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stroese2b918712004-12-16 17:26:24 +00001/*
2 * (C) Copyright 2004
3 * esd gmbh <www.esd-electronics.com>
4 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
5 *
6 * based on code of fs/reiserfs/dev.c by
7 *
8 * (C) Copyright 2003 - 2004
9 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26
27#include <common.h>
stroese2b918712004-12-16 17:26:24 +000028#include <config.h>
29#include <ext2fs.h>
30
31static block_dev_desc_t *ext2fs_block_dev_desc;
32static disk_partition_t part_info;
33
Anton Staaf9bac35f2011-06-13 11:40:39 +000034int ext2fs_set_blk_dev(block_dev_desc_t *rbdd, int part)
wdenkefe2a4d2004-12-16 21:44:03 +000035{
36 ext2fs_block_dev_desc = rbdd;
stroese2b918712004-12-16 17:26:24 +000037
wdenkefe2a4d2004-12-16 21:44:03 +000038 if (part == 0) {
39 /* disk doesn't use partition table */
40 part_info.start = 0;
41 part_info.size = rbdd->lba;
42 part_info.blksz = rbdd->blksz;
43 } else {
44 if (get_partition_info
45 (ext2fs_block_dev_desc, part, &part_info)) {
46 return 0;
47 }
stroese2b918712004-12-16 17:26:24 +000048 }
Anton Staaf9bac35f2011-06-13 11:40:39 +000049 return part_info.size;
wdenkefe2a4d2004-12-16 21:44:03 +000050}
stroese2b918712004-12-16 17:26:24 +000051
52
Anton Staaf9bac35f2011-06-13 11:40:39 +000053int ext2fs_devread(int sector, int byte_offset, int byte_len, char *buf)
54{
Anton staaf4c1cd722011-10-03 13:55:00 +000055 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE);
Anton Staafd961c182011-06-13 11:40:40 +000056 unsigned sectors;
wdenkefe2a4d2004-12-16 21:44:03 +000057
Anton Staaf9bac35f2011-06-13 11:40:39 +000058 /*
59 * Check partition boundaries
60 */
61 if ((sector < 0) ||
62 ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
wdenkefe2a4d2004-12-16 21:44:03 +000063 part_info.size)) {
Anton Staaf9bac35f2011-06-13 11:40:39 +000064 /* errnum = ERR_OUTSIDE_PART; */
65 printf(" ** %s read outside partition sector %d\n",
66 __func__,
67 sector);
68 return 0;
stroese2b918712004-12-16 17:26:24 +000069 }
70
Anton Staaf9bac35f2011-06-13 11:40:39 +000071 /*
72 * Get the read to the beginning of a partition.
73 */
wdenkefe2a4d2004-12-16 21:44:03 +000074 sector += byte_offset >> SECTOR_BITS;
75 byte_offset &= SECTOR_SIZE - 1;
stroese2b918712004-12-16 17:26:24 +000076
Anton Staaf9bac35f2011-06-13 11:40:39 +000077 debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
stroese2b918712004-12-16 17:26:24 +000078
wdenkefe2a4d2004-12-16 21:44:03 +000079 if (ext2fs_block_dev_desc == NULL) {
Anton Staaf9bac35f2011-06-13 11:40:39 +000080 printf(" ** %s Invalid Block Device Descriptor (NULL)\n",
81 __func__);
82 return 0;
stroese2b918712004-12-16 17:26:24 +000083 }
84
wdenkefe2a4d2004-12-16 21:44:03 +000085 if (byte_offset != 0) {
86 /* read first part which isn't aligned with start of sector */
87 if (ext2fs_block_dev_desc->
Anton Staaf9bac35f2011-06-13 11:40:39 +000088 block_read(ext2fs_block_dev_desc->dev,
89 part_info.start + sector, 1,
90 (unsigned long *) sec_buf) != 1) {
91 printf(" ** %s read error **\n", __func__);
92 return 0;
wdenkefe2a4d2004-12-16 21:44:03 +000093 }
Anton Staaf9bac35f2011-06-13 11:40:39 +000094 memcpy(buf, sec_buf + byte_offset,
95 min(SECTOR_SIZE - byte_offset, byte_len));
96 buf += min(SECTOR_SIZE - byte_offset, byte_len);
97 byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
wdenkefe2a4d2004-12-16 21:44:03 +000098 sector++;
stroese2b918712004-12-16 17:26:24 +000099 }
100
wdenkefe2a4d2004-12-16 21:44:03 +0000101 /* read sector aligned part */
Anton Staafd961c182011-06-13 11:40:40 +0000102 sectors = byte_len / SECTOR_SIZE;
Dave Liuce1120d2008-02-29 17:45:31 +0800103
Anton Staafd961c182011-06-13 11:40:40 +0000104 if (sectors > 0) {
105 if (ext2fs_block_dev_desc->block_read(
106 ext2fs_block_dev_desc->dev,
107 part_info.start + sector,
108 sectors,
109 (unsigned long *) buf) != sectors) {
110 printf(" ** %s read error - block\n", __func__);
111 return 0;
112 }
Dave Liuce1120d2008-02-29 17:45:31 +0800113
Anton Staafd961c182011-06-13 11:40:40 +0000114 buf += sectors * SECTOR_SIZE;
115 byte_len -= sectors * SECTOR_SIZE;
116 sector += sectors;
Dave Liuce1120d2008-02-29 17:45:31 +0800117 }
118
wdenkefe2a4d2004-12-16 21:44:03 +0000119 if (byte_len != 0) {
120 /* read rest of data which are not in whole sector */
121 if (ext2fs_block_dev_desc->
Anton Staaf9bac35f2011-06-13 11:40:39 +0000122 block_read(ext2fs_block_dev_desc->dev,
123 part_info.start + sector, 1,
124 (unsigned long *) sec_buf) != 1) {
125 printf(" ** %s read error - last part\n", __func__);
126 return 0;
wdenkefe2a4d2004-12-16 21:44:03 +0000127 }
Anton Staaf9bac35f2011-06-13 11:40:39 +0000128 memcpy(buf, sec_buf, byte_len);
stroese2b918712004-12-16 17:26:24 +0000129 }
Anton Staaf9bac35f2011-06-13 11:40:39 +0000130 return 1;
wdenkefe2a4d2004-12-16 21:44:03 +0000131}