
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
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/** @file
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PEI Services Table Pointer Library for PEI Core.
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This library is used for PEI Core which does executed from flash device directly but
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executed in memory. When the PEI Core does a Set of the PEI Service table pointer
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a PPI is reinstalled so that PEIMs can update the copy of the PEI Services table
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they have cached.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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Portiions copyrigth (c) 2011, Apple Inc. All rights reserved.
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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/PeiServicesTablePointerLib.h>
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#include <Library/DebugLib.h>
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#include <Ppi/EmuPeiServicesTableUpdate.h>
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CONST EFI_PEI_SERVICES **gPeiServices = NULL;
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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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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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EFI_STATUS Status;
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EFI_PEI_PPI_DESCRIPTOR *PpiDescriptor;
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VOID *NotUsed;
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gPeiServices = PeiServicesTablePointer;
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Status = (*PeiServicesTablePointer)->LocatePpi (
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PeiServicesTablePointer,
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&gEmuPeiServicesTableUpdatePpiGuid, // GUID
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0, // INSTANCE
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&PpiDescriptor, // EFI_PEI_PPI_DESCRIPTOR
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&NotUsed // PPI
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);
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if (!EFI_ERROR (Status)) {
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//
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// Standard PI Mechanism is to use negative offset from IDT.
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// We can't do that in the emulator, so we make up a constant location
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// that every one can use. The first try may fail as the PEI Core is still
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// initializing its self, but that is OK.
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//
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// Reinstall PPI to consumers know to update PEI Services pointer
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Status = (*PeiServicesTablePointer)->ReInstallPpi (
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PeiServicesTablePointer,
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PpiDescriptor,
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PpiDescriptor
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);
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}
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}
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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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ASSERT (gPeiServices != NULL);
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ASSERT (*gPeiServices != NULL);
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return gPeiServices;
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}
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