mirror of https://github.com/acidanthera/audk.git
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/** @file
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PEI Services Table Pointer Library.
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This library is used for PEIM which does executed from flash device directly but
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executed in memory.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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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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CONST EFI_PEI_SERVICES **gPeiServices;
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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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ASSERT (PeiServicesTablePointer != NULL);
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gPeiServices = PeiServicesTablePointer;
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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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return gPeiServices;
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}
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/**
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The constructor function caches the pointer to PEI services.
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The constructor function caches the pointer to PEI services.
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It will always return EFI_SUCCESS.
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@param FileHandle The handle of FFS header the loaded driver.
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@param PeiServices The pointer to the PEI services.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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PeiServicesTablePointerLibConstructor (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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gPeiServices = PeiServices;
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return EFI_SUCCESS;
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}
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/**
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Perform CPU specific actions required to migrate the PEI Services Table
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pointer from temporary RAM to permanent RAM.
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For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes
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immediately preceding the Interrupt Descriptor Table (IDT) in memory.
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For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes
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immediately preceding the Interrupt Descriptor Table (IDT) in memory.
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For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
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a dedicated CPU register. This means that there is no memory storage
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associated with storing the PEI Services Table pointer, so no additional
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migration actions are required for Itanium or ARM CPUs.
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**/
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VOID
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EFIAPI
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MigratePeiServicesTablePointer (
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VOID
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)
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{
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//
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// PEI Services Table pointer is cached in the global variable. No additional
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// migration actions are required.
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//
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return;
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}
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