vbatts
/
grub
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
grub/grub-core/disk/ieee1275/ofdisk.c

360 lines
8.0 KiB
C
Raw Blame History

/* ofdisk.c - Open Firmware disk access. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2004,2006,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/ieee1275/ieee1275.h>
#include <grub/ieee1275/ofdisk.h>
static char *last_devpath;
static grub_ieee1275_ihandle_t last_ihandle;
struct ofdisk_hash_ent
{
char *devpath;
/* Pointer to shortest available name on nodes representing canonical names,
otherwise NULL. */
const char *shortest;
struct ofdisk_hash_ent *next;
};
#define OFDISK_HASH_SZ 8
static struct ofdisk_hash_ent *ofdisk_hash[OFDISK_HASH_SZ];
static int
ofdisk_hash_fn (const char *devpath)
{
int hash = 0;
while (*devpath)
hash ^= *devpath++;
return (hash & (OFDISK_HASH_SZ - 1));
}
static struct ofdisk_hash_ent *
ofdisk_hash_find (const char *devpath)
{
struct ofdisk_hash_ent *p = ofdisk_hash[ofdisk_hash_fn(devpath)];
while (p)
{
if (!grub_strcmp (p->devpath, devpath))
break;
p = p->next;
}
return p;
}
static struct ofdisk_hash_ent *
ofdisk_hash_add (char *devpath)
{
struct ofdisk_hash_ent **head = &ofdisk_hash[ofdisk_hash_fn(devpath)];
struct ofdisk_hash_ent *p, *pcan;
char *curcan;
p = grub_malloc(sizeof (*p));
if (!p)
return NULL;
p->devpath = devpath;
p->next = *head;
p->shortest = 0;
*head = p;
curcan = grub_ieee1275_canonicalise_devname (devpath);
if (!curcan)
{
grub_errno = GRUB_ERR_NONE;
return p;
}
pcan = ofdisk_hash_find (curcan);
if (!pcan)
pcan = ofdisk_hash_add (curcan);
else
grub_free (curcan);
if (!pcan)
grub_errno = GRUB_ERR_NONE;
else
{
if (!pcan->shortest
|| grub_strlen (pcan->shortest) > grub_strlen (devpath))
pcan->shortest = devpath;
}
return p;
}
static void
scan (void)
{
auto int dev_iterate (struct grub_ieee1275_devalias *alias);
int dev_iterate (struct grub_ieee1275_devalias *alias)
{
struct ofdisk_hash_ent *op;
grub_dprintf ("disk", "device name = %s type = %s\n", alias->name,
alias->type);
if (grub_strcmp (alias->type, "block") != 0)
return 0;
grub_dprintf ("disk", "disk name = %s\n", alias->name);
op = ofdisk_hash_find (alias->path);
if (!op)
{
char *name = grub_strdup (alias->name);
if (!name)
{
grub_errno = GRUB_ERR_NONE;
return 0;
}
op = ofdisk_hash_add (name);
}
return 0;
}
grub_devalias_iterate (dev_iterate);
grub_ieee1275_devices_iterate (dev_iterate);
}
static int
grub_ofdisk_iterate (int (*hook) (const char *name))
{
unsigned i;
scan ();
for (i = 0; i < ARRAY_SIZE (ofdisk_hash); i++)
{
static struct ofdisk_hash_ent *ent;
for (ent = ofdisk_hash[i]; ent; ent = ent->next)
{
if (!ent->shortest)
continue;
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY))
{
grub_ieee1275_phandle_t dev;
char tmp[8];
if (grub_ieee1275_finddevice (ent->devpath, &dev))
{
grub_dprintf ("disk", "finddevice (%s) failed\n",
ent->devpath);
continue;
}
if (grub_ieee1275_get_property (dev, "iconname", tmp,
sizeof tmp, 0))
{
grub_dprintf ("disk", "get iconname failed\n");
continue;
}
if (grub_strcmp (tmp, "sdmmc") != 0)
{
grub_dprintf ("disk", "device is not an SD card\n");
continue;
}
}
if (grub_strncmp (ent->shortest, "cdrom", 5) == 0)
continue;
if (hook (ent->shortest))
return 1;
}
}
return 0;
}
static char *
compute_dev_path (const char *name)
{
char *devpath = grub_malloc (grub_strlen (name) + 3);
char *p, c;
if (!devpath)
return NULL;
/* Un-escape commas. */
p = devpath;
