diff options
Diffstat (limited to 'EdkModulePkg/Universal/Disk/Partition/Dxe/Mbr.c')
| -rw-r--r-- | EdkModulePkg/Universal/Disk/Partition/Dxe/Mbr.c | 328 |
1 files changed, 0 insertions, 328 deletions
diff --git a/EdkModulePkg/Universal/Disk/Partition/Dxe/Mbr.c b/EdkModulePkg/Universal/Disk/Partition/Dxe/Mbr.c deleted file mode 100644 index d71698c826..0000000000 --- a/EdkModulePkg/Universal/Disk/Partition/Dxe/Mbr.c +++ /dev/null @@ -1,328 +0,0 @@ -/*++
-
-Copyright (c) 2006 - 2007, 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:
-
- Mbr.c
-
-Abstract:
-
- Decode a hard disk partitioned with the legacy MBR found on most PC's
-
- MBR - Master Boot Record is in the first sector of a partitioned hard disk.
- The MBR supports four partitions per disk. The MBR also contains legacy
- code that is not run on an EFI system. The legacy code reads the
- first sector of the active partition into memory and
-
- BPB - Boot(?) Parameter Block is in the first sector of a FAT file system.
- The BPB contains information about the FAT file system. The BPB is
- always on the first sector of a media. The first sector also contains
- the legacy boot strap code.
-
---*/
-
-#include "Partition.h"
-
-STATIC
-BOOLEAN
-PartitionValidMbr (
- IN MASTER_BOOT_RECORD *Mbr,
- IN EFI_LBA LastLba
- )
-/*++
-
-Routine Description:
- Test to see if the Mbr buffer is a valid MBR
-
-Arguments:
- Mbr - Parent Handle
- LastLba - Last Lba address on the device.
-
-Returns:
- TRUE - Mbr is a Valid MBR
- FALSE - Mbr is not a Valid MBR
-
---*/
-{
- UINT32 StartingLBA;
- UINT32 EndingLBA;
- UINT32 NewEndingLBA;
- INTN Index1;
- INTN Index2;
- BOOLEAN MbrValid;
-
- if (Mbr->Signature != MBR_SIGNATURE) {
- return FALSE;
- }
- //
- // The BPB also has this signature, so it can not be used alone.
- //
- MbrValid = FALSE;
- for (Index1 = 0; Index1 < MAX_MBR_PARTITIONS; Index1++) {
- if (Mbr->Partition[Index1].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) == 0) {
- continue;
- }
-
- MbrValid = TRUE;
- StartingLBA = UNPACK_UINT32 (Mbr->Partition[Index1].StartingLBA);
- EndingLBA = StartingLBA + UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) - 1;
- if (EndingLBA > LastLba) {
- //
- // Compatibility Errata:
- // Some systems try to hide drive space with their INT 13h driver
- // This does not hide space from the OS driver. This means the MBR
- // that gets created from DOS is smaller than the MBR created from
- // a real OS (NT & Win98). This leads to BlockIo->LastBlock being
- // wrong on some systems FDISKed by the OS.
- //
- // return FALSE since no block devices on a system are implemented
- // with INT 13h
- //
- return FALSE;
- }
-
- for (Index2 = Index1 + 1; Index2 < MAX_MBR_PARTITIONS; Index2++) {
- if (Mbr->Partition[Index2].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index2].SizeInLBA) == 0) {
- continue;
- }
-
- NewEndingLBA = UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) + UNPACK_UINT32 (Mbr->Partition[Index2].SizeInLBA) - 1;
- if (NewEndingLBA >= StartingLBA && UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) <= EndingLBA) {
- //
- // This region overlaps with the Index1'th region
- //
- return FALSE;
- }
- }
- }
- //
- // Non of the regions overlapped so MBR is O.K.
