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/**@file
Copyright (c) 2007 - 2009, 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:
FileIo.c
Abstract:
File operation for Firmware volume block driver
**/
#include "FileIo.h"
//
// Variable storage hot plug is supported but there are still some restrictions:
// After plugging the storage back,
// 1. Still use memory as NV if newly plugged storage is not same as the original one
// 2. Still use memory as NV if there are some update operation during storage is unplugged.
//
EFI_STATUS
FileWrite (
IN EFI_FILE_PROTOCOL *File,
IN UINTN Offset,
IN UINTN Buffer,
IN UINTN Size
)
{
EFI_STATUS Status;
Status = File->SetPosition (File, Offset);
ASSERT_EFI_ERROR (Status);
if (!EFI_ERROR (Status)) {
Status = File->Write (File, &Size, (VOID *) Buffer);
ASSERT_EFI_ERROR (Status);
}
return Status;
}
EFI_STATUS
CheckStore (
IN EFI_HANDLE SimpleFileSystemHandle,
IN UINT32 VolumeId,
OUT EFI_DEVICE_PATH_PROTOCOL **Device
)
{
#define BLOCK_SIZE 0x200
#define FAT16_VOLUME_ID_OFFSET 39
#define FAT32_VOLUME_ID_OFFSET 67
EFI_STATUS Status;
EFI_BLOCK_IO_PROTOCOL *BlkIo;
UINT8 BootSector[BLOCK_SIZE];
*Device = NULL;
Status = gBS->HandleProtocol (
SimpleFileSystemHandle,
&gEfiBlockIoProtocolGuid, // BlockIo should be supported if it supports SimpleFileSystem
(VOID*)&BlkIo
);
if (EFI_ERROR (Status)) {
goto ErrHandle;
}
if (!BlkIo->Media->MediaPresent) {
DEBUG ((EFI_D_ERROR, "FwhMappedFile: Media not present!\n"));
Status = EFI_NO_MEDIA;
goto ErrHandle;
}
if (BlkIo->Media->ReadOnly) {
DEBUG ((EFI_D_ERROR, "FwhMappedFile: Media is read-only!\n"));
Status = EFI_ACCESS_DENIED;
goto ErrHandle;
}
Status = BlkIo->ReadBlocks(
BlkIo,
BlkIo->Media->MediaId,
0,
BLOCK_SIZE,
BootSector
);
ASSERT_EFI_ERROR (Status);
if ((*(UINT32 *) &BootSector[FAT16_VOLUME_ID_OFFSET] != VolumeId) &&
(*(UINT32 *) &BootSector[FAT32_VOLUME_ID_OFFSET] != VolumeId)
) {
Status = EFI_NOT_FOUND;
goto ErrHandle;
}
*Device = DuplicateDevicePath (DevicePathFromHandle (SimpleFileSystemHandle));
ASSERT (*Device != NULL);
ErrHandle:
return Status;
}
EFI_STATUS
CheckStoreExists (
IN EFI_DEVICE_PATH_PROTOCOL *Device
)
{
EFI_HANDLE Handle;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_STATUS Status;
Status = gBS->LocateDevicePath (
&gEfiSimpleFileSystemProtocolGuid,
&Device,
&Handle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->HandleProtocol (
Handle,
&gEfiSimpleFileSystemProtocolGuid,
&Volume
);
if (EFI_ERROR (Status)) {
return Status;
}
return EFI_SUCCESS;
}
VOID
FileClose (
IN EFI_FILE_PROTOCOL *File
)
{
File->Flush (File);
File->Close (File);
}
EFI_STATUS
FileOpen (
IN EFI_DEVICE_PATH_PROTOCOL *Device,
IN CHAR16 *MappedFile,
OUT EFI_FILE_PROTOCOL **File,
IN UINT64 OpenMode
)
{
EFI_HANDLE Handle;
EFI_FILE_HANDLE Root;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_STATUS Status;
*File = NULL;
Status = gBS->LocateDevicePath (
&gEfiSimpleFileSystemProtocolGuid,
&Device,
&Handle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->HandleProtocol (
Handle,
&gEfiSimpleFileSystemProtocolGuid,
&Volume
);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Open the root directory of the volume
//
Root = NULL;
Status = Volume->OpenVolume (
Volume,
&Root
);
ASSERT_EFI_ERROR (Status);
ASSERT (Root != NULL);
//
// Open file
//
Status = Root->Open (
Root,
File,
MappedFile,
OpenMode,
0
);
if (EFI_ERROR (Status)) {
*File = NULL;
}
//
// Close the Root directory
//
Root->Close (Root);
return Status;
}
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