1 /** @file 2 Semaphore mechanism to indicate to the BSP that an AP has exited SMM 3 after SMBASE relocation. 4 5 Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR> 6 This program and the accompanying materials 7 are licensed and made available under the terms and conditions of the BSD License 8 which accompanies this distribution. The full text of the license may be found at 9 http://opensource.org/licenses/bsd-license.php 10 11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 13 14 **/ 15 16 #include "PiSmmCpuDxeSmm.h" 17 18 extern UINT32 mSmmRelocationOriginalAddressPtr32; 19 extern UINT32 mRebasedFlagAddr32; 20 21 UINTN mSmmRelocationOriginalAddress; 22 volatile BOOLEAN *mRebasedFlag; 23 24 /** 25 AP Semaphore operation in 32-bit mode while BSP runs in 64-bit mode. 26 **/ 27 VOID 28 SmmRelocationSemaphoreComplete32 ( 29 VOID 30 ); 31 32 /** 33 Hook return address of SMM Save State so that semaphore code 34 can be executed immediately after AP exits SMM to indicate to 35 the BSP that an AP has exited SMM after SMBASE relocation. 36 37 @param[in] CpuIndex The processor index. 38 @param[in] RebasedFlag A pointer to a flag that is set to TRUE 39 immediately after AP exits SMM. 40 41 **/ 42 VOID 43 SemaphoreHook ( 44 IN UINTN CpuIndex, 45 IN volatile BOOLEAN *RebasedFlag 46 ) 47 { 48 SMRAM_SAVE_STATE_MAP *CpuState; 49 UINTN TempValue; 50 51 mRebasedFlag = RebasedFlag; 52 mRebasedFlagAddr32 = (UINT32)(UINTN)mRebasedFlag; 53 54 CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET); 55 mSmmRelocationOriginalAddress = HookReturnFromSmm ( 56 CpuIndex, 57 CpuState, 58 (UINT64)(UINTN)&SmmRelocationSemaphoreComplete32, 59 (UINT64)(UINTN)&SmmRelocationSemaphoreComplete 60 ); 61 62 // 63 // Use temp value to fix ICC complier warning 64 // 65 TempValue = (UINTN)&mSmmRelocationOriginalAddress; 66 mSmmRelocationOriginalAddressPtr32 = (UINT32)TempValue; 67 } 68