- //
- return MbrValid;
-}
-
-EFI_STATUS
-PartitionInstallMbrChildHandles (
- IN EFI_DRIVER_BINDING_PROTOCOL *This,
- IN EFI_HANDLE Handle,
- IN EFI_DISK_IO_PROTOCOL *DiskIo,
- IN EFI_BLOCK_IO_PROTOCOL *BlockIo,
- IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
- )
-/*++
-
-Routine Description:
- Install child handles if the Handle supports MBR format.
-
-Arguments:
- This - Calling context.
- Handle - Parent Handle
- DiskIo - Parent DiskIo interface
- BlockIo - Parent BlockIo interface
- DevicePath - Parent Device Path
-
-Returns:
- EFI_SUCCESS - If a child handle was added
- EFI_MEDIA_CHANGED - Media changed Detected
- !EFI_SUCCESS - Not found MBR partition.
-
---*/
-{
- EFI_STATUS Status;
- MASTER_BOOT_RECORD *Mbr;
- UINT32 ExtMbrStartingLba;
- UINTN Index;
- HARDDRIVE_DEVICE_PATH HdDev;
- HARDDRIVE_DEVICE_PATH ParentHdDev;
- EFI_STATUS Found;
- UINT32 PartitionNumber;
- EFI_DEVICE_PATH_PROTOCOL *DevicePathNode;
- EFI_DEVICE_PATH_PROTOCOL *LastDevicePathNode;
-
- Mbr = NULL;
- Found = EFI_NOT_FOUND;
-
- Mbr = AllocatePool (BlockIo->Media->BlockSize);
- if (Mbr == NULL) {
- goto Done;
- }
-
- Status = BlockIo->ReadBlocks (
- BlockIo,
- BlockIo->Media->MediaId,
- 0,
- BlockIo->Media->BlockSize,
- Mbr
- );
- if (EFI_ERROR (Status)) {
- Found = Status;
- goto Done;
- }
- if (!PartitionValidMbr (Mbr, BlockIo->Media->LastBlock)) {
- goto Done;
- }
- //
- // We have a valid mbr - add each partition
- //
- //
- // Get starting and ending LBA of the parent block device.
- //
- LastDevicePathNode = NULL;
- ZeroMem (&ParentHdDev, sizeof (ParentHdDev));
- DevicePathNode = DevicePath;
- while (!EfiIsDevicePathEnd (DevicePathNode)) {
- LastDevicePathNode = DevicePathNode;
- DevicePathNode = EfiNextDevicePathNode (DevicePathNode);
- }
-
- if (LastDevicePathNode != NULL) {
- if (DevicePathType (LastDevicePathNode) == MEDIA_DEVICE_PATH &&
- DevicePathSubType (LastDevicePathNode) == MEDIA_HARDDRIVE_DP
- ) {
- CopyMem (&ParentHdDev, LastDevicePathNode, sizeof (ParentHdDev));
- } else {
- LastDevicePathNode = NULL;
- }
- }
-
- PartitionNumber = 1;
-
- ZeroMem (&HdDev, sizeof (HdDev));
- HdDev.Header.Type = MEDIA_DEVICE_PATH;
- HdDev.Header.SubType = MEDIA_HARDDRIVE_DP;
- SetDevicePathNodeLength (&HdDev.Header, sizeof (HdDev));
- HdDev.MBRType = MBR_TYPE_PCAT;
- HdDev.SignatureType = SIGNATURE_TYPE_MBR;
-
- if (LastDevicePathNode == NULL) {
- //
- // This is a MBR, add each partition
- //
- for (Index = 0; Index < MAX_MBR_PARTITIONS; Index++) {
- if (Mbr->Partition[Index].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index].SizeInLBA) == 0) {
- //
- // Don't use null MBR entries
- //
- continue;
- }
-
- if (Mbr->Partition[Index].OSIndicator == PMBR_GPT_PARTITION) {
- //
- // This is the guard MBR for the GPT. If you ever see a GPT disk with zero partitions you can get here.
- // We can not produce an MBR BlockIo for this device as the MBR spans the GPT headers. So formating
- // this BlockIo would corrupt the GPT structures and require a recovery that would corrupt the format
- // that corrupted the GPT partition.
