diff options
Diffstat (limited to 'Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm')
| -rw-r--r-- | Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.c | 182 | ||||
| -rw-r--r-- | Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.inf | 59 |
2 files changed, 241 insertions, 0 deletions
diff --git a/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.c b/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.c new file mode 100644 index 0000000000..a48de262db --- /dev/null +++ b/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.c @@ -0,0 +1,182 @@ +/** @file
+ A helper driver to save information to SMRAM after SMRR is enabled.
+
+ This driver is for ECP platforms.
+
+ Copyright (c) 2010 - 2014, 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 that 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 <PiSmm.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/SmmServicesTableLib.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/IoLib.h>
+#include <Protocol/SmmSwDispatch.h>
+#include <Protocol/SmmReadyToLock.h>
+#include <Protocol/SmmControl.h>
+
+#define SMM_FROM_SMBASE_DRIVER 0x55
+#define SMM_FROM_CPU_DRIVER_SAVE_INFO 0x81
+
+#define EFI_SMRAM_CPU_NVS_HEADER_GUID \
+ { \
+ 0x429501d9, 0xe447, 0x40f4, 0x86, 0x7b, 0x75, 0xc9, 0x3a, 0x1d, 0xb5, 0x4e \
+ }
+
+UINT8 mSmiDataRegister;
+BOOLEAN mLocked = FALSE;
+EFI_GUID mSmramCpuNvsHeaderGuid = EFI_SMRAM_CPU_NVS_HEADER_GUID;
+
+/**
+ Dispatch function for a Software SMI handler.
+
+ @param DispatchHandle The handle of this dispatch function.
+ @param DispatchContext The pointer to the dispatch function's context.
+ The SwSmiInputValue field is filled in
+ by the software dispatch driver prior to
+ invoking this dispatch function.
+ The dispatch function will only be called
+ for input values for which it is registered.
+
+ @return None
+
+**/
+VOID
+EFIAPI
+SmramSaveInfoHandler (
+ IN EFI_HANDLE DispatchHandle,
+ IN EFI_SMM_SW_DISPATCH_CONTEXT *DispatchContext
+ )
+{
+ EFI_STATUS Status;
+ UINT64 VarData[3];
+ UINTN VarSize;
+
+ ASSERT (DispatchContext != NULL);
+ ASSERT (DispatchContext->SwSmiInputValue == SMM_FROM_SMBASE_DRIVER);
+
+ if (!mLocked && IoRead8 (mSmiDataRegister) == SMM_FROM_CPU_DRIVER_SAVE_INFO) {
+ VarSize = sizeof (VarData);
+ Status = gRT->GetVariable (
+ L"SmramCpuNvs",
+ &mSmramCpuNvsHeaderGuid,
+ NULL,
+ &VarSize,
+ VarData
+ );
+ if (!EFI_ERROR (Status) && VarSize == sizeof (VarData)) {
+ CopyMem (
+ (VOID *)(UINTN)(VarData[0]),
+ (VOID *)(UINTN)(VarData[1]),
+ (UINTN)(VarData[2])
+ );
+ }
+ }
+}
+
+/**
+ Smm Ready To Lock event notification handler.
+
+ It sets a flag indicating that SMRAM has been locked.
+
+ @param[in] Protocol Points to the protocol's unique identifier.
+ @param[in] Interface Points to the interface instance.
+ @param[in] Handle The handle on which the interface was installed.
+
+ @retval EFI_SUCCESS Notification handler runs successfully.
+ **/
+EFI_STATUS
+EFIAPI
+SmmReadyToLockEventNotify (
+ IN CONST EFI_GUID *Protocol,
+ IN VOID *Interface,
+ IN EFI_HANDLE Handle
+ )
+{
+ mLocked = TRUE;
+ return EFI_SUCCESS;
+}
+
+/**
+ Entry point function of this driver.
+
+ @param[in] ImageHandle The firmware allocated handle for the EFI image.
+ @param[in] SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The entry point is executed successfully.
+ @retval other Some error occurs when executing this entry point.
+**/
+EFI_STATUS
+EFIAPI
+SmramSaveInfoHandlerSmmMain (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ EFI_SMM_SW_DISPATCH_PROTOCOL *SmmSwDispatch;
+ EFI_SMM_SW_DISPATCH_CONTEXT SmmSwDispatchContext;
+ EFI_HANDLE DispatchHandle;
+ EFI_SMM_CONTROL_PROTOCOL *SmmControl;
+ EFI_SMM_CONTROL_REGISTER SmmControlRegister;
+ VOID *Registration;
+
+ //
+ // Get SMI data register
+ //
+ Status = SystemTable->BootServices->LocateProtocol (
+ &gEfiSmmControlProtocolGuid,
+ NULL,
+ (VOID **)&SmmControl
+ );
+ ASSERT_EFI_ERROR (Status);
+ Status = SmmControl->GetRegisterInfo (SmmControl, &SmmControlRegister);
+ ASSERT_EFI_ERROR (Status);
+ mSmiDataRegister = SmmControlRegister.SmiDataRegister;
+
+ //
+ // Register software SMI handler
+ //
+
+ Status = SystemTable->BootServices->LocateProtocol (
+ &gEfiSmmSwDispatchProtocolGuid,
+ NULL,
+ (VOID **)&SmmSwDispatch
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ SmmSwDispatchContext.SwSmiInputValue = SMM_FROM_SMBASE_DRIVER;
+ Status = SmmSwDispatch->Register (
+ SmmSwDispatch,
+ &SmramSaveInfoHandler,
+ &SmmSwDispatchContext,
+ &DispatchHandle
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Register SMM Ready To Lock Protocol notification
+ //
+ Status = gSmst->SmmRegisterProtocolNotify (
+ &gEfiSmmReadyToLockProtocolGuid,
+ SmmReadyToLockEventNotify,
+ &Registration
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ return Status;
+}
+
diff --git a/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.inf b/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.inf new file mode 100644 index 0000000000..82eec0152b --- /dev/null +++ b/Vlv2TbltDevicePkg/SmramSaveInfoHandlerSmm/SmramSaveInfoHandlerSmm.inf @@ -0,0 +1,59 @@ +## @file
+#
+# A helper driver to save information to SMRAM after SMRR is enabled.
+#
+# Copyright (c) 2010 - 2014, 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 that 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.
+#
+#
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = SmramSaveInfoHandlerSmm
+ FILE_GUID = 63296C52-01CF-4eea-A47C-782A14DA6894
+ MODULE_TYPE = DXE_SMM_DRIVER
+ VERSION_STRING = 1.0
+ PI_SPECIFICATION_VERSION = 0x0001000A
+
+ ENTRY_POINT = SmramSaveInfoHandlerSmmMain
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64
+#
+
+[Sources.common]
+ SmramSaveInfoHandlerSmm.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ IntelFrameworkPkg/IntelFrameworkPkg.dec
+
+[LibraryClasses]
+ UefiDriverEntryPoint
+ UefiRuntimeServicesTableLib
+ SmmServicesTableLib
+ BaseLib
+ BaseMemoryLib
+ IoLib
+
+[Protocols]
+ gEfiSmmSwDispatchProtocolGuid ## CONSUMED
+ gEfiSmmControlProtocolGuid ## CONSUMED
+ gEfiSmmReadyToLockProtocolGuid ## CONSUMED
+
+[Depex]
+ gEfiSmmSwDispatchProtocolGuid AND
+ gEfiSmmControlProtocolGuid
+
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