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gpt: Support for new "gpt" command

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New command - "gpt" is supported. It restores the GPT partition table.
It looks into the given environment variable for partitions definition.
It can be enabled at target configuration file with CONFIG_CMD_GPT.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
master
Piotr Wilczek 12 years ago committed by Tom Rini
parent 40684ddb83
commit 8b09623766
2 changed files with 334 additions and 0 deletions
  1. 1
      common/Makefile
  2. 333
      common/cmd_gpt.c

1
common/Makefile
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@ -198,6 +198,7 @@ COBJS-$(CONFIG_MODEM_SUPPORT) += modem.o
COBJS-$(CONFIG_UPDATE_TFTP) += update.o
COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
COBJS-$(CONFIG_CMD_DFU) += cmd_dfu.o
COBJS-$(CONFIG_CMD_GPT) += cmd_gpt.o
endif
ifdef CONFIG_SPL_BUILD

333
common/cmd_gpt.c
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@ -0,0 +1,333 @@
/*
* cmd_gpt.c -- GPT (GUID Partition Table) handling command
*
* Copyright (C) 2012 Samsung Electronics
* author: Lukasz Majewski <l.majewski@samsung.com>
* author: Piotr Wilczek <p.wilczek@samsung.com>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <common.h>
#include <malloc.h>
#include <command.h>
#include <mmc.h>
#include <part_efi.h>
#include <exports.h>
#include <linux/ctype.h>
#ifndef CONFIG_PARTITION_UUIDS
#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
#endif
/**
* extract_env(): Expand env name from string format '&{env_name}'
* and return pointer to the env (if the env is set)
*
* @param str - pointer to string
* @param env - pointer to pointer to extracted env
*
* @return - zero on successful expand and env is set
*/
static char extract_env(const char *str, char **env)
{
char *e, *s;
if (!str || strlen(str) < 4)
return -1;
if ((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')) {
s = strdup(str);
if (s == NULL)
return -1;
memset(s + strlen(s) - 1, '\0', 1);
memmove(s, s + 2, strlen(s) - 1);
e = getenv(s);
free(s);
if (e == NULL) {
printf("Environmental '%s' not set\n", str);
return -1; /* env not set */
}
*env = e;
return 0;
}
return -1;
}
/**
* extract_val(): Extract value from a key=value pair list (comma separated).
* Only value for the given key is returend.
* Function allocates memory for the value, remember to free!
*
* @param str - pointer to string with key=values pairs
* @param key - pointer to the key to search for
*
* @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;
}
/**
* set_gpt_info(): Fill partition information from string
* function allocates memory, remember to free!
*
* @param dev_desc - pointer block device descriptor
* @param str_part - pointer to string with partition information
* @param str_disk_guid - pointer to pointer to allocated string with disk guid
* @param partitions - pointer to pointer to allocated partitions array
* @param parts_count - number of partitions
*
* @return - zero on success, otherwise error
*
*/
static int set_gpt_info(block_dev_desc_t *dev_desc,
const char *str_part,
char **str_disk_guid,
disk_partition_t **partitions,
u8 *parts_count)
{
char *tok, *str, *s;
int i;
char *val, *p;
int p_count;
disk_partition_t *parts;
int errno = 0;
debug("%s: MMC lba num: 0x%x %d\n", __func__,
(unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
if (str_part == NULL)
return -1;
str = strdup(str_part);
/* extract disk guid */
s = str;
tok = strsep(&s, ";");
val = extract_val(tok, "uuid_disk");
if (!val) {
free(str);
return -2;
}
if (extract_env(val, &p))
p = val;
*str_disk_guid = strdup(p);
free(val);
if (strlen(s) == 0)
return -3;
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(disk_partition_t), p_count);
/* retrive partions data from string */
for (i = 0; i < p_count; i++) {
tok = strsep(&s, ";");
if (tok == NULL)
break;
/* uuid */
val = extract_val(tok, "uuid");
if (!val) { /* 'uuid' is mandatory */
errno = -4;
goto err;
}
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].uuid)) {
printf("Wrong uuid format for partition %d\n", i);
errno = -4;
goto err;
}
strcpy((char *)parts[i].uuid, p);
free(val);
/* name */
val = extract_val(tok, "name");
if (!val) { /* name is mandatory */
errno = -4;
goto err;
}
if (extract_env(val, &p))
p = val;
if (strlen(p) >= sizeof(parts[i].name)) {
errno = -4;
goto err;
}
strcpy((char *)parts[i].name, p);
free(val);
/* size */
val = extract_val(tok, "size");
if (!val) { /* 'size' is mandatory */
errno = -4;
goto err;
}
if (extract_env(val, &p))
p = val;
parts[i].size = ustrtoul(p, &p, 0);
parts[i].size /= dev_desc->blksz;
free(val);
/* start address */
val = extract_val(tok, "start");
if (val) { /* start address is optional */
if (extract_env(val, &p))
p = val;
parts[i].start = ustrtoul(p, &p, 0);
parts[i].start /= dev_desc->blksz;
free(val);
}
}
*parts_count = p_count;
*partitions = parts;
free(str);
return 0;
err:
free(str);
free(*str_disk_guid);
free(parts);
return errno;
}
static int gpt_mmc_default(int dev, const char *str_part)
{
int ret;
char *str_disk_guid;
u8 part_count = 0;
disk_partition_t *partitions = NULL;
struct mmc *mmc = find_mmc_device(dev);
if (mmc == NULL) {
printf("%s: mmc dev %d NOT available\n", __func__, dev);
return CMD_RET_FAILURE;
}
if (!str_part)
return -1;
/* fill partitions */
ret = set_gpt_info(&mmc->block_dev, str_part,
&str_disk_guid, &partitions, &part_count);
if (ret) {
if (ret == -1)
printf("No partition list provided\n");
if (ret == -2)
printf("Missing disk guid\n");
if ((ret == -3) || (ret == -4))
printf("Partition list incomplete\n");
return -1;
}
/* save partitions layout to disk */
gpt_restore(&mmc->block_dev, str_disk_guid, partitions, part_count);
free(str_disk_guid);
free(partitions);
return 0;
}
/**
* do_gpt(): Perform GPT operations
*
* @param cmdtp - command name
* @param flag
* @param argc
* @param argv
*
* @return zero on success; otherwise error
*/
static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int ret = CMD_RET_SUCCESS;
int dev = 0;
char *pstr;
if (argc < 5)
return CMD_RET_USAGE;
/* command: 'write' */
if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
/* device: 'mmc' */
if (strcmp(argv[2], "mmc") == 0) {
/* check if 'dev' is a number */
for (pstr = argv[3]; *pstr != '\0'; pstr++)
if (!isdigit(*pstr)) {
printf("'%s' is not a number\n",
argv[3]);
return CMD_RET_USAGE;
}
dev = (int)simple_strtoul(argv[3], NULL, 10);
/* write to mmc */
if (gpt_mmc_default(dev, argv[4]))
return CMD_RET_FAILURE;
}
} else {
return CMD_RET_USAGE;
}
return ret;
}
U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
"GUID Partition Table",
"<command> <interface> <dev> <partions_list>\n"
" - GUID partition table restoration\n"
" Restore GPT information on a device connected\n"
" to interface\n"
);
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