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126 lines
3.8 KiB
C
126 lines
3.8 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 - 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/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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/**
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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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/**
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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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If The cached PEI Services Table pointer is NULL, then ASSERT().
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If the permanent memory is allocated failed, then ASSERT().
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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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EFI_STATUS Status;
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IA32_DESCRIPTOR Idtr;
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EFI_PHYSICAL_ADDRESS IdtBase;
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CONST EFI_PEI_SERVICES **PeiServices;
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//
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// Get PEI Services Table pointer
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//
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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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//
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// Allocate the permanent memory.
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//
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Status = (*PeiServices)->AllocatePages (
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PeiServices,
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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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ASSERT_EFI_ERROR (Status);
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//
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// Idt table needs to be migrated into memory.
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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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return;
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}
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