mirror of https://github.com/acidanthera/audk.git
276 lines
8.1 KiB
C
276 lines
8.1 KiB
C
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/** @file
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Decode an El Torito formatted CD-ROM
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Copyright (c) 2006 - 2007, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this 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 "Partition.h"
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/**
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Install child handles if the Handle supports El Torito format.
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@param[in] This Calling context.
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@param[in] Handle Parent Handle
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@param[in] DiskIo Parent DiskIo interface
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@param[in] BlockIo Parent BlockIo interface
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@param[in] DevicePath Parent Device Path
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@retval EFI_SUCCESS Child handle(s) was added
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@retval EFI_MEDIA_CHANGED Media changed Detected
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@retval other no child handle was added
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**/
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EFI_STATUS
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PartitionInstallElToritoChildHandles (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE Handle,
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IN EFI_DISK_IO_PROTOCOL *DiskIo,
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IN EFI_BLOCK_IO_PROTOCOL *BlockIo,
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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EFI_STATUS Status;
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UINT32 VolDescriptorLba;
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UINT32 Lba;
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EFI_BLOCK_IO_MEDIA *Media;
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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 BootEntry;
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UINTN MaxIndex;
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UINT16 *CheckBuffer;
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CDROM_DEVICE_PATH CdDev;
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UINT32 SubBlockSize;
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UINT32 SectorCount;
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EFI_STATUS Found;
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UINT32 VolSpaceSize;
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Found = EFI_NOT_FOUND;
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Media = BlockIo->Media;
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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 (Media->BlockSize != 2048) {
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return EFI_NOT_FOUND;
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}
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VolDescriptor = AllocatePool ((UINTN) Media->BlockSize);
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if (VolDescriptor == NULL) {
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return EFI_NOT_FOUND;
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}
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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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//
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// ((16*2048) / Media->BlockSize) - 1;
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//
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VolDescriptorLba = 15;
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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 > Media->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 = BlockIo->ReadBlocks (
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BlockIo,
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Media->MediaId,
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VolDescriptorLba,
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Media->BlockSize,
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VolDescriptor
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);
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if (EFI_ERROR (Status)) {
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Found = 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->Type == CDVOL_TYPE_END ||
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CompareMem (VolDescriptor->Id, CDVOL_ID, sizeof (VolDescriptor->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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// the 32-bit numerical values is stored in Both-byte orders
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//
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if (VolDescriptor->Type == CDVOL_TYPE_CODED) {
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VolSpaceSize = VolDescriptor->VolSpaceSize[0];
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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 (VolDescriptor->SystemId, CDVOL_ELTORITO_ID, sizeof (CDVOL_ELTORITO_ID) - 1) != 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->EltCatalog);
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if (Lba > Media->LastBlock) {
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continue;
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}
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Status = BlockIo->ReadBlocks (
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BlockIo,
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Media->MediaId,
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Lba,
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Media->BlockSize,
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Catalog
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_ERROR, "EltCheckDevice: error reading catalog %r\n", 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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DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header IDs not correct\n"));
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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) {
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DEBUG ((EFI_D_ERROR, "EltCheckBootCatalog: El Torito boot catalog header checksum failed\n"));
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continue;
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}
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MaxIndex = Media->BlockSize / sizeof (ELTORITO_CATALOG);
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for (Index = 1, BootEntry = 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 = Media->BlockSize;
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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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DEBUG ((EFI_D_INIT, "EltCheckDevice: unsupported El Torito boot media type %x\n", Catalog->Boot.MediaType));
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SectorCount = 0;
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SubBlockSize = Media->BlockSize;
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break;
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}
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//
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// Create child device handle
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//
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CdDev.Header.Type = MEDIA_DEVICE_PATH;
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CdDev.Header.SubType = MEDIA_CDROM_DP;
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SetDevicePathNodeLength (&CdDev.Header, sizeof (CdDev));
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if (Index == 1) {
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//
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// This is the initial/default entry
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//
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BootEntry = 0;
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}
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CdDev.BootEntry = (UINT32) BootEntry;
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BootEntry++;
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CdDev.PartitionStart = Catalog->Boot.Lba;
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if (SectorCount < 2) {
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//
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// When the SectorCount < 2, set the Partition as the whole CD.
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//
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if (VolSpaceSize > (Media->LastBlock + 1)) {
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CdDev.PartitionSize = (UINT32)(Media->LastBlock - Catalog->Boot.Lba + 1);
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} else {
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CdDev.PartitionSize = (UINT32)(VolSpaceSize - Catalog->Boot.Lba);
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}
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} else {
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CdDev.PartitionSize = DivU64x32 (
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MultU64x32 (
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SectorCount,
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SubBlockSize
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) + Media->BlockSize - 1,
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Media->BlockSize
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);
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}
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Status = PartitionInstallChildHandle (
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This,
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Handle,
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DiskIo,
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BlockIo,
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DevicePath,
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(EFI_DEVICE_PATH_PROTOCOL *) &CdDev,
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Catalog->Boot.Lba,
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Catalog->Boot.Lba + CdDev.PartitionSize - 1,
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SubBlockSize,
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FALSE
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);
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if (!EFI_ERROR (Status)) {
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Found = EFI_SUCCESS;
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}
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}
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}
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FreePool (VolDescriptor);
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return Found;
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}
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