mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 03:23:47 +00:00
8bde7f776c
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Stäubli Faverges - <www.staubli.com>
|
|
* Pierre AUBERT p.aubert@staubli.com
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <config.h>
|
|
#include <malloc.h>
|
|
|
|
#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
|
|
|
|
#include "dos.h"
|
|
#include "fdos.h"
|
|
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* fat_decode --
|
|
*-----------------------------------------------------------------------------
|
|
*/
|
|
unsigned int fat_decode (Fs_t *fs, unsigned int num)
|
|
{
|
|
unsigned int start = num * 3 / 2;
|
|
unsigned char *address = fs -> fat_buf + start;
|
|
|
|
if (num < 2 || start + 1 > (fs -> fat_len * SZ_STD_SECTOR))
|
|
return 1;
|
|
|
|
if (num & 1)
|
|
return ((address [1] & 0xff) << 4) | ((address [0] & 0xf0 ) >> 4);
|
|
else
|
|
return ((address [1] & 0xf) << 8) | (address [0] & 0xff );
|
|
}
|
|
/*-----------------------------------------------------------------------------
|
|
* check_fat --
|
|
*-----------------------------------------------------------------------------
|
|
*/
|
|
static int check_fat (Fs_t *fs)
|
|
{
|
|
int i, f;
|
|
|
|
/* Cluster verification */
|
|
for (i = 3 ; i < fs -> num_clus; i++){
|
|
f = fat_decode (fs, i);
|
|
if (f < FAT12_LAST && f > fs -> num_clus){
|
|
/* Wrong cluster number detected */
|
|
return (-1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
/*-----------------------------------------------------------------------------
|
|
* read_one_fat --
|
|
*-----------------------------------------------------------------------------
|
|
*/
|
|
static int read_one_fat (BootSector_t *boot, Fs_t *fs, int nfat)
|
|
{
|
|
if (dev_read (fs -> fat_buf,
|
|
(fs -> fat_start + nfat * fs -> fat_len),
|
|
fs -> fat_len) < 0) {
|
|
return (-1);
|
|
}
|
|
|
|
if (fs -> fat_buf [0] || fs -> fat_buf [1] || fs -> fat_buf [2]) {
|
|
if ((fs -> fat_buf [0] != boot -> descr &&
|
|
(fs -> fat_buf [0] != 0xf9 || boot -> descr != MEDIA_STD)) ||
|
|
fs -> fat_buf [0] < MEDIA_STD){
|
|
/* Unknown Media */
|
|
return (-1);
|
|
}
|
|
if (fs -> fat_buf [1] != 0xff || fs -> fat_buf [2] != 0xff){
|
|
/* FAT doesn't start with good values */
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
if (fs -> num_clus >= FAT12_MAX_NB) {
|
|
/* Too much clusters */
|
|
return (-1);
|
|
}
|
|
|
|
return check_fat (fs);
|
|
}
|
|
/*-----------------------------------------------------------------------------
|
|
* read_fat --
|
|
*-----------------------------------------------------------------------------
|
|
*/
|
|
int read_fat (BootSector_t *boot, Fs_t *fs)
|
|
{
|
|
unsigned int buflen;
|
|
int i;
|
|
|
|
/* Allocate Fat Buffer */
|
|
buflen = fs -> fat_len * SZ_STD_SECTOR;
|
|
if (fs -> fat_buf) {
|
|
free (fs -> fat_buf);
|
|
}
|
|
|
|
if ((fs -> fat_buf = malloc (buflen)) == NULL) {
|
|
return (-1);
|
|
}
|
|
|
|
/* Try to read each Fat */
|
|
for (i = 0; i< fs -> nb_fat; i++){
|
|
if (read_one_fat (boot, fs, i) == 0) {
|
|
/* Fat is OK */
|
|
fs -> num_fat = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == fs -> nb_fat){
|
|
return (-1);
|
|
}
|
|
|
|
if (fs -> fat_len > (((fs -> num_clus + 2) *
|
|
(FAT_BITS / 4) -1 ) / 2 /
|
|
SZ_STD_SECTOR + 1)) {
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#endif
|