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 UINTN mSmmRelocationOriginalAddress; 19 volatile BOOLEAN *mRebasedFlag; 20 21 /** 22 Hook return address of SMM Save State so that semaphore code 23 can be executed immediately after AP exits SMM to indicate to 24 the BSP that an AP has exited SMM after SMBASE relocation. 25 26 @param[in] CpuIndex The processor index. 27 @param[in] RebasedFlag A pointer to a flag that is set to TRUE 28 immediately after AP exits SMM. 29 30 **/ 31 VOID 32 SemaphoreHook ( 33 IN UINTN CpuIndex, 34 IN volatile BOOLEAN *RebasedFlag 35 ) 36 { 37 SMRAM_SAVE_STATE_MAP *CpuState; 38 39 mRebasedFlag = RebasedFlag; 40 41 CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET); 42 mSmmRelocationOriginalAddress = (UINTN)HookReturnFromSmm ( 43 CpuIndex, 44 CpuState, 45 (UINT64)(UINTN)&SmmRelocationSemaphoreComplete, 46 (UINT64)(UINTN)&SmmRelocationSemaphoreComplete 47 ); 48 } 49