while ((c = *name++) != '\0')
{
if (c == '\\' && *name == ',')
{
*p++ = ',';
name++;
}
else
*p++ = c;
}
*p++ = '\0';
return devpath;
}
static grub_err_t
grub_ofdisk_open (const char *name, grub_disk_t disk)
{
grub_ieee1275_phandle_t dev;
char *devpath;
/* XXX: This should be large enough for any possible case. */
char prop[64];
grub_ssize_t actual;
devpath = compute_dev_path (name);
if (! devpath)
return grub_errno;
grub_dprintf ("disk", "Opening `%s'.\n", devpath);
if (grub_ieee1275_finddevice (devpath, &dev))
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't read device properties");
if (grub_ieee1275_get_property (dev, "device_type", prop, sizeof (prop),
&actual))
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't read the device type");
if (grub_strcmp (prop, "block"))
return grub_error (GRUB_ERR_BAD_DEVICE, "not a block device");
/* XXX: There is no property to read the number of blocks. There
should be a property `#blocks', but it is not there. Perhaps it
is possible to use seek for this. */
disk->total_sectors = GRUB_DISK_SIZE_UNKNOWN;
{
struct ofdisk_hash_ent *op;
op = ofdisk_hash_find (devpath);
if (!op)
op = ofdisk_hash_add (devpath);
else
grub_free (devpath);
if (!op)
return grub_errno;
disk->id = (unsigned long) op;
disk->data = op->devpath;
}
return 0;
}
static void
grub_ofdisk_close (grub_disk_t disk)
{
if (disk->data == last_devpath)
{
if (last_ihandle)
grub_ieee1275_close (last_ihandle);
last_ihandle = 0;
last_devpath = NULL;
}
disk->data = 0;
}
static grub_err_t
grub_ofdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
grub_size_t size, char *buf)
{
grub_ssize_t status, actual;
unsigned long long pos;
if (disk->data != last_devpath)
{
if (last_ihandle)
grub_ieee1275_close (last_ihandle);
last_ihandle = 0;
last_devpath = NULL;
if (! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0))
{
char name2[grub_strlen (disk->data) + 3];
char *p;
grub_strcpy (name2, disk->data);
p = name2 + grub_strlen (name2);
*p++ = ':';
*p++ = '0';
*p = 0;
grub_ieee1275_open (name2, &last_ihandle);
}
else
grub_ieee1275_open (disk->data, &last_ihandle);
if (! last_ihandle)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
last_devpath = disk->data;
}
pos = sector * 512UL;
grub_ieee1275_seek (last_ihandle, pos, &status);
if (status < 0)
return grub_error (GRUB_ERR_READ_ERROR,
"seek error, can't seek block %llu",
(long long) sector);
grub_ieee1275_read (last_ihandle, buf, size * 512UL, &actual);
if (actual != (grub_ssize_t) (size * 512UL))
return grub_error (GRUB_ERR_READ_ERROR, "read error on block: %llu",
(long long) sector);
return 0;
}
static grub_err_t
grub_ofdisk_write (grub_disk_t disk __attribute ((unused)),
grub_disk_addr_t sector __attribute ((unused)),
grub_size_t size __attribute ((unused)),
const char *buf __attribute ((unused)))
{
return GRUB_ERR_NOT_IMPLEMENTED_YET;
}
static struct grub_disk_dev grub_ofdisk_dev =
{
.name = "ofdisk",
.id = GRUB_DISK_DEVICE_OFDISK_ID,
.iterate = grub_ofdisk_iterate,
.open = grub_ofdisk_open,
.close = grub_ofdisk_close,
.read = grub_ofdisk_read,
.write = grub_ofdisk_write,
.next = 0
};
void
grub_ofdisk_init (void)
{
grub_disk_dev_register (&grub_ofdisk_dev);
}
void
grub_ofdisk_fini (void)
{
if (last_ihandle)
grub_ieee1275_close (last_ihandle);
last_ihandle = 0;
last_devpath = NULL;
grub_disk_dev_unregister (&grub_ofdisk_dev);
}
Reference in New Issue View Git Blame Copy Permalink