--- /dev/null
+/*++\r
+\r
+Copyright (c) 2006, 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
+ ConPlatform.c\r
+ \r
+Abstract:\r
+\r
+--*/\r
+\r
+#include "ConPlatform.h"\r
+\r
+EFI_DRIVER_BINDING_PROTOCOL gConPlatformTextInDriverBinding = {\r
+ ConPlatformTextInDriverBindingSupported,\r
+ ConPlatformTextInDriverBindingStart,\r
+ ConPlatformDriverBindingStop,\r
+ 0x10,\r
+ NULL,\r
+ NULL\r
+};\r
+\r
+EFI_DRIVER_BINDING_PROTOCOL gConPlatformTextOutDriverBinding = {\r
+ ConPlatformTextOutDriverBindingSupported,\r
+ ConPlatformTextOutDriverBindingStart,\r
+ ConPlatformDriverBindingStop,\r
+ 0x10,\r
+ NULL,\r
+ NULL\r
+};\r
+\r
+STATIC\r
+EFI_STATUS\r
+EFIAPI\r
+ConPlatformTextInDriverBindingSupported (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ Supported \r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Supported() function)\r
+\r
+Returns:\r
+\r
+ None\r
+\r
+--*/\r
+{\r
+ return ConPlatformDriverBindingSupported (\r
+ This,\r
+ ControllerHandle,\r
+ RemainingDevicePath,\r
+ &gEfiSimpleTextInProtocolGuid\r
+ );\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+EFIAPI\r
+ConPlatformTextOutDriverBindingSupported (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ Supported \r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Supported() function)\r
+\r
+Returns:\r
+\r
+ None\r
+\r
+--*/\r
+{\r
+ return ConPlatformDriverBindingSupported (\r
+ This,\r
+ ControllerHandle,\r
+ RemainingDevicePath,\r
+ &gEfiSimpleTextOutProtocolGuid\r
+ );\r
+}\r
+\r
+EFI_STATUS\r
+ConPlatformDriverBindingSupported (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath,\r
+ IN EFI_GUID *ProtocolGuid\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ Supported \r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Supported() function)\r
+\r
+Returns:\r
+\r
+ None\r
+\r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ VOID *Interface;\r
+\r
+ //\r
+ // Test to see if this is a physical device by checking to see if\r
+ // it has a Device Path Protocol\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDevicePathProtocolGuid,\r
+ NULL,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ //\r
+ // Test to see if this device supports the Simple Text Output Protocol\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ ProtocolGuid,\r
+ (VOID **) &Interface,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ ProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+EFIAPI\r
+ConPlatformTextInDriverBindingStart (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+\r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Start() function)\r
+\r
+Returns:\r
+\r
+\r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+ EFI_SIMPLE_TEXT_IN_PROTOCOL *TextIn;\r
+\r
+ //\r
+ // Get the Device Path Protocol so the environment variables can be updated\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDevicePathProtocolGuid,\r
+ (VOID **) &DevicePath,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ //\r
+ // Open the Simple Input Protocol BY_DRIVER\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextInProtocolGuid,\r
+ (VOID **) &TextIn,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ //\r
+ // Check the device handle, if it is a hot plug device,\r
+ // do not put the device path into ConInDev, and install\r
+ // gEfiConsoleInDeviceGuid to the device handle directly.\r
+ // The policy is, make hot plug device plug in and play immediately.\r
+ //\r
+ if (IsHotPlugDevice (This->DriverBindingHandle, ControllerHandle)) {\r
+ gBS->InstallMultipleProtocolInterfaces (\r
+ &ControllerHandle,\r
+ &gEfiConsoleInDeviceGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ } else {\r
+ //\r
+ // Append the device path to the ConInDev environment variable\r
+ //\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarConsoleInpDev,\r
+ DevicePath,\r
+ APPEND\r
+ );\r
+\r
+ //\r
+ // If the device path is an instance in the ConIn environment variable,\r
+ // then install EfiConsoleInDeviceGuid onto ControllerHandle\r
+ //\r
