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FatPkg: Break down Part.c file.
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1470 Break down partition parsing logic to 2 parts, Eltorito and MBR. Cc: Ruiyu Ni <ray.ni@intel.com> Cc: Zhang Chao B <chao.b.zhang@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Chen A Chen <chen.a.chen@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>
This commit is contained in:
Chen A Chen
Hao Wu
parent
8a9301cdd7
commit
6aac772c56
239
FatPkg/FatPei/Eltorito.c
Normal file
239
FatPkg/FatPei/Eltorito.c
Normal file
@ -0,0 +1,239 @@
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/** @file
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Routines supporting partition discovery and
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logical device reading
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <IndustryStandard/ElTorito.h>
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#include "FatLitePeim.h"
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/**
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This function finds Eltorito partitions. Main algorithm
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is ported from DXE partition driver.
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@param[in] PrivateData The global memory map
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@param[in] ParentBlockDevNo The parent block device
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@retval TRUE New partitions are detected and logical block devices
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are added to block device array
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@retval FALSE No new partitions are added
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**/
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BOOLEAN
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FatFindEltoritoPartitions (
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IN PEI_FAT_PRIVATE_DATA *PrivateData,
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IN UINTN ParentBlockDevNo
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)
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{
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EFI_STATUS Status;
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BOOLEAN Found;
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PEI_FAT_BLOCK_DEVICE *BlockDev;
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PEI_FAT_BLOCK_DEVICE *ParentBlockDev;
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UINT32 VolDescriptorLba;
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UINT32 Lba;
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CDROM_VOLUME_DESCRIPTOR *VolDescriptor;
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ELTORITO_CATALOG *Catalog;
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UINTN Check;
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UINTN Index;
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UINTN MaxIndex;
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UINT16 *CheckBuffer;
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UINT32 SubBlockSize;
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UINT32 SectorCount;
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UINT32 VolSpaceSize;
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if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {
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return FALSE;
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}
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Found = FALSE;
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ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);
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VolSpaceSize = 0;
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//
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// CD_ROM has the fixed block size as 2048 bytes
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//
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if (ParentBlockDev->BlockSize != 2048) {
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return FALSE;
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}
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VolDescriptor = (CDROM_VOLUME_DESCRIPTOR *) PrivateData->BlockData;
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Catalog = (ELTORITO_CATALOG *) VolDescriptor;
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//
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// the ISO-9660 volume descriptor starts at 32k on the media
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// and CD_ROM has the fixed block size as 2048 bytes, so...
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//
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VolDescriptorLba = 15;
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//
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// ((16*2048) / Media->BlockSize) - 1;
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//
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// Loop: handle one volume descriptor per time
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//
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while (TRUE) {
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VolDescriptorLba += 1;
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if (VolDescriptorLba > ParentBlockDev->LastBlock) {
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//
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// We are pointing past the end of the device so exit
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//
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break;
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}
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Status = FatReadBlock (
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PrivateData,
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ParentBlockDevNo,
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VolDescriptorLba,
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ParentBlockDev->BlockSize,
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VolDescriptor
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);
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if (EFI_ERROR (Status)) {
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break;
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}
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//
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// Check for valid volume descriptor signature
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//
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if (VolDescriptor->Unknown.Type == CDVOL_TYPE_END ||
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CompareMem (VolDescriptor->Unknown.Id, CDVOL_ID, sizeof (VolDescriptor->Unknown.Id)) != 0
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) {
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//
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// end of Volume descriptor list
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//
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break;
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}
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//
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// Read the Volume Space Size from Primary Volume Descriptor 81-88 byte
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//
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if (VolDescriptor->Unknown.Type == CDVOL_TYPE_CODED) {
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VolSpaceSize = VolDescriptor->PrimaryVolume.VolSpaceSize[1];
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}
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//
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// Is it an El Torito volume descriptor?
