Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / block / partitions / mac.c

diff --git a/kernel/block/partitions/mac.c b/kernel/block/partitions/mac.c
new file mode 100644 (file)
index 0000000..c2c48ec
--- /dev/null
+++ b/kernel/block/partitions/mac.c
@@ -0,0 +1,138 @@
+/*
+ *  fs/partitions/mac.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/ctype.h>
+#include "check.h"
+#include "mac.h"
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+extern void note_bootable_part(dev_t dev, int part, int goodness);
+#endif
+
+/*
+ * Code to understand MacOS partition tables.
+ */
+
+static inline void mac_fix_string(char *stg, int len)
+{
+       int i;
+
+       for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
+               stg[i] = 0;
+}
+
+int mac_partition(struct parsed_partitions *state)
+{
+       Sector sect;
+       unsigned char *data;
+       int slot, blocks_in_map;
+       unsigned secsize;
+#ifdef CONFIG_PPC_PMAC
+       int found_root = 0;
+       int found_root_goodness = 0;
+#endif
+       struct mac_partition *part;
+       struct mac_driver_desc *md;
+
+       /* Get 0th block and look at the first partition map entry. */
+       md = read_part_sector(state, 0, &sect);
+       if (!md)
+               return -1;
+       if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
+               put_dev_sector(sect);
+               return 0;
+       }
+       secsize = be16_to_cpu(md->block_size);
+       put_dev_sector(sect);
+       data = read_part_sector(state, secsize/512, &sect);
+       if (!data)
+               return -1;
+       part = (struct mac_partition *) (data + secsize%512);
+       if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
+               put_dev_sector(sect);
+               return 0;               /* not a MacOS disk */
+       }
+       blocks_in_map = be32_to_cpu(part->map_count);
+       if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
+               put_dev_sector(sect);
+               return 0;
+       }
+
+       if (blocks_in_map >= state->limit)
+               blocks_in_map = state->limit - 1;
+
+       strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
+       for (slot = 1; slot <= blocks_in_map; ++slot) {
+               int pos = slot * secsize;
+               put_dev_sector(sect);
+               data = read_part_sector(state, pos/512, &sect);
+               if (!data)
+                       return -1;
+               part = (struct mac_partition *) (data + pos%512);
+               if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
+                       break;
+               put_partition(state, slot,
+                       be32_to_cpu(part->start_block) * (secsize/512),
+                       be32_to_cpu(part->block_count) * (secsize/512));
+
+               if (!strncasecmp(part->type, "Linux_RAID", 10))
+                       state->parts[slot].flags = ADDPART_FLAG_RAID;
+#ifdef CONFIG_PPC_PMAC
+               /*
+                * If this is the first bootable partition, tell the
+                * setup code, in case it wants to make this the root.
+                */
+               if (machine_is(powermac)) {
+                       int goodness = 0;
+
+                       mac_fix_string(part->processor, 16);
+                       mac_fix_string(part->name, 32);
+                       mac_fix_string(part->type, 32);                                 
+                   
+                       if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
+                           && strcasecmp(part->processor, "powerpc") == 0)
+                               goodness++;
+
+                       if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
+                           || (strncasecmp(part->type, "Linux", 5) == 0
+                               && strcasecmp(part->type, "Linux_swap") != 0)) {
+                               int i, l;
+
+                               goodness++;
+                               l = strlen(part->name);
+                               if (strcmp(part->name, "/") == 0)
+                                       goodness++;
+                               for (i = 0; i <= l - 4; ++i) {
+                                       if (strncasecmp(part->name + i, "root",
+                                                    4) == 0) {
+                                               goodness += 2;
+                                               break;
+                                       }
+                               }
+                               if (strncasecmp(part->name, "swap", 4) == 0)
+                                       goodness--;
+                       }
+
+                       if (goodness > found_root_goodness) {
+                               found_root = slot;
+                               found_root_goodness = goodness;
+                       }
+               }
+#endif /* CONFIG_PPC_PMAC */
+       }
+#ifdef CONFIG_PPC_PMAC
+       if (found_root_goodness)
+               note_bootable_part(state->bdev->bd_dev, found_root,
+                                  found_root_goodness);
+#endif
+
+       put_dev_sector(sect);
+       strlcat(state->pp_buf, "\n", PAGE_SIZE);
+       return 1;
+}