mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +00:00
315 lines
6.5 KiB
C
315 lines
6.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
/*
|
||
|
* cmd_mbr.c -- MBR (Master Boot Record) handling command
|
||
|
*
|
||
|
* Copyright (C) 2020 Samsung Electronics
|
||
|
* author: Marek Szyprowski <m.szyprowski@samsung.com>
|
||
|
*
|
||
|
* based on the gpt command.
|
||
|
*/
|
||
|
|
||
|
#include <common.h>
|
||
|
#include <blk.h>
|
||
|
#include <command.h>
|
||
|
#include <malloc.h>
|
||
|
#include <part.h>
|
||
|
|
||
|
/**
|
||
|
* extract_val() - Extract a value from the key=value pair list
|
||
|
* @str: pointer to string with key=values pairs
|
||
|
* @key: pointer to the key to search for
|
||
|
*
|
||
|
* The list of parameters is come separated, only a value for
|
||
|
* the given key is returend.
|
||
|
*
|
||
|
* Function allocates memory for the value, remember to free!
|
||
|
*
|
||
|
* Return: Pointer to allocated string with the value.
|
||
|
*/
|
||
|
static char *extract_val(const char *str, const char *key)
|
||
|
{
|
||
|
char *v, *k;
|
||
|
char *s, *strcopy;
|
||
|
char *new = NULL;
|
||
|
|
||
|
strcopy = strdup(str);
|
||
|
if (strcopy == NULL)
|
||
|
return NULL;
|
||
|
|
||
|
s = strcopy;
|
||
|
while (s) {
|
||
|
v = strsep(&s, ",");
|
||
|
if (!v)
|
||
|
break;
|
||
|
k = strsep(&v, "=");
|
||
|
if (!k)
|
||
|
break;
|
||
|
if (strcmp(k, key) == 0) {
|
||
|
new = strdup(v);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
free(strcopy);
|
||
|
|
||
|
return new;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* found_key() - Search for a key without a value in the parameter list
|
||
|
* @str: pointer to string with key
|
||
|
* @key: pointer to the key to search for
|
||
|
*
|
||
|
* The list of parameters is come separated.
|
||
|
*
|
||
|
* Return: True if key has been found.
|
||
|
*/
|
||
|
static bool found_key(const char *str, const char *key)
|
||
|
{
|
||
|
char *k;
|
||
|
char *s, *strcopy;
|
||
|
bool result = false;
|
||
|
|
||
|
strcopy = strdup(str);
|
||
|
if (!strcopy)
|
||
|
return NULL;
|
||
|
|
||
|
s = strcopy;
|
||
|
while (s) {
|
||
|
k = strsep(&s, ",");
|
||
|
if (!k)
|
||
|
break;
|
||
|
if (strcmp(k, key) == 0) {
|
||
|
result = true;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
free(strcopy);
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
static int str_to_partitions(const char *str_part, int blksz,
|
||
|
unsigned long *disk_uuid, struct disk_partition **partitions,
|
||
|
int *parts_count)
|
||
|
{
|
||
|
char *tok, *str, *s;
|
||
|
int i;
|
||
|
char *val, *p;
|
||
|
int p_count;
|
||
|
struct disk_partition *parts;
|
||
|
int errno = 0;
|
||
|
uint64_t size_ll, start_ll;
|
||
|
|
||
|
if (str_part == NULL)
|
||
|
return -1;
|
||
|
|
||
|
str = strdup(str_part);
|
||
|
if (str == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
/* extract disk guid */
|
||
|
s = str;
|
||
|
val = extract_val(str, "uuid_disk");
|
||
|
if (val) {
|
||
|
val = strsep(&val, ";");
|
||
|
p = val;
|
||
|
*disk_uuid = ustrtoull(p, &p, 0);
|
||
|
free(val);
|
||
|
/* Move s to first partition */
|
||
|
strsep(&s, ";");
|
||
|
}
|
||
|
if (s == NULL) {
|
||
|
printf("Error: is the partitions string NULL-terminated?\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
/* remove the optional semicolon at the end of the string */
|
||
|
i = strlen(s) - 1;
|
||
|
if (s[i] == ';')
|
||
|
s[i] = '\0';
|
||
|
|
||
|
/* calculate expected number of partitions */
|
||
|
p_count = 1;
|
||
|
p = s;
|
||
|
while (*p) {
|
||
|
if (*p++ == ';')
|
||
|
p_count++;
|
||
|
}
|
||
|
|
||
|
/* allocate memory for partitions */
|
||
|
parts = calloc(sizeof(struct disk_partition), p_count);
|
||
|
if (parts == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
/* retrieve partitions data from string */
|
||
|
for (i = 0; i < p_count; i++) {
|
||
|
tok = strsep(&s, ";");
|
||
|
|
||
|
if (tok == NULL)
|
||
|
break;
|
||
|
|
||
|
/* size */
|
||
|
val = extract_val(tok, "size");
|
||
|
if (!val) { /* 'size' is mandatory */
|
||
|
errno = -4;
|
||
|
goto err;
|
||
|
}
|
||
|
p = val;
|
||
|
if ((strcmp(p, "-") == 0)) {
|
||
|
/* auto extend the size */
|
||
|
parts[i].size = 0;
|
||
|
} else {
|
||
|
size_ll = ustrtoull(p, &p, 0);
|
||
