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fcfd5fb01b
Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14846 6f19259b-4bc3-4df7-8a09-765794883524
112 lines
4.0 KiB
C
112 lines
4.0 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 - 2013, Intel Corporation. All rights reserved.<BR>
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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/BaseLib.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Ppi/TemporaryRamSupport.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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EFI_PHYSICAL_ADDRESS IdtBase;
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EFI_STATUS Status;
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EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI *TemporaryRamSupportPpi;
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ASSERT (PeiServicesTablePointer != NULL);
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AsmReadIdtr (&Idtr);
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if ((*(UINTN*)(Idtr.Base - sizeof (UINTN))) != (UINTN)PeiServicesTablePointer) {
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(*(UINTN*)(Idtr.Base - sizeof (UINTN))) = (UINTN)PeiServicesTablePointer;
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Status = (*PeiServicesTablePointer)->LocatePpi (
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PeiServicesTablePointer,
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&gEfiTemporaryRamSupportPpiGuid,
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0,
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NULL,
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(VOID**)&TemporaryRamSupportPpi
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);
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if (EFI_ERROR (Status)) {
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//
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// If TemporaryRamSupportPpi is not found, Idt table needs to be migrated into memory.
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//
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Status = (*PeiServicesTablePointer)->AllocatePages (
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PeiServicesTablePointer,
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EfiBootServicesCode,
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EFI_SIZE_TO_PAGES(Idtr.Limit + 1 + sizeof (UINTN)),
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&IdtBase
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);
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if (!EFI_ERROR (Status)) {
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//
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// Migrate Idt table
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//
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CopyMem ((VOID *) (UINTN) IdtBase, (VOID *) (Idtr.Base - sizeof (UINTN)), Idtr.Limit + 1 + sizeof (UINTN));
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Idtr.Base = (UINTN) IdtBase + sizeof (UINTN);
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AsmWriteIdtr (&Idtr);
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}
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}
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}
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}
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