| /* |
| * $Id: redboot.c,v 1.6 2001/10/25 09:16:06 dwmw2 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/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 |
| }; |
| |
| struct fis_list { |
| struct fis_image_desc *img; |
| struct fis_list *next; |
| }; |
| |
| static inline int redboot_checksum(struct fis_image_desc *img) |
| { |
| /* RedBoot doesn't actually write the desc_cksum field yet AFAICT */ |
| return 1; |
| } |
| |
| int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts) |
| { |
| 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; |
| int namelen = 0; |
| |
| buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| |
| 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 (ret) |
| goto out; |
| |
| if (retlen != PAGE_SIZE) { |
| 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)) |
| break; |
| } |
| if (i == 3) { |
| /* 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 < PAGE_SIZE / sizeof(struct fis_image_desc); i++) { |
| struct fis_list *new_fl, **prev; |
| |
| if (buf[i].name[0] == 0xff) |
| break; |
| 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]; |
| 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++; |
| } |
| if (fl->img->flash_base) |
| nrparts++; |
| |
| 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++; |
| } |
| parts = kmalloc(sizeof(*parts)*nrparts + namelen, GFP_KERNEL); |
| |
| if (!parts) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| names = (char *)&parts[nrparts]; |
| memset(parts, 0, sizeof(*parts)*nrparts + namelen); |
| i=0; |
| |
| if (fl->img->flash_base) { |
| parts[0].name = "unallocated space"; |
| parts[0].size = fl->img->flash_base; |
| parts[0].offset = 0; |
| } |
| 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); |
| names += strlen(names)+1; |
| |
| 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 = "unallocated space"; |
| } |
| 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); |
| } |
| kfree(buf); |
| return ret; |
| } |
| |
| EXPORT_SYMBOL(parse_redboot_partitions); |
| |
| 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"); |