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//==========================================================================

//

//      disk.h

//

//      Stand-alone disk support for RedBoot

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos 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 or (at your option) any later      

// version.                                                                 

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

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// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

// -------------------------------------------                              

// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: msalter

// Date:         2001-07-02

// Purpose:      

// Description:  

//              

// This code is part of RedBoot (tm).

//

//####DESCRIPTIONEND####

//

//==========================================================================

#ifndef CYGONCE_REDBOOT_DISK_H

#define CYGONCE_REDBOOT_DISK_H

#define SECTOR_SIZE 512

// Convenience macros to access disk/filesystem info which may

// be stored in a fixed endian format.

#define __SWAB16(x) \

    ((((x) & 0xFF) << 8) | (((x) >> 8) & 0xFF))

#define __SWAB32(x)         \

   ((((x) & 0xff) << 24)   |  \

    (((x) & 0xff00) <<  8) |  \

    (((x) >> 8) & 0xff00)  |  \

    (((x) >> 24) & 0xff))

#if (CYG_BYTEORDER == CYG_MSBFIRST)

#define SWAB_LE16(x) __SWAB16(x)

#define SWAB_LE32(x) __SWAB32(x)

#define SWAB_BE16(x) (x)

#define SWAB_BE32(x) (x)

#else

#define SWAB_LE16(x) (x)

#define SWAB_LE32(x) (x)

#define SWAB_BE16(x) __SWAB16(x)

#define SWAB_BE32(x) __SWAB32(x)

#endif

struct partition;

// filesystem interface

typedef struct fs_funs {

    // Load a file into memory.

    void * (*open)(struct partition *p, const char *path);

    int    (*read)(void *fp, char *buf, cyg_uint32 nbytes);

} fs_funs_t;

struct disk;

typedef struct partition {

    struct disk *disk;

    fs_funs_t   *funs;

    cyg_uint32  start_sector;   // first sector in partition

    cyg_uint32  nr_sectors;     // number of sectors in partition

    cyg_uint8   systype;        // FAT12, FAT16, Linux, etc.

    cyg_uint8   bootflag;       // not really used...

} partition_t;

// System types

#define SYSTYPE_FAT12        0x01

#define SYSTYPE_FAT16_32M    0x04

#define SYSTYPE_EXTENDED     0x05

#define SYSTYPE_FAT16        0x06

#define SYSTYPE_LINUX_SWAP   0x82

#define SYSTYPE_LINUX        0x83

typedef struct disk_funs {

    int  (*read)(struct disk *d,

                 cyg_uint32  start_sector,

                 cyg_uint32  *buf,

                 cyg_uint8   nr_sectors);

} disk_funs_t;

typedef struct disk {

    disk_funs_t *funs;          // Disk driver functions

    void        *private;       // Whatever is needed by disk functions

    cyg_uint32  nr_sectors;     // Total disk size in sectors

    short       kind;           // IDE_HD, IDE_CDROM, SCSI_HD, etc

    short       index;          // index within specific kind

    partition_t partitions[CYGNUM_REDBOOT_MAX_PARTITIONS];

} disk_t;

#define DISK_READ(d,s,p,n) ((d)->funs->read)((d),(s),(p),(n))

#define PARTITION_READ(part,s,p,n) \

    DISK_READ((part)->disk, (s) + (part)->start_sector, (p), (n))

// Kinds of disks

#define DISK_IDE_HD     1

#define DISK_IDE_CDROM  2

#define DISK_FLOPPY     3

// DOS partition table as laid out in the MBR

//

struct mbr_partition {

    cyg_uint8  boot_ind;        // 0x80 == active

    cyg_uint8  head;

    cyg_uint8  sector;

    cyg_uint8  cyl;

    cyg_uint8  sys_ind;         // partition type

    cyg_uint8  end_head;

    cyg_uint8  end_sector;

    cyg_uint8  end_cyl;

    cyg_uint8  start_sect[4];   // starting sector counting from 0

    cyg_uint8  nr_sects[4];     // number of sectors in partition

};

#define MBR_PTABLE_OFFSET 0x1be

#define MBR_MAGIC_OFFSET  0x1fe

#define MBR_MAGIC         0xaa55

// Add a disk to the disk table.

// Return zero if no more room in table.

//

externC int disk_register(disk_t *disk);

#define diskerr_badname   -1

#define diskerr_partition -2

#define diskerr_open      -3

#define diskerr_read      -4

externC int   disk_stream_open(connection_info_t *info, int *err);

externC void  disk_stream_close(int *err);

externC int   disk_stream_read(char *buf, int size, int *err);

externC char *disk_error(int err);

#endif // CYGONCE_REDBOOT_DISK_H