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//
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if (CompareMem (
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VolDescriptor->BootRecordVolume.SystemId,
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CDVOL_ELTORITO_ID,
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sizeof (CDVOL_ELTORITO_ID) - 1
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) != 0) {
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continue;
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}
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//
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// Read in the boot El Torito boot catalog
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//
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Lba = UNPACK_INT32 (VolDescriptor->BootRecordVolume.EltCatalog);
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if (Lba > ParentBlockDev->LastBlock) {
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continue;
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}
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Status = FatReadBlock (
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PrivateData,
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ParentBlockDevNo,
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Lba,
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ParentBlockDev->BlockSize,
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Catalog
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);
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if (EFI_ERROR (Status)) {
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continue;
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}
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//
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// We don't care too much about the Catalog header's contents, but we do want
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// to make sure it looks like a Catalog header
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//
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if (Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG || Catalog->Catalog.Id55AA != 0xAA55) {
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continue;
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}
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Check = 0;
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CheckBuffer = (UINT16 *) Catalog;
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for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {
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Check += CheckBuffer[Index];
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}
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if ((Check & 0xFFFF) != 0) {
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continue;
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}
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MaxIndex = ParentBlockDev->BlockSize / sizeof (ELTORITO_CATALOG);
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for (Index = 1; Index < MaxIndex; Index += 1) {
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//
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// Next entry
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//
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Catalog += 1;
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//
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// Check this entry
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//
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if (Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE || Catalog->Boot.Lba == 0) {
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continue;
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}
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SubBlockSize = 512;
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SectorCount = Catalog->Boot.SectorCount;
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switch (Catalog->Boot.MediaType) {
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case ELTORITO_NO_EMULATION:
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SubBlockSize = ParentBlockDev->BlockSize;
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SectorCount = Catalog->Boot.SectorCount;
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break;
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case ELTORITO_HARD_DISK:
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break;
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case ELTORITO_12_DISKETTE:
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SectorCount = 0x50 * 0x02 * 0x0F;
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break;
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case ELTORITO_14_DISKETTE:
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SectorCount = 0x50 * 0x02 * 0x12;
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break;
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case ELTORITO_28_DISKETTE:
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SectorCount = 0x50 * 0x02 * 0x24;
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break;
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default:
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SectorCount = 0;
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SubBlockSize = ParentBlockDev->BlockSize;
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break;
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}
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if (SectorCount < 2) {
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SectorCount = (VolSpaceSize > ParentBlockDev->LastBlock + 1) ? (UINT32) (ParentBlockDev->LastBlock - Catalog->Boot.Lba + 1) : (UINT32) (VolSpaceSize - Catalog->Boot.Lba);
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}
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//
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// Register this partition
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//
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if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {
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Found = TRUE;
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BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);
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BlockDev->BlockSize = SubBlockSize;
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BlockDev->LastBlock = SectorCount - 1;
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BlockDev->IoAlign = ParentBlockDev->IoAlign;
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BlockDev->Logical = TRUE;
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BlockDev->PartitionChecked = FALSE;
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BlockDev->StartingPos = MultU64x32 (Catalog->Boot.Lba, ParentBlockDev->BlockSize);
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BlockDev->ParentDevNo = ParentBlockDevNo;
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PrivateData->BlockDeviceCount++;
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}
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}
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}
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ParentBlockDev->PartitionChecked = TRUE;
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return Found;
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}
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@ -1,7 +1,7 @@
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## @file
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# Lite Fat driver only used in Pei Phase.
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#
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# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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# Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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#
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# This program and the accompanying materials are licensed and made available
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# under the terms and conditions of the BSD License which accompanies this
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@ -30,6 +30,8 @@
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#
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[Sources]
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Mbr.c
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Eltorito.c
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Part.c
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FatLiteApi.c
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FatLiteLib.c
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181
FatPkg/FatPei/Mbr.c
Normal file
181
FatPkg/FatPei/Mbr.c
Normal file
@ -0,0 +1,181 @@
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/** @file
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Routines supporting partition discovery and
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logical device reading
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <IndustryStandard/Mbr.h>
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#include "FatLitePeim.h"
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/**
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Test to see if the Mbr buffer is a valid MBR
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@param[in] Mbr Parent Handle
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@param[in] LastLba Last Lba address on the device.