+ Status = ConPlatformUpdateDeviceVariable (\r
+ VarConsoleInp,\r
+ DevicePath,\r
+ CHECK\r
+ );\r
+\r
+ if (!EFI_ERROR (Status)) {\r
+ gBS->InstallMultipleProtocolInterfaces (\r
+ &ControllerHandle,\r
+ &gEfiConsoleInDeviceGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ } else {\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextInProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+ }\r
+ }\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+EFIAPI\r
+ConPlatformTextOutDriverBindingStart (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+\r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Start() function)\r
+\r
+Returns:\r
+\r
+\r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+ EFI_SIMPLE_TEXT_OUT_PROTOCOL *TextOut;\r
+\r
+ BOOLEAN NeedClose;\r
+\r
+ NeedClose = TRUE;\r
+\r
+ //\r
+ // Get the Device Path Protocol so the environment variables can be updated\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDevicePathProtocolGuid,\r
+ (VOID **) &DevicePath,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ //\r
+ // Open the Simple Text Output Protocol BY_DRIVER\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextOutProtocolGuid,\r
+ (VOID **) &TextOut,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ //\r
+ // Check the device handle, if it is a hot plug device,\r
+ // do not put the device path into ConOutDev and StdErrDev,\r
+ // and install gEfiConsoleOutDeviceGuid to the device handle directly.\r
+ // The policy is, make hot plug device plug in and play immediately.\r
+ //\r
+ if (IsHotPlugDevice (This->DriverBindingHandle, ControllerHandle)) {\r
+ gBS->InstallMultipleProtocolInterfaces (\r
+ &ControllerHandle,\r
+ &gEfiConsoleOutDeviceGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ } else {\r
+ //\r
+ // Append the device path to the ConOutDev environment variable\r
+ //\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarConsoleOutDev,\r
+ DevicePath,\r
+ APPEND\r
+ );\r
+ //\r
+ // Append the device path to the StdErrDev environment variable\r
+ //\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarErrorOutDev,\r
+ DevicePath,\r
+ APPEND\r
+ );\r
+\r
+ //\r
+ // If the device path is an instance in the ConOut environment variable,\r
+ // then install EfiConsoleOutDeviceGuid onto ControllerHandle\r
+ //\r
+ Status = ConPlatformUpdateDeviceVariable (\r
+ VarConsoleOut,\r
+ DevicePath,\r
+ CHECK\r
+ );\r
+ if (!EFI_ERROR (Status)) {\r
+ NeedClose = FALSE;\r
+ Status = gBS->InstallMultipleProtocolInterfaces (\r
+ &ControllerHandle,\r
+ &gEfiConsoleOutDeviceGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ }\r
+ //\r
+ // If the device path is an instance in the StdErr environment variable,\r
+ // then install EfiStandardErrorDeviceGuid onto ControllerHandle\r
+ //\r
+ Status = ConPlatformUpdateDeviceVariable (\r
+ VarErrorOut,\r
+ DevicePath,\r
+ CHECK\r
+ );\r
+ if (!EFI_ERROR (Status)) {\r
+ NeedClose = FALSE;\r
+ gBS->InstallMultipleProtocolInterfaces (\r
+ &ControllerHandle,\r
+ &gEfiStandardErrorDeviceGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ }\r
+\r
+ if (NeedClose) {\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextOutProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+ }\r
+ }\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+STATIC\r
+EFI_STATUS\r
+EFIAPI\r
+ConPlatformDriverBindingStop (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN UINTN NumberOfChildren,\r
+ IN EFI_HANDLE *ChildHandleBuffer\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+\r
+Arguments:\r
+ (Standard DriverBinding Protocol Stop() function)\r
+\r
+Returns:\r
+\r
+ None\r
+\r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+\r
+ //\r
+ // hot plug device is not included into the console associated variables,\r
+ // so no need to check variable for those hot plug devices.\r
+ //\r
+ if (!IsHotPlugDevice (This->DriverBindingHandle, ControllerHandle)) {\r
+ //\r
+ // Get the Device Path Protocol so the environment variables can be updated\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDevicePathProtocolGuid,\r
