256 lines
6.4 KiB
C
256 lines
6.4 KiB
C
/*
|
|
* $Id: redboot.c,v 1.21 2006/03/30 18:34:37 bjd Exp $
|
|
*
|
|
* Parse RedBoot-style Flash Image System (FIS) tables and
|
|
* produce a Linux partition array to match.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
struct fis_image_desc {
|
|
unsigned char name[16]; // Null terminated name
|
|
uint32_t flash_base; // Address within FLASH of image
|
|
uint32_t mem_base; // Address in memory where it executes
|
|
uint32_t size; // Length of image
|
|
uint32_t entry_point; // Execution entry point
|
|
uint32_t data_length; // Length of actual data
|
|
unsigned char _pad[256-(16+7*sizeof(uint32_t))];
|
|
uint32_t desc_cksum; // Checksum over image descriptor
|
|
uint32_t file_cksum; // Checksum over image data
|
|
};
|
|
|
|
struct fis_list {
|
|
struct fis_image_desc *img;
|
|
struct fis_list *next;
|
|
};
|
|
|
|
static int directory = CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK;
|
|
module_param(directory, int, 0);
|
|
|
|
static inline int redboot_checksum(struct fis_image_desc *img)
|
|
{
|
|
/* RedBoot doesn't actually write the desc_cksum field yet AFAICT */
|
|
return 1;
|
|
}
|
|
|
|
static int parse_redboot_partitions(struct mtd_info *master,
|
|
struct mtd_partition **pparts,
|
|
unsigned long fis_origin)
|
|
{
|
|
int nrparts = 0;
|
|
struct fis_image_desc *buf;
|
|
struct mtd_partition *parts;
|
|
struct fis_list *fl = NULL, *tmp_fl;
|
|
int ret, i;
|
|
size_t retlen;
|
|
char *names;
|
|
char *nullname;
|
|
int namelen = 0;
|
|
int nulllen = 0;
|
|
int numslots;
|
|
unsigned long offset;
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
|
|
static char nullstring[] = "unallocated";
|
|
#endif
|
|
|
|
buf = vmalloc(master->erasesize);
|
|
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if ( directory < 0 )
|
|
offset = master->size + directory*master->erasesize;
|
|
else
|
|
offset = directory*master->erasesize;
|
|
|
|
printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n",
|
|
master->name, offset);
|
|
|
|
ret = master->read(master, offset,
|
|
master->erasesize, &retlen, (void *)buf);
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (retlen != master->erasesize) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
numslots = (master->erasesize / sizeof(struct fis_image_desc));
|
|
for (i = 0; i < numslots; i++) {
|
|
if (!memcmp(buf[i].name, "FIS directory", 14)) {
|
|
/* This is apparently the FIS directory entry for the
|
|
* FIS directory itself. The FIS directory size is
|
|
* one erase block; if the buf[i].size field is
|
|
* swab32(erasesize) then we know we are looking at
|
|
* a byte swapped FIS directory - swap all the entries!
|
|
* (NOTE: this is 'size' not 'data_length'; size is
|
|
* the full size of the entry.)
|
|
*/
|
|
if (swab32(buf[i].size) == master->erasesize) {
|
|
int j;
|
|
for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
|
|
/* The unsigned long fields were written with the
|
|
* wrong byte sex, name and pad have no byte sex.
|
|
*/
|
|
swab32s(&buf[j].flash_base);
|
|
swab32s(&buf[j].mem_base);
|
|
swab32s(&buf[j].size);
|
|
swab32s(&buf[j].entry_point);
|
|
swab32s(&buf[j].data_length);
|
|
swab32s(&buf[j].desc_cksum);
|
|
swab32s(&buf[j].file_cksum);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (i == numslots) {
|
|
/* Didn't find it */
|
|
printk(KERN_NOTICE "No RedBoot partition table detected in %s\n",
|
|
master->name);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < numslots; i++) {
|
|
struct fis_list *new_fl, **prev;
|
|
|
|
if (buf[i].name[0] == 0xff)
|
|
continue;
|
|
if (!redboot_checksum(&buf[i]))
|
|
break;
|
|
|
|
new_fl = kmalloc(sizeof(struct fis_list), GFP_KERNEL);
|
|
namelen += strlen(buf[i].name)+1;
|
|
if (!new_fl) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
new_fl->img = &buf[i];
|
|
if (fis_origin) {
|
|
buf[i].flash_base -= fis_origin;
|
|
} else {
|
|
buf[i].flash_base &= master->size-1;
|
|
}
|
|
|
|
/* I'm sure the JFFS2 code has done me permanent damage.