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@retval TRUE Mbr is a Valid MBR
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@retval FALSE Mbr is not a Valid MBR
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**/
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BOOLEAN
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PartitionValidMbr (
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IN MASTER_BOOT_RECORD *Mbr,
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IN EFI_PEI_LBA LastLba
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)
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{
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UINT32 StartingLBA;
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UINT32 EndingLBA;
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UINT32 NewEndingLBA;
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INTN Index1;
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INTN Index2;
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BOOLEAN MbrValid;
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if (Mbr->Signature != MBR_SIGNATURE) {
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return FALSE;
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}
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//
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// The BPB also has this signature, so it can not be used alone.
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//
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MbrValid = FALSE;
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for (Index1 = 0; Index1 < MAX_MBR_PARTITIONS; Index1++) {
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if (Mbr->Partition[Index1].OSIndicator == 0x00 || UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) == 0) {
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continue;
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}
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MbrValid = TRUE;
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StartingLBA = UNPACK_UINT32 (Mbr->Partition[Index1].StartingLBA);
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EndingLBA = StartingLBA + UNPACK_UINT32 (Mbr->Partition[Index1].SizeInLBA) - 1;
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if (EndingLBA > LastLba) {
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//
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// Compatability Errata:
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// Some systems try to hide drive space with thier INT 13h driver
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// This does not hide space from the OS driver. This means the MBR
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// that gets created from DOS is smaller than the MBR created from
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// a real OS (NT & Win98). This leads to BlockIo->LastBlock being
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// wrong on some systems FDISKed by the OS.
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//
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// return FALSE Because no block devices on a system are implemented
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// with INT 13h
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//
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return FALSE;
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}
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for (Index2 = Index1 + 1; Index2 < MAX_MBR_PARTITIONS; Index2++) {
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if (Mbr->Partition[Index2].OSIndicator == 0x00 || UNPACK_INT32 (Mbr->Partition[Index2].SizeInLBA) == 0) {
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continue;
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}
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NewEndingLBA = UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) + UNPACK_UINT32 (Mbr->Partition[Index2].SizeInLBA) - 1;
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if (NewEndingLBA >= StartingLBA && UNPACK_UINT32 (Mbr->Partition[Index2].StartingLBA) <= EndingLBA) {
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//
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// This region overlaps with the Index1'th region
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//
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return FALSE;
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}
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}
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}
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//
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// Non of the regions overlapped so MBR is O.K.
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//
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return MbrValid;
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}
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/**
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This function finds Mbr partitions. Main algorithm
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is ported from DXE partition driver.
|
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@param[in] PrivateData The global memory map
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@param[in] ParentBlockDevNo The parent block device
|
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|
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@retval TRUE New partitions are detected and logical block devices
|
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are added to block device array
|
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@retval FALSE No new partitions are added
|
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|
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**/
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BOOLEAN
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FatFindMbrPartitions (
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IN PEI_FAT_PRIVATE_DATA *PrivateData,
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IN UINTN ParentBlockDevNo
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)
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{
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EFI_STATUS Status;
|
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MASTER_BOOT_RECORD *Mbr;
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UINTN Index;
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BOOLEAN Found;
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PEI_FAT_BLOCK_DEVICE *ParentBlockDev;
