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-rw-r--r--grub-core/partmap/amiga.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/grub-core/partmap/amiga.c b/grub-core/partmap/amiga.c
new file mode 100644
index 0000000..13034f1
--- /dev/null
+++ b/grub-core/partmap/amiga.c
@@ -0,0 +1,183 @@
+/* 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>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define AMIGA_CHECKSUM_WORDS 128
+
+struct grub_amiga_rdsk
+{
+ /* "RDSK". */
+ grub_uint8_t magic[4];
+#define GRUB_AMIGA_RDSK_MAGIC "RDSK"
+ 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;
+
+ grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 9];
+} GRUB_PACKED;
+
+struct grub_amiga_partition
+{
+ /* "PART". */
+ grub_uint8_t magic[4];
+#define GRUB_AMIGA_PART_MAGIC "PART"
+ grub_uint32_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;
+ grub_uint32_t unused[AMIGA_CHECKSUM_WORDS - 44];
+} GRUB_PACKED;
+
+static struct grub_partition_map grub_amiga_partition_map;
+
+
+
+static grub_uint32_t
+amiga_partition_map_checksum (void *buf)
+{
+ grub_uint32_t *ptr = buf;
+ grub_uint32_t r = 0;
+ grub_size_t sz;
+ /* Fancy and quick way of checking sz >= 512 / 4 = 128. */
+ if (ptr[1] & ~grub_cpu_to_be32_compile_time (AMIGA_CHECKSUM_WORDS - 1))
+ sz = AMIGA_CHECKSUM_WORDS;
+ else
+ sz = grub_be_to_cpu32 (ptr[1]);
+
+ for (; sz; sz--, ptr++)
+ r += grub_be_to_cpu32 (*ptr);
+
+ return r;
+}
+
+static grub_err_t
+amiga_partition_map_iterate (grub_disk_t disk,
+ grub_partition_iterate_hook_t hook,
+ void *hook_data)
+{
+ 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_memcmp (rdsk.magic, GRUB_AMIGA_RDSK_MAGIC,
+ sizeof (rdsk.magic)) == 0
+ && amiga_partition_map_checksum (&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;
+
+ if (grub_memcmp (apart.magic, GRUB_AMIGA_PART_MAGIC,
+ sizeof (apart.magic)) != 0
+ || amiga_partition_map_checksum (&apart) != 0)
+ return grub_error (GRUB_ERR_BAD_PART_TABLE,
+ "invalid Amiga partition map");
+ /* 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 = next;
+ part.number = partno;
+ part.index = 0;
+ part.partmap = &grub_amiga_partition_map;
+
+ if (hook (disk, &part, hook_data))
+ 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);
+}