diff options
Diffstat (limited to 'MdeModulePkg/Universal/PlatformDriverOverride/PlatformDriOverrideDxe/PlatformDriOverride.c')
| -rw-r--r-- | MdeModulePkg/Universal/PlatformDriverOverride/PlatformDriOverrideDxe/PlatformDriOverride.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/PlatformDriverOverride/PlatformDriOverrideDxe/PlatformDriOverride.c b/MdeModulePkg/Universal/PlatformDriverOverride/PlatformDriOverrideDxe/PlatformDriOverride.c new file mode 100644 index 0000000..2a18913 --- /dev/null +++ b/MdeModulePkg/Universal/PlatformDriverOverride/PlatformDriOverrideDxe/PlatformDriOverride.c @@ -0,0 +1,186 @@ +/** @file
+
+Copyright (c) 2007, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+
+ PlatformDriOverride.c
+
+Abstract:
+
+
+**/
+
+
+#include "PlatformDriOverride.h"
+
+EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL gPlatformDriverOverride = {
+ GetDriver,
+ GetDriverPath,
+ DriverLoaded
+};
+
+STATIC LIST_ENTRY mMappingDataBase = INITIALIZE_LIST_HEAD_VARIABLE (mMappingDataBase);
+STATIC BOOLEAN mEnvironmentVariableRead = FALSE;
+STATIC EFI_HANDLE mCallerImageHandle;
+
+
+EFI_STATUS
+EFIAPI
+PlatformDriverOverrideEntry (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+/*++
+
+Routine Description:
+ Platform Driver Override driver entry point, install the Platform Driver Override Protocol
+
+Arguments:
+ (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)
+
+Returns:
+ EFI_STATUS
+
+--*/
+{
+ mEnvironmentVariableRead = FALSE;
+ mCallerImageHandle = ImageHandle;
+ InitializeListHead (&mMappingDataBase);
+ return InstallPlatformDriverOverrideProtocol (&gPlatformDriverOverride);
+}
+
+
+/**
+ Retrieves the image handle of the platform override driver for a controller in the system.
+
+ @param This A pointer to the
+ EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL instance.
+ @param ControllerHandle The device handle of the controller to check if a
+ driver override exists.
+ @param DriverImageHandle On input, a pointer to the previous driver image
+ handle returned by GetDriver(). On output, a
+ pointer to the next driver image handle. Passing
+ in a NULL, will return the first driver image
+ handle for ControllerHandle.
+
+ @retval EFI_SUCCESS The driver override for ControllerHandle was
+ returned in DriverImageHandle.
+ @retval EFI_NOT_FOUND A driver override for ControllerHandle was not
+ found.
+ @retval EFI_INVALID_PARAMETER The handle specified by ControllerHandle is not a
+ valid handle. DriverImageHandle is not a handle
+ that was returned on a previous call to
+ GetDriver().
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+GetDriver (
+ IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,
+ IN EFI_HANDLE ControllerHandle,
+ IN OUT EFI_HANDLE * DriverImageHandle
+ )
+{
+ EFI_STATUS Status;
+ //
+ // Check that ControllerHandle is a valid handle
+ //
+ if (ControllerHandle == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Read the environment variable(s) that contain the override mappings from Controller Device Path to
+ // a set of Driver Device Paths, and initialize in memory database of the overrides that map Controller
+ // Device Paths to an ordered set of Driver Device Paths and Driver Handles. This action is only performed
+ // once and finished in first call.
+ //
+ if (!mEnvironmentVariableRead) {
+ mEnvironmentVariableRead = TRUE;
+
+ Status = InitOverridesMapping (&mMappingDataBase);
+ if (Status == EFI_NOT_FOUND) {
+ InitializeListHead (&mMappingDataBase);
+ return EFI_NOT_FOUND;
+ } else if (Status == EFI_VOLUME_CORRUPTED){
+ DEBUG ((DEBUG_ERROR, "Platform Driver Override Variable is corrupt\n"));
+ //
+ // The environment variable(s) that contain the override mappings from Controller Device Path to
+ // a set of Driver Device Paths is corrupted, platform code can use LibDeleteOverridesVariables to
+ // delete all orverride variables as a policy. Here can be IBV/OEM customized.
+ //
+
+ //LibDeleteOverridesVariables();
+ InitializeListHead (&mMappingDataBase);
+ return EFI_NOT_FOUND;
+ } else if (EFI_ERROR (Status)){
+ InitializeListHead (&mMappingDataBase);
+ return EFI_NOT_FOUND;
+ }
+ }
+ //
+ // if the environment variable does not exist or the variable appears to be corrupt, just return not found
+ //
+ if (IsListEmpty (&mMappingDataBase)) {
+ return EFI_NOT_FOUND;
+ }
+
+ return GetDriverFromMapping (
+ This,
+ ControllerHandle,
+ DriverImageHandle,
+ &mMappingDataBase,
+ mCallerImageHandle
+ );
+
+}
+
+
+/**
+ For the use of the ControllerHandle parameter in the GetDriverPath() and DriverLoaded() APIs
+ makes those APIs very difficult to use, so not support.
+
+
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+GetDriverPath (
+ IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,
+ IN EFI_HANDLE ControllerHandle,
+ IN OUT EFI_DEVICE_PATH_PROTOCOL **DriverImagePath
+ )
+{
+ return EFI_UNSUPPORTED;
+}
+
+
+/**
+ For the use of the ControllerHandle parameter in the GetDriverPath() and DriverLoaded() APIs
+ makes those APIs very difficult to use, so not support.
+
+
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+DriverLoaded (
+ IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL * This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL * DriverImagePath,
+ IN EFI_HANDLE DriverImageHandle
+ )
+{
+ return EFI_UNSUPPORTED;
+}
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