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u-boot/disk/part_iso.c
Stefan Agner 5c27535dc9 disk: part: align buffer so it can be used with DMA enabled drivers 
When using ISO partitions with a DMA enabled block device driver
reading the ISO partition leads to unaligned DMA operations:
  CACHE: Misaligned operation at range [bffb7da8, bffb85a8]

Align the buffer to make sure we pass a buffer which works for
DMA operations.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2017-08-26 14:56:15 -04:00

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/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <asm/unaligned.h>
#include "part_iso.h"
#ifdef HAVE_BLOCK_DEVICE
/* #define ISO_PART_DEBUG */
#ifdef ISO_PART_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
/* enable this if CDs are written with the PowerPC Platform ID */
#undef CHECK_FOR_POWERPC_PLATTFORM
#define CD_SECTSIZE 2048
static unsigned char tmpbuf[CD_SECTSIZE] __aligned(ARCH_DMA_MINALIGN);
unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
lbaint_t blkcnt, void *buffer)
{
unsigned long ret;
if (block_dev->blksz == 512) {
/* Convert from 2048 to 512 sector size */
start *= 4;
blkcnt *= 4;
}
ret = blk_dread(block_dev, start, blkcnt, buffer);
if (block_dev->blksz == 512)
ret /= 4;
return ret;
}
/* only boot records will be listed as valid partitions */
int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
disk_partition_t *info, int verb)
{
int i,offset,entry_num;
unsigned short *chksumbuf;
unsigned short chksum;
unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
iso_boot_rec_t *pbr = (iso_boot_rec_t *)tmpbuf; /* boot record */
iso_pri_rec_t *ppr = (iso_pri_rec_t *)tmpbuf; /* primary desc */
iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
iso_init_def_entry_t *pide;
if ((dev_desc->blksz != CD_SECTSIZE) && (dev_desc->blksz != 512))
return -1;
/* the first sector (sector 0x10) must be a primary volume desc */
blkaddr=PVD_OFFSET;
if (iso_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
return -1;
if(ppr->desctype!=0x01) {
if(verb)
printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
dev_desc->devnum, part_num);
return (-1);
}
if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
if(verb)
printf ("** Wrong ISO Ident: %s on %d:%d **\n",
ppr->stand_ident, dev_desc->devnum, part_num);
return (-1);
}
lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
/* assuming same block size for all entries */
info->blksz = be16_to_cpu(ppr->secsize_BE);
PRINTF(" Lastsect:%08lx\n",lastsect);
for(i=blkaddr;i<lastsect;i++) {
PRINTF("Reading block %d\n", i);
if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
return -1;
if(ppr->desctype==0x00)
break; /* boot entry found */
if(ppr->desctype==0xff) {
if(verb)
printf ("** No valid boot catalog found on %d:%d **\n",
dev_desc->devnum, part_num);
return (-1);
}
}
/* boot entry found */
if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
if(verb)
printf ("** Wrong El Torito ident: %s on %d:%d **\n",
pbr->ident_str, dev_desc->devnum, part_num);
return (-1);
}
bootaddr = get_unaligned_le32(pbr->pointer);
PRINTF(" Boot Entry at: %08lX\n",bootaddr);
if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
if(verb)
printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
bootaddr, dev_desc->devnum, part_num);
return (-1);
}
chksum=0;
chksumbuf = (unsigned short *)tmpbuf;
for(i=0;i<0x10;i++)
chksum += le16_to_cpu(chksumbuf[i]);
if(chksum!=0) {
if(verb)
printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
dev_desc->devnum, part_num);
return (-1);
}
if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
if(verb)
printf ("** Key 0x55 0xAA error on %d:%d **\n",
dev_desc->devnum, part_num);
return(-1);
}
#ifdef CHECK_FOR_POWERPC_PLATTFORM
if(pve->platform!=0x01) {
if(verb)
printf ("** No PowerPC platform CD on %d:%d **\n",
dev_desc->devnum, part_num);
return(-1);
}
#endif
/* the validation entry seems to be ok, now search the "partition" */
entry_num=1;
offset=0x20;
strcpy((char *)info->type, "U-Boot");
part_set_generic_name(dev_desc, part_num, (char *)info->name);
/* the bootcatalog (including validation Entry) is limited to 2048Bytes
* (63 boot entries + validation entry) */
while(offset<2048) {
pide=(iso_init_def_entry_t *)&tmpbuf[offset];
if ((pide->boot_ind==0x88) ||
(pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
if(entry_num==part_num) { /* part found */
goto found;
}
entry_num++; /* count partitions Entries (boot and non bootables */
offset+=0x20;
continue;
}
if ((pide->boot_ind==0x90) || /* Section Header Entry */
(pide->boot_ind==0x91) || /* Section Header Entry (last) */
(pide->boot_ind==0x44)) { /* Extension Indicator */
offset+=0x20; /* skip unused entries */
}
else {
if(verb)
printf ("** Partition %d not found on device %d **\n",
part_num, dev_desc->devnum);
return(-1);
}
}
/* if we reach this point entire sector has been
* searched w/o succsess */
if(verb)
printf ("** Partition %d not found on device %d **\n",
part_num, dev_desc->devnum);
return(-1);
found:
if(pide->boot_ind!=0x88) {
if(verb)
printf("** Partition %d is not bootable on device %d **\n",
part_num, dev_desc->devnum);
return (-1);
}
switch(pide->boot_media) {
case 0x00: /* no emulation */
info->size = get_unaligned_le16(pide->sec_cnt)>>2;
break;
case 0x01: info->size=2400>>2; break; /* 1.2MByte Floppy */
case 0x02: info->size=2880>>2; break; /* 1.44MByte Floppy */
case 0x03: info->size=5760>>2; break; /* 2.88MByte Floppy */
case 0x04: info->size=2880>>2; break; /* dummy (HD Emulation) */
default: info->size=0; break;
}
newblkaddr = get_unaligned_le32(pide->rel_block_addr);
info->start=newblkaddr;
if (dev_desc->blksz == 512) {
info->size *= 4;
info->start *= 4;
info->blksz = 512;
}
PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
return 0;
}
static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
disk_partition_t *info)
{
return part_get_info_iso_verb(dev_desc, part_num, info, 1);
}
static void part_print_iso(struct blk_desc *dev_desc)
{
disk_partition_t info;
int i;
if (part_get_info_iso_verb(dev_desc, 1, &info, 0) == -1) {
printf("** No boot partition found on device %d **\n",
dev_desc->devnum);
return;
}
printf("Part Start Sect x Size Type\n");
i=1;
do {
printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
i, info.start, info.size, info.blksz, info.type);
i++;
} while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
}
static int part_test_iso(struct blk_desc *dev_desc)
{
disk_partition_t info;
return part_get_info_iso_verb(dev_desc, 1, &info, 1);
}
U_BOOT_PART_TYPE(iso) = {
.name = "ISO",
.part_type = PART_TYPE_ISO,
.max_entries = ISO_ENTRY_NUMBERS,
.get_info = part_get_info_iso,
.print = part_print_iso,
.test = part_test_iso,
};
#endif
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