+ (VOID **) &DevicePath,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
+ );\r
+ if (!EFI_ERROR (Status)) {\r
+ //\r
+ // Remove DevicePath from ConInDev, ConOutDev, and StdErrDev\r
+ //\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarConsoleInpDev,\r
+ DevicePath,\r
+ DELETE\r
+ );\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarConsoleOutDev,\r
+ DevicePath,\r
+ DELETE\r
+ );\r
+ ConPlatformUpdateDeviceVariable (\r
+ VarErrorOutDev,\r
+ DevicePath,\r
+ DELETE\r
+ );\r
+ }\r
+ }\r
+ //\r
+ // Uninstall the Console Device GUIDs from Controller Handle\r
+ //\r
+ ConPlatformUnInstallProtocol (\r
+ This,\r
+ ControllerHandle,\r
+ &gEfiConsoleInDeviceGuid\r
+ );\r
+\r
+ ConPlatformUnInstallProtocol (\r
+ This,\r
+ ControllerHandle,\r
+ &gEfiConsoleOutDeviceGuid\r
+ );\r
+\r
+ ConPlatformUnInstallProtocol (\r
+ This,\r
+ ControllerHandle,\r
+ &gEfiStandardErrorDeviceGuid\r
+ );\r
+\r
+ //\r
+ // Close the Simple Input and Simple Text Output Protocols\r
+ //\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextInProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiSimpleTextOutProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+VOID\r
+ConPlatformUnInstallProtocol (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE Handle,\r
+ IN EFI_GUID *ProtocolGuid\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ Status = gBS->OpenProtocol (\r
+ Handle,\r
+ ProtocolGuid,\r
+ NULL,\r
+ This->DriverBindingHandle,\r
+ Handle,\r
+ EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
+ );\r
+\r
+ if (!EFI_ERROR (Status)) {\r
+ gBS->UninstallMultipleProtocolInterfaces (\r
+ Handle,\r
+ ProtocolGuid,\r
+ NULL,\r
+ NULL\r
+ );\r
+ }\r
+\r
+ return ;\r
+}\r
+\r
+VOID *\r
+ConPlatformGetVariable (\r
+ IN CHAR16 *Name\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ Read the EFI variable (Name) and return a dynamically allocated\r
+ buffer, and the size of the buffer. On failure return NULL.\r
+\r
+Arguments:\r
+ Name - String part of EFI variable name\r
+\r
+Returns:\r
+ Dynamically allocated memory that contains a copy of the EFI variable.\r
+ Caller is repsoncible freeing the buffer.\r
+\r
+ NULL - Variable was not read\r
+ \r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ VOID *Buffer;\r
+ UINTN BufferSize;\r
+\r
+ BufferSize = 0;\r
+ Buffer = NULL;\r
+\r
+ //\r
+ // Test to see if the variable exists. If it doesn't reuturn NULL\r
+ //\r
+ Status = gRT->GetVariable (\r
+ Name,\r
+ &gEfiGlobalVariableGuid,\r
+ NULL,\r
+ &BufferSize,\r
+ Buffer\r
+ );\r
+\r
+ if (Status == EFI_BUFFER_TOO_SMALL) {\r
+ //\r
+ // Allocate the buffer to return\r
+ //\r
+ Status = gBS->AllocatePool (EfiBootServicesData, BufferSize, &Buffer);\r
+ if (EFI_ERROR (Status)) {\r
+ return NULL;\r
+ }\r
+ //\r
+ // Read variable into the allocated buffer.\r
+ //\r
+ Status = gRT->GetVariable (\r
+ Name,\r
+ &gEfiGlobalVariableGuid,\r
+ NULL,\r
+ &BufferSize,\r
+ Buffer\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ gBS->FreePool (Buffer);\r
+ Buffer = NULL;\r
+ }\r
+ }\r
+\r
+ return Buffer;\r
+}\r
+\r
+EFI_STATUS\r
+ConPlatformMatchDevicePaths (\r
+ IN EFI_DEVICE_PATH_PROTOCOL * Multi,\r
+ IN EFI_DEVICE_PATH_PROTOCOL * Single,\r
+ IN EFI_DEVICE_PATH_PROTOCOL **NewDevicePath OPTIONAL,\r
+ IN BOOLEAN Delete\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ Function compares a device path data structure to that of all the nodes of a\r
+ second device path instance.\r
+\r
+Arguments:\r
+ Multi - A pointer to a multi-instance device path data structure.\r
+\r
+ Single - A pointer to a single-instance device path data structure.\r
+ \r
+ NewDevicePath - If Delete is TRUE, this parameter must not be null, and it\r
+ points to the remaining device path data structure. \r
+ (remaining device path = Multi - Single.)\r
+ \r
+ Delete - If TRUE, means removing Single from Multi.\r
+ If FALSE, the routine just check whether Single matches \r
+ with any instance in Multi.\r
