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Based on 1 normalized pattern(s): 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 st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 50 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091649.499889647@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
318 lines
8.2 KiB
C
318 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/of.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/module.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 void parse_redboot_of(struct mtd_info *master)
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{
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struct device_node *np;
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u32 dirblock;
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int ret;
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np = mtd_get_of_node(master);
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if (!np)
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return;
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ret = of_property_read_u32(np, "fis-index-block", &dirblock);
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if (ret)
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return;
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/*
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* Assign the block found in the device tree to the local
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* directory block pointer.
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*/
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directory = dirblock;
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}
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static int parse_redboot_partitions(struct mtd_info *master,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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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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parse_redboot_of(master);
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if ( directory < 0 ) {
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offset = master->size + directory * master->erasesize;
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while (mtd_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 (mtd_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 = mtd_read(master, offset, master->erasesize, &retlen,
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(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 (data && data->origin)
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buf[i].flash_base -= data->origin;
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else
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buf[i].flash_base &= master->size-1;
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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 const struct of_device_id mtd_parser_redboot_of_match_table[] = {
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{ .compatible = "redboot-fis" },
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{},
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};
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MODULE_DEVICE_TABLE(of, mtd_parser_redboot_of_match_table);
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static struct mtd_part_parser redboot_parser = {
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.parse_fn = parse_redboot_partitions,
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.name = "RedBoot",
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.of_match_table = mtd_parser_redboot_of_match_table,
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};
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module_mtd_part_parser(redboot_parser);
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/* mtd parsers will request the module by parser name */
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MODULE_ALIAS("RedBoot");
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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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