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| author | Michael Kinney <michael.d.kinney@intel.com> | 2015-10-19 19:13:13 +0000 |
|---|---|---|
| committer | mdkinney <mdkinney@Edk2> | 2015-10-19 19:13:13 +0000 |
| commit | 7947da3cccb5dfc973fe9ad9d814477ed978aea1 (patch) | |
| tree | de6303c77acb21f5c627b093106d5196a65fad00 /UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c | |
| parent | 529a5a860996b5e83941bab50a7b8604139264a1 (diff) | |
| download | edk2-platforms-7947da3cccb5dfc973fe9ad9d814477ed978aea1.tar.xz | |
UefiCpuPkg: Add PiSmmCpuDxeSmm module IA32 files
Add module that initializes a CPU for the SMM environment and
installs the first level SMI handler. This module along with the
SMM IPL and SMM Core provide the services required for
DXE_SMM_DRIVERS to register hardware and software SMI handlers.
CPU specific features are abstracted through the SmmCpuFeaturesLib
Platform specific features are abstracted through the
SmmCpuPlatformHookLib
Several PCDs are added to enable/disable features and configure
settings for the PiSmmCpuDxeSmm module
[jeff.fan@intel.com: Fix code style issues reported by ECC]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18646 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c new file mode 100644 index 0000000000..02a866b430 --- /dev/null +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Semaphore.c @@ -0,0 +1,48 @@ +/** @file
+Semaphore mechanism to indicate to the BSP that an AP has exited SMM
+after SMBASE relocation.
+
+Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "PiSmmCpuDxeSmm.h"
+
+UINTN mSmmRelocationOriginalAddress;
+volatile BOOLEAN *mRebasedFlag;
+
+/**
+ Hook return address of SMM Save State so that semaphore code
+ can be executed immediately after AP exits SMM to indicate to
+ the BSP that an AP has exited SMM after SMBASE relocation.
+
+ @param[in] CpuIndex The processor index.
+ @param[in] RebasedFlag A pointer to a flag that is set to TRUE
+ immediately after AP exits SMM.
+
+**/
+VOID
+SemaphoreHook (
+ IN UINTN CpuIndex,
+ IN volatile BOOLEAN *RebasedFlag
+ )
+{
+ SMRAM_SAVE_STATE_MAP *CpuState;
+
+ mRebasedFlag = RebasedFlag;
+
+ CpuState = (SMRAM_SAVE_STATE_MAP *)(UINTN)(SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET);
+ mSmmRelocationOriginalAddress = (UINTN)HookReturnFromSmm (
+ CpuIndex,
+ CpuState,
+ (UINT64)(UINTN)&SmmRelocationSemaphoreComplete,
+ (UINT64)(UINTN)&SmmRelocationSemaphoreComplete
+ );
+}
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