+++ /dev/null
-/** @file\r
-\r
-Copyright (c) 2007, Intel Corporation\r
-All rights reserved. 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
-Module Name:\r
-\r
- PlatformDriOverride.c\r
-\r
-Abstract:\r
-\r
-\r
-**/\r
-\r
-\r
-#include "PlatformDriOverride.h"\r
-\r
-EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL gPlatformDriverOverride = {\r
- GetDriver,\r
- GetDriverPath,\r
- DriverLoaded\r
-};\r
-\r
-STATIC LIST_ENTRY mMappingDataBase = INITIALIZE_LIST_HEAD_VARIABLE (mMappingDataBase);\r
-STATIC BOOLEAN mEnvironmentVariableRead = FALSE;\r
-STATIC EFI_HANDLE mCallerImageHandle;\r
-\r
-\r
-EFI_STATUS\r
-EFIAPI\r
-PlatformDriverOverrideEntry (\r
- IN EFI_HANDLE ImageHandle,\r
- IN EFI_SYSTEM_TABLE *SystemTable\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Platform Driver Override driver entry point, install the Platform Driver Override Protocol\r
-\r
-Arguments:\r
- (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)\r
-\r
-Returns:\r
- EFI_STATUS\r
-\r
---*/\r
-{\r
- mEnvironmentVariableRead = FALSE;\r
- mCallerImageHandle = ImageHandle;\r
- InitializeListHead (&mMappingDataBase);\r
- return InstallPlatformDriverOverrideProtocol (&gPlatformDriverOverride);\r
-}\r
-\r
-\r
-/**\r
- Retrieves the image handle of the platform override driver for a controller in the system.\r
-\r
- @param This A pointer to the\r
- EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL instance.\r
- @param ControllerHandle The device handle of the controller to check if a\r
- driver override exists.\r
- @param DriverImageHandle On input, a pointer to the previous driver image\r
- handle returned by GetDriver(). On output, a\r
- pointer to the next driver image handle. Passing\r
- in a NULL, will return the first driver image\r
- handle for ControllerHandle.\r
-\r
- @retval EFI_SUCCESS The driver override for ControllerHandle was\r
- returned in DriverImageHandle.\r
- @retval EFI_NOT_FOUND A driver override for ControllerHandle was not\r
- found.\r
- @retval EFI_INVALID_PARAMETER The handle specified by ControllerHandle is not a\r
- valid handle. DriverImageHandle is not a handle\r
- that was returned on a previous call to\r
- GetDriver().\r
-\r
-**/\r
-STATIC\r
-EFI_STATUS\r
-EFIAPI\r
-GetDriver (\r
- IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,\r
- IN EFI_HANDLE ControllerHandle,\r
- IN OUT EFI_HANDLE * DriverImageHandle\r
- )\r
-{\r
- EFI_STATUS Status;\r
- //\r
- // Check that ControllerHandle is a valid handle\r
- //\r
- if (ControllerHandle == NULL) {\r
- return EFI_INVALID_PARAMETER;\r
- }\r
-\r
- //\r
- // Read the environment variable(s) that contain the override mappings from Controller Device Path to\r
- // a set of Driver Device Paths, and initialize in memory database of the overrides that map Controller\r
- // Device Paths to an ordered set of Driver Device Paths and Driver Handles. This action is only performed\r
- // once and finished in first call.\r
- //\r
- if (!mEnvironmentVariableRead) {\r
- mEnvironmentVariableRead = TRUE;\r
-\r
- Status = InitOverridesMapping (&mMappingDataBase);\r
- if (Status == EFI_NOT_FOUND) {\r
- InitializeListHead (&mMappingDataBase);\r
- return EFI_NOT_FOUND;\r
- } else if (Status == EFI_VOLUME_CORRUPTED){\r
- DEBUG ((DEBUG_ERROR, "Platform Driver Override Variable is corrupt\n"));\r
- //\r
- // The environment variable(s) that contain the override mappings from Controller Device Path to\r
- // a set of Driver Device Paths is corrupted, platform code can use LibDeleteOverridesVariables to\r
- // delete all orverride variables as a policy. Here can be IBV/OEM customized.\r
- //\r
-\r
- //LibDeleteOverridesVariables();\r
- InitializeListHead (&mMappingDataBase);\r
- return EFI_NOT_FOUND;\r
- } else if (EFI_ERROR (Status)){\r
- InitializeListHead (&mMappingDataBase);\r
- return EFI_NOT_FOUND;\r
- }\r
- }\r
- //\r
- // if the environment variable does not exist or the variable appears to be corrupt, just return not found\r
- //\r
- if (IsListEmpty (&mMappingDataBase)) {\r
- return EFI_NOT_FOUND;\r
- }\r
-\r
- return GetDriverFromMapping (\r
- This,\r
- ControllerHandle,\r
- DriverImageHandle,\r
- &mMappingDataBase,\r
- mCallerImageHandle\r
- );\r
-\r
-}\r
-\r
-\r
-/**\r
- For the use of the ControllerHandle parameter in the GetDriverPath() and DriverLoaded() APIs\r
- makes those APIs very difficult to use, so not support.\r
-\r
-\r
-\r
-**/\r
-STATIC\r
-EFI_STATUS\r
-EFIAPI\r
-GetDriverPath (\r
- IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,\r
- IN EFI_HANDLE ControllerHandle,\r
- IN OUT EFI_DEVICE_PATH_PROTOCOL **DriverImagePath\r
- )\r
-{\r
- return EFI_UNSUPPORTED;\r
-}\r
-\r
-\r
-/**\r
- For the use of the ControllerHandle parameter in the GetDriverPath() and DriverLoaded() APIs\r
- makes those APIs very difficult to use, so not support.\r
-\r
-\r
-\r
-**/\r
-STATIC\r
-EFI_STATUS\r
-EFIAPI\r
-DriverLoaded (\r
- IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,\r
- IN EFI_HANDLE ControllerHandle,\r
- IN EFI_DEVICE_PATH_PROTOCOL * DriverImagePath,\r
- IN EFI_HANDLE DriverImageHandle\r
- )\r
-{\r
- return EFI_UNSUPPORTED;\r
-}\r
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