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audk/FatPkg/EnhancedFatDxe/Init.c

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/** @file
Initialization routines.
Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Fat.h"
/**
Allocates volume structure, detects FAT file system, installs protocol,
and initialize cache.
@param Handle - The handle of parent device.
@param DiskIo - The DiskIo of parent device.
@param DiskIo2 - The DiskIo2 of parent device.
@param BlockIo - The BlockIo of parent device.
@retval EFI_SUCCESS - Allocate a new volume successfully.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory.
@return Others - Allocating a new volume failed.
**/
EFI_STATUS
FatAllocateVolume (
IN EFI_HANDLE Handle,
IN EFI_DISK_IO_PROTOCOL *DiskIo,
IN EFI_DISK_IO2_PROTOCOL *DiskIo2,
IN EFI_BLOCK_IO_PROTOCOL *BlockIo
)
{
EFI_STATUS Status;
FAT_VOLUME *Volume;
//
// Allocate a volume structure
//
Volume = AllocateZeroPool (sizeof (FAT_VOLUME));
if (Volume == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Initialize the structure
//
Volume->Signature = FAT_VOLUME_SIGNATURE;
Volume->Handle = Handle;
Volume->DiskIo = DiskIo;
Volume->DiskIo2 = DiskIo2;
Volume->BlockIo = BlockIo;
Volume->MediaId = BlockIo->Media->MediaId;
Volume->ReadOnly = BlockIo->Media->ReadOnly;
Volume->VolumeInterface.Revision = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
Volume->VolumeInterface.OpenVolume = FatOpenVolume;
InitializeListHead (&Volume->CheckRef);
InitializeListHead (&Volume->DirCacheList);
//
// Initialize Root Directory entry
//
Volume->RootDirEnt.FileString = Volume->RootFileString;
Volume->RootDirEnt.Entry.Attributes = FAT_ATTRIBUTE_DIRECTORY;
//
// Check to see if there's a file system on the volume
//
Status = FatOpenDevice (Volume);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Initialize cache
//
Status = FatInitializeDiskCache (Volume);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Install our protocol interfaces on the device's handle
//
Status = gBS->InstallMultipleProtocolInterfaces (
&Volume->Handle,
&gEfiSimpleFileSystemProtocolGuid,
&Volume->VolumeInterface,
NULL
);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Volume installed
//
DEBUG ((EFI_D_INIT, "Installed Fat filesystem on %p\n", Handle));
Volume->Valid = TRUE;
Done:
if (EFI_ERROR (Status)) {
FatFreeVolume (Volume);
}
return Status;
}
/**
Called by FatDriverBindingStop(), Abandon the volume.
@param Volume - The volume to be abandoned.
@retval EFI_SUCCESS - Abandoned the volume successfully.
@return Others - Can not uninstall the protocol interfaces.
**/
EFI_STATUS
FatAbandonVolume (
IN FAT_VOLUME *Volume
)
{
EFI_STATUS Status;
BOOLEAN LockedByMe;
//
// Uninstall the protocol interface.
//
if (Volume->Handle != NULL) {
Status = gBS->UninstallMultipleProtocolInterfaces (
Volume->Handle,
&gEfiSimpleFileSystemProtocolGuid,
&Volume->VolumeInterface,
NULL
);
if (EFI_ERROR (Status)) {
return Status;
}
}
LockedByMe = FALSE;
//
// Acquire the lock.
// If the caller has already acquired the lock (which
// means we are in the process of some Fat operation),
// we can not acquire again.
//
Status = FatAcquireLockOrFail ();
if (!EFI_ERROR (Status)) {
LockedByMe = TRUE;
}
//
// The volume is still being used. Hence, set error flag for all OFiles still in
// use. In two cases, we could get here. One is EFI_MEDIA_CHANGED, the other is
// EFI_NO_MEDIA.
//
if (Volume->Root != NULL) {
FatSetVolumeError (
Volume->Root,
Volume->BlockIo->Media->MediaPresent ? EFI_MEDIA_CHANGED : EFI_NO_MEDIA
);
}
Volume->Valid = FALSE;
//
// Release the lock.
// If locked by me, this means DriverBindingStop is NOT
// called within an on-going Fat operation, so we should
// take responsibility to cleanup and free the volume.
