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https://github.com/brain-hackers/u-boot-brain
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315 lines
6.5 KiB
C
315 lines
6.5 KiB
C
![]() |
// SPDX-License-Identifier: GPL-2.0+
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/*
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* cmd_mbr.c -- MBR (Master Boot Record) handling command
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*
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* Copyright (C) 2020 Samsung Electronics
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* author: Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* based on the gpt command.
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*/
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#include <common.h>
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#include <blk.h>
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#include <command.h>
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#include <malloc.h>
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#include <part.h>
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/**
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* extract_val() - Extract a value from the key=value pair list
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* @str: pointer to string with key=values pairs
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* @key: pointer to the key to search for
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*
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* The list of parameters is come separated, only a value for
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* the given key is returend.
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*
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* Function allocates memory for the value, remember to free!
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*
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* Return: Pointer to allocated string with the value.
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*/
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static char *extract_val(const char *str, const char *key)
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{
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char *v, *k;
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char *s, *strcopy;
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char *new = NULL;
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strcopy = strdup(str);
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if (strcopy == NULL)
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return NULL;
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s = strcopy;
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while (s) {
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v = strsep(&s, ",");
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if (!v)
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break;
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k = strsep(&v, "=");
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if (!k)
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break;
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if (strcmp(k, key) == 0) {
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new = strdup(v);
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break;
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}
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}
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free(strcopy);
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return new;
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}
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/**
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* found_key() - Search for a key without a value in the parameter list
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* @str: pointer to string with key
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* @key: pointer to the key to search for
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*
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* The list of parameters is come separated.
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*
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* Return: True if key has been found.
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*/
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static bool found_key(const char *str, const char *key)
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{
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char *k;
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char *s, *strcopy;
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bool result = false;
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strcopy = strdup(str);
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if (!strcopy)
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return NULL;
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s = strcopy;
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while (s) {
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k = strsep(&s, ",");
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if (!k)
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break;
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if (strcmp(k, key) == 0) {
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result = true;
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break;
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}
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}
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free(strcopy);
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return result;
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}
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static int str_to_partitions(const char *str_part, int blksz,
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unsigned long *disk_uuid, struct disk_partition **partitions,
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int *parts_count)
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{
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char *tok, *str, *s;
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int i;
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char *val, *p;
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int p_count;
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struct disk_partition *parts;
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int errno = 0;
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uint64_t size_ll, start_ll;
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if (str_part == NULL)
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return -1;
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str = strdup(str_part);
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if (str == NULL)
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return -ENOMEM;
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/* extract disk guid */
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s = str;
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val = extract_val(str, "uuid_disk");
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if (val) {
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val = strsep(&val, ";");
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p = val;
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*disk_uuid = ustrtoull(p, &p, 0);
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free(val);
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/* Move s to first partition */
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strsep(&s, ";");
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}
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if (s == NULL) {
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printf("Error: is the partitions string NULL-terminated?\n");
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return -EINVAL;
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}
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/* remove the optional semicolon at the end of the string */
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i = strlen(s) - 1;
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if (s[i] == ';')
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s[i] = '\0';
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/* calculate expected number of partitions */
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p_count = 1;
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p = s;
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while (*p) {
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if (*p++ == ';')
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p_count++;
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}
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/* allocate memory for partitions */
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parts = calloc(sizeof(struct disk_partition), p_count);
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if (parts == NULL)
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return -ENOMEM;
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/* retrieve partitions data from string */
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for (i = 0; i < p_count; i++) {
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tok = strsep(&s, ";");
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if (tok == NULL)
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break;
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/* size */
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val = extract_val(tok, "size");
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if (!val) { /* 'size' is mandatory */
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errno = -4;
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goto err;
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}
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p = val;
