automake commit without merge history

grub-core/partmap/bsdlabel.c

@@ -0,0 +1,97 @@
+/* bsdlabel.c - Read BSD style partition tables.  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2004,2005,2006,2007,2008,2009  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/partition.h>
+#include <grub/bsdlabel.h>
+#include <grub/disk.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+
+static struct grub_partition_map grub_bsdlabel_partition_map;
+
+
+static grub_err_t
+bsdlabel_partition_map_iterate (grub_disk_t disk,
+				int (*hook) (grub_disk_t disk,
+					     const grub_partition_t partition))
+{
+  struct grub_partition_bsd_disk_label label;
+  struct grub_partition p;
+  grub_disk_addr_t delta = 0;
+  unsigned pos;
+
+  /* BSDLabel offsets are absolute even when it's embed inside partition.  */
+  delta = grub_partition_get_start (disk->partition);
+
+  /* Read the BSD label.  */
+  if (grub_disk_read (disk, GRUB_PC_PARTITION_BSD_LABEL_SECTOR,
+		      0, sizeof (label), &label))
+    return grub_errno;
+
+  /* Check if it is valid.  */
+  if (label.magic != grub_cpu_to_le32 (GRUB_PC_PARTITION_BSD_LABEL_MAGIC))
+    return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
+
+  pos = sizeof (label) + GRUB_PC_PARTITION_BSD_LABEL_SECTOR
+    * GRUB_DISK_SECTOR_SIZE;
+
+  for (p.number = 0;
+       p.number < grub_cpu_to_le16 (label.num_partitions);
+       p.number++)
+    {
+      struct grub_partition_bsd_entry be;
+
+      p.offset = pos / GRUB_DISK_SECTOR_SIZE;
+      p.index = pos % GRUB_DISK_SECTOR_SIZE;
+
+      if (grub_disk_read (disk, p.offset, p.index, sizeof (be),  &be))
+	return grub_errno;
+
+      p.start = grub_le_to_cpu32 (be.offset) - delta;
+      p.len = grub_le_to_cpu32 (be.size);
+      p.partmap = &grub_bsdlabel_partition_map;
+
+      if (be.fs_type != GRUB_PC_PARTITION_BSD_TYPE_UNUSED)
+	if (hook (disk, &p))
+	  return grub_errno;
+
+      pos += sizeof (struct grub_partition_bsd_entry);
+    }
+
+  return GRUB_ERR_NONE;
+}
+
+
+/* Partition map type.  */
+static struct grub_partition_map grub_bsdlabel_partition_map =
+  {
+    .name = "bsd",
+    .iterate = bsdlabel_partition_map_iterate,
+  };
+
+GRUB_MOD_INIT(part_bsd)
+{
+  grub_partition_map_register (&grub_bsdlabel_partition_map);
+}
+
+GRUB_MOD_FINI(part_bsd)
+{
+  grub_partition_map_unregister (&grub_bsdlabel_partition_map);
+}