+++ /dev/null
-/*
- * $Id$
- *
- * Copyright (C) 2007 OpenWrt.org
- * Copyright (C) Gabor Juhos <juhosg at openwrt.org>
- *
- * 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., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/kmod.h>
-#include <linux/root_dev.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-
-#include <linux/byteorder/generic.h>
-
-#define PFX "trxsplit: "
-
-#define TRX_MAGIC 0x30524448 /* "HDR0" */
-#define TRX_VERSION 1
-#define TRX_MAX_LEN 0x3A0000
-#define TRX_NO_HEADER 1 /* Do not write TRX header */
-#define TRX_GZ_FILES 0x2 /* Contains up to TRX_MAX_OFFSET individual gzip files */
-#define TRX_MAX_OFFSET 3
-#define TRX_MIN_KERNEL_SIZE 256*1024
-
-struct trx_header {
- u32 magic; /* "HDR0" */
- u32 len; /* Length of file including header */
- u32 crc32; /* 32-bit CRC from flag_version to end of file */
- u32 flag_version; /* 0:15 flags, 16:31 version */
- u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
-};
-
-#define BLOCK_LEN_MIN 0x10000
-
-static struct mtd_info *trx_mtd = NULL;
-static unsigned long trx_offset = 0;
-static int trx_nr_parts = 0;
-static struct mtd_partition trx_parts[TRX_MAX_OFFSET];
-static struct trx_header trx_hdr;
-
-static int __init trxsplit_checktrx(struct mtd_info *mtd, unsigned long offset)
-{
- size_t retlen;
- int err;
-
- err = mtd->read(mtd, offset, sizeof(trx_hdr), &retlen, (void *)&trx_hdr);
- if (err) {
- printk(KERN_ALERT PFX "unable to read from '%s'\n", mtd->name);
- goto err_out;
- }
-
- if (retlen != sizeof(trx_hdr)) {
- printk(KERN_ALERT PFX "reading failed on '%s'\n", mtd->name);
- goto err_out;
- }
-
- trx_hdr.magic = le32_to_cpu(trx_hdr.magic);
- trx_hdr.len = le32_to_cpu(trx_hdr.len);
- trx_hdr.crc32 = le32_to_cpu(trx_hdr.crc32);
- trx_hdr.flag_version = le32_to_cpu(trx_hdr.flag_version);
- trx_hdr.offsets[0] = le32_to_cpu(trx_hdr.offsets[0]);
- trx_hdr.offsets[1] = le32_to_cpu(trx_hdr.offsets[1]);
- trx_hdr.offsets[2] = le32_to_cpu(trx_hdr.offsets[2]);
-
- /* sanity checks */
- if (trx_hdr.magic != TRX_MAGIC)
- goto err_out;
-
- if (trx_hdr.len > mtd->size - offset)
- goto err_out;
-
- /* TODO: add crc32 checking too? */
-
- return 0;
-
-err_out:
- return -1;
-}
-
-static int __init trxsplit_create_partitions(void)
-{
- struct mtd_partition *part = trx_parts;
- int ret = 0;
- int i;
-
- if (trx_mtd == NULL)
- goto out;
-
- printk(KERN_INFO PFX "creating TRX partitions in '%s' (%d,%d)\n",
- trx_mtd->name, MTD_BLOCK_MAJOR, trx_mtd->index);
-
- for (i=0; i<TRX_MAX_OFFSET;i++) {
- part = &trx_parts[i];
- if (trx_hdr.offsets[i] == 0)
- continue;
- part->offset = trx_offset + trx_hdr.offsets[i];
- trx_nr_parts++;
- }
-
- for (i=0; i<trx_nr_parts-1; i++) {
- trx_parts[i].size = trx_parts[i+1].offset - trx_parts[i].offset;
- }
- trx_parts[i].size = trx_mtd->size - trx_parts[i].offset;
-
- i=0;
- part = &trx_parts[i];
- if (part->size < TRX_MIN_KERNEL_SIZE) {
- part->name = "loader";
- i++;
- }
-
- part = &trx_parts[i];
- part->name = "kernel";
- i++;
-
- part = &trx_parts[i];
- part->name = "rootfs";
-
- ret = add_mtd_partitions(trx_mtd, trx_parts, trx_nr_parts);
- if (ret) {
- printk(KERN_ALERT PFX "creating TRX partitions failed\n");
- }
-
-out:
- return ret;
-}
-
-static void __init trxsplit_add_mtd(struct mtd_info *mtd)
-{
- unsigned long offset;
- unsigned long blocklen;
- int err;
-
- if (trx_mtd)
- return;
-
- blocklen = mtd->erasesize;
- if (blocklen < BLOCK_LEN_MIN)
- blocklen = BLOCK_LEN_MIN;
-
- printk(KERN_INFO PFX "searching TRX header in '%s'\n", mtd->name);
-
- err = 0;
- for (offset=0; offset < mtd->size; offset+=blocklen) {
- err = trxsplit_checktrx(mtd, offset);
- if (err == 0)
- break;
- }
-
- if (err) {
- printk(KERN_ALERT PFX "no TRX header found\n");
- return;
- }
-
- printk(KERN_INFO PFX "TRX header found at 0x%lX\n", offset);
-
- trx_mtd = mtd;
- trx_offset = offset;
-}
-
-static void __init trxsplit_remove_mtd(struct mtd_info *mtd)
-{
- /* nothing to do */
-}
-
-static struct mtd_notifier trxsplit_notifier __initdata = {
- .add = trxsplit_add_mtd,
- .remove = trxsplit_remove_mtd,
-};
-
-static void __init trxsplit_find_trx(void)
-{
- register_mtd_user(&trxsplit_notifier);
- unregister_mtd_user(&trxsplit_notifier);
-}
-
-static int __init trxsplit_init(void)
-{
- int ret;
-
- trxsplit_find_trx();
-
- ret = trxsplit_create_partitions();
- return ret;
-}
-
-late_initcall(trxsplit_init);
projects / openwrt / svn-archive / archive.git / blobdiff