379 lines
9.1 KiB
C
379 lines
9.1 KiB
C
/*
|
|
* $Id: cmdlinepart.c,v 1.19 2005/11/07 11:14:19 gleixner Exp $
|
|
*
|
|
* Read flash partition table from command line
|
|
*
|
|
* Copyright 2002 SYSGO Real-Time Solutions GmbH
|
|
*
|
|
* The format for the command line is as follows:
|
|
*
|
|
* mtdparts=<mtddef>[;<mtddef]
|
|
* <mtddef> := <mtd-id>:<partdef>[,<partdef>]
|
|
* <partdef> := <size>[@offset][<name>][ro][lk]
|
|
* <mtd-id> := unique name used in mapping driver/device (mtd->name)
|
|
* <size> := standard linux memsize OR "-" to denote all remaining space
|
|
* <name> := '(' NAME ')'
|
|
*
|
|
* Examples:
|
|
*
|
|
* 1 NOR Flash, with 1 single writable partition:
|
|
* edb7312-nor:-
|
|
*
|
|
* 1 NOR Flash with 2 partitions, 1 NAND with one
|
|
* edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/bootmem.h>
|
|
|
|
/* error message prefix */
|
|
#define ERRP "mtd: "
|
|
|
|
/* debug macro */
|
|
#if 0
|
|
#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
|
|
#else
|
|
#define dbg(x)
|
|
#endif
|
|
|
|
|
|
/* special size referring to all the remaining space in a partition */
|
|
#define SIZE_REMAINING UINT_MAX
|
|
#define OFFSET_CONTINUOUS UINT_MAX
|
|
|
|
struct cmdline_mtd_partition {
|
|
struct cmdline_mtd_partition *next;
|
|
char *mtd_id;
|
|
int num_parts;
|
|
struct mtd_partition *parts;
|
|
};
|
|
|
|
/* mtdpart_setup() parses into here */
|
|
static struct cmdline_mtd_partition *partitions;
|
|
|
|
/* the command line passed to mtdpart_setupd() */
|
|
static char *cmdline;
|
|
static int cmdline_parsed = 0;
|
|
|
|
/*
|
|
* Parse one partition definition for an MTD. Since there can be many
|
|
* comma separated partition definitions, this function calls itself
|
|
* recursively until no more partition definitions are found. Nice side
|
|
* effect: the memory to keep the mtd_partition structs and the names
|
|
* is allocated upon the last definition being found. At that point the
|
|
* syntax has been verified ok.
|
|
*/
|
|
static struct mtd_partition * newpart(char *s,
|
|
char **retptr,
|
|
int *num_parts,
|
|
int this_part,
|
|
unsigned char **extra_mem_ptr,
|
|
int extra_mem_size)
|
|
{
|
|
struct mtd_partition *parts;
|
|
unsigned long size;
|
|
unsigned long offset = OFFSET_CONTINUOUS;
|
|
char *name;
|
|
int name_len;
|
|
unsigned char *extra_mem;
|
|
char delim;
|
|
unsigned int mask_flags;
|
|
|
|
/* fetch the partition size */
|
|
if (*s == '-')
|
|
{ /* assign all remaining space to this partition */
|
|
size = SIZE_REMAINING;
|
|
s++;
|
|
}
|
|
else
|
|
{
|
|
size = memparse(s, &s);
|
|
if (size < PAGE_SIZE)
|
|
{
|
|
printk(KERN_ERR ERRP "partition size too small (%lx)\n", size);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* fetch partition name and flags */
|
|
mask_flags = 0; /* this is going to be a regular partition */
|
|
delim = 0;
|
|
/* check for offset */
|
|
if (*s == '@')
|
|
{
|
|
s++;
|
|
offset = memparse(s, &s);
|
|
}
|
|
/* now look for name */
|
|
if (*s == '(')
|
|
{
|
