From 6dd637f44c0523958012f3c28068c631a73b0569 Mon Sep 17 00:00:00 2001
From: Alan Korr <alkorr@rockbox.org>
Date: Fri, 19 Apr 2002 12:16:19 +0000
Subject: adding files... nothin working... a lot of thing missing

not speaking about possible drastic changes...


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@144 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/test/fat/fat-fsi_sector.h | 80 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 firmware/test/fat/fat-fsi_sector.h

(limited to 'firmware/test/fat/fat-fsi_sector.h')

diff --git a/firmware/test/fat/fat-fsi_sector.h b/firmware/test/fat/fat-fsi_sector.h
new file mode 100644
index 0000000000..c329148bfa
--- /dev/null
+++ b/firmware/test/fat/fat-fsi_sector.h
@@ -0,0 +1,80 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Alan Korr
+ *
+ * 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.
+ *
+ ****************************************************************************/
+#ifndef __LIBRARY_FAT_FSI_SECTOR_H__
+#define __LIBRARY_FAT_FSI_SECTOR_H__
+
+// [Alan]:
+// I would like to draw your attention about the fact that SH1
+// cannot use misaligned address access so you must be very cautious
+// with structures stored in FAT32 partition because they come from
+// PC world where misaligned address accesses are usual and not
+// problematic. To avoid such a trouble, I decide to use special
+// structures where fields are moved in such a way they can be
+// accessed by SH1. It is possible thanks to the callback mechanism
+// I use for reading or writing from/to an ATA device in ata.h/c.
+// So don't be puzzled if those structures seem odd compared
+// with the usual ones from PC world. I use this mechanism for structures
+// 'partition_info', 'mbr_sector' and 'fsi_sector' for instance, but
+// not for structure 'bpb_sector' which is too much complex to handle
+// that way, I think.
+// By the way, SH1 is big endian, not little endian as PC is.
+   
+///////////////////////////////////////////////////////////////////////////////////
+// FSI SECTOR :
+///////////////
+// 
+//
+
+struct __fat_fsi_sector /* File System Info Sector */
+  {
+    unsigned long
+      left_free_clusters;
+    unsigned long
+      next_free_cluster;
+    short
+      data[0];
+    long /* 0x61415252 - aARR */
+      fsi_signature0;
+    char
+      reserved0[480];
+    long /* 0x41617272 - Aarr */
+      fsi_signature1;
+    short
+      end0[0];
+    char
+      reserved1[12];
+    long /* 0x000055AA */
+      signature;
+    short
+      end1[0];
+  };
+
+int __fat_get_fsi_sector_callback (struct __fat_fsi_sector *fsi_sector);
+int __fat_put_fsi_sector_callback (struct __fat_fsi_sector *fsi_sector);
+
+static inline int __fat_get_fsi_sector (unsigned long partition_start,unsigned long lba,struct __fat_fsi_sector *fsi_sector)
+  { return ata_read_sectors (partition_start + lba,1,fsi_sector,(int(*)(void *))get_fsi_sector_callback); } 
+
+static inline int __fat_put_fsi_sector (unsigned long partition_start,unsigned long lba,struct __fat_fsi_sector *fsi_sector)
+  { return ata_write_sectors (partition_start + lba,1,fsi_sector,(int(*)(void *))put_fsi_sector_callback); } 
+
+// 
+///////////////////////////////////////////////////////////////////////////////////
+
+#endif
\ No newline at end of file
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