// Otherwise, the DriverBindingStop is called within an on-going
// Fat operation, we shouldn't check reference, so just let outer
// FatCleanupVolume do the task.
//
if (LockedByMe) {
FatCleanupVolume (Volume, NULL, EFI_SUCCESS, NULL);
FatReleaseLock ();
}
return EFI_SUCCESS;
}
/**
Detects FAT file system on Disk and set relevant fields of Volume.
@param Volume - The volume structure.
@retval EFI_SUCCESS - The Fat File System is detected successfully
@retval EFI_UNSUPPORTED - The volume is not FAT file system.
@retval EFI_VOLUME_CORRUPTED - The volume is corrupted.
**/
EFI_STATUS
FatOpenDevice (
IN OUT FAT_VOLUME *Volume
)
{
EFI_STATUS Status;
UINT32 BlockSize;
UINT32 DirtyMask;
EFI_DISK_IO_PROTOCOL *DiskIo;
FAT_BOOT_SECTOR FatBs;
FAT_VOLUME_TYPE FatType;
UINTN RootDirSectors;
UINTN FatLba;
UINTN RootLba;
UINTN FirstClusterLba;
UINTN Sectors;
UINTN SectorsPerFat;
UINT8 SectorsPerClusterAlignment;
UINT8 BlockAlignment;
//
// Read the FAT_BOOT_SECTOR BPB info
// This is the only part of FAT code that uses parent DiskIo,
// Others use FatDiskIo which utilizes a Cache.
//
DiskIo = Volume->DiskIo;
Status = DiskIo->ReadDisk (DiskIo, Volume->MediaId, 0, sizeof (FatBs), &FatBs);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_INIT, "FatOpenDevice: read of part_lba failed %r\n", Status));
return Status;
}
FatType = FatUndefined;
//
// Use LargeSectors if Sectors is 0
//
Sectors = FatBs.FatBsb.Sectors;
if (Sectors == 0) {
Sectors = FatBs.FatBsb.LargeSectors;
}
SectorsPerFat = FatBs.FatBsb.SectorsPerFat;
if (SectorsPerFat == 0) {
SectorsPerFat = FatBs.FatBse.Fat32Bse.LargeSectorsPerFat;
FatType = Fat32;
}
//
// Is boot sector a fat sector?
// (Note that so far we only know if the sector is FAT32 or not, we don't
// know if the sector is Fat16 or Fat12 until later when we can compute
// the volume size)
//
if (FatBs.FatBsb.ReservedSectors == 0 || FatBs.FatBsb.NumFats == 0 || Sectors == 0) {
return EFI_UNSUPPORTED;
}
if ((FatBs.FatBsb.SectorSize & (FatBs.FatBsb.SectorSize - 1)) != 0) {
return EFI_UNSUPPORTED;
}
BlockAlignment = (UINT8) HighBitSet32 (FatBs.FatBsb.SectorSize);
if (BlockAlignment > MAX_BLOCK_ALIGNMENT || BlockAlignment < MIN_BLOCK_ALIGNMENT) {
return EFI_UNSUPPORTED;
}
if ((FatBs.FatBsb.SectorsPerCluster & (FatBs.FatBsb.SectorsPerCluster - 1)) != 0) {
return EFI_UNSUPPORTED;
}
SectorsPerClusterAlignment = (UINT8) HighBitSet32 (FatBs.FatBsb.SectorsPerCluster);
if (SectorsPerClusterAlignment > MAX_SECTORS_PER_CLUSTER_ALIGNMENT) {
return EFI_UNSUPPORTED;
}
if (FatBs.FatBsb.Media <= 0xf7 &&
FatBs.FatBsb.Media != 0xf0 &&
FatBs.FatBsb.Media != 0x00 &&
FatBs.FatBsb.Media != 0x01
) {
return EFI_UNSUPPORTED;
}
//
// Initialize fields the volume information for this FatType
//
if (FatType != Fat32) {
if (FatBs.FatBsb.RootEntries == 0) {
return EFI_UNSUPPORTED;
}
//
// Unpack fat12, fat16 info
//
Volume->RootEntries = FatBs.FatBsb.RootEntries;
} else {
//
// If this is fat32, refuse to mount mirror-disabled volumes
//
