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-rw-r--r--grub-core/disk/ieee1275/ofdisk.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/grub-core/disk/ieee1275/ofdisk.c b/grub-core/disk/ieee1275/ofdisk.c
new file mode 100644
index 0000000..0a935d5
--- /dev/null
+++ b/grub-core/disk/ieee1275/ofdisk.c
@@ -0,0 +1,373 @@
+/* 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_real (char *devpath)
+{
+ struct ofdisk_hash_ent *p;
+ struct ofdisk_hash_ent **head = &ofdisk_hash[ofdisk_hash_fn(devpath)];
+
+ p = grub_malloc(sizeof (*p));
+ if (!p)
+ return NULL;
+
+ p->devpath = devpath;
+ p->next = *head;
+ p->shortest = 0;
+ *head = p;
+ return p;
+}
+
+static struct ofdisk_hash_ent *
+ofdisk_hash_add (char *devpath, char *curcan)
+{
+ struct ofdisk_hash_ent *p, *pcan;
+
+ p = ofdisk_hash_add_real (devpath);
+
+ grub_dprintf ("disk", "devpath = %s, canonical = %s\n", devpath, curcan);
+
+ if (!curcan)
+ {
+ p->shortest = devpath;
+ return p;
+ }
+
+ pcan = ofdisk_hash_find (curcan);
+ if (!pcan)
+ pcan = ofdisk_hash_add_real (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);
+ grub_dprintf ("disk", "disk name = %s, path = %s\n", alias->name,
+ alias->path);
+
+ op = ofdisk_hash_find (alias->name);
+ if (!op)
+ {
+ char *name = grub_strdup (alias->name);
+ char *can = grub_strdup (alias->path);
+ if (!name || !can)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ grub_free (name);
+ grub_free (can);
+ return 0;
+ }
+ op = ofdisk_hash_add (name, can);
+ }
+ 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, NULL);
+ 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);
+}
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