/*++
Caution: This file is used for Duet platform only, do not use them in real platform.
All variable code, variable metadata, and variable data used by Duet platform are on
disk. They can be changed by user. BIOS is not able to protoect those.
Duet trusts all meta data from disk. If variable code, variable metadata and variable
data is modified in inproper way, the behavior is undefined.
Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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:
FileStorage.c
Abstract:
handles variable store/reads on file
Revision History
--*/
#include "FSVariable.h"
VOID *mSFSRegistration;
//
// Prototypes
//
VOID
EFIAPI
OnVirtualAddressChangeFs (
IN EFI_EVENT Event,
IN VOID *Context
);
EFI_STATUS
EFIAPI
FileEraseStore(
IN VARIABLE_STORAGE *This
);
EFI_STATUS
EFIAPI
FileWriteStore (
IN VARIABLE_STORAGE *This,
IN UINTN Offset,
IN UINTN BufferSize,
IN VOID *Buffer
);
EFI_STATUS
OpenStore (
IN EFI_DEVICE_PATH_PROTOCOL *Device,
IN CHAR16 *FilePathName,
IN UINT64 OpenMode,
OUT EFI_FILE_PROTOCOL **File
);
//
// Implementation below:
//
VOID
FileClose (
IN EFI_FILE_PROTOCOL *File
)
{
EFI_STATUS Status;
Status = File->Flush (File);
ASSERT_EFI_ERROR (Status);
Status = File->Close (File);
ASSERT_EFI_ERROR (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, "FileStorage: Media not present!\n"));
Status = EFI_NO_MEDIA;
goto ErrHandle;
}
if (BlkIo->Media->ReadOnly) {
DEBUG ((EFI_D_ERROR, "FileStorage: 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,
(VOID **) &Volume
);
if (EFI_ERROR (Status)) {
return Status;
}
return EFI_SUCCESS;
}
// this routine is still running in BS period, no limitation
// call FileInitStorage(), which load variable content file to memory
// read the store_header, init store_header if it has not been inited (read sth. about format/heathy)
// reclaim space using scratch memory
VOID
EFIAPI
OnSimpleFileSystemInstall (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
UINTN HandleSize;
EFI_HANDLE Handle;
EFI_DEVICE_PATH_PROTOCOL *Device;
VS_DEV *Dev;
EFI_FILE_PROTOCOL *File;
UINTN NumBytes;
Dev = (VS_DEV *) Context;
if (VAR_FILE_DEVICEPATH (Dev) != NULL &&
!EFI_ERROR (CheckStoreExists (VAR_FILE_DEVICEPATH (Dev)))
) {
DEBUG ((EFI_D_ERROR, "FileStorage: Already mapped!\n"));
return ;
}
while (TRUE) {
HandleSize = sizeof (EFI_HANDLE);
Status = gBS->LocateHandle (
ByRegisterNotify,
NULL,
mSFSRegistration,
&HandleSize,
&Handle
);
if (EFI_ERROR (Status)) {
return ;
}
Status = CheckStore (Handle, VAR_FILE_VOLUMEID (Dev), &Device);
if (!EFI_ERROR (Status)) {
break;
}
}
VAR_FILE_DEVICEPATH (Dev) = Device;
Status = OpenStore (
VAR_FILE_DEVICEPATH (Dev),
VAR_FILE_FILEPATH (Dev),
EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ | EFI_FILE_MODE_CREATE,
&File
);
ASSERT_EFI_ERROR (Status);
NumBytes = Dev->Size;
Status = File->Write (File, &NumBytes, VAR_DATA_PTR (Dev));
ASSERT_EFI_ERROR (Status);
FileClose (File);
DEBUG ((EFI_D_ERROR, "FileStorage: Mapped to file!\n"));
}
EFI_STATUS
FileStorageConstructor (
OUT VARIABLE_STORAGE **VarStore,
OUT EFI_EVENT_NOTIFY *GoVirtualEvent,
IN EFI_PHYSICAL_ADDRESS NvStorageBase,
IN UINTN Size,
IN UINT32 VolumeId,
IN CHAR16 *FilePath
)
{
VS_DEV *Dev;
EFI_STATUS Status;
EFI_EVENT Event;
Status = gBS->AllocatePool (EfiRuntimeServicesData, sizeof(VS_DEV), (VOID **) &Dev);
ASSERT_EFI_ERROR (Status);
ZeroMem (Dev, sizeof(VS_DEV));
Dev->Signature = VS_DEV_SIGNATURE;
Dev->Size = Size;
VAR_DATA_PTR (Dev) = (UINT8 *) (UINTN) NvStorageBase;
VAR_FILE_VOLUMEID (Dev) = VolumeId;
StrCpy (VAR_FILE_FILEPATH (Dev), FilePath);
Dev->VarStore.Erase = FileEraseStore;
Dev->VarStore.Write = FileWriteStore;
DEBUG ((EFI_D_ERROR, "FileStorageConstructor(0x%0x:0x%0x): added!\n", NvStorageBase, Size));
// add notify on SFS's installation.
