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https://github.com/CloverHackyColor/CloverBootloader.git
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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/** @file
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Semaphore mechanism to indicate to the BSP that an AP has exited SMM
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after SMBASE relocation.
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Copyright (c) 2009 - 2015, 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 "PiSmmCpuDxeSmm.h"
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X86_ASSEMBLY_PATCH_LABEL gPatchSmmRelocationOriginalAddressPtr32;
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X86_ASSEMBLY_PATCH_LABEL gPatchRebasedFlagAddr32;
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UINTN mSmmRelocationOriginalAddress;
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volatile BOOLEAN *mRebasedFlag;
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/**
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AP Semaphore operation in 32-bit mode while BSP runs in 64-bit mode.
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**/
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VOID
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SmmRelocationSemaphoreComplete32 (
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VOID
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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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SMRAM_SAVE_STATE_MAP *CpuState;
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UINTN TempValue;
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mRebasedFlag = RebasedFlag;
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PatchInstructionX86 (
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gPatchRebasedFlagAddr32,
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(UINT32)(UINTN)mRebasedFlag,
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4
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);
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CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET);
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mSmmRelocationOriginalAddress = HookReturnFromSmm (
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CpuIndex,
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CpuState,
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(UINT64)(UINTN)&SmmRelocationSemaphoreComplete32,
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(UINT64)(UINTN)&SmmRelocationSemaphoreComplete
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);
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//
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// Use temp value to fix ICC compiler warning
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//
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TempValue = (UINTN)&mSmmRelocationOriginalAddress;
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PatchInstructionX86 (
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gPatchSmmRelocationOriginalAddressPtr32,
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(UINT32)TempValue,
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4
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);
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}
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