brain-hackers_pepepper-mirror/u-boot-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-06-09 23:36:03 +09:00
Code Issues Projects Releases Wiki Activity

GPT: read partition table from device into a data structure

Browse Source 
Make the partition table available for modification by reading it from
the user-specified device into a linked list.   Provide an accessor
function for command-line testing.

Signed-off-by: Alison Chaiken <alison@peloton-tech.com>
[trini: Make this depend on CMD_GPT_RENAME, as it is the user of this
code]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Alison Chaiken 2017-07-04 11:18:50 -07:00 committed by Tom Rini
parent 73d6d18b71
commit 09a49930e4
2 changed files with 132 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
cmd/gpt.c
View File

@ -19,6 +19,9 @@
#include <linux/ctype.h>
#include <div64.h>
#include <memalign.h>
#include <linux/compat.h>
static LIST_HEAD(disk_partitions);
/**
* extract_env(): Expand env name from string format '&{env_name}'
@ -151,6 +154,122 @@ static bool found_key(const char *str, const char *key)
return result;
}
#ifdef CONFIG_CMD_GPT_RENAME
static void del_gpt_info(void)
{
struct list_head *pos = &disk_partitions;
struct disk_part *curr;
while (!list_empty(pos)) {
curr = list_entry(pos->next, struct disk_part, list);
list_del(pos->next);
free(curr);
}
}
static struct disk_part *allocate_disk_part(disk_partition_t *info, int partnum)
{
struct disk_part *newpart;
newpart = malloc(sizeof(*newpart));
if (!newpart)
return ERR_PTR(-ENOMEM);
memset(newpart, '\0', sizeof(newpart));
newpart->gpt_part_info.start = info->start;
newpart->gpt_part_info.size = info->size;
newpart->gpt_part_info.blksz = info->blksz;
strncpy((char *)newpart->gpt_part_info.name, (const char *)info->name,
PART_NAME_LEN);
newpart->gpt_part_info.name[PART_NAME_LEN - 1] = '\0';
strncpy((char *)newpart->gpt_part_info.type, (const char *)info->type,
PART_TYPE_LEN);
newpart->gpt_part_info.type[PART_TYPE_LEN - 1] = '\0';
newpart->gpt_part_info.bootable = info->bootable;
#ifdef CONFIG_PARTITION_UUIDS
strncpy(newpart->gpt_part_info.uuid, (const char *)info->uuid,
UUID_STR_LEN);
/* UUID_STR_LEN is correct, as uuid[]'s length is UUID_STR_LEN+1 chars */
newpart->gpt_part_info.uuid[UUID_STR_LEN] = '\0';
#endif
newpart->partnum = partnum;
return newpart;
}
static void print_gpt_info(void)
{
struct list_head *pos;
struct disk_part *curr;
list_for_each(pos, &disk_partitions) {
curr = list_entry(pos, struct disk_part, list);
printf("Partition %d:\n", curr->partnum);
printf("1st block %x, size %x\n", (unsigned)curr->gpt_part_info.start,
(unsigned)curr->gpt_part_info.size);
printf("Block size %lu, name %s\n", curr->gpt_part_info.blksz,
curr->gpt_part_info.name);
printf("Type %s, bootable %d\n", curr->gpt_part_info.type,
curr->gpt_part_info.bootable);
#ifdef CONFIG_PARTITION_UUIDS
printf("UUID %s\n", curr->gpt_part_info.uuid);
#endif
printf("\n");
}
}
/*
* read partition info into disk_partitions list where
* it can be printed or modified
*/
static int get_gpt_info(struct blk_desc *dev_desc)
{
/* start partition numbering at 1, as U-Boot does */
int valid_parts = 0, p, ret;
disk_partition_t info;
struct disk_part *new_disk_part;
if (disk_partitions.next == NULL)
INIT_LIST_HEAD(&disk_partitions);
for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
ret = part_get_info(dev_desc, p, &info);
if (ret)
continue;
/* Add 1 here because counter is zero-based but p1 is
the first partition */
new_disk_part = allocate_disk_part(&info, valid_parts+1);
if (IS_ERR(new_disk_part))
goto out;
list_add_tail(&new_disk_part->list, &disk_partitions);
valid_parts++;
}
if (valid_parts == 0) {
printf("** No valid partitions found **\n");
goto out;
}
return valid_parts;
out:
if (valid_parts >= 1)
del_gpt_info();
return -ENODEV;
}
/* a wrapper to test get_gpt_info */
static int do_get_gpt_info(struct blk_desc *dev_desc)
{
int ret;
ret = get_gpt_info(dev_desc);
if (ret > 0) {
print_gpt_info();
del_gpt_info();
return 0;
}
return ret;
}
#endif
/**
* set_gpt_info(): Fill partition information from string
* function allocates memory, remember to free!
@ -455,6 +574,10 @@ static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
printf("Verify GPT: ");
} else if (strcmp(argv[1], "guid") == 0) {
ret = do_disk_guid(blk_dev_desc, argv[4]);
#ifdef CONFIG_CMD_GPT_RENAME
} else if (strcmp(argv[1], "read") == 0) {
ret = do_get_gpt_info(blk_dev_desc);
#endif
} else {
return CMD_RET_USAGE;
}
@ -477,6 +600,8 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
" Example usage:\n"
" gpt write mmc 0 $partitions\n"
" gpt verify mmc 0 $partitions\n"
" read <interface> <dev>\n"
" - read GPT into a data structure for manipulation\n"
" guid <interface> <dev>\n"
" - print disk GUID\n"
" guid <interface> <dev> <varname>\n"

7
include/part.h
View File

@ -10,6 +10,7 @@
#include <blk.h>
#include <ide.h>
#include <uuid.h>
#include <linux/list.h>
struct block_drvr {
char *name;
@ -69,6 +70,12 @@ typedef struct disk_partition {
#endif
} disk_partition_t;
struct disk_part {
int partnum;
disk_partition_t gpt_part_info;
struct list_head list;
};
/* Misc _get_dev functions */
#ifdef CONFIG_PARTITIONS
/**