+\r
+Returns:\r
+\r
+ The function returns EFI_SUCCESS if the Single is contained within Multi. \r
+ Otherwise, EFI_NOT_FOUND is returned.\r
+\r
+--*/\r
+{\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;\r
+ EFI_DEVICE_PATH_PROTOCOL *TempDevicePath1;\r
+ EFI_DEVICE_PATH_PROTOCOL *TempDevicePath2;\r
+ EFI_DEVICE_PATH_PROTOCOL *DevicePathInst;\r
+ UINTN Size;\r
+\r
+ //\r
+ // The passed in DevicePath should not be NULL\r
+ //\r
+ if ((!Multi) || (!Single)) {\r
+ return EFI_NOT_FOUND;\r
+ }\r
+ //\r
+ // if performing Delete operation, the NewDevicePath must not be NULL.\r
+ //\r
+ TempDevicePath1 = NULL;\r
+\r
+ DevicePath = Multi;\r
+ DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);\r
+\r
+ //\r
+ // search for the match of 'Single' in 'Multi'\r
+ //\r
+ while (DevicePathInst) {\r
+ if (CompareMem (Single, DevicePathInst, Size) == 0) {\r
+ if (!Delete) {\r
+ gBS->FreePool (DevicePathInst);\r
+ return EFI_SUCCESS;\r
+ }\r
+ } else {\r
+ if (Delete) {\r
+ TempDevicePath2 = AppendDevicePathInstance (\r
+ TempDevicePath1,\r
+ DevicePathInst\r
+ );\r
+ gBS->FreePool (TempDevicePath1);\r
+ TempDevicePath1 = TempDevicePath2;\r
+ }\r
+ }\r
+\r
+ gBS->FreePool (DevicePathInst);\r
+ DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);\r
+ }\r
+\r
+ if (Delete) {\r
+ *NewDevicePath = TempDevicePath1;\r
+ return EFI_SUCCESS;\r
+ }\r
+\r
+ return EFI_NOT_FOUND;\r
+}\r
+\r
+EFI_STATUS\r
+ConPlatformUpdateDeviceVariable (\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,\r
+ IN CONPLATFORM_VAR_OPERATION Operation\r
+ )\r
+/*++\r
+\r
+Routine Description:\r
+ \r
+\r
+Arguments:\r
+\r
+Returns:\r
+\r
+ None\r
+\r
+--*/\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_DEVICE_PATH_PROTOCOL *VariableDevicePath;\r
+ EFI_DEVICE_PATH_PROTOCOL *NewVariableDevicePath;\r
+\r
+ VariableDevicePath = NULL;\r
+ NewVariableDevicePath = NULL;\r
+\r
+ //\r
+ // Get Variable according to variable name.\r
+ // The memory for Variable is allocated within ConPlatformGetVarible(),\r
+ // it is the caller's responsibility to free the memory before return.\r
+ //\r
+ VariableDevicePath = ConPlatformGetVariable (VariableName);\r
+\r
+ if (Operation != DELETE) {\r
+\r
+ Status = ConPlatformMatchDevicePaths (\r
+ VariableDevicePath,\r
+ DevicePath,\r
+ NULL,\r
+ FALSE\r
+ );\r
+\r
+ if ((Operation == CHECK) || (!EFI_ERROR (Status))) {\r
+ //\r
+ // The device path is already in the variable\r
+ //\r
+ gBS->FreePool (VariableDevicePath);\r
+\r
+ return Status;\r
+ }\r
+ //\r
+ // The device path is not in variable. Append DevicePath to the\r
+ // environment variable that is a multi-instance device path.\r
+ //\r
+ Status = EFI_SUCCESS;\r
+ NewVariableDevicePath = AppendDevicePathInstance (\r
+ VariableDevicePath,\r
+ DevicePath\r
+ );\r
+ if (NewVariableDevicePath == NULL) {\r
+ Status = EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ } else {\r
+ //\r
+ // Remove DevicePath from the environment variable that\r
+ // is a multi-instance device path.\r
+ //\r
+ Status = ConPlatformMatchDevicePaths (\r
+ VariableDevicePath,\r
+ DevicePath,\r
+ &NewVariableDevicePath,\r
+ TRUE\r
+ );\r
+ }\r
+\r
+ gBS->FreePool (VariableDevicePath);\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ Status = gRT->SetVariable (\r
+ VariableName,\r
+ &gEfiGlobalVariableGuid,\r
+ EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r
+ GetDevicePathSize (NewVariableDevicePath),\r
+ NewVariableDevicePath\r
+ );\r
+\r
+ gBS->FreePool (NewVariableDevicePath);\r
+\r
+ return Status;\r
+}\r
+\r
+BOOLEAN\r
+IsHotPlugDevice (\r
+ EFI_HANDLE DriverBindingHandle,\r
+ EFI_HANDLE ControllerHandle\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ //\r
+ // HotPlugDeviceGuid indicates ControllerHandle stands for a hot plug device.\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiHotPlugDeviceGuid,\r
+ NULL,\r
+ DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return FALSE;\r
+ }\r
+\r
+ return TRUE;\r
+}\r
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