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if ((strcmp(p, "-") == 0)) {
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/* auto extend the size */
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parts[i].size = 0;
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} else {
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size_ll = ustrtoull(p, &p, 0);
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parts[i].size = size_ll / blksz;
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}
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free(val);
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/* start address */
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val = extract_val(tok, "start");
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if (val) { /* start address is optional */
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p = val;
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start_ll = ustrtoull(p, &p, 0);
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parts[i].start = start_ll / blksz;
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free(val);
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}
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/* system id */
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val = extract_val(tok, "id");
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if (!val) { /* '' is mandatory */
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errno = -4;
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goto err;
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}
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p = val;
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parts[i].sys_ind = ustrtoul(p, &p, 0);
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free(val);
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/* bootable */
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if (found_key(tok, "bootable"))
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parts[i].bootable = PART_BOOTABLE;
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}
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*parts_count = p_count;
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*partitions = parts;
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free(str);
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return 0;
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err:
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free(str);
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free(parts);
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return errno;
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}
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static int do_write_mbr(struct blk_desc *dev, const char *str)
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{
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unsigned long disk_uuid = 0;
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struct disk_partition *partitions;
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int blksz = dev->blksz;
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int count;
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if (str_to_partitions(str, blksz, &disk_uuid, &partitions, &count)) {
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printf("MBR: failed to setup partitions from \"%s\"\n", str);
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return -1;
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}
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if (layout_mbr_partitions(partitions, count, dev->lba)) {
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printf("MBR: failed to layout partitions on the device\n");
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free(partitions);
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return -1;
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}
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if (write_mbr_partitions(dev, partitions, count, disk_uuid)) {
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printf("MBR: failed to write partitions to the device\n");
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free(partitions);
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return -1;
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}
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return 0;
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}
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static int do_verify_mbr(struct blk_desc *dev, const char *str)
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{
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unsigned long disk_uuid = 0;
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struct disk_partition *partitions;
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int blksz = dev->blksz;
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int count, i, ret = 1;
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if (str_to_partitions(str, blksz, &disk_uuid, &partitions, &count)) {
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printf("MBR: failed to setup partitions from \"%s\"\n", str);
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return -1;
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}
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for (i = 0; i < count; i++) {
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struct disk_partition p;
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if (part_get_info(dev, i+1, &p))
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goto fail;
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if ((partitions[i].size && p.size < partitions[i].size) ||
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(partitions[i].start && p.start < partitions[i].start) ||
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(p.sys_ind != partitions[i].sys_ind))
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goto fail;
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}
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ret = 0;
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fail:
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free(partitions);
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return ret;
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}
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static int do_mbr(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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const char *parts = NULL;
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int ret = CMD_RET_SUCCESS;
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int dev = 0;
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char *ep;
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struct blk_desc *blk_dev_desc = NULL;
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if (argc != 4 && argc != 5)
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return CMD_RET_USAGE;
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dev = (int)simple_strtoul(argv[3], &ep, 10);
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if (!ep || ep[0] != '\0') {
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printf("'%s' is not a number\n", argv[3]);
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return CMD_RET_USAGE;
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}
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blk_dev_desc = blk_get_dev(argv[2], dev);
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if (!blk_dev_desc) {
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printf("%s: %s dev %d NOT available\n",
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__func__, argv[2], dev);
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return CMD_RET_FAILURE;
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}
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if ((strcmp(argv[1], "write") == 0)) {
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parts = (argc == 5) ? argv[4] : env_get("mbr_parts");
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printf("MBR: write ");
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ret = do_write_mbr(blk_dev_desc, parts);
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} else if ((strcmp(argv[1], "verify") == 0)) {
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printf("MBR: verify ");
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parts = (argc == 5) ? argv[4] : env_get("mbr_parts");
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ret = do_verify_mbr(blk_dev_desc, parts);
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} else {
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return CMD_RET_USAGE;
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}
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if (ret) {
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printf("error!\n");
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return CMD_RET_FAILURE;
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}
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printf("success!\n");
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(mbr, CONFIG_SYS_MAXARGS, 1, do_mbr,
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"MBR (Master Boot Record)",
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"<command> <interface> <dev> <partitions_list>\n"
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" - MBR partition table restoration utility\n"
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" Restore or check partition information on a device connected\n"
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" to the given block interface\n"
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" Example usage:\n"
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" mbr write mmc 0 [\"${mbr_parts}\"]\n"
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" mbr verify mmc 0 [\"${partitions}\"]\n"
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);
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