1 files changed, 149 insertions, 0 deletions

diff --git a/fs/partitions/atari.c b/fs/partitions/atari.c
new file mode 100644
index 000000000000..192a6adfdefd
--- /dev/null
+++ b/fs/partitions/atari.c
@@ -0,0 +1,149 @@
+/*
+ *  fs/partitions/atari.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 "atari.h"
+
+/* ++guenther: this should be settable by the user ("make config")?.
+ */
+#define ICD_PARTS
+
+/* check if a partition entry looks valid -- Atari format is assumed if at
+   least one of the primary entries is ok this way */
+#define VALID_PARTITION(pi,hdsiz)                                            \
+    (((pi)->flg & 1) &&                                                      \
+     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
+     be32_to_cpu((pi)->st) <= (hdsiz) &&                                     \
+     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
+
+static inline int OK_id(char *s)
+{
+        return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
+                memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
+                memcmp (s, "RAW", 3) == 0 ;
+}
+
+int atari_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+        Sector sect;
+        struct rootsector *rs;
+        struct partition_info *pi;
+        u32 extensect;
+        u32 hd_size;
+        int slot;
+#ifdef ICD_PARTS
+        int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
+#endif
+
+        rs = (struct rootsector *) read_dev_sector(bdev, 0, &sect);
+        if (!rs)
+                return -1;
+
+        /* Verify this is an Atari rootsector: */
+        hd_size = bdev->bd_inode->i_size >> 9;
+        if (!VALID_PARTITION(&rs->part[0], hd_size) &&
+            !VALID_PARTITION(&rs->part[1], hd_size) &&
+            !VALID_PARTITION(&rs->part[2], hd_size) &&
+            !VALID_PARTITION(&rs->part[3], hd_size)) {
+                /*
+                 * if there's no valid primary partition, assume that no Atari
+                 * format partition table (there's no reliable magic or the like
+                 * :-()
+                 */
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        pi = &rs->part[0];
+        printk (" AHDI");
+        for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
+                struct rootsector *xrs;
+                Sector sect2;
+                ulong partsect;
+
+                if ( !(pi->flg & 1) )
+                        continue;
+                /* active partition */
+                if (memcmp (pi->id, "XGM", 3) != 0) {
+                        /* we don't care about other id's */
+                        put_partition (state, slot, be32_to_cpu(pi->st),
+                                        be32_to_cpu(pi->siz));
+                        continue;
+                }
+                /* extension partition */
+#ifdef ICD_PARTS
+                part_fmt = 1;
+#endif
+                printk(" XGM<");
+                partsect = extensect = be32_to_cpu(pi->st);
+                while (1) {
+                        xrs = (struct rootsector *)read_dev_sector(bdev, partsect, &sect2);
+                        if (!xrs) {
+                                printk (" block %ld read failed\n", partsect);
+                                put_dev_sector(sect);
+                                return 0;
+                        }
+
+                        /* ++roman: sanity check: bit 0 of flg field must be set */
+                        if (!(xrs->part[0].flg & 1)) {
+                                printk( "\nFirst sub-partition in extended partition is not valid!\n" );
+                                put_dev_sector(sect2);
+                                break;
+                        }
+
+                        put_partition(state, slot,
+                                   partsect + be32_to_cpu(xrs->part[0].st),
+                                   be32_to_cpu(xrs->part[0].siz));
+
+                        if (!(xrs->part[1].flg & 1)) {
+                                /* end of linked partition list */
+                                put_dev_sector(sect2);
+                                break;
+                        }
+                        if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
+                                printk("\nID of extended partition is not XGM!\n");
+                                put_dev_sector(sect2);
+                                break;
+                        }
+
+                        partsect = be32_to_cpu(xrs->part[1].st) + extensect;
+                        put_dev_sector(sect2);
+                        if (++slot == state->limit) {
+                                printk( "\nMaximum number of partitions reached!\n" );
+                                break;
+                        }
+                }
+                printk(" >");
+        }
+#ifdef ICD_PARTS
+        if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
+                pi = &rs->icdpart[0];
+                /* sanity check: no ICD format if first partition invalid */
+                if (OK_id(pi->id)) {
+                        printk(" ICD<");
+                        for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
+                                /* accept only GEM,BGM,RAW,LNX,SWP partitions */
+                                if (!((pi->flg & 1) && OK_id(pi->id)))
+                                        continue;
+                                part_fmt = 2;
+                                put_partition (state, slot,
+                                                be32_to_cpu(pi->st),
+                                                be32_to_cpu(pi->siz));
+                        }
+                        printk(" >");
+                }
+        }
+#endif
+        put_dev_sector(sect);
+
+        printk ("\n");
+
+        return 1;
+}