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PEI_FAT_BLOCK_DEVICE *BlockDev;
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|
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if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {
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return FALSE;
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}
|
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|
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ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);
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if (ParentBlockDev->BlockSize > PEI_FAT_MAX_BLOCK_SIZE) {
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DEBUG((DEBUG_ERROR, "Device BlockSize %x exceeds FAT_MAX_BLOCK_SIZE\n", ParentBlockDev->BlockSize));
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return FALSE;
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}
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Found = FALSE;
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Mbr = (MASTER_BOOT_RECORD *) PrivateData->BlockData;
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Status = FatReadBlock (
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PrivateData,
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ParentBlockDevNo,
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0,
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ParentBlockDev->BlockSize,
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Mbr
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);
|
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if (EFI_ERROR (Status) || !PartitionValidMbr (Mbr, ParentBlockDev->LastBlock)) {
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goto Done;
|
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}
|
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//
|
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// We have a valid mbr - add each partition
|
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//
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for (Index = 0; Index < MAX_MBR_PARTITIONS; Index++) {
|
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if (Mbr->Partition[Index].OSIndicator == 0x00 || UNPACK_INT32 (Mbr->Partition[Index].SizeInLBA) == 0) {
|
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//
|
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// Don't use null MBR entries
|
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//
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continue;
|
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}
|
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//
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// Register this partition
|
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//
|
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if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {
|
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|
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Found = TRUE;
|
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|
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BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);
|
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|
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BlockDev->BlockSize = MBR_SIZE;
|
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BlockDev->LastBlock = UNPACK_INT32 (Mbr->Partition[Index].SizeInLBA) - 1;
|
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BlockDev->IoAlign = ParentBlockDev->IoAlign;
|
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BlockDev->Logical = TRUE;
|
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BlockDev->PartitionChecked = FALSE;
|
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BlockDev->StartingPos = MultU64x32 (
|
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UNPACK_INT32 (Mbr->Partition[Index].StartingLBA),
|
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ParentBlockDev->BlockSize
|
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);
|
||||
BlockDev->ParentDevNo = ParentBlockDevNo;
|
||||
|
||||
PrivateData->BlockDeviceCount++;
|
||||
}
|
||||
}
|
||||
|
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Done:
|
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|
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ParentBlockDev->PartitionChecked = TRUE;
|
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return Found;
|
||||
}
|
||||
@ -2,7 +2,7 @@
|
||||
Routines supporting partition discovery and
|
||||
logical device reading
|
||||
|
||||
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
|
||||
Copyright (c) 2006 - 2019, 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
|
||||
@ -14,20 +14,18 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
||||
|
||||
**/
|
||||
|
||||
#include <IndustryStandard/Mbr.h>
|
||||
#include <IndustryStandard/ElTorito.h>
|
||||
#include "FatLitePeim.h"
|
||||
|
||||
/**
|
||||
This function finds Eltorito partitions. Main algorithm
|
||||
is ported from DXE partition driver.
|
||||
|
||||
@param PrivateData The global memory map
|
||||
@param ParentBlockDevNo The parent block device
|
||||
@param[in] PrivateData The global memory map
|
||||
@param[in] ParentBlockDevNo The parent block device
|
||||
|
||||
@retval TRUE New partitions are detected and logical block devices
|
||||
are added to block device array
|
||||
@retval FALSE No New partitions are added;
|
||||
are added to block device array
|
||||
@retval FALSE No new partitions are added
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
@ -40,12 +38,12 @@ FatFindEltoritoPartitions (
|
||||
This function finds Mbr partitions. Main algorithm
|
||||
is ported from DXE partition driver.
|
||||
|
||||
@param PrivateData The global memory map
|
||||
@param ParentBlockDevNo The parent block device
|
||||
@param[in] PrivateData The global memory map
|
||||
@param[in] ParentBlockDevNo The parent block device
|
||||
|
||||
@retval TRUE New partitions are detected and logical block devices
|
||||
are added to block device array
|
||||
@retval FALSE No New partitions are added;
|
||||
are added to block device array
|
||||
@retval FALSE No new partitions are added
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
@ -54,7 +52,6 @@ FatFindMbrPartitions (
|
||||
IN UINTN ParentBlockDevNo
|
||||
);
|
||||
|
||||
|
||||
/**
|
||||
This function finds partitions (logical devices) in physical block devices.
|
||||
|
||||
@ -83,384 +80,3 @@ FatFindPartitions (
|
||||
} while (Found && PrivateData->BlockDeviceCount <= PEI_FAT_MAX_BLOCK_DEVICE);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
This function finds Eltorito partitions. Main algorithm
|
||||
is ported from DXE partition driver.
