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BVK Chaitanya
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265d68cd10
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8c41176882
810 changed files with 4980 additions and 2508 deletions
285
grub-core/disk/ieee1275/ofdisk.c
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285
grub-core/disk/ieee1275/ofdisk.c
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/* ofdisk.c - Open Firmware disk access. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2004,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/ieee1275/ieee1275.h>
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#include <grub/ieee1275/ofdisk.h>
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struct ofdisk_hash_ent
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{
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char *devpath;
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struct ofdisk_hash_ent *next;
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};
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#define OFDISK_HASH_SZ 8
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static struct ofdisk_hash_ent *ofdisk_hash[OFDISK_HASH_SZ];
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static int
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ofdisk_hash_fn (const char *devpath)
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{
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int hash = 0;
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while (*devpath)
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hash ^= *devpath++;
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return (hash & (OFDISK_HASH_SZ - 1));
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}
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static struct ofdisk_hash_ent *
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ofdisk_hash_find (const char *devpath)
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{
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struct ofdisk_hash_ent *p = ofdisk_hash[ofdisk_hash_fn(devpath)];
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while (p)
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{
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if (!grub_strcmp (p->devpath, devpath))
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break;
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p = p->next;
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}
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return p;
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}
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static struct ofdisk_hash_ent *
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ofdisk_hash_add (char *devpath)
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{
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struct ofdisk_hash_ent **head = &ofdisk_hash[ofdisk_hash_fn(devpath)];
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struct ofdisk_hash_ent *p = grub_malloc(sizeof (*p));
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if (p)
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{
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p->devpath = devpath;
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p->next = *head;
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*head = p;
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}
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return p;
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}
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static int
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grub_ofdisk_iterate (int (*hook) (const char *name))
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{
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auto int dev_iterate (struct grub_ieee1275_devalias *alias);
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int dev_iterate (struct grub_ieee1275_devalias *alias)
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{
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int ret = 0;
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grub_dprintf ("disk", "disk name = %s\n", alias->name);
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if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_OFDISK_SDCARD_ONLY))
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{
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grub_ieee1275_phandle_t dev;
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char tmp[8];
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if (grub_ieee1275_finddevice (alias->path, &dev))
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{
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grub_dprintf ("disk", "finddevice (%s) failed\n", alias->path);
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return 0;
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}
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if (grub_ieee1275_get_property (dev, "iconname", tmp,
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sizeof tmp, 0))
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{
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grub_dprintf ("disk", "get iconname failed\n");
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return 0;
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}
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if (grub_strcmp (tmp, "sdmmc"))
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{
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grub_dprintf ("disk", "device is not an SD card\n");
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return 0;
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}
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}
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if (! grub_strcmp (alias->type, "block") &&
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grub_strncmp (alias->name, "cdrom", 5))
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ret = hook (alias->name);
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return ret;
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}
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return grub_devalias_iterate (dev_iterate);
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}
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static char *
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compute_dev_path (const char *name)
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{
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char *devpath = grub_malloc (grub_strlen (name) + 3);
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char *p, c;
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if (!devpath)
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return NULL;
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/* Un-escape commas. */
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p = devpath;
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while ((c = *name++) != '\0')
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{
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if (c == '\\' && *name == ',')
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{
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*p++ = ',';
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name++;
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}
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else
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*p++ = c;
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}
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if (! grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PARTITION_0))
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{
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*p++ = ':';
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*p++ = '0';
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}
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*p++ = '\0';
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return devpath;
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}
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static grub_err_t
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grub_ofdisk_open (const char *name, grub_disk_t disk)
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{
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grub_ieee1275_phandle_t dev;
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grub_ieee1275_ihandle_t dev_ihandle = 0;
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struct ofdisk_hash_ent *op;
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char *devpath;
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/* XXX: This should be large enough for any possible case. */
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char prop[64];
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grub_ssize_t actual;
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devpath = compute_dev_path (name);
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if (! devpath)
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return grub_errno;
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op = ofdisk_hash_find (devpath);
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if (!op)
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op = ofdisk_hash_add (devpath);
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grub_free (devpath);
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if (!op)
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return grub_errno;
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grub_dprintf ("disk", "Opening `%s'.\n", op->devpath);
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if (grub_ieee1275_finddevice (op->devpath, &dev))
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{
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grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't read device properties");
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goto fail;
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}
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if (grub_ieee1275_get_property (dev, "device_type", prop, sizeof (prop),
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&actual))
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{
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grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't read the device type");
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goto fail;
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}
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if (grub_strcmp (prop, "block"))
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{
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grub_error (GRUB_ERR_BAD_DEVICE, "not a block device");
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goto fail;
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}
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grub_ieee1275_open (op->devpath, &dev_ihandle);
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if (! dev_ihandle)
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{
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grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
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goto fail;
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}
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grub_dprintf ("disk", "Opened `%s' as handle %p.\n", op->devpath,
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(void *) (unsigned long) dev_ihandle);
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/* XXX: There is no property to read the number of blocks. There
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should be a property `#blocks', but it is not there. Perhaps it
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is possible to use seek for this. */
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disk->total_sectors = 0xFFFFFFFFUL;
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disk->id = (unsigned long) op;
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/* XXX: Read this, somehow. */
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disk->has_partitions = 1;
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disk->data = (void *) (unsigned long) dev_ihandle;
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return 0;
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fail:
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if (dev_ihandle)
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grub_ieee1275_close (dev_ihandle);
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return grub_errno;
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}
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static void
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grub_ofdisk_close (grub_disk_t disk)
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{
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grub_dprintf ("disk", "Closing handle %p.\n",
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(void *) disk->data);
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grub_ieee1275_close ((grub_ieee1275_ihandle_t) (unsigned long) disk->data);
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}
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static grub_err_t
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grub_ofdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
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grub_size_t size, char *buf)
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{
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grub_ssize_t status, actual;
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unsigned long long pos;
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pos = sector * 512UL;
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grub_ieee1275_seek ((grub_ieee1275_ihandle_t) (unsigned long) disk->data,
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pos, &status);
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if (status < 0)
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return grub_error (GRUB_ERR_READ_ERROR,
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"seek error, can't seek block %llu",
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(long long) sector);
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grub_ieee1275_read ((grub_ieee1275_ihandle_t) (unsigned long) disk->data,
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buf, size * 512UL, &actual);
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if (actual != (grub_ssize_t) (size * 512UL))
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return grub_error (GRUB_ERR_READ_ERROR, "read error on block: %llu",
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(long long) sector);
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return 0;
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}
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static grub_err_t
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grub_ofdisk_write (grub_disk_t disk __attribute ((unused)),
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grub_disk_addr_t sector __attribute ((unused)),
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grub_size_t size __attribute ((unused)),
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const char *buf __attribute ((unused)))
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{
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return GRUB_ERR_NOT_IMPLEMENTED_YET;
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}
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static struct grub_disk_dev grub_ofdisk_dev =
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{
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.name = "ofdisk",
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.id = GRUB_DISK_DEVICE_OFDISK_ID,
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.iterate = grub_ofdisk_iterate,
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.open = grub_ofdisk_open,
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.close = grub_ofdisk_close,
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.read = grub_ofdisk_read,
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.write = grub_ofdisk_write,
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.next = 0
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};
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void
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grub_ofdisk_init (void)
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{
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grub_disk_dev_register (&grub_ofdisk_dev);
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}
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void
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grub_ofdisk_fini (void)
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{
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grub_disk_dev_unregister (&grub_ofdisk_dev);
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}
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