|
delim = ')';
|
|
}
|
|
|
|
if (delim)
|
|
{
|
|
char *p;
|
|
|
|
name = ++s;
|
|
if ((p = strchr(name, delim)) == 0)
|
|
{
|
|
printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
|
|
return NULL;
|
|
}
|
|
name_len = p - name;
|
|
s = p + 1;
|
|
}
|
|
else
|
|
{
|
|
name = NULL;
|
|
name_len = 13; /* Partition_000 */
|
|
}
|
|
|
|
/* record name length for memory allocation later */
|
|
extra_mem_size += name_len + 1;
|
|
|
|
/* test for options */
|
|
if (strncmp(s, "ro", 2) == 0)
|
|
{
|
|
mask_flags |= MTD_WRITEABLE;
|
|
s += 2;
|
|
}
|
|
|
|
/* if lk is found do NOT unlock the MTD partition*/
|
|
if (strncmp(s, "lk", 2) == 0)
|
|
{
|
|
mask_flags |= MTD_POWERUP_LOCK;
|
|
s += 2;
|
|
}
|
|
|
|
/* test if more partitions are following */
|
|
if (*s == ',')
|
|
{
|
|
if (size == SIZE_REMAINING)
|
|
{
|
|
printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
|
|
return NULL;
|
|
}
|
|
/* more partitions follow, parse them */
|
|
if ((parts = newpart(s + 1, &s, num_parts,
|
|
this_part + 1, &extra_mem, extra_mem_size)) == 0)
|
|
return NULL;
|
|
}
|
|
else
|
|
{ /* this is the last partition: allocate space for all */
|
|
int alloc_size;
|
|
|
|
*num_parts = this_part + 1;
|
|
alloc_size = *num_parts * sizeof(struct mtd_partition) +
|
|
extra_mem_size;
|
|
parts = kzalloc(alloc_size, GFP_KERNEL);
|
|
if (!parts)
|
|
{
|
|
printk(KERN_ERR ERRP "out of memory\n");
|
|
return NULL;
|
|
}
|
|
extra_mem = (unsigned char *)(parts + *num_parts);
|
|
}
|
|
/* enter this partition (offset will be calculated later if it is zero at this point) */
|
|
parts[this_part].size = size;
|
|
parts[this_part].offset = offset;
|
|
parts[this_part].mask_flags = mask_flags;
|
|
if (name)
|
|
{
|
|
strlcpy(extra_mem, name, name_len + 1);
|
|
}
|
|
else
|
|
{
|
|
sprintf(extra_mem, "Partition_%03d", this_part);
|
|
}
|
|
parts[this_part].name = extra_mem;
|
|
extra_mem += name_len + 1;
|
|
|
|
dbg(("partition %d: name <%s>, offset %x, size %x, mask flags %x\n",
|
|
this_part,
|
|
parts[this_part].name,
|
|
parts[this_part].offset,
|
|
parts[this_part].size,
|
|
parts[this_part].mask_flags));
|
|
|
|
/* return (updated) pointer to extra_mem memory */
|
|
if (extra_mem_ptr)
|
|
*extra_mem_ptr = extra_mem;
|
|
|
|
/* return (updated) pointer command line string */
|
|
*retptr = s;
|
|
|
|
/* return partition table */
|
|
return parts;
|
|
}
|
|
|
|
/*
|
|
* Parse the command line.
|
|
*/
|
|
static int mtdpart_setup_real(char *s)
|
|
{
|
|
cmdline_parsed = 1;
|
|
|
|
for( ; s != NULL; )
|
|
{
|
|
struct cmdline_mtd_partition *this_mtd;
|
|
struct mtd_partition *parts;
|
|
int mtd_id_len;
|
|
int num_parts;
|
|
char *p, *mtd_id;
|
|
|
|
mtd_id = s;
|
|
/* fetch <mtd-id> */
|
|
if (!(p = strchr(s, ':')))
|
|
{
|
|
printk(KERN_ERR ERRP "no mtd-id\n");
|
|
return 0;
|
|
}
|
|
mtd_id_len = p - mtd_id;
|
|
|
|
dbg(("parsing <%s>\n", p+1));
|
|
|
|
/*
|
|
* parse one mtd. have it reserve memory for the
|
|
* struct cmdline_mtd_partition and the mtd-id string.