|
||||
|
||||
@param PrivateData The global memory map
|
||||
@param ParentBlockDevNo The parent block device
|
||||
|
||||
@retval TRUE New partitions are detected and logical block devices
|
||||
are added to block device array
|
||||
@retval FALSE No New partitions are added;
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
FatFindEltoritoPartitions (
|
||||
IN PEI_FAT_PRIVATE_DATA *PrivateData,
|
||||
IN UINTN ParentBlockDevNo
|
||||
)
|
||||
{
|
||||
EFI_STATUS Status;
|
||||
BOOLEAN Found;
|
||||
PEI_FAT_BLOCK_DEVICE *BlockDev;
|
||||
PEI_FAT_BLOCK_DEVICE *ParentBlockDev;
|
||||
UINT32 VolDescriptorLba;
|
||||
UINT32 Lba;
|
||||
CDROM_VOLUME_DESCRIPTOR *VolDescriptor;
|
||||
ELTORITO_CATALOG *Catalog;
|
||||
UINTN Check;
|
||||
UINTN Index;
|
||||
UINTN MaxIndex;
|
||||
UINT16 *CheckBuffer;
|
||||
UINT32 SubBlockSize;
|
||||
UINT32 SectorCount;
|
||||
UINT32 VolSpaceSize;
|
||||
|
||||
if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
Found = FALSE;
|
||||
ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);
|
||||
VolSpaceSize = 0;
|
||||
|
||||
//
|
||||
// CD_ROM has the fixed block size as 2048 bytes
|
||||
//
|
||||
if (ParentBlockDev->BlockSize != 2048) {
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
VolDescriptor = (CDROM_VOLUME_DESCRIPTOR *) PrivateData->BlockData;
|
||||
Catalog = (ELTORITO_CATALOG *) VolDescriptor;
|
||||
|
||||
//
|
||||
// the ISO-9660 volume descriptor starts at 32k on the media
|
||||
// and CD_ROM has the fixed block size as 2048 bytes, so...
|
||||
//
|
||||
VolDescriptorLba = 15;
|
||||
//
|
||||
// ((16*2048) / Media->BlockSize) - 1;
|
||||
//
|
||||
// Loop: handle one volume descriptor per time
|
||||
//
|
||||
while (TRUE) {
|
||||
|
||||
VolDescriptorLba += 1;
|
||||
if (VolDescriptorLba > ParentBlockDev->LastBlock) {
|
||||
//
|
||||
// We are pointing past the end of the device so exit
|
||||
//
|
||||
break;
|
||||
}
|
||||
|
||||
Status = FatReadBlock (
|
||||
PrivateData,
|
||||
ParentBlockDevNo,
|
||||
VolDescriptorLba,
|
||||
ParentBlockDev->BlockSize,
|
||||
VolDescriptor
|
||||
);
|
||||
if (EFI_ERROR (Status)) {
|
||||
break;
|
||||
}
|
||||
//
|
||||
// Check for valid volume descriptor signature
|
||||
//
|
||||
if (VolDescriptor->Unknown.Type == CDVOL_TYPE_END ||
|
||||
CompareMem (VolDescriptor->Unknown.Id, CDVOL_ID, sizeof (VolDescriptor->Unknown.Id)) != 0
|
||||
) {
|
||||
//
|
||||
// end of Volume descriptor list
|
||||
//
|
||||
break;
|
||||
}
|
||||
//
|
||||
// Read the Volume Space Size from Primary Volume Descriptor 81-88 byte
|
||||
//
|
||||
if (VolDescriptor->Unknown.Type == CDVOL_TYPE_CODED) {
|
||||
VolSpaceSize = VolDescriptor->PrimaryVolume.VolSpaceSize[1];
|
||||
}
|
||||
//
|
||||
// Is it an El Torito volume descriptor?
