grub/disk/ieee1275/ofdisk.c
robertmh 2563862970 2008-01-22 Robert Millan <rmh@aybabtu.com>
* disk/ieee1275/ofdisk.c (grub_ofdisk_iterate): When
        `GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY' flag is set, skip any
        device that doesn't look like an SD card.
        * include/grub/ieee1275/ieee1275.h (grub_ieee1275_flag): Add
        `GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY' flag.
        * kern/powerpc/ieee1275/cmain.c (grub_ieee1275_set_flag): Detect
        OLPC laptop, and set `GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY' when
        found.
2008-01-22 20:13:14 +00:00

211 lines
5.6 KiB
C

/* ofdisk.c - Open Firmware disk access. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2004,2006,2007 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 int
grub_ofdisk_iterate (int (*hook) (const char *name))
{
auto int dev_iterate (struct grub_ieee1275_devalias *alias);
int dev_iterate (struct grub_ieee1275_devalias *alias)
{
grub_dprintf ("disk", "disk name = %s\n", alias->name);
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY))
{
grub_ieee1275_phandle_t dev;
char tmp[8];
if (grub_ieee1275_finddevice (alias->path, &dev))
{
grub_dprintf ("disk", "finddevice (%s) failed\n", alias->path);
return 0;
}
if (grub_ieee1275_get_property (dev, "iconname", tmp,
sizeof tmp, 0))
{
grub_dprintf ("disk", "get iconname failed\n");
return 0;
}
if (grub_strcmp (tmp, "sdmmc"))
{
grub_dprintf ("disk", "device is not an SD card\n");
return 0;
}
}
if (! grub_strcmp (alias->type, "block"))
hook (alias->name);
else if ((! grub_strcmp (alias->type, "scsi"))
|| (! grub_strcmp (alias->type, "ide"))
|| (! grub_strcmp (alias->type, "ata")))
/* Search for block-type children of these bus controllers. */
grub_children_iterate (alias->name, dev_iterate);
return 0;
}
grub_devalias_iterate (dev_iterate);
return 0;
}
static grub_err_t
grub_ofdisk_open (const char *name, grub_disk_t disk)
{
grub_ieee1275_phandle_t dev;
grub_ieee1275_ihandle_t dev_ihandle = 0;
char *devpath;
/* XXX: This should be large enough for any possible case. */
char prop[64];
grub_ssize_t actual;
devpath = grub_strndup (name, grub_strlen (name) + 2);
if (! devpath)
return grub_errno;
/* To access the complete disk add `:0'. */
if (! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0))
grub_strcat (devpath, ":0");
grub_dprintf ("disk", "Opening `%s'.\n", devpath);
grub_ieee1275_open (devpath, &dev_ihandle);
if (! dev_ihandle)
{
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Can't open device");
goto fail;
}
grub_dprintf ("disk", "Opened `%s' as handle %p.\n", devpath, (void *) dev_ihandle);
if (grub_ieee1275_finddevice (devpath, &dev))
{
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Can't read device properties");
goto fail;
}
if (grub_ieee1275_get_property (dev, "device_type", prop, sizeof (prop),
&actual))
{
grub_error (GRUB_ERR_BAD_DEVICE, "Can't read the device type");
goto fail;
}
if (grub_strcmp (prop, "block"))
{
grub_error (GRUB_ERR_BAD_DEVICE, "Not a block device");
goto fail;
}
/* 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 = 0xFFFFFFFFUL;
/* XXX: Is it ok to use this? Perhaps it is better to use the path
or some property. */
disk->id = dev;
/* XXX: Read this, somehow. */
disk->has_partitions = 1;
disk->data = (void *) dev_ihandle;
grub_free (devpath);
return 0;
fail:
if (dev_ihandle)
grub_ieee1275_close (dev_ihandle);
grub_free (devpath);
return grub_errno;
}
static void
grub_ofdisk_close (grub_disk_t disk)
{
grub_dprintf ("disk", "Closing handle %p.\n",
(void *) disk->data);
grub_ieee1275_close ((grub_ieee1275_ihandle_t) disk->data);
}
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;
grub_dprintf ("disk",
"Reading handle %p: sector 0x%llx, size 0x%lx, buf %p.\n",
(void *) disk->data, sector, (long) size, buf);
pos = sector * 512UL;
grub_ieee1275_seek ((grub_ieee1275_ihandle_t) disk->data, (int) (pos >> 32),
(int) pos & 0xFFFFFFFFUL, &status);
if (status < 0)
return grub_error (GRUB_ERR_READ_ERROR,
"Seek error, can't seek block %llu",
sector);
grub_ieee1275_read ((grub_ieee1275_ihandle_t) disk->data, buf,
size * 512UL, &actual);
if (actual != actual)
return grub_error (GRUB_ERR_READ_ERROR, "Read error on block: %llu",
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)
{
grub_disk_dev_unregister (&grub_ofdisk_dev);
}