Added disk/partition handling

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@405 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 74 insertions, 0 deletions

diff --git a/firmware/common/disk.c b/firmware/common/disk.c
new file mode 100644
index 0000000000..9572f115e5
--- /dev/null
+++ b/firmware/common/disk.c
@@ -0,0 +1,74 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Björn Stenberg
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "ata.h"
+#include "debug.h"
+#include "disk.h"
+
+/* Partition table entry layout:
+   -----------------------
+   0: 0x80 - active
+   1: starting head
+   2: starting sector
+   3: starting cylinder
+   4: partition type
+   5: end head
+   6: end sector
+   7: end cylinder
+   8-11: starting sector (LBA)
+   12-15: nr of sectors in partition
+*/
+
+#define BYTES2INT32(array,pos) \
+          (array[pos] | (array[pos+1] << 8 ) | \
+          (array[pos+2] << 16 ) | (array[pos+3] << 24 ))
+
+struct partinfo part[8];
+
+int disk_init(void)
+{
+    int i;
+    unsigned char sector[512];
+
+    ata_read_sectors(0,1,&sector);
+
+    /* check that the boot sector is initialized */
+    if ( (sector[510] != 0x55) ||
+         (sector[511] != 0xaa)) {
+        DEBUGF("Bad boot sector signature\n");
+        return -1;
+    }
+
+    /* parse partitions */
+    for ( i=0; i<4; i++ ) {
+        unsigned char* ptr = sector + 0x1be + 16*i;
+        part[i].type  = ptr[4];
+        part[i].start = BYTES2INT32(ptr, 8);
+        part[i].size  = BYTES2INT32(ptr, 12);
+
+        DEBUGF("Part%d: Type %02x, start: %08x size: %08x\n",
+               i,part[i].type,part[i].start,part[i].size);
+
+        /* extended? */
+        if ( part[i].type == 5 ) {
+            /* not handled yet */
+        }
+    }
+
+    return 0;
+}