|
||||
//
|
||||
if (CompareMem (
|
||||
VolDescriptor->BootRecordVolume.SystemId,
|
||||
CDVOL_ELTORITO_ID,
|
||||
sizeof (CDVOL_ELTORITO_ID) - 1
|
||||
) != 0) {
|
||||
continue;
|
||||
}
|
||||
//
|
||||
// Read in the boot El Torito boot catalog
|
||||
//
|
||||
Lba = UNPACK_INT32 (VolDescriptor->BootRecordVolume.EltCatalog);
|
||||
if (Lba > ParentBlockDev->LastBlock) {
|
||||
continue;
|
||||
}
|
||||
|
||||
Status = FatReadBlock (
|
||||
PrivateData,
|
||||
ParentBlockDevNo,
|
||||
Lba,
|
||||
ParentBlockDev->BlockSize,
|
||||
Catalog
|
||||
);
|
||||
if (EFI_ERROR (Status)) {
|
||||
continue;
|
||||
}
|
||||
//
|
||||
// We don't care too much about the Catalog header's contents, but we do want
|
||||
// to make sure it looks like a Catalog header
|
||||
//
|
||||
if (Catalog->Catalog.Indicator != ELTORITO_ID_CATALOG || Catalog->Catalog.Id55AA != 0xAA55) {
|
||||
continue;
|
||||
}
|
||||
|
||||
Check = 0;
|
||||
CheckBuffer = (UINT16 *) Catalog;
|
||||
for (Index = 0; Index < sizeof (ELTORITO_CATALOG) / sizeof (UINT16); Index += 1) {
|
||||
Check += CheckBuffer[Index];
|
||||
}
|
||||
|
||||
if ((Check & 0xFFFF) != 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
MaxIndex = ParentBlockDev->BlockSize / sizeof (ELTORITO_CATALOG);
|
||||
for (Index = 1; Index < MaxIndex; Index += 1) {
|
||||
//
|
||||
// Next entry
|
||||
//
|
||||
Catalog += 1;
|
||||
|
||||
//
|
||||
// Check this entry
|
||||
//
|
||||
if (Catalog->Boot.Indicator != ELTORITO_ID_SECTION_BOOTABLE || Catalog->Boot.Lba == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
SubBlockSize = 512;
|
||||
SectorCount = Catalog->Boot.SectorCount;
|
||||
|
||||
switch (Catalog->Boot.MediaType) {
|
||||
|
||||
case ELTORITO_NO_EMULATION:
|
||||
SubBlockSize = ParentBlockDev->BlockSize;
|
||||
SectorCount = Catalog->Boot.SectorCount;
|
||||
break;
|
||||
|
||||
case ELTORITO_HARD_DISK:
|
||||
break;
|
||||
|
||||
case ELTORITO_12_DISKETTE:
|
||||
SectorCount = 0x50 * 0x02 * 0x0F;
|
||||
break;
|
||||
|
||||
case ELTORITO_14_DISKETTE:
|
||||
SectorCount = 0x50 * 0x02 * 0x12;
|
||||
break;
|
||||
|
||||
case ELTORITO_28_DISKETTE:
|
||||
SectorCount = 0x50 * 0x02 * 0x24;
|
||||
break;
|
||||
|
||||
default:
|
||||
SectorCount = 0;
|
||||
SubBlockSize = ParentBlockDev->BlockSize;
|
||||
break;
|
||||
}
|
||||
|
||||
if (SectorCount < 2) {
|
||||
SectorCount = (VolSpaceSize > ParentBlockDev->LastBlock + 1) ? (UINT32) (ParentBlockDev->LastBlock - Catalog->Boot.Lba + 1) : (UINT32) (VolSpaceSize - Catalog->Boot.Lba);
|
||||
}
|
||||
//
|
||||
// Register this partition
|
||||
//
|
||||
if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {
|
||||
|
||||
Found = TRUE;
|
||||
|
||||
BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);
|
||||
|
||||
BlockDev->BlockSize = SubBlockSize;
|
||||
BlockDev->LastBlock = SectorCount - 1;
|
||||
BlockDev->IoAlign = ParentBlockDev->IoAlign;
|
||||
BlockDev->Logical = TRUE;
|
||||
BlockDev->PartitionChecked = FALSE;
|
||||
BlockDev->StartingPos = MultU64x32 (Catalog->Boot.Lba, ParentBlockDev->BlockSize);
|
||||
BlockDev->ParentDevNo = ParentBlockDevNo;
|
||||
|
||||
PrivateData->BlockDeviceCount++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
ParentBlockDev->PartitionChecked = TRUE;
|
||||
|
||||
return Found;
|
||||
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Test to see if the Mbr buffer is a valid MBR
|
||||
|
||||
@param Mbr Parent Handle
|
||||
@param LastLba Last Lba address on the device.
