* Patch by Daniel Engström, 13 Nov 2002:

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

1 files changed, 195 insertions, 0 deletions

diff --git a/fs/fdos/dev.c b/fs/fdos/dev.c
new file mode 100644
index 0000000..f38d07d
--- /dev/null
+++ b/fs/fdos/dev.c
@@ -0,0 +1,195 @@
+/*
+ * (C) Copyright 2002
+ * Stäubli Faverges - <www.staubli.com>
+ * Pierre AUBERT  p.aubert@staubli.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program 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 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <config.h>
+
+#include "dos.h"
+#include "fdos.h"
+
+#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
+
+#define NB_HEADS        2
+#define NB_TRACKS       80
+#define NB_SECTORS      18
+
+
+static int lastwhere;
+
+/*-----------------------------------------------------------------------------
+ * dev_open -- 
+ *-----------------------------------------------------------------------------
+ */
+int dev_open (void)
+{
+    lastwhere = 0;
+    return (0);
+}
+
+/*-----------------------------------------------------------------------------
+ * dev_read -- len and where are sectors number
+ *-----------------------------------------------------------------------------
+ */
+int dev_read (void *buffer, int where, int len)
+{
+    PRINTF ("dev_read (len = %d, where = %d)\n", len, where);
+
+    /* Si on ne desire pas lire a la position courante, il faut un seek      */
+    if (where != lastwhere) {
+        if (!fdc_fdos_seek (where)) {
+            PRINTF ("seek error in dev_read");
+            lastwhere = -1;
+            return (-1);
+        }
+    }
+    
+    if (!fdc_fdos_read (buffer, len)) {
+        PRINTF ("read error\n");
+        lastwhere = -1;
+        return (-1);
+    }
+    lastwhere = where + len;
+    return (0);
+}
+/*-----------------------------------------------------------------------------
+ * check_dev -- verify the diskette format
+ *-----------------------------------------------------------------------------
+ */
+int check_dev (BootSector_t *boot, Fs_t *fs)
+{
+    unsigned int heads, sectors, tracks;
+    int BootP, Infp0, InfpX, InfTm;
+    int sect_per_track;
+
+    /* Display Boot header                                                   */
+    PRINTF ("Jump to boot code                  0x%02x 0x%02x 0x%02x\n",
+            boot -> jump [0], boot -> jump [1], boot -> jump[2]);
+    PRINTF ("OEM name & version                 '%*.*s'\n",
+            BANNER_LG, BANNER_LG, boot -> banner );
+    PRINTF ("Bytes per sector hopefully 512     %d\n",
+            __le16_to_cpu (boot -> secsiz));
+    PRINTF ("Cluster size in sectors            %d\n",
+            boot -> clsiz);
+    PRINTF ("Number of reserved (boot) sectors  %d\n",
+            __le16_to_cpu (boot -> nrsvsect));
+    PRINTF ("Number of FAT tables hopefully 2   %d\n",
+            boot -> nfat);
+    PRINTF ("Number of directory slots          %d\n",
+            __le16_to_cpu (boot -> dirents));
+    PRINTF ("Total sectors on disk              %d\n",
+            __le16_to_cpu (boot -> psect));
+    PRINTF ("Media descriptor=first byte of FAT %d\n",
+            boot -> descr);
+    PRINTF ("Sectors in FAT                     %d\n",
+            __le16_to_cpu (boot -> fatlen));
+    PRINTF ("Sectors/track                      %d\n",
+            __le16_to_cpu (boot -> nsect));
+    PRINTF ("Heads                              %d\n",
+            __le16_to_cpu (boot -> nheads));
+    PRINTF ("number of hidden sectors           %d\n",
+            __le32_to_cpu (boot -> nhs));
+    PRINTF ("big total sectors                  %d\n",
+            __le32_to_cpu (boot -> bigsect));
+    PRINTF ("physical drive ?                   %d\n",
+            boot -> physdrive);
+    PRINTF ("reserved                           %d\n",
+            boot -> reserved);
+    PRINTF ("dos > 4.0 diskette                 %d\n",
+            boot -> dos4);
+    PRINTF ("serial number                      %d\n",
+            __le32_to_cpu (boot -> serial));
+    PRINTF ("disk label                         %*.*s\n",
+            LABEL_LG, LABEL_LG, boot -> label);
+    PRINTF ("FAT type                           %8.8s\n",
+            boot -> fat_type);
+    PRINTF ("reserved by 2M                     %d\n",
+            boot -> res_2m);
+    PRINTF ("2M checksum (not used)             %d\n",
+            boot -> CheckSum);
+    PRINTF ("2MF format version                 %d\n",
+            boot -> fmt_2mf);
+    PRINTF ("1 if write track after format      %d\n",
+            boot -> wt);
+    PRINTF ("data transfer rate on track 0      %d\n",
+            boot -> rate_0);
+    PRINTF ("data transfer rate on track<>0     %d\n",
+            boot -> rate_any);
+    PRINTF ("offset to boot program             %d\n",
+            __le16_to_cpu (boot -> BootP));
+    PRINTF ("T1: information for track 0        %d\n",
+            __le16_to_cpu (boot -> Infp0));
+    PRINTF ("T2: information for track<>0       %d\n",
+            __le16_to_cpu (boot -> InfpX));
+    PRINTF ("T3: track sectors size table       %d\n",
+            __le16_to_cpu (boot -> InfTm));
+    PRINTF ("Format date                        0x%04x\n",
+            __le16_to_cpu (boot -> DateF));
+    PRINTF ("Format time                        0x%04x\n",
+            __le16_to_cpu (boot -> TimeF));
+    
+
+    /* informations are extracted from boot sector                           */
+    heads = __le16_to_cpu (boot -> nheads);
+    sectors = __le16_to_cpu (boot -> nsect);
+    fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
+    if (__le16_to_cpu (boot -> psect) != 0) {
+        fs -> tot_sectors = __le16_to_cpu (boot -> psect);
+    }
+    
+    sect_per_track = heads * sectors;
+    tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;
+    
+    BootP = __le16_to_cpu (boot -> BootP);
+    Infp0 = __le16_to_cpu (boot -> Infp0);
+    InfpX = __le16_to_cpu (boot -> InfpX);
+    InfTm = __le16_to_cpu (boot -> InfTm);
+    
+    if (boot -> dos4 == EXTENDED_BOOT &&
+        strncmp( boot->banner,"2M", 2 ) == 0 &&
+        BootP < SZ_STD_SECTOR &&
+        Infp0 < SZ_STD_SECTOR &&
+        InfpX < SZ_STD_SECTOR &&
+        InfTm < SZ_STD_SECTOR &&
+        BootP >= InfTm + 2 &&
+        InfTm >= InfpX &&
+        InfpX >= Infp0 && 
+        Infp0 >= 76 ) {
+
+        return (-1);
+    }
+
+    if (heads != NB_HEADS ||
+        tracks != NB_TRACKS ||
+        sectors != NB_SECTORS ||
+        __le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
+        fs -> tot_sectors == 0 ||
+        (fs -> tot_sectors % sectors) != 0) {
+        return (-1);
+    }
+    
+    return (0);
+}
+
+
+#endif