+++ /dev/null
-/** @file\r
- SMM Access2 Protocol on SMM Access Protocol Thunk driver.\r
-\r
- Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-\r
-**/\r
-\r
-#include "SmmAccess2OnSmmAccessThunk.h"\r
-\r
-EFI_SMM_ACCESS2_PROTOCOL gSmmAccess2 = {\r
- SmmAccess2Open,\r
- SmmAccess2Close,\r
- SmmAccess2Lock,\r
- SmmAccess2GetCapabilities,\r
- FALSE,\r
- FALSE\r
-};\r
-\r
-EFI_SMM_ACCESS_PROTOCOL *mSmmAccess;\r
-UINTN mSmramRegionNumber;\r
-\r
-/**\r
- Opens the SMRAM area to be accessible by a boot-service driver.\r
-\r
- This function "opens" SMRAM so that it is visible while not inside of SMM. The function should \r
- return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM. The function \r
- should return EFI_DEVICE_ERROR if the SMRAM configuration is locked.\r
-\r
- @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.\r
-\r
- @retval EFI_SUCCESS The operation was successful.\r
- @retval EFI_UNSUPPORTED The system does not support opening and closing of SMRAM.\r
- @retval EFI_DEVICE_ERROR SMRAM cannot be opened, perhaps because it is locked.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmmAccess2Open (\r
- IN EFI_SMM_ACCESS2_PROTOCOL *This\r
- )\r
-{\r
- EFI_STATUS Status;\r
- UINTN DescriptorIndex;\r
-\r
- ///\r
- /// Open all SMRAM regions via SMM Access Protocol\r
- ///\r
-\r
- Status = EFI_SUCCESS;\r
- for (DescriptorIndex = 0; DescriptorIndex < mSmramRegionNumber && !EFI_ERROR (Status); DescriptorIndex++) {\r
- Status = mSmmAccess->Open (mSmmAccess, DescriptorIndex);\r
- }\r
- if (!EFI_ERROR (Status)) {\r
- gSmmAccess2.OpenState = TRUE;\r
- }\r
- return Status;\r
-}\r
-\r
-/**\r
- Inhibits access to the SMRAM.\r
-\r
- This function "closes" SMRAM so that it is not visible while outside of SMM. The function should \r
- return EFI_UNSUPPORTED if the hardware does not support hiding of SMRAM.\r
-\r
- @param [in] This The EFI_SMM_ACCESS2_PROTOCOL instance.\r
-\r
- @retval EFI_SUCCESS The operation was successful.\r
- @retval EFI_UNSUPPORTED The system does not support opening and closing of SMRAM.\r
- @retval EFI_DEVICE_ERROR SMRAM cannot be closed.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmmAccess2Close (\r
- IN EFI_SMM_ACCESS2_PROTOCOL *This\r
- )\r
-{\r
- EFI_STATUS Status;\r
- UINTN DescriptorIndex;\r
-\r
- ///\r
- /// Close all SMRAM regions via SMM Access Protocol\r
- ///\r
-\r
- Status = EFI_SUCCESS;\r
- for (DescriptorIndex = 0; DescriptorIndex < mSmramRegionNumber && !EFI_ERROR (Status); DescriptorIndex++) {\r
- Status = mSmmAccess->Close (mSmmAccess, DescriptorIndex);\r
- }\r
- if (!EFI_ERROR (Status)) {\r
- gSmmAccess2.OpenState = FALSE;\r
- }\r
- return Status;\r
-}\r
-\r
-/**\r
- Inhibits access to the SMRAM.\r
-\r
- This function prohibits access to the SMRAM region. This function is usually implemented such \r
- that it is a write-once operation. \r
-\r
- @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.\r
-\r
- @retval EFI_SUCCESS The device was successfully locked.\r
- @retval EFI_UNSUPPORTED The system does not support locking of SMRAM.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmmAccess2Lock (\r
- IN EFI_SMM_ACCESS2_PROTOCOL *This\r
- )\r
-{\r
- EFI_STATUS Status;\r
- UINTN DescriptorIndex;\r
-\r
- ///\r
- /// Lock all SMRAM regions via SMM Access Protocol\r
- ///\r
-\r
- Status = EFI_SUCCESS;\r
- for (DescriptorIndex = 0; DescriptorIndex < mSmramRegionNumber && !EFI_ERROR (Status); DescriptorIndex++) {\r
- Status = mSmmAccess->Lock (mSmmAccess, DescriptorIndex);\r
- }\r
- if (!EFI_ERROR (Status)) {\r
- gSmmAccess2.LockState = TRUE;\r
- }\r
- return Status;\r
-}\r
-\r
-/**\r
- Queries the memory controller for the possible regions that will support SMRAM.\r
-\r
- @param[in] This The EFI_SMM_ACCESS2_PROTOCOL instance.\r
- @param[in, out] SmramMapSize A pointer to the size, in bytes, of the SmramMemoryMap buffer.\r
- @param[in, out] SmramMap A pointer to the buffer in which firmware places the current memory map.\r
-\r
- @retval EFI_SUCCESS The chipset supported the given resource.\r
- @retval EFI_BUFFER_TOO_SMALL The SmramMap parameter was too small. The current buffer size \r
- needed to hold the memory map is returned in SmramMapSize.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmmAccess2GetCapabilities (\r
- IN CONST EFI_SMM_ACCESS2_PROTOCOL *This,\r
- IN OUT UINTN *SmramMapSize,\r
- IN OUT EFI_SMRAM_DESCRIPTOR *SmramMap\r
- )\r
-{\r
- return mSmmAccess->GetCapabilities (mSmmAccess, SmramMapSize, SmramMap);\r
-}\r
-\r
-/**\r
- Entry Point for SMM Access2 On SMM Access Thunk driver.\r
-\r
- @param[in] ImageHandle Image handle of this driver.\r
- @param[in] SystemTable A Pointer to the EFI System Table.\r
-\r
- @retval EFI_SUCCESS The entry point is executed successfully.\r
- @retval other Some error occurred when executing this entry point.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-SmmAccess2ThunkMain (\r
- IN EFI_HANDLE ImageHandle,\r
- IN EFI_SYSTEM_TABLE *SystemTable\r
- )\r
-{\r
- EFI_STATUS Status;\r
- UINTN SmramMapSize;\r
-\r
- ///\r
- /// Locate SMM Access Protocol\r
- ///\r
- Status = gBS->LocateProtocol (&gEfiSmmAccessProtocolGuid, NULL, (VOID **)&mSmmAccess);\r
- ASSERT_EFI_ERROR (Status);\r
-\r
- ///\r
- /// Calculate number of SMRAM regions\r
- ///\r
- SmramMapSize = 0;\r
- Status = mSmmAccess->GetCapabilities (mSmmAccess, &SmramMapSize, NULL);\r
- ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r
-\r
- mSmramRegionNumber = SmramMapSize/sizeof (EFI_SMRAM_DESCRIPTOR);\r
- ASSERT (mSmramRegionNumber > 0);\r
-\r
- ///\r
- /// Assume all SMRAM regions have consistent OPEN and LOCK states\r
- ///\r
- gSmmAccess2.OpenState = mSmmAccess->OpenState;\r
- gSmmAccess2.LockState = mSmmAccess->LockState;\r
-\r
- ///\r
- /// Publish PI SMM Access2 Protocol\r
- ///\r
- Status = gBS->InstallProtocolInterface (\r
- &ImageHandle,\r
- &gEfiSmmAccess2ProtocolGuid,\r
- EFI_NATIVE_INTERFACE,\r
- &gSmmAccess2\r
- );\r
- return Status;\r
-}\r
-\r
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