/*
- * $Id: redboot.c,v 1.11 2003/05/21 10:39:26 dwmw2 Exp $
+ * $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
- unsigned long flash_base; // Address within FLASH of image
- unsigned long mem_base; // Address in memory where it executes
- unsigned long size; // Length of image
- unsigned long entry_point; // Execution entry point
- unsigned long data_length; // Length of actual data
- unsigned char _pad[256-(16+7*sizeof(unsigned long))];
- unsigned long desc_cksum; // Checksum over image descriptor
- unsigned long file_cksum; // Checksum over image data
+ 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_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,
+static int parse_redboot_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long fis_origin)
{
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 = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ buf = vmalloc(master->erasesize);
if (!buf)
return -ENOMEM;
- /* Read the start of the last erase block */
- ret = master->read(master, master->size - master->erasesize,
- PAGE_SIZE, &retlen, (void *)buf);
+ 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 != PAGE_SIZE) {
+ if (retlen != master->erasesize) {
ret = -EIO;
goto out;
}
- /* RedBoot image could appear in any of the first three slots */
- for (i = 0; i < 3; i++) {
- if (!memcmp(buf[i].name, "RedBoot", 8))
+ 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.)
+ */
+
+ /* RedBoot can combine the FIS directory and
+ config partitions into a single eraseblock;
+ we assume wrong-endian if either the swapped
+ 'size' matches the eraseblock size precisely,
+ or if the swapped size actually fits in an
+ eraseblock while the unswapped size doesn't. */
+ if (swab32(buf[i].size) == master->erasesize ||
+ (buf[i].size > master->erasesize
+ && swab32(buf[i].size) < master->erasesize)) {
+ int j;
+ /* Update numslots based on actual FIS directory size */
+ numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
+ for (j = 0; j < numslots; ++j) {
+
+ /* A single 0xff denotes a deleted entry.
+ * Two of them in a row is the end of the table.
+ */
+ if (buf[j].name[0] == 0xff) {
+ if (buf[j].name[1] == 0xff) {
+ break;
+ } else {
+ continue;
+ }
+ }
+
+ /* 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);
+ }
+ } else if (buf[i].size < master->erasesize) {
+ /* Update numslots based on actual FIS directory size */
+ numslots = buf[i].size / sizeof(struct fis_image_desc);
+ }
break;
+ }
}
- if (i == 3) {
+ if (i == numslots) {
/* Didn't find it */
printk(KERN_NOTICE "No RedBoot partition table detected in %s\n",
master->name);
goto out;
}
- for (i = 0; i < PAGE_SIZE / sizeof(struct fis_image_desc); i++) {
+ for (i = 0; i < numslots; i++) {
struct fis_list *new_fl, **prev;
- if (buf[i].name[0] == 0xff)
- break;
+ if (buf[i].name[0] == 0xff) {
+ if (buf[i].name[1] == 0xff) {
+ break;
+ } else {
+ continue;
+ }
+ }
if (!redboot_checksum(&buf[i]))
break;
nrparts++;
}
- if (fl->img->flash_base)
+#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)
+ if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) {
nrparts++;
+ nulllen = sizeof(nullstring);
+ }
}
- parts = kmalloc(sizeof(*parts)*nrparts + sizeof(nullstring) + namelen, GFP_KERNEL);
+#endif
+ parts = kzalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL);
if (!parts) {
ret = -ENOMEM;
goto out;
}
- memset(parts, 0, sizeof(*parts)*nrparts + namelen);
-
- /* FIXME: Include nullname only if it's used */
nullname = (char *)&parts[nrparts];
- sprintf(nullname, nullstring);
- names = nullname + sizeof(nullstring);
+#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;
- if(fl->next && fl->img->flash_base + fl->img->size + master->erasesize < fl->next->img->flash_base) {
+#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);
fl = fl->next;
kfree(old);
}
- kfree(buf);
+ vfree(buf);
return ret;
}
git://git.onelab.eu / linux-2.6.git / blobdiff