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
OnSimpleFileSystemInstall,
Dev,
&Event
);
ASSERT_EFI_ERROR (Status);
Status = gBS->RegisterProtocolNotify (
&gEfiSimpleFileSystemProtocolGuid,
Event,
&mSFSRegistration
);
ASSERT_EFI_ERROR (Status);
*VarStore = &Dev->VarStore;
*GoVirtualEvent = OnVirtualAddressChangeFs;
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
FileEraseStore(
IN VARIABLE_STORAGE *This
)
{
EFI_STATUS Status;
VS_DEV *Dev;
EFI_FILE_PROTOCOL *File;
UINTN NumBytes;
Status = EFI_SUCCESS;
Dev = DEV_FROM_THIS(This);
SetMem (VAR_DATA_PTR (Dev), Dev->Size, VAR_DEFAULT_VALUE);
if (!EfiAtRuntime () && VAR_FILE_DEVICEPATH (Dev) != NULL) {
Status = OpenStore (
VAR_FILE_DEVICEPATH (Dev),
VAR_FILE_FILEPATH (Dev),
EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ,
&File
);
ASSERT_EFI_ERROR (Status);
NumBytes = Dev->Size;
Status = File->Write (File, &NumBytes, VAR_DATA_PTR (Dev));
ASSERT_EFI_ERROR (Status);
FileClose (File);
}
return Status;
}
EFI_STATUS
EFIAPI
FileWriteStore (
IN VARIABLE_STORAGE *This,
IN UINTN Offset,
IN UINTN BufferSize,
IN VOID *Buffer
)
{
EFI_STATUS Status;
VS_DEV *Dev;
EFI_FILE_PROTOCOL *File;
Status = EFI_SUCCESS;
Dev = DEV_FROM_THIS(This);
ASSERT (Buffer != NULL);
ASSERT (Offset + BufferSize <= Dev->Size);
CopyMem (VAR_DATA_PTR (Dev) + Offset, Buffer, BufferSize);
if (!EfiAtRuntime () && VAR_FILE_DEVICEPATH (Dev) != NULL) {
Status = OpenStore (
VAR_FILE_DEVICEPATH (Dev),
VAR_FILE_FILEPATH (Dev),
EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ,
&File
);
Status = File->SetPosition (File, Offset);
ASSERT_EFI_ERROR (Status);
Status = File->Write (File, &BufferSize, Buffer);
ASSERT_EFI_ERROR (Status);
FileClose (File);
}
return Status;
}
VOID
EFIAPI
OnVirtualAddressChangeFs (
IN EFI_EVENT Event,
IN VOID *Context
)
{
VS_DEV *Dev;
Dev = DEV_FROM_THIS (Context);
EfiConvertPointer (0, (VOID **) &VAR_DATA_PTR (Dev));
EfiConvertPointer (0, (VOID **) &Dev->VarStore.Erase);
EfiConvertPointer (0, (VOID **) &Dev->VarStore.Write);
}
EFI_STATUS
OpenStore (
IN EFI_DEVICE_PATH_PROTOCOL *Device,
IN CHAR16 *FilePathName,
IN UINT64 OpenMode,
OUT EFI_FILE_PROTOCOL **File
)
{
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,
(VOID **) &Volume
);
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,
FilePathName,
OpenMode,
0
);
if (EFI_ERROR (Status)) {
*File = NULL;
}
//
// Close the Root directory
//
Root->Close (Root);
return Status;
}