automake commit without merge history

grub-core/partmap/amiga.c

@@ -0,0 +1,151 @@
+/* amiga.c - Read amiga partition tables (RDB).  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2004,2005,2006,2007  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/disk.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/partition.h>
+#include <grub/dl.h>
+
+struct grub_amiga_rdsk
+{
+  /* "RDSK".  */
+  grub_uint8_t magic[4];
+  grub_uint32_t size;
+  grub_int32_t checksum;
+  grub_uint32_t scsihost;
+  grub_uint32_t blksz;
+  grub_uint32_t flags;
+  grub_uint32_t badblcklst;
+  grub_uint32_t partitionlst;
+  grub_uint32_t fslst;
+
+  /* The other information is not important for us.  */
+} __attribute__ ((packed));
+
+struct grub_amiga_partition
+{
+  /* "PART".  */
+  grub_uint8_t magic[4];
+  grub_int32_t size;
+  grub_int32_t checksum;
+  grub_uint32_t scsihost;
+  grub_uint32_t next;
+  grub_uint32_t flags;
+  grub_uint32_t unused1[2];
+  grub_uint32_t devflags;
+  grub_uint8_t namelen;
+  grub_uint8_t name[31];
+  grub_uint32_t unused2[15];
+
+  grub_uint32_t unused3[3];
+  grub_uint32_t heads;
+  grub_uint32_t unused4;
+  grub_uint32_t block_per_track;
+  grub_uint32_t unused5[3];
+  grub_uint32_t lowcyl;
+  grub_uint32_t highcyl;
+
+  grub_uint32_t firstcyl;
+} __attribute__ ((packed));
+
+static struct grub_partition_map grub_amiga_partition_map;
+
+
+
+static grub_err_t
+amiga_partition_map_iterate (grub_disk_t disk,
+			     int (*hook) (grub_disk_t disk,
+					  const grub_partition_t partition))
+{
+  struct grub_partition part;
+  struct grub_amiga_rdsk rdsk;
+  int partno = 0;
+  int next = -1;
+  unsigned pos;
+
+  /* The RDSK block is one of the first 15 blocks.  */
+  for (pos = 0; pos < 15; pos++)
+    {
+      /* Read the RDSK block which is a descriptor for the entire disk.  */
+      if (grub_disk_read (disk, pos, 0, sizeof (rdsk), &rdsk))
+	return grub_errno;
+
+      if (grub_strcmp ((char *) rdsk.magic, "RDSK") == 0)
+	{
+	  /* Found the first PART block.  */
+	  next = grub_be_to_cpu32 (rdsk.partitionlst);
+	  break;
+	}
+    }
+
+  if (next == -1)
+    return grub_error (GRUB_ERR_BAD_PART_TABLE,
+		       "Amiga partition map not found");
+
+  /* The end of the partition list is marked using "-1".  */
+  while (next != -1)
+    {
+      struct grub_amiga_partition apart;
+
+      /* Read the RDSK block which is a descriptor for the entire disk.  */
+      if (grub_disk_read (disk, next, 0, sizeof (apart), &apart))
+	return grub_errno;
+
+      /* Calculate the first block and the size of the partition.  */
+      part.start = (grub_be_to_cpu32 (apart.lowcyl)
+		    * grub_be_to_cpu32 (apart.heads)
+		    * grub_be_to_cpu32 (apart.block_per_track));
+      part.len = ((grub_be_to_cpu32 (apart.highcyl)
+		   - grub_be_to_cpu32 (apart.lowcyl) + 1)
+		  * grub_be_to_cpu32 (apart.heads)
+		  * grub_be_to_cpu32 (apart.block_per_track));
+
+      part.offset = (grub_off_t) next * 512;
+      part.number = partno;
+      part.index = 0;
+      part.partmap = &grub_amiga_partition_map;
+
+      if (hook (disk, &part))
+	return grub_errno;
+
+      next = grub_be_to_cpu32 (apart.next);
+      partno++;
+    }
+
+  return 0;
+}
+
+
+/* Partition map type.  */
+static struct grub_partition_map grub_amiga_partition_map =
+  {
+    .name = "amiga",
+    .iterate = amiga_partition_map_iterate,
+  };
+
+GRUB_MOD_INIT(part_amiga)
+{
+  grub_partition_map_register (&grub_amiga_partition_map);
+}
+
+GRUB_MOD_FINI(part_amiga)
+{
+  grub_partition_map_unregister (&grub_amiga_partition_map);
+}