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/** @file
*
* Copyright (c) 2011, ARM Limited. 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.
*
**/
#include "BdsInternal.h"
// Count the number of DevicePath Node
static UINTN NumberNodeFromDevicePath(
IN EFI_DEVICE_PATH_PROTOCOL* DevicePath
) {
UINTN NumberDevicePathNode = 0;
while (!IsDevicePathEnd (DevicePath)) {
NumberDevicePathNode++;
DevicePath = NextDevicePathNode(DevicePath);
}
return NumberDevicePathNode;
}
// Extract the FilePath from the Device Path
CHAR16* BdsExtractFilePathFromDevicePath(
IN CONST CHAR16 *StrDevicePath,
IN UINTN NumberDevicePathNode
) {
UINTN Node;
CHAR16 *Str;
Str = (CHAR16*)StrDevicePath;
Node = 0;
while ((Str != NULL) && (*Str != L'\0') && (Node < NumberDevicePathNode)) {
if ((*Str == L'/') || (*Str == L'\\')) {
Node++;
}
Str++;
}
if (*Str == L'\0') {
return NULL;
} else {
return Str;
}
}
EFI_STATUS
BdsLoadDevicePath(
IN EFI_DEVICE_PATH_PROTOCOL* DevicePath,
OUT EFI_HANDLE *Handle
) {
EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath;
EFI_STATUS Status;
if ((DevicePath == NULL) || (Handle == NULL)) {
return EFI_INVALID_PARAMETER;
}
do {
RemainingDevicePath = DevicePath;
// The LocateDevicePath() function locates all devices on DevicePath that support Protocol and returns
// the handle to the device that is closest to DevicePath. On output, the device path pointer is modified
// to point to the remaining part of the device path
Status = gBS->LocateDevicePath(&gEfiDevicePathProtocolGuid,&RemainingDevicePath,Handle);
if (!EFI_ERROR (Status)) {
// Recursive = FALSE: We do not want to start all the device tree
Status = gBS->ConnectController (*Handle, NULL, RemainingDevicePath, FALSE);
}
// We need to check if RemainingDevicePath does not point on the last node. Otherwise, calling
// NextDevicePathNode() will return an undetermined Device Path Node
if (!IsDevicePathEnd (RemainingDevicePath)) {
RemainingDevicePath = NextDevicePathNode (RemainingDevicePath);
}
} while (!EFI_ERROR (Status) && !IsDevicePathEnd (RemainingDevicePath));
if (!EFI_ERROR (Status)) {
// Now, we have got the whole Device Path connected, call again ConnectController to ensure all the supported Driver
// Binding Protocol are connected (such as DiskIo and SimpleFileSystem)
RemainingDevicePath = DevicePath;
Status = gBS->LocateDevicePath(&gEfiDevicePathProtocolGuid,&RemainingDevicePath,Handle);
if (!EFI_ERROR (Status)) {
Status = gBS->ConnectController (*Handle, NULL, RemainingDevicePath, FALSE);
if (EFI_ERROR (Status)) {
// If the last node is a Memory Map Device Path just return EFI_SUCCESS.
if ((RemainingDevicePath->Type == HARDWARE_DEVICE_PATH) && (RemainingDevicePath->SubType == HW_MEMMAP_DP)) {
Status = EFI_SUCCESS;
}
}
}
} else if (IsDevicePathEnd (RemainingDevicePath)) {
// Case when the DevicePath contains a MemoryMap Device Path Node and all drivers are connected.
// Ensure the Device Path exists
RemainingDevicePath = DevicePath;
Status = gBS->LocateDevicePath(&gEfiDevicePathProtocolGuid,&RemainingDevicePath,Handle);
}
return Status;
}
EFI_STATUS
BdsLoadFilePath (
IN CONST CHAR16 *DeviceFilePath,
OUT BDS_FILE *File
) {
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL *EfiDevicePathFromTextProtocol;
EFI_STATUS Status;
EFI_HANDLE Handle;
UINTN NumberDevicePathNode;
CHAR16 *FilePath;
//Do a sanity check on the Device file path
if (DeviceFilePath == NULL) {
return EFI_INVALID_PARAMETER;
}
// Convert the Device Path String into Device Path Protocol
Status = gBS->LocateProtocol(&gEfiDevicePathFromTextProtocolGuid, NULL, (VOID **)&EfiDevicePathFromTextProtocol);
ASSERT_EFI_ERROR(Status);
DevicePath = EfiDevicePathFromTextProtocol->ConvertTextToDevicePath(DeviceFilePath);
//Do a sanity check on the Device Path
if (DevicePath == NULL) {
return EFI_INVALID_PARAMETER;
}
// Count the number of DevicePath Node
NumberDevicePathNode = NumberNodeFromDevicePath(DevicePath);
// Extract the FilePath from the Device Path
FilePath = BdsExtractFilePathFromDevicePath(DeviceFilePath,NumberDevicePathNode);
Status = BdsLoadDevicePath(DevicePath,&Handle);
if (EFI_ERROR (Status)) {
return Status;
}
//If FilePath == NULL then let consider if a MemoryMap Device Path
if (FilePath == NULL) {
// Check if the Node is a MemoryMap Device Path
Status = BdsLoadFileFromMemMap(Handle,DevicePath,File);
} else {
Status = BdsLoadFileFromSimpleFileSystem(Handle,FilePath,File);
if (EFI_ERROR (Status)) {
Status = BdsLoadFileFromFirmwareVolume(Handle,FilePath,EFI_FV_FILETYPE_ALL,File);
}
}
if (!EFI_ERROR (Status)) {
File->DevicePath = DevicePath;
}
return Status;
}
EFI_STATUS BdsCopyRawFileToRuntimeMemory(
IN BDS_FILE *File,
OUT VOID **FileImage,
OUT UINTN *FileSize
) {
if (File == NULL) {
return EFI_INVALID_PARAMETER;
}
if (File->Type == BDS_FILETYPE_FS) {
return BdsCopyRawFileToRuntimeMemoryFS(File->File.Fs.Handle,FileImage,FileSize);
} else if (File->Type == BDS_FILETYPE_FV) {
return BdsCopyRawFileToRuntimeMemoryFV(&(File->File.Fv),FileImage,FileSize);
} else if (File->Type == BDS_FILETYPE_MEM) {
return BdsCopyRawFileToRuntimeMemoryMemMap(&(File->File.Mem),FileImage,FileSize);
} else {
return EFI_INVALID_PARAMETER;
}
}
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