+++ /dev/null
-/** @file\r
-\r
-Copyright (c) 2007 - 2009, 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
-**/\r
-\r
-#include <Uefi.h>\r
-\r
-#include <Library/BaseLib.h>\r
-#include <Library/DebugLib.h>\r
-#include <Library/UefiDriverEntryPoint.h>\r
-#include <Library/UefiBootServicesTableLib.h>\r
-#include <Library/PlatformDriverOverrideLib.h>\r
-#include <Protocol/PlatformDriverOverride.h>\r
-\r
-LIST_ENTRY mMappingDataBase = INITIALIZE_LIST_HEAD_VARIABLE (mMappingDataBase);\r
-BOOLEAN mEnvironmentVariableRead = FALSE;\r
-EFI_HANDLE mCallerImageHandle = NULL;\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
-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
- //\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 (EFI_ERROR (Status)){\r
- DEBUG ((DEBUG_ERROR, "The status to Get Platform Driver Override Variable is %r\n", Status));\r
- InitializeListHead (&mMappingDataBase);\r
- return EFI_NOT_FOUND;\r
- }\r
- }\r
-\r
- //\r
- // if the environment variable does not exist, just return not found\r
- //\r
- if (IsListEmpty (&mMappingDataBase)) {\r
- return EFI_NOT_FOUND;\r
- }\r
-\r
- return GetDriverFromMapping (\r
- ControllerHandle,\r
- DriverImageHandle,\r
- &mMappingDataBase,\r
- mCallerImageHandle\r
- );\r
-}\r
-\r
-/**\r
- Retrieves the device path of the platform override driver for a controller in the system.\r
- This driver doesn't support this API.\r
-\r
- @param This A pointer to the EFI_PLATFORM_DRIVER_OVERRIDE_\r
- PROTOCOL instance. \r
- @param ControllerHandle The device handle of the controller to check if a driver override\r
- exists. \r
- @param DriverImagePath On input, a pointer to the previous driver device path returned by\r
- GetDriverPath(). On output, a pointer to the next driver\r
- device path. Passing in a pointer to NULL, will return the first\r
- driver device path for ControllerHandle.\r
- \r
- @retval EFI_UNSUPPORTED\r
-**/\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
- Used to associate a driver image handle with a device path that was returned on a prior call to the\r
- GetDriverPath() service. This driver image handle will then be available through the \r
- GetDriver() service. This driver doesn't support this API.\r
-\r
- @param This A pointer to the EFI_PLATFORM_DRIVER_OVERRIDE_\r
- PROTOCOL instance. \r
- @param ControllerHandle The device handle of the controller. \r
- @param DriverImagePath A pointer to the driver device path that was returned in a prior\r
- call to GetDriverPath(). \r
- @param DriverImageHandle The driver image handle that was returned by LoadImage()\r
- when the driver specified by DriverImagePath was loaded \r
- into memory. \r
- \r
- @retval EFI_UNSUPPORTED\r
-**/\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
-\r
-EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL mPlatformDriverOverride = {\r
- GetDriver,\r
- GetDriverPath,\r
- DriverLoaded\r
-};\r
-\r
-/**\r
- Platform Driver Override driver entry point, install the Platform Driver Override Protocol\r
-\r
- @param ImageHandle ImageHandle of the loaded driver.\r
- @param SystemTable Pointer to the EFI System Table.\r
-\r
- @retval EFI_SUCCESS The DXE Driver, DXE Runtime Driver, DXE SMM Driver,\r
- or UEFI Driver exited normally.\r
- @retval EFI_ALREADY_STARTED A protocol instance has been installed. Not need install again.\r
-**/\r
-EFI_STATUS\r
-EFIAPI\r
-PlatformDriverOverrideEntry (\r
- IN EFI_HANDLE ImageHandle,\r
- IN EFI_SYSTEM_TABLE *SystemTable\r
- )\r
-{\r
- EFI_HANDLE Handle;\r
- EFI_STATUS Status;\r
- VOID *Instance;\r
-\r
- mCallerImageHandle = ImageHandle;\r
-\r
- //\r
- // According to UEFI spec, there can be at most a single instance\r
- // in the system of the EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL.\r
- // So here we check the existence.\r
- //\r
- Status = gBS->LocateProtocol (\r
- &gEfiPlatformDriverOverrideProtocolGuid,\r
- NULL,\r
- &Instance\r
- );\r
- //\r
- // If there was no error, assume there is an installation and return error\r
- //\r
- if (!EFI_ERROR (Status)) {\r
- return EFI_ALREADY_STARTED;\r
- }\r
-\r
- //\r
- // Install platform driver override protocol\r
- //\r
- Handle = NULL;\r
- Status = gBS->InstallProtocolInterface (\r
- &Handle,\r
- &gEfiPlatformDriverOverrideProtocolGuid,\r
- EFI_NATIVE_INTERFACE,\r
- &mPlatformDriverOverride\r
- );\r
- ASSERT_EFI_ERROR (Status);\r
- return EFI_SUCCESS;\r
-}\r
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