316 lines
8.5 KiB
C
316 lines
8.5 KiB
C
/*
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* Parse RedBoot-style Flash Image System (FIS) tables and
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* produce a Linux partition array to match.
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*
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* Copyright © 2001 Red Hat UK Limited
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* Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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struct fis_image_desc {
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unsigned char name[16]; // Null terminated name
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uint32_t flash_base; // Address within FLASH of image
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uint32_t mem_base; // Address in memory where it executes
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uint32_t size; // Length of image
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uint32_t entry_point; // Execution entry point
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uint32_t data_length; // Length of actual data
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unsigned char _pad[256-(16+7*sizeof(uint32_t))];
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uint32_t desc_cksum; // Checksum over image descriptor
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uint32_t file_cksum; // Checksum over image data
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};
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struct fis_list {
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struct fis_image_desc *img;
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struct fis_list *next;
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};
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static int directory = CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK;
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module_param(directory, int, 0);
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static inline int redboot_checksum(struct fis_image_desc *img)
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{
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/* RedBoot doesn't actually write the desc_cksum field yet AFAICT */
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return 1;
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}
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static int parse_redboot_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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unsigned long fis_origin)
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{
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int nrparts = 0;
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struct fis_image_desc *buf;
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struct mtd_partition *parts;
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struct fis_list *fl = NULL, *tmp_fl;
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int ret, i;
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size_t retlen;
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char *names;
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char *nullname;
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int namelen = 0;
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int nulllen = 0;
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int numslots;
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unsigned long offset;
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#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
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static char nullstring[] = "unallocated";
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#endif
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if ( directory < 0 ) {
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offset = master->size + directory * master->erasesize;
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while (master->block_isbad &&
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master->block_isbad(master, offset)) {
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if (!offset) {
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nogood:
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printk(KERN_NOTICE "Failed to find a non-bad block to check for RedBoot partition table\n");
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return -EIO;
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}
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offset -= master->erasesize;
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}
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} else {
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offset = directory * master->erasesize;
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while (master->block_isbad &&
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master->block_isbad(master, offset)) {
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offset += master->erasesize;
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if (offset == master->size)
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goto nogood;
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}
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}
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buf = vmalloc(master->erasesize);
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if (!buf)
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return -ENOMEM;
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printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n",
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master->name, offset);
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ret = master->read(master, offset,
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master->erasesize, &retlen, (void *)buf);
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if (ret)
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goto out;
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if (retlen != master->erasesize) {
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ret = -EIO;
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goto out;
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}
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numslots = (master->erasesize / sizeof(struct fis_image_desc));
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for (i = 0; i < numslots; i++) {
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if (!memcmp(buf[i].name, "FIS directory", 14)) {
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/* This is apparently the FIS directory entry for the
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* FIS directory itself. The FIS directory size is
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* one erase block; if the buf[i].size field is
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* swab32(erasesize) then we know we are looking at
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* a byte swapped FIS directory - swap all the entries!
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* (NOTE: this is 'size' not 'data_length'; size is
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* the full size of the entry.)
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*/
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/* RedBoot can combine the FIS directory and
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config partitions into a single eraseblock;
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we assume wrong-endian if either the swapped
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'size' matches the eraseblock size precisely,
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or if the swapped size actually fits in an
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eraseblock while the unswapped size doesn't. */
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if (swab32(buf[i].size) == master->erasesize ||
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(buf[i].size > master->erasesize
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&& swab32(buf[i].size) < master->erasesize)) {
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int j;
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/* Update numslots based on actual FIS directory size */
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numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
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for (j = 0; j < numslots; ++j) {
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/* A single 0xff denotes a deleted entry.
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* Two of them in a row is the end of the table.
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*/
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if (buf[j].name[0] == 0xff) {
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if (buf[j].name[1] == 0xff) {
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break;
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} else {
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continue;
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}
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}
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/* The unsigned long fields were written with the
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* wrong byte sex, name and pad have no byte sex.