|
|
*/
|
|
parts = newpart(p + 1, /* cmdline */
|
|
&s, /* out: updated cmdline ptr */
|
|
&num_parts, /* out: number of parts */
|
|
0, /* first partition */
|
|
(unsigned char**)&this_mtd, /* out: extra mem */
|
|
mtd_id_len + 1 + sizeof(*this_mtd) +
|
|
sizeof(void*)-1 /*alignment*/);
|
|
if(!parts)
|
|
{
|
|
/*
|
|
* An error occurred. We're either:
|
|
* a) out of memory, or
|
|
* b) in the middle of the partition spec
|
|
* Either way, this mtd is hosed and we're
|
|
* unlikely to succeed in parsing any more
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/* align this_mtd */
|
|
this_mtd = (struct cmdline_mtd_partition *)
|
|
ALIGN((unsigned long)this_mtd, sizeof(void*));
|
|
/* enter results */
|
|
this_mtd->parts = parts;
|
|
this_mtd->num_parts = num_parts;
|
|
this_mtd->mtd_id = (char*)(this_mtd + 1);
|
|
strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
|
|
|
|
/* link into chain */
|
|
this_mtd->next = partitions;
|
|
partitions = this_mtd;
|
|
|
|
dbg(("mtdid=<%s> num_parts=<%d>\n",
|
|
this_mtd->mtd_id, this_mtd->num_parts));
|
|
|
|
|
|
/* EOS - we're done */
|
|
if (*s == 0)
|
|
break;
|
|
|
|
/* does another spec follow? */
|
|
if (*s != ';')
|
|
{
|
|
printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
|
|
return 0;
|
|
}
|
|
s++;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Main function to be called from the MTD mapping driver/device to
|
|
* obtain the partitioning information. At this point the command line
|
|
* arguments will actually be parsed and turned to struct mtd_partition
|
|
* information. It returns partitions for the requested mtd device, or
|
|
* the first one in the chain if a NULL mtd_id is passed in.
|
|
*/
|
|
static int parse_cmdline_partitions(struct mtd_info *master,
|
|
struct mtd_partition **pparts,
|
|
unsigned long origin)
|
|
{
|
|
unsigned long offset;
|
|
int i;
|
|
struct cmdline_mtd_partition *part;
|
|
char *mtd_id = master->name;
|
|
|
|
if(!cmdline)
|
|
return -EINVAL;
|
|
|
|
/* parse command line */
|
|
if (!cmdline_parsed)
|
|
mtdpart_setup_real(cmdline);
|
|
|
|
for(part = partitions; part; part = part->next)
|
|
{
|
|
if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
|
|
{
|
|
for(i = 0, offset = 0; i < part->num_parts; i++)
|
|
{
|
|
if (part->parts[i].offset == OFFSET_CONTINUOUS)
|
|
part->parts[i].offset = offset;
|
|
else
|
|
offset = part->parts[i].offset;
|
|
if (part->parts[i].size == SIZE_REMAINING)
|
|
part->parts[i].size = master->size - offset;
|
|
if (offset + part->parts[i].size > master->size)
|
|
{
|
|
printk(KERN_WARNING ERRP
|
|
"%s: partitioning exceeds flash size, truncating\n",
|
|
part->mtd_id);
|
|
part->parts[i].size = master->size - offset;
|
|
part->num_parts = i;
|
|
}
|
|
offset += part->parts[i].size;
|
|
}
|
|
*pparts = part->parts;
|
|
return part->num_parts;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
/*
|
|
* This is the handler for our kernel parameter, called from
|
|
* main.c::checksetup(). Note that we can not yet kmalloc() anything,
|
|
* so we only save the commandline for later processing.
|
|
*
|
|
* This function needs to be visible for bootloaders.
|
|
*/
|
|
static int mtdpart_setup(char *s)
|
|
{
|
|
cmdline = s;
|
|
return 1;
|
|
}
|
|
|
|
__setup("mtdparts=", mtdpart_setup);
|
|
|
|
static struct mtd_part_parser cmdline_parser = {
|
|
.owner = THIS_MODULE,
|
|
.parse_fn = parse_cmdline_partitions,
|
|
.name = "cmdlinepart",
|
|
};
|
|
|
|
static int __init cmdline_parser_init(void)
|
|
{
|
|
return register_mtd_parser(&cmdline_parser);
|
|
}
|
|
|
|
module_init(cmdline_parser_init);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
|
|
MODULE_DESCRIPTION("Command line configuration of MTD partitions");
|