|
parts[i].size = size_ll / blksz;
|
||
|
}
|
||
|
free(val);
|
||
|
|
||
|
/* start address */
|
||
|
val = extract_val(tok, "start");
|
||
|
if (val) { /* start address is optional */
|
||
|
p = val;
|
||
|
start_ll = ustrtoull(p, &p, 0);
|
||
|
parts[i].start = start_ll / blksz;
|
||
|
free(val);
|
||
|
}
|
||
|
|
||
|
/* system id */
|
||
|
val = extract_val(tok, "id");
|
||
|
if (!val) { /* '' is mandatory */
|
||
|
errno = -4;
|
||
|
goto err;
|
||
|
}
|
||
|
p = val;
|
||
|
parts[i].sys_ind = ustrtoul(p, &p, 0);
|
||
|
free(val);
|
||
|
|
||
|
/* bootable */
|
||
|
if (found_key(tok, "bootable"))
|
||
|
parts[i].bootable = PART_BOOTABLE;
|
||
|
}
|
||
|
|
||
|
*parts_count = p_count;
|
||
|
*partitions = parts;
|
||
|
free(str);
|
||
|
|
||
|
return 0;
|
||
|
err:
|
||
|
free(str);
|
||
|
free(parts);
|
||
|
|
||
|
return errno;
|
||
|
}
|
||
|
|
||
|
static int do_write_mbr(struct blk_desc *dev, const char *str)
|
||
|
{
|
||
|
unsigned long disk_uuid = 0;
|
||
|
struct disk_partition *partitions;
|
||
|
int blksz = dev->blksz;
|
||
|
int count;
|
||
|
|
||
|
if (str_to_partitions(str, blksz, &disk_uuid, &partitions, &count)) {
|
||
|
printf("MBR: failed to setup partitions from \"%s\"\n", str);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if (layout_mbr_partitions(partitions, count, dev->lba)) {
|
||
|
printf("MBR: failed to layout partitions on the device\n");
|
||
|
free(partitions);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if (write_mbr_partitions(dev, partitions, count, disk_uuid)) {
|
||
|
printf("MBR: failed to write partitions to the device\n");
|
||
|
free(partitions);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int do_verify_mbr(struct blk_desc *dev, const char *str)
|
||
|
{
|
||
|
unsigned long disk_uuid = 0;
|
||
|
struct disk_partition *partitions;
|
||
|
int blksz = dev->blksz;
|
||
|
int count, i, ret = 1;
|
||
|
|
||
|
if (str_to_partitions(str, blksz, &disk_uuid, &partitions, &count)) {
|
||
|
printf("MBR: failed to setup partitions from \"%s\"\n", str);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < count; i++) {
|
||
|
struct disk_partition p;
|
||
|
|
||
|
if (part_get_info(dev, i+1, &p))
|
||
|
goto fail;
|
||
|
|
||
|
if ((partitions[i].size && p.size < partitions[i].size) ||
|
||
|
(partitions[i].start && p.start < partitions[i].start) ||
|
||
|
(p.sys_ind != partitions[i].sys_ind))
|
||
|
goto fail;
|
||
|
}
|
||
|
ret = 0;
|
||
|
fail:
|
||
|
free(partitions);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int do_mbr(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
|
||
|
{
|
||
|
const char *parts = NULL;
|
||
|
int ret = CMD_RET_SUCCESS;
|
||
|
int dev = 0;
|
||
|
char *ep;
|
||
|
struct blk_desc *blk_dev_desc = NULL;
|
||
|
|
||
|
if (argc != 4 && argc != 5)
|
||
|
return CMD_RET_USAGE;
|
||
|
|
||
|
dev = (int)simple_strtoul(argv[3], &ep, 10);
|
||
|
if (!ep || ep[0] != '\0') {
|
||
|
printf("'%s' is not a number\n", argv[3]);
|
||
|
return CMD_RET_USAGE;
|
||
|
}
|
||
|
blk_dev_desc = blk_get_dev(argv[2], dev);
|
||
|
if (!blk_dev_desc) {
|
||
|
printf("%s: %s dev %d NOT available\n",
|
||
|
__func__, argv[2], dev);
|
||
|
return CMD_RET_FAILURE;
|
||
|
}
|
||
|
|
||
|
if ((strcmp(argv[1], "write") == 0)) {
|
||
|
parts = (argc == 5) ? argv[4] : env_get("mbr_parts");
|
||
|
printf("MBR: write ");
|
||
|
ret = do_write_mbr(blk_dev_desc, parts);
|
||
|
} else if ((strcmp(argv[1], "verify") == 0)) {
|
||
|
printf("MBR: verify ");
|
||
|
parts = (argc == 5) ? argv[4] : env_get("mbr_parts");
|
||
|
ret = do_verify_mbr(blk_dev_desc, parts);
|
||
|
} else {
|
||
|
return CMD_RET_USAGE;
|
||
|
}
|
||
|
|
||
|
if (ret) {
|
||
|
printf("error!\n");
|
||
|
return CMD_RET_FAILURE;
|
||
|
}
|
||
|
|
||
|
printf("success!\n");
|
||
|
return CMD_RET_SUCCESS;
|
||
|
}
|
||
|
|
||
|
U_BOOT_CMD(mbr, CONFIG_SYS_MAXARGS, 1, do_mbr,
|
||
|
"MBR (Master Boot Record)",
|
||
|
"<command> <interface> <dev> <partitions_list>\n"
|
||
|
" - MBR partition table restoration utility\n"
|
||
|
" Restore or check partition information on a device connected\n"
|
||
|
" to the given block interface\n"
|
||
|
" Example usage:\n"
|
||
|
" mbr write mmc 0 [\"${mbr_parts}\"]\n"
|
||
|
" mbr verify mmc 0 [\"${partitions}\"]\n"
|
||
|
);
|