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https://github.com/brain-hackers/u-boot-brain
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d961c188b2
Previously reading or writing zero full sectors (reading the end of one sector and the beginning of the next for example) was special cased and involved stack allocating a second sector buffer. This change uses the same code path for this case as well as when there are a non-zero number of full sectors to access. The result is easier to read and reduces the maximum stack used. Signed-off-by: Anton Staaf <robotboy@chromium.org> Cc: Andy Fleming <afleming@freescale.com> Acked-by: Detlev Zundel <dzu@denx.de>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code of fs/reiserfs/dev.c by
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*
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* (C) Copyright 2003 - 2004
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* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include <config.h>
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#include <ext2fs.h>
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static block_dev_desc_t *ext2fs_block_dev_desc;
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static disk_partition_t part_info;
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int ext2fs_set_blk_dev(block_dev_desc_t *rbdd, int part)
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{
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ext2fs_block_dev_desc = rbdd;
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if (part == 0) {
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/* disk doesn't use partition table */
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part_info.start = 0;
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part_info.size = rbdd->lba;
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part_info.blksz = rbdd->blksz;
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} else {
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if (get_partition_info
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(ext2fs_block_dev_desc, part, &part_info)) {
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return 0;
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}
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}
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return part_info.size;
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}
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int ext2fs_devread(int sector, int byte_offset, int byte_len, char *buf)
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{
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char sec_buf[SECTOR_SIZE];
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unsigned sectors;
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/*
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* Check partition boundaries
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*/
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if ((sector < 0) ||
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((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
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part_info.size)) {
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/* errnum = ERR_OUTSIDE_PART; */
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printf(" ** %s read outside partition sector %d\n",
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__func__,
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sector);
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return 0;
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}
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/*
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* Get the read to the beginning of a partition.
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*/
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sector += byte_offset >> SECTOR_BITS;
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byte_offset &= SECTOR_SIZE - 1;
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debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
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if (ext2fs_block_dev_desc == NULL) {
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printf(" ** %s Invalid Block Device Descriptor (NULL)\n",
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__func__);
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return 0;
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}
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if (byte_offset != 0) {
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/* read first part which isn't aligned with start of sector */
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if (ext2fs_block_dev_desc->
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block_read(ext2fs_block_dev_desc->dev,
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part_info.start + sector, 1,
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(unsigned long *) sec_buf) != 1) {
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printf(" ** %s read error **\n", __func__);
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return 0;
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}
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memcpy(buf, sec_buf + byte_offset,
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min(SECTOR_SIZE - byte_offset, byte_len));
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buf += min(SECTOR_SIZE - byte_offset, byte_len);
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byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
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sector++;
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}
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/* read sector aligned part */
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sectors = byte_len / SECTOR_SIZE;
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if (sectors > 0) {
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if (ext2fs_block_dev_desc->block_read(
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ext2fs_block_dev_desc->dev,
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part_info.start + sector,
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sectors,
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(unsigned long *) buf) != sectors) {
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printf(" ** %s read error - block\n", __func__);
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return 0;
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}
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buf += sectors * SECTOR_SIZE;
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byte_len -= sectors * SECTOR_SIZE;
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sector += sectors;
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}
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if (byte_len != 0) {
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/* read rest of data which are not in whole sector */
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if (ext2fs_block_dev_desc->
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block_read(ext2fs_block_dev_desc->dev,
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part_info.start + sector, 1,
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(unsigned long *) sec_buf) != 1) {
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printf(" ** %s read error - last part\n", __func__);
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return 0;
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}
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memcpy(buf, sec_buf, byte_len);
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}
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return 1;
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}
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