- //
- continue;
- }
-
- HdDev.PartitionNumber = PartitionNumber ++;
- HdDev.PartitionStart = UNPACK_UINT32 (Mbr->Partition[Index].StartingLBA);
- HdDev.PartitionSize = UNPACK_UINT32 (Mbr->Partition[Index].SizeInLBA);
- CopyMem (HdDev.Signature, &(Mbr->UniqueMbrSignature[0]), sizeof (UINT32));
-
- Status = PartitionInstallChildHandle (
- This,
- Handle,
- DiskIo,
- BlockIo,
- DevicePath,
- (EFI_DEVICE_PATH_PROTOCOL *) &HdDev,
- HdDev.PartitionStart,
- HdDev.PartitionStart + HdDev.PartitionSize - 1,
- MBR_SIZE,
- (BOOLEAN) (Mbr->Partition[Index].OSIndicator == EFI_PARTITION)
- );
-
- if (!EFI_ERROR (Status)) {
- Found = EFI_SUCCESS;
- }
- }
- } else {
- //
- // It's an extended partition. Follow the extended partition
- // chain to get all the logical drives
- //
- ExtMbrStartingLba = 0;
-
- do {
-
- Status = BlockIo->ReadBlocks (
- BlockIo,
- BlockIo->Media->MediaId,
- ExtMbrStartingLba,
- BlockIo->Media->BlockSize,
- Mbr
- );
- if (EFI_ERROR (Status)) {
- Found = Status;
- goto Done;
- }
-
- if (Mbr->Partition[0].OSIndicator == 0) {
- break;
- }
-
- if ((Mbr->Partition[0].OSIndicator == EXTENDED_DOS_PARTITION) ||
- (Mbr->Partition[0].OSIndicator == EXTENDED_WINDOWS_PARTITION)) {
- ExtMbrStartingLba = UNPACK_UINT32 (Mbr->Partition[0].StartingLBA);
- continue;
- }
- HdDev.PartitionNumber = PartitionNumber ++;
- HdDev.PartitionStart = UNPACK_UINT32 (Mbr->Partition[0].StartingLBA) + ExtMbrStartingLba + ParentHdDev.PartitionStart;
- HdDev.PartitionSize = UNPACK_UINT32 (Mbr->Partition[0].SizeInLBA);
- if ((HdDev.PartitionStart + HdDev.PartitionSize - 1 >= ParentHdDev.PartitionStart + ParentHdDev.PartitionSize) ||
- (HdDev.PartitionStart <= ParentHdDev.PartitionStart)) {
- break;
- }
-
- //
- // The signature in EBR(Extended Boot Record) should always be 0.
- //
- *((UINT32 *) &HdDev.Signature[0]) = 0;
-
- Status = PartitionInstallChildHandle (
- This,
- Handle,
- DiskIo,
- BlockIo,
- DevicePath,
- (EFI_DEVICE_PATH_PROTOCOL *) &HdDev,
- HdDev.PartitionStart - ParentHdDev.PartitionStart,
- HdDev.PartitionStart - ParentHdDev.PartitionStart + HdDev.PartitionSize - 1,
- MBR_SIZE,
- (BOOLEAN) (Mbr->Partition[0].OSIndicator == EFI_PARTITION)
- );
- if (!EFI_ERROR (Status)) {
- Found = EFI_SUCCESS;
- }
-
- if ((Mbr->Partition[1].OSIndicator != EXTENDED_DOS_PARTITION) &&
- (Mbr->Partition[1].OSIndicator != EXTENDED_WINDOWS_PARTITION)
- ) {
- break;
- }
-
- ExtMbrStartingLba = UNPACK_UINT32 (Mbr->Partition[1].StartingLBA);
- //
- // Don't allow partition to be self referencing
- //
- if (ExtMbrStartingLba == 0) {
- break;
- }
- } while (ExtMbrStartingLba < ParentHdDev.PartitionSize);
- }
-
-Done:
- FreePool (Mbr);
-
- return Found;
-}
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