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@@ -0,0 +1,314 @@
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+// 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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+
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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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+/**
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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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+
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+ strcopy = strdup(str);
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+ if (strcopy == NULL)
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+ return NULL;
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+
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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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+
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+ free(strcopy);
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+
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+ return new;
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+}
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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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+
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+ strcopy = strdup(str);
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+ if (!strcopy)
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+ return NULL;
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+
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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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+
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+ free(strcopy);
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+
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+ return result;
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+}
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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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+
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+ if (str_part == NULL)
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+ return -1;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (tok == NULL)
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+ break;
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+
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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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+
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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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+
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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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+
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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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+
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+ *parts_count = p_count;
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+ *partitions = parts;
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+ free(str);
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+
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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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+
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+ return errno;
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+}
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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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+
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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+ for (i = 0; i < count; i++) {
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+ struct disk_partition p;
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+
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+ if (part_get_info(dev, i+1, &p))
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+ goto fail;
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+
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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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+
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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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+
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+ if (argc != 4 && argc != 5)
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+ return CMD_RET_USAGE;
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+
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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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+
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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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+
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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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+
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+ printf("success!\n");
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+ return CMD_RET_SUCCESS;
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+}
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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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