source: SVN/cambria/redboot/packages/redboot/current/include/fs/disk.h @ 1

Last change on this file since 1 was 1, checked in by Tim Harvey, 2 years ago

restored latest version of files from server backup

Signed-off-by: Tim Harvey <tharvey@…>

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1//==========================================================================
2//
3//      disk.h
4//
5//      Stand-alone disk support for RedBoot
6//
7//==========================================================================
8//####ECOSGPLCOPYRIGHTBEGIN####
9// -------------------------------------------
10// This file is part of eCos, the Embedded Configurable Operating System.
11// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12//
13// eCos is free software; you can redistribute it and/or modify it under
14// the terms of the GNU General Public License as published by the Free
15// Software Foundation; either version 2 or (at your option) any later version.
16//
17// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18// WARRANTY; without even the implied warranty of MERCHANTABILITY or
19// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20// for more details.
21//
22// You should have received a copy of the GNU General Public License along
23// with eCos; if not, write to the Free Software Foundation, Inc.,
24// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25//
26// As a special exception, if other files instantiate templates or use macros
27// or inline functions from this file, or you compile this file and link it
28// with other works to produce a work based on this file, this file does not
29// by itself cause the resulting work to be covered by the GNU General Public
30// License. However the source code for this file must still be made available
31// in accordance with section (3) of the GNU General Public License.
32//
33// This exception does not invalidate any other reasons why a work based on
34// this file might be covered by the GNU General Public License.
35//
36// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37// at http://sources.redhat.com/ecos/ecos-license/
38// -------------------------------------------
39//####ECOSGPLCOPYRIGHTEND####
40//==========================================================================
41//#####DESCRIPTIONBEGIN####
42//
43// Author(s):    msalter
44// Contributors: msalter
45// Date:         2001-07-02
46// Purpose:     
47// Description: 
48//             
49// This code is part of RedBoot (tm).
50//
51//####DESCRIPTIONEND####
52//
53//==========================================================================
54
55#ifndef CYGONCE_REDBOOT_DISK_H
56#define CYGONCE_REDBOOT_DISK_H
57
58#define SECTOR_SIZE 512
59
60// Convenience macros to access disk/filesystem info which may
61// be stored in a fixed endian format.
62
63#define __SWAB16(x) \
64    ((((x) & 0xFF) << 8) | (((x) >> 8) & 0xFF))
65
66#define __SWAB32(x)         \
67   ((((x) & 0xff) << 24)   |  \
68    (((x) & 0xff00) <<  8) |  \
69    (((x) >> 8) & 0xff00)  |  \
70    (((x) >> 24) & 0xff))
71
72#if (CYG_BYTEORDER == CYG_MSBFIRST)
73#define SWAB_LE16(x) __SWAB16(x)
74#define SWAB_LE32(x) __SWAB32(x)
75#define SWAB_BE16(x) (x)
76#define SWAB_BE32(x) (x)
77#else
78#define SWAB_LE16(x) (x)
79#define SWAB_LE32(x) (x)
80#define SWAB_BE16(x) __SWAB16(x)
81#define SWAB_BE32(x) __SWAB32(x)
82#endif
83
84struct partition;
85
86// filesystem interface
87typedef struct fs_funs {
88    // Load a file into memory.
89    void * (*open)(struct partition *p, const char *path);
90    int    (*read)(void *fp, char *buf, cyg_uint32 nbytes);
91} fs_funs_t;
92
93struct disk;
94
95typedef struct partition {
96    struct disk *disk;
97    fs_funs_t   *funs;
98    cyg_uint32  start_sector;   // first sector in partition
99    cyg_uint32  nr_sectors;     // number of sectors in partition
100    cyg_uint8   systype;        // FAT12, FAT16, Linux, etc.
101    cyg_uint8   bootflag;       // not really used...
102} partition_t;
103
104// System types
105#define SYSTYPE_FAT12        0x01
106#define SYSTYPE_FAT16_32M    0x04
107#define SYSTYPE_EXTENDED     0x05
108#define SYSTYPE_FAT16        0x06
109#define SYSTYPE_LINUX_SWAP   0x82
110#define SYSTYPE_LINUX        0x83
111
112typedef struct disk_funs {
113    int  (*read)(struct disk *d,
114                 cyg_uint32  start_sector,
115                 cyg_uint32  *buf,
116                 cyg_uint8   nr_sectors);
117} disk_funs_t;
118
119
120typedef struct disk {
121    disk_funs_t *funs;          // Disk driver functions
122    void        *private;       // Whatever is needed by disk functions
123    cyg_uint32  nr_sectors;     // Total disk size in sectors
124    short       kind;           // IDE_HD, IDE_CDROM, SCSI_HD, etc
125    short       index;          // index within specific kind
126    partition_t partitions[CYGNUM_REDBOOT_MAX_PARTITIONS];
127} disk_t;
128
129#define DISK_READ(d,s,p,n) ((d)->funs->read)((d),(s),(p),(n))
130#define PARTITION_READ(part,s,p,n) \
131    DISK_READ((part)->disk, (s) + (part)->start_sector, (p), (n))
132
133// Kinds of disks
134#define DISK_IDE_HD     1
135#define DISK_IDE_CDROM  2
136#define DISK_FLOPPY     3
137
138// DOS partition table as laid out in the MBR
139//
140struct mbr_partition {
141    cyg_uint8  boot_ind;        // 0x80 == active
142    cyg_uint8  head;
143    cyg_uint8  sector;
144    cyg_uint8  cyl;
145    cyg_uint8  sys_ind;         // partition type
146    cyg_uint8  end_head;
147    cyg_uint8  end_sector;
148    cyg_uint8  end_cyl;
149    cyg_uint8  start_sect[4];   // starting sector counting from 0
150    cyg_uint8  nr_sects[4];     // number of sectors in partition
151};
152
153#define MBR_PTABLE_OFFSET 0x1be
154#define MBR_MAGIC_OFFSET  0x1fe
155#define MBR_MAGIC         0xaa55
156
157// Add a disk to the disk table.
158// Return zero if no more room in table.
159//
160externC int disk_register(disk_t *disk);
161
162
163#define diskerr_badname   -1
164#define diskerr_partition -2
165#define diskerr_open      -3
166#define diskerr_read      -4
167
168externC int   disk_stream_open(connection_info_t *info, int *err);   
169externC void  disk_stream_close(int *err);   
170externC int   disk_stream_read(char *buf, int size, int *err);   
171externC char *disk_error(int err);
172
173#endif // CYGONCE_REDBOOT_DISK_H
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