1 files changed, 127 insertions, 0 deletions
diff --git a/grub-core/partmap/dvh.c b/grub-core/partmap/dvh.c
new file mode 100644
index 0000000..95c9618
--- /dev/null
+++ b/grub-core/partmap/dvh.c
@@ -0,0 +1,127 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2005,2006,2007,2011  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/disk.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+#include <grub/symbol.h>
+#include <grub/types.h>
+#include <grub/err.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define DVH_MAGIC 0x0be5a941
+
+struct grub_dvh_partition_descriptor
+{
+  grub_uint32_t length;
+  grub_uint32_t start;
+  grub_uint32_t type;  
+} GRUB_PACKED;
+
+struct grub_dvh_block
+{
+  grub_uint32_t magic;
+  grub_uint8_t unused[308];
+  struct grub_dvh_partition_descriptor parts[16];
+  grub_uint32_t checksum;
+  grub_uint32_t unused2;
+} GRUB_PACKED;
+
+static struct grub_partition_map grub_dvh_partition_map;
+
+/* Verify checksum (true=ok).  */
+static int
+grub_dvh_is_valid (grub_uint32_t *label)
+{
+  grub_uint32_t *pos;
+  grub_uint32_t sum = 0;
+
+  for (pos = label;
+       pos < (label + sizeof (struct grub_dvh_block) / 4);
+       pos++)
+    sum += grub_be_to_cpu32 (*pos);
+
+  return ! sum;
+}
+
+static grub_err_t
+dvh_partition_map_iterate (grub_disk_t disk,
+			   grub_partition_iterate_hook_t hook, void *hook_data)
+{
+  struct grub_partition p;
+  union
+  {
+    struct grub_dvh_block dvh;
+    grub_uint32_t raw[0];
+  } block;
+  unsigned partnum;
+  grub_err_t err;
+
+  p.partmap = &grub_dvh_partition_map;
+  err = grub_disk_read (disk, 0, 0, sizeof (struct grub_dvh_block),
+			&block);
+  if (err)
+    return err;
+
+  if (DVH_MAGIC != grub_be_to_cpu32 (block.dvh.magic))
+    return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a dvh partition table");
+
+  if (! grub_dvh_is_valid (block.raw))
+      return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
+  
+  /* Maybe another error value would be better, because partition
+     table _is_ recognized but invalid.  */
+  for (partnum = 0; partnum < ARRAY_SIZE (block.dvh.parts); partnum++)
+    {
+      if (block.dvh.parts[partnum].length == 0)
+	continue;
+
+      if (partnum == 10)
+	continue;
+
+      p.start = grub_be_to_cpu32 (block.dvh.parts[partnum].start);
+      p.len = grub_be_to_cpu32 (block.dvh.parts[partnum].length);
+      p.number = p.index = partnum;
+      if (hook (disk, &p, hook_data))
+	break;
+    }
+
+  return grub_errno;
+}
+
+
+/* Partition map type.  */
+static struct grub_partition_map grub_dvh_partition_map =
+  {
+    .name = "dvh",
+    .iterate = dvh_partition_map_iterate,
+  };
+
+GRUB_MOD_INIT(part_dvh)
+{
+  grub_partition_map_register (&grub_dvh_partition_map);
+}
+
+GRUB_MOD_FINI(part_dvh)
+{
+  grub_partition_map_unregister (&grub_dvh_partition_map);
+}
+