|
||||
|
||||
@retval TRUE Mbr is a Valid MBR
|
||||
@retval FALSE Mbr is not a Valid MBR
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
PartitionValidMbr (
|
||||
IN MASTER_BOOT_RECORD *Mbr,
|
||||
IN EFI_PEI_LBA LastLba
|
||||
)
|
||||
{
|
||||
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) {
|
||||
//
|
||||
// Compatability Errata:
|
||||
// Some systems try to hide drive space with thier 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 Because 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_INT32 (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;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
This function finds Mbr partitions. Main algorithm
|
||||
is ported from DXE partition driver.
|
||||
|
||||
@param PrivateData The global memory map
|
||||
@param ParentBlockDevNo The parent block device
|
||||
|
||||
@retval TRUE New partitions are detected and logical block devices
|
||||
are added to block device array
|
||||
@retval FALSE No New partitions are added;
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
FatFindMbrPartitions (
|
||||
IN PEI_FAT_PRIVATE_DATA *PrivateData,
|
||||
IN UINTN ParentBlockDevNo
|
||||
)
|
||||
{
|
||||
EFI_STATUS Status;
|
||||
MASTER_BOOT_RECORD *Mbr;
|
||||
UINTN Index;
|
||||
BOOLEAN Found;
|
||||
PEI_FAT_BLOCK_DEVICE *ParentBlockDev;
|
||||
PEI_FAT_BLOCK_DEVICE *BlockDev;
|
||||
|
||||
if (ParentBlockDevNo > PEI_FAT_MAX_BLOCK_DEVICE - 1) {
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
ParentBlockDev = &(PrivateData->BlockDevice[ParentBlockDevNo]);
|
||||
|
||||
Found = FALSE;
|
||||
Mbr = (MASTER_BOOT_RECORD *) PrivateData->BlockData;
|
||||
|
||||
Status = FatReadBlock (
|
||||
PrivateData,
|
||||
ParentBlockDevNo,
|
||||
0,
|
||||
ParentBlockDev->BlockSize,
|
||||
Mbr
|
||||
);
|
||||
|
||||
if (EFI_ERROR (Status) || !PartitionValidMbr (Mbr, ParentBlockDev->LastBlock)) {
|
||||
goto Done;
|
||||
}
|
||||
//
|
||||
// We have a valid mbr - add each partition
|
||||
//
|
||||
for (Index = 0; Index < MAX_MBR_PARTITIONS; Index++) {
|
||||
if (Mbr->Partition[Index].OSIndicator == 0x00 || UNPACK_INT32 (Mbr->Partition[Index].SizeInLBA) == 0) {
|
||||
//
|
||||
// Don't use null MBR entries
|
||||
//
|
||||
continue;
|
||||
}
|
||||
//
|
||||
// Register this partition
|
||||
//
|
||||
if (PrivateData->BlockDeviceCount < PEI_FAT_MAX_BLOCK_DEVICE) {
|
||||
|
||||
Found = TRUE;
|
||||
|
||||
BlockDev = &(PrivateData->BlockDevice[PrivateData->BlockDeviceCount]);
|
||||
|
||||
BlockDev->BlockSize = MBR_SIZE;
|
||||
BlockDev->LastBlock = UNPACK_INT32 (Mbr->Partition[Index].SizeInLBA) - 1;
|
||||
BlockDev->IoAlign = ParentBlockDev->IoAlign;
|
||||
BlockDev->Logical = TRUE;
|
||||
BlockDev->PartitionChecked = FALSE;
|
||||
BlockDev->StartingPos = MultU64x32 (
|
||||
UNPACK_INT32 (Mbr->Partition[Index].StartingLBA),
|
||||
ParentBlockDev->BlockSize
|
||||
);
|
||||
BlockDev->ParentDevNo = ParentBlockDevNo;
|
||||
|
||||
PrivateData->BlockDeviceCount++;
|
||||
}
|
||||
}
|
||||
|
||||
Done:
|
||||
|
||||
ParentBlockDev->PartitionChecked = TRUE;
|
||||
return Found;
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user