|
|
* I now think the following is _normal_
|
|
*/
|
|
prev = &fl;
|
|
while(*prev && (*prev)->img->flash_base < new_fl->img->flash_base)
|
|
prev = &(*prev)->next;
|
|
new_fl->next = *prev;
|
|
*prev = new_fl;
|
|
|
|
nrparts++;
|
|
}
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
|
|
if (fl->img->flash_base) {
|
|
nrparts++;
|
|
nulllen = sizeof(nullstring);
|
|
}
|
|
|
|
for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) {
|
|
if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) {
|
|
nrparts++;
|
|
nulllen = sizeof(nullstring);
|
|
}
|
|
}
|
|
#endif
|
|
parts = kmalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL);
|
|
|
|
if (!parts) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
memset(parts, 0, sizeof(*parts)*nrparts + nulllen + namelen);
|
|
|
|
nullname = (char *)&parts[nrparts];
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
|
|
if (nulllen > 0) {
|
|
strcpy(nullname, nullstring);
|
|
}
|
|
#endif
|
|
names = nullname + nulllen;
|
|
|
|
i=0;
|
|
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
|
|
if (fl->img->flash_base) {
|
|
parts[0].name = nullname;
|
|
parts[0].size = fl->img->flash_base;
|
|
parts[0].offset = 0;
|
|
i++;
|
|
}
|
|
#endif
|
|
for ( ; i<nrparts; i++) {
|
|
parts[i].size = fl->img->size;
|
|
parts[i].offset = fl->img->flash_base;
|
|
parts[i].name = names;
|
|
|
|
strcpy(names, fl->img->name);
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_READONLY
|
|
if (!memcmp(names, "RedBoot", 8) ||
|
|
!memcmp(names, "RedBoot config", 15) ||
|
|
!memcmp(names, "FIS directory", 14)) {
|
|
parts[i].mask_flags = MTD_WRITEABLE;
|
|
}
|
|
#endif
|
|
names += strlen(names)+1;
|
|
|
|
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
|
|
if(fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_base) {
|
|
i++;
|
|
parts[i].offset = parts[i-1].size + parts[i-1].offset;
|
|
parts[i].size = fl->next->img->flash_base - parts[i].offset;
|
|
parts[i].name = nullname;
|
|
}
|
|
#endif
|
|
tmp_fl = fl;
|
|
fl = fl->next;
|
|
kfree(tmp_fl);
|
|
}
|
|
ret = nrparts;
|
|
*pparts = parts;
|
|
out:
|
|
while (fl) {
|
|
struct fis_list *old = fl;
|
|
fl = fl->next;
|
|
kfree(old);
|
|
}
|
|
vfree(buf);
|
|
return ret;
|
|
}
|
|
|
|
static struct mtd_part_parser redboot_parser = {
|
|
.owner = THIS_MODULE,
|
|
.parse_fn = parse_redboot_partitions,
|
|
.name = "RedBoot",
|
|
};
|
|
|
|
static int __init redboot_parser_init(void)
|
|
{
|
|
return register_mtd_parser(&redboot_parser);
|
|
}
|
|
|
|
static void __exit redboot_parser_exit(void)
|
|
{
|
|
deregister_mtd_parser(&redboot_parser);
|
|
}
|
|
|
|
module_init(redboot_parser_init);
|
|
module_exit(redboot_parser_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>");
|
|
MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables");
|