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*/
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swab32s(&buf[j].flash_base);
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swab32s(&buf[j].mem_base);
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swab32s(&buf[j].size);
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swab32s(&buf[j].entry_point);
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swab32s(&buf[j].data_length);
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swab32s(&buf[j].desc_cksum);
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swab32s(&buf[j].file_cksum);
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}
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} else if (buf[i].size < master->erasesize) {
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/* Update numslots based on actual FIS directory size */
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numslots = buf[i].size / sizeof(struct fis_image_desc);
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}
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break;
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}
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}
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if (i == numslots) {
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/* Didn't find it */
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printk(KERN_NOTICE "No RedBoot partition table detected in %s\n",
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master->name);
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ret = 0;
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goto out;
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}
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for (i = 0; i < numslots; i++) {
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struct fis_list *new_fl, **prev;
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if (buf[i].name[0] == 0xff) {
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if (buf[i].name[1] == 0xff) {
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break;
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} else {
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continue;
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}
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}
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if (!redboot_checksum(&buf[i]))
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break;
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new_fl = kmalloc(sizeof(struct fis_list), GFP_KERNEL);
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namelen += strlen(buf[i].name)+1;
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if (!new_fl) {
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ret = -ENOMEM;
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goto out;
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}
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new_fl->img = &buf[i];
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if (fis_origin) {
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buf[i].flash_base -= fis_origin;
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} else {
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buf[i].flash_base &= master->size-1;
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}
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/* I'm sure the JFFS2 code has done me permanent damage.
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* I now think the following is _normal_
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*/
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prev = &fl;
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while(*prev && (*prev)->img->flash_base < new_fl->img->flash_base)
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prev = &(*prev)->next;
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new_fl->next = *prev;
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*prev = new_fl;
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nrparts++;
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}
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#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
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if (fl->img->flash_base) {
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nrparts++;
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nulllen = sizeof(nullstring);
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}
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for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) {
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if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) {
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nrparts++;
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nulllen = sizeof(nullstring);
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}
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}
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#endif
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parts = kzalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL);
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if (!parts) {
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ret = -ENOMEM;
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goto out;
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}
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nullname = (char *)&parts[nrparts];
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#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
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if (nulllen > 0) {
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strcpy(nullname, nullstring);
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}
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#endif
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names = nullname + nulllen;
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i=0;
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#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
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if (fl->img->flash_base) {
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parts[0].name = nullname;
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parts[0].size = fl->img->flash_base;
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parts[0].offset = 0;
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i++;
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}
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#endif
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for ( ; i<nrparts; i++) {
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parts[i].size = fl->img->size;
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parts[i].offset = fl->img->flash_base;
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parts[i].name = names;
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strcpy(names, fl->img->name);
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#ifdef CONFIG_MTD_REDBOOT_PARTS_READONLY
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if (!memcmp(names, "RedBoot", 8) ||
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!memcmp(names, "RedBoot config", 15) ||
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!memcmp(names, "FIS directory", 14)) {
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parts[i].mask_flags = MTD_WRITEABLE;
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}
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#endif
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names += strlen(names)+1;
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#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
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if(fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_base) {
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i++;
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parts[i].offset = parts[i-1].size + parts[i-1].offset;
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parts[i].size = fl->next->img->flash_base - parts[i].offset;
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parts[i].name = nullname;
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}
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#endif
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tmp_fl = fl;
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fl = fl->next;
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kfree(tmp_fl);
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}
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ret = nrparts;
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*pparts = parts;
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out:
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while (fl) {
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struct fis_list *old = fl;
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fl = fl->next;
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kfree(old);
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}
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vfree(buf);
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return ret;
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}
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static struct mtd_part_parser redboot_parser = {
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.owner = THIS_MODULE,
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.parse_fn = parse_redboot_partitions,
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.name = "RedBoot",
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};
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static int __init redboot_parser_init(void)
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{
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return register_mtd_parser(&redboot_parser);
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}
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static void __exit redboot_parser_exit(void)
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{
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deregister_mtd_parser(&redboot_parser);
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}
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module_init(redboot_parser_init);
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module_exit(redboot_parser_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables");
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