51fcd2023b
This patch just separates the smbase relocation logic from PiSmmCpuDxeSmm driver, and moves to the SmmRelocationInit interface. It maintains the original implementation of most functions and leaves the definitions of global variables intact. Further refinements to the code are planned for subsequent patches. Platform shall consume the interface for the smbase relocation if need SMM support. Note: Before using SmmRelocationLib, the PiSmmCpuDxeSmm driver allocates the SMRAM to be used for SMI handler and Save state area of each processor from Smst->AllocatePages(). With SmmRelocationLib, the SMRAM allocation for SMI handlers and Save state areas is moved to early PEI phase (Smst->AllocatePages() service is not available). So, the allocation is done by splitting the SMRAM out of the SMRAM regions reported from gEfiSmmSMramMemoryGuid. So, Platform must produce the gEfiSmmSMramMemoryGuid HOB for SmmRelocationLib usage. Cc: Ray Ni <ray.ni@intel.com> Cc: Zeng Star <star.zeng@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com>
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/** @file
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SMM Relocation Lib for each processor.
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This Lib produces the SMM_BASE_HOB in HOB database which tells
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the PiSmmCpuDxeSmm driver (runs at a later phase) about the new
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SMBASE for each processor. PiSmmCpuDxeSmm driver installs the
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SMI handler at the SMM_BASE_HOB.SmBase[Index]+0x8000 for processor
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Index.
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Copyright (c) 2024, 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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#ifndef INTERNAL_SMM_RELOCATION_LIB_H_
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#define INTERNAL_SMM_RELOCATION_LIB_H_
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/CpuExceptionHandlerLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/LocalApicLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/PcdLib.h>
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#include <Library/PeimEntryPoint.h>
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#include <Library/PeiServicesLib.h>
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#include <Library/SmmRelocationLib.h>
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#include <Guid/SmramMemoryReserve.h>
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#include <Guid/SmmBaseHob.h>
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#include <Register/Intel/Cpuid.h>
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#include <Register/Intel/SmramSaveStateMap.h>
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#include <Protocol/MmCpu.h>
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extern IA32_DESCRIPTOR gcSmiInitGdtr;
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extern CONST UINT16 gcSmmInitSize;
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extern CONST UINT8 gcSmmInitTemplate[];
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X86_ASSEMBLY_PATCH_LABEL gPatchSmmCr0;
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X86_ASSEMBLY_PATCH_LABEL gPatchSmmCr3;
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X86_ASSEMBLY_PATCH_LABEL gPatchSmmCr4;
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X86_ASSEMBLY_PATCH_LABEL gPatchSmmInitStack;
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//
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// The size 0x20 must be bigger than
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// the size of template code of SmmInit. Currently,
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// the size of SmmInit requires the 0x16 Bytes buffer
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// at least.
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//
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#define BACK_BUF_SIZE 0x20
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#define CR4_CET_ENABLE BIT23
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//
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// EFER register LMA bit
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//
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#define LMA BIT10
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/**
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This function configures the SmBase on the currently executing CPU.
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@param[in] SmBase The SmBase on the currently executing CPU.
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**/
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VOID
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EFIAPI
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ConfigureSmBase (
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IN UINT64 SmBase
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);
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/**
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Semaphore operation for all processor relocate SMMBase.
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**/
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VOID
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EFIAPI
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SmmRelocationSemaphoreComplete (
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VOID
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);
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/**
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Hook the code executed immediately after an RSM instruction on the currently
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executing CPU. The mode of code executed immediately after RSM must be
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detected, and the appropriate hook must be selected. Always clear the auto
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HALT restart flag if it is set.
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@param[in] CpuIndex The processor index for the currently
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executing CPU.
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@param[in,out] CpuState Pointer to SMRAM Save State Map for the
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currently executing CPU.
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@param[in] NewInstructionPointer32 Instruction pointer to use if resuming to
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32-bit mode from 64-bit SMM.
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@param[in] NewInstructionPointer Instruction pointer to use if resuming to
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same mode as SMM.
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@retval The value of the original instruction pointer before it was hooked.
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**/
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UINT64
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EFIAPI
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HookReturnFromSmm (
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IN UINTN CpuIndex,
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IN OUT SMRAM_SAVE_STATE_MAP *CpuState,
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IN UINT64 NewInstructionPointer32,
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IN UINT64 NewInstructionPointer
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);
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/**
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Hook return address of SMM Save State so that semaphore code
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can be executed immediately after AP exits SMM to indicate to
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the BSP that an AP has exited SMM after SMBASE relocation.
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@param[in] CpuIndex The processor index.
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@param[in] RebasedFlag A pointer to a flag that is set to TRUE
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immediately after AP exits SMM.
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**/
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VOID
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SemaphoreHook (
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IN UINTN CpuIndex,
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IN volatile BOOLEAN *RebasedFlag
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);
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/**
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This function fixes up the address of the global variable or function
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referred in SmmInit assembly files to be the absolute address.
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**/
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VOID
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EFIAPI
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SmmInitFixupAddress (
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);
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#endif
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