diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/Makefile | 1 | ||||
| -rw-r--r-- | common/cmd_gpt.c | 333 |
2 files changed, 334 insertions, 0 deletions
diff --git a/common/Makefile b/common/Makefile index 083df17..ce30359 100644 --- a/common/Makefile +++ b/common/Makefile @@ -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-$(CONFIG_CMD_GPT) += cmd_gpt.o endif ifdef CONFIG_SPL_BUILD diff --git a/common/cmd_gpt.c b/common/cmd_gpt.c new file mode 100644 index 0000000..da7705d --- /dev/null +++ b/common/cmd_gpt.c @@ -0,0 +1,333 @@ +/* + * cmd_gpt.c -- GPT (GUID Partition Table) handling command + * + * Copyright (C) 2012 Samsung Electronics + * author: Lukasz Majewski <l.majewski@samsung.com> + * author: Piotr Wilczek <p.wilczek@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <common.h> +#include <malloc.h> +#include <command.h> +#include <mmc.h> +#include <part_efi.h> +#include <exports.h> +#include <linux/ctype.h> + +#ifndef CONFIG_PARTITION_UUIDS +#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled +#endif + +/** + * extract_env(): Expand env name from string format '&{env_name}' + * and return pointer to the env (if the env is set) + * + * @param str - pointer to string + * @param env - pointer to pointer to extracted env + * + * @return - zero on successful expand and env is set + */ +static char extract_env(const char *str, char **env) +{ + char *e, *s; + + if (!str || strlen(str) < 4) + return -1; + + if ((strncmp(str, "${", 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" +); |