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-rw-r--r--cmd/gpt.c456
1 files changed, 456 insertions, 0 deletions
diff --git a/cmd/gpt.c b/cmd/gpt.c
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+++ b/cmd/gpt.c
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+/*
+ * cmd_gpt.c -- GPT (GUID Partition Table) handling command
+ *
+ * Copyright (C) 2015
+ * Lukasz Majewski <l.majewski@majess.pl>
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * author: Lukasz Majewski <l.majewski@samsung.com>
+ * author: Piotr Wilczek <p.wilczek@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <command.h>
+#include <part_efi.h>
+#include <exports.h>
+#include <linux/ctype.h>
+#include <div64.h>
+#include <memalign.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 int extract_env(const char *str, char **env)
+{
+ int ret = -1;
+ char *e, *s;
+#ifdef CONFIG_RANDOM_UUID
+ char uuid_str[UUID_STR_LEN + 1];
+#endif
+
+ if (!str || strlen(str) < 4)
+ return -1;
+
+ if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
+ return -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);
+ if (e == NULL) {
+#ifdef CONFIG_RANDOM_UUID
+ debug("%s unset. ", str);
+ gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
+ setenv(s, uuid_str);
+
+ e = getenv(s);
+ if (e) {
+ debug("Set to random.\n");
+ ret = 0;
+ } else {
+ debug("Can't get random UUID.\n");
+ }
+#else
+ debug("%s unset.\n", str);
+#endif
+ } else {
+ debug("%s get from environment.\n", str);
+ ret = 0;
+ }
+
+ *env = e;
+ free(s);
+
+ return ret;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * found_key(): Found key without value in parameter list (comma separated).
+ *
+ * @param str - pointer to string with key
+ * @param key - pointer to the key to search for
+ *
+ * @return - true on found key
+ */
+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;
+}
+
+/**
+ * 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;
+ uint64_t size_ll, start_ll;
+
+ debug("%s: 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;
+ val = extract_val(str, "uuid_disk");
+ if (!val) {
+#ifdef CONFIG_RANDOM_UUID
+ *str_disk_guid = malloc(UUID_STR_LEN + 1);
+ gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
+#else
+ free(str);
+ return -2;
+#endif
+ } else {
+ val = strsep(&val, ";");
+ if (extract_env(val, &p))
+ p = val;
+ *str_disk_guid = strdup(p);
+ free(val);
+ /* Move s to first partition */
+ strsep(&s, ";");
+ }
+ 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);
+
+ /* retrieve partitions 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 optional if random uuid's are enabled */
+#ifdef CONFIG_RANDOM_UUID
+ gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
+#else
+ errno = -4;
+ goto err;
+#endif
+ } else {
+ 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);
+ }
+#ifdef CONFIG_PARTITION_TYPE_GUID
+ /* guid */
+ val = extract_val(tok, "type");
+ if (val) {
+ /* 'type' is optional */
+ if (extract_env(val, &p))
+ p = val;
+ if (strlen(p) >= sizeof(parts[i].type_guid)) {
+ printf("Wrong type guid format for partition %d\n",
+ i);
+ errno = -4;
+ goto err;
+ }
+ strcpy((char *)parts[i].type_guid, p);
+ free(val);
+ }
+#endif
+ /* 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;
+ size_ll = ustrtoull(p, &p, 0);
+ parts[i].size = lldiv(size_ll, 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;
+ start_ll = ustrtoull(p, &p, 0);
+ parts[i].start = lldiv(start_ll, dev_desc->blksz);
+ free(val);
+ }
+
+ /* bootable */
+ if (found_key(tok, "bootable"))
+ parts[i].bootable = 1;
+ }
+
+ *parts_count = p_count;
+ *partitions = parts;
+ free(str);
+
+ return 0;
+err:
+ free(str);
+ free(*str_disk_guid);
+ free(parts);
+
+ return errno;
+}
+
+static int gpt_default(block_dev_desc_t *blk_dev_desc, const char *str_part)
+{
+ int ret;
+ char *str_disk_guid;
+ u8 part_count = 0;
+ disk_partition_t *partitions = NULL;
+
+ /* fill partitions */
+ ret = set_gpt_info(blk_dev_desc, 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 */
+ ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
+ free(str_disk_guid);
+ free(partitions);
+
+ return ret;
+}
+
+static int gpt_verify(block_dev_desc_t *blk_dev_desc, const char *str_part)
+{
+ ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1,
+ blk_dev_desc->blksz);
+ disk_partition_t *partitions = NULL;
+ gpt_entry *gpt_pte = NULL;
+ char *str_disk_guid;
+ u8 part_count = 0;
+ int ret = 0;
+
+ /* fill partitions */
+ ret = set_gpt_info(blk_dev_desc, str_part,
+ &str_disk_guid, &partitions, &part_count);
+ if (ret) {
+ if (ret == -1) {
+ printf("No partition list provided - only basic check\n");
+ ret = gpt_verify_headers(blk_dev_desc, gpt_head,
+ &gpt_pte);
+ goto out;
+ }
+ if (ret == -2)
+ printf("Missing disk guid\n");
+ if ((ret == -3) || (ret == -4))
+ printf("Partition list incomplete\n");
+ return -1;
+ }
+
+ /* Check partition layout with provided pattern */
+ ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
+ gpt_head, &gpt_pte);
+ free(str_disk_guid);
+ free(partitions);
+ out:
+ free(gpt_pte);
+ return ret;
+}
+
+/**
+ * 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 *ep;
+ block_dev_desc_t *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 = 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) && (argc == 5)) {
+ printf("Writing GPT: ");
+ ret = gpt_default(blk_dev_desc, argv[4]);
+ } else if ((strcmp(argv[1], "verify") == 0)) {
+ ret = gpt_verify(blk_dev_desc, argv[4]);
+ printf("Verify GPT: ");
+ } else {
+ return CMD_RET_USAGE;
+ }
+
+ if (ret) {
+ printf("error!\n");
+ return CMD_RET_FAILURE;
+ }
+
+ printf("success!\n");
+ return CMD_RET_SUCCESS;
+}
+
+U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
+ "GUID Partition Table",
+ "<command> <interface> <dev> <partitions_list>\n"
+ " - GUID partition table restoration and validity check\n"
+ " Restore or verify GPT information on a device connected\n"
+ " to interface\n"
+ " Example usage:\n"
+ " gpt write mmc 0 $partitions\n"
+ " gpt verify mmc 0 $partitions\n"
+);
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