projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 427e3573 MK |
1 | /** @file\r |
| 2 | Semaphore mechanism to indicate to the BSP that an AP has exited SMM\r | |
| 3 | after SMBASE relocation.\r | |
| 4 | \r | |
| 5 | Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
| 0acd8697 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 427e3573 MK |
7 | \r |
| 8 | **/\r | |
| 9 | \r | |
| 10 | #include "PiSmmCpuDxeSmm.h"\r | |
| 11 | \r | |
| 053e878b MK |
12 | X86_ASSEMBLY_PATCH_LABEL gPatchSmmRelocationOriginalAddressPtr32;\r |
| 13 | X86_ASSEMBLY_PATCH_LABEL gPatchRebasedFlagAddr32;\r | |
| 427e3573 MK |
14 | \r |
| 15 | UINTN mSmmRelocationOriginalAddress;\r | |
| 16 | volatile BOOLEAN *mRebasedFlag;\r | |
| 17 | \r | |
| 18 | /**\r | |
| 19 | AP Semaphore operation in 32-bit mode while BSP runs in 64-bit mode.\r | |
| 20 | **/\r | |
| 21 | VOID\r | |
| 22 | SmmRelocationSemaphoreComplete32 (\r | |
| 23 | VOID\r | |
| 24 | );\r | |
| 25 | \r | |
| 26 | /**\r | |
| 27 | Hook return address of SMM Save State so that semaphore code\r | |
| 28 | can be executed immediately after AP exits SMM to indicate to\r | |
| 29 | the BSP that an AP has exited SMM after SMBASE relocation.\r | |
| 30 | \r | |
| 31 | @param[in] CpuIndex The processor index.\r | |
| 32 | @param[in] RebasedFlag A pointer to a flag that is set to TRUE\r | |
| 33 | immediately after AP exits SMM.\r | |
| 34 | \r | |
| 35 | **/\r | |
| 36 | VOID\r | |
| 37 | SemaphoreHook (\r | |
| 38 | IN UINTN CpuIndex,\r | |
| 39 | IN volatile BOOLEAN *RebasedFlag\r | |
| 40 | )\r | |
| 41 | {\r | |
| 42 | SMRAM_SAVE_STATE_MAP *CpuState;\r | |
| 43 | UINTN TempValue;\r | |
| 44 | \r | |
| 053e878b | 45 | mRebasedFlag = RebasedFlag;\r |
| 9686a467 LE |
46 | PatchInstructionX86 (\r |
| 47 | gPatchRebasedFlagAddr32,\r | |
| 48 | (UINT32)(UINTN)mRebasedFlag,\r | |
| 49 | 4\r | |
| 50 | );\r | |
| 427e3573 | 51 | \r |
| 053e878b | 52 | CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET);\r |
| 427e3573 MK |
53 | mSmmRelocationOriginalAddress = HookReturnFromSmm (\r |
| 54 | CpuIndex,\r | |
| 55 | CpuState,\r | |
| 56 | (UINT64)(UINTN)&SmmRelocationSemaphoreComplete32,\r | |
| 57 | (UINT64)(UINTN)&SmmRelocationSemaphoreComplete\r | |
| 58 | );\r | |
| 59 | \r | |
| 60 | //\r | |
| ef62da4f | 61 | // Use temp value to fix ICC compiler warning\r |
| 427e3573 MK |
62 | //\r |
| 63 | TempValue = (UINTN)&mSmmRelocationOriginalAddress;\r | |
| 9686a467 LE |
64 | PatchInstructionX86 (\r |
| 65 | gPatchSmmRelocationOriginalAddressPtr32,\r | |
| 66 | (UINT32)TempValue,\r | |
| 67 | 4\r | |
| 68 | );\r | |
| 427e3573 | 69 | }\r |