if ((SectorsPerFat == 0 || FatBs.FatBse.Fat32Bse.FsVersion != 0) || (FatBs.FatBse.Fat32Bse.ExtendedFlags & 0x80)) {
return EFI_UNSUPPORTED;
}
//
// Unpack fat32 info
//
Volume->RootCluster = FatBs.FatBse.Fat32Bse.RootDirFirstCluster;
}
Volume->NumFats = FatBs.FatBsb.NumFats;
//
// Compute some fat locations
//
BlockSize = FatBs.FatBsb.SectorSize;
RootDirSectors = ((Volume->RootEntries * sizeof (FAT_DIRECTORY_ENTRY)) + (BlockSize - 1)) / BlockSize;
FatLba = FatBs.FatBsb.ReservedSectors;
RootLba = FatBs.FatBsb.NumFats * SectorsPerFat + FatLba;
FirstClusterLba = RootLba + RootDirSectors;
Volume->FatPos = FatLba * BlockSize;
Volume->FatSize = SectorsPerFat * BlockSize;
Volume->VolumeSize = LShiftU64 (Sectors, BlockAlignment);
Volume->RootPos = LShiftU64 (RootLba, BlockAlignment);
Volume->FirstClusterPos = LShiftU64 (FirstClusterLba, BlockAlignment);
Volume->MaxCluster = (Sectors - FirstClusterLba) >> SectorsPerClusterAlignment;
Volume->ClusterAlignment = (UINT8)(BlockAlignment + SectorsPerClusterAlignment);
Volume->ClusterSize = (UINTN)1 << (Volume->ClusterAlignment);
//
// If this is not a fat32, determine if it's a fat16 or fat12
//
if (FatType != Fat32) {
if (Volume->MaxCluster >= FAT_MAX_FAT16_CLUSTER) {
return EFI_VOLUME_CORRUPTED;
}
FatType = Volume->MaxCluster < FAT_MAX_FAT12_CLUSTER ? Fat12 : Fat16;
//
// fat12 & fat16 fat-entries are 2 bytes
//
Volume->FatEntrySize = sizeof (UINT16);
DirtyMask = FAT16_DIRTY_MASK;
} else {
if (Volume->MaxCluster < FAT_MAX_FAT16_CLUSTER) {
return EFI_VOLUME_CORRUPTED;
}
//
// fat32 fat-entries are 4 bytes
//
Volume->FatEntrySize = sizeof (UINT32);
DirtyMask = FAT32_DIRTY_MASK;
}
//
// Get the DirtyValue and NotDirtyValue
// We should keep the initial value as the NotDirtyValue
// in case the volume is dirty already
//
if (FatType != Fat12) {
Status = FatAccessVolumeDirty (Volume, ReadDisk, &Volume->NotDirtyValue);
if (EFI_ERROR (Status)) {
return Status;
}
Volume->DirtyValue = Volume->NotDirtyValue & DirtyMask;
}
//
// If present, read the fat hint info
//
if (FatType == Fat32) {
Volume->FreeInfoPos = FatBs.FatBse.Fat32Bse.FsInfoSector * BlockSize;
if (FatBs.FatBse.Fat32Bse.FsInfoSector != 0) {
FatDiskIo (Volume, ReadDisk, Volume->FreeInfoPos, sizeof (FAT_INFO_SECTOR), &Volume->FatInfoSector, NULL);
if (Volume->FatInfoSector.Signature == FAT_INFO_SIGNATURE &&
Volume->FatInfoSector.InfoBeginSignature == FAT_INFO_BEGIN_SIGNATURE &&
Volume->FatInfoSector.InfoEndSignature == FAT_INFO_END_SIGNATURE &&
Volume->FatInfoSector.FreeInfo.ClusterCount <= Volume->MaxCluster
) {
Volume->FreeInfoValid = TRUE;
}
}
}
//
// Just make up a FreeInfo.NextCluster for use by allocate cluster
//
if (FAT_MIN_CLUSTER > Volume->FatInfoSector.FreeInfo.NextCluster ||
Volume->FatInfoSector.FreeInfo.NextCluster > Volume->MaxCluster + 1
) {
Volume->FatInfoSector.FreeInfo.NextCluster = FAT_MIN_CLUSTER;
}
//
// We are now defining FAT Type
//
Volume->FatType = FatType;
ASSERT (FatType != FatUndefined);
return EFI_SUCCESS;
}
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