mirror of https://github.com/acidanthera/audk.git
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/** @file
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PEI Services Table Pointer Library for IA-32 and X64.
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Copyright (c) 2006 - 2007, 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 "InternalPeiServicesTablePointer.h"
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/**
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The function returns the pointer to PeiServicee following
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PI1.0.
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For IA32, the four-bytes field immediately prior to new IDT
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base addres is used to save the EFI_PEI_SERVICES**.
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For x64, the eight-bytes field immediately prior to new IDT
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base addres is used to save the EFI_PEI_SERVICES**
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@retval The pointer to PeiServices.
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**/
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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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EFI_PEI_SERVICES **PeiServices;
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IA32_DESCRIPTOR Idtr;
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AsmReadIdtr (&Idtr);
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PeiServices = (EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - 4));
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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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The function returns the pointer to PeiServicee following
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PI1.0.
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For IA32, the four-bytes field immediately prior to new IDT
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base addres is used to save the EFI_PEI_SERVICES**.
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For x64, the eight-bytes field immediately prior to new IDT
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base addres is used to save the EFI_PEI_SERVICES**
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@retval The pointer to PeiServices.
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**/
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VOID
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EFIAPI
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SetPeiServicesTablePointer (
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EFI_PEI_SERVICES ** PeiServicesTablePointer
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)
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{
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IA32_DESCRIPTOR Idtr;
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AsmReadIdtr (&Idtr);
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(*(UINTN*)(Idtr.Base - 4)) = (UINTN)PeiServicesTablePointer;
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}
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/**
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After memory initialization in PEI phase, the IDT table in temporary memory should
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be migrated to memory, and the address of PeiServicesPointer also need to be updated
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immediately preceding the new IDT table.
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@param PeiServices The address of PeiServices pointer.
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**/
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VOID
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EFIAPI
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MigrateIdtTable (
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IN EFI_PEI_SERVICES **PeiServices
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)
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{
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UINTN Size;
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VOID *NewBase;
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EFI_STATUS Status;
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IA32_DESCRIPTOR Idtr;
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AsmReadIdtr (&Idtr);
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Size = sizeof(UINTN) + (Idtr.Limit + 1);
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Status = PeiServicesAllocatePool (Size, &NewBase);
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ASSERT_EFI_ERROR (Status);
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CopyMem ((VOID*)((UINTN)NewBase + sizeof(UINTN)), (VOID*)Idtr.Base, (Idtr.Limit + 1));
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Idtr.Base = (UINTN)NewBase + sizeof(UINTN);
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AsmWriteIdtr (&Idtr);
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SetPeiServicesTablePointer(PeiServices);
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}
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