Subversion Repositories HelenOS

/*
 * Copyright (c) 2007 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup fs
 * @{
 */ 

#ifndef FAT_FAT_H_
#define FAT_FAT_H_

#include <ipc/ipc.h>
#include <libfs.h>
#include <atomic.h>
#include <sys/types.h>
#include <bool.h>

#define dprintf(...)    printf(__VA_ARGS__)

typedef struct {
    uint8_t     ji[3];      /**< Jump instruction. */
    uint8_t     oem_name[8];
    /* BIOS Parameter Block */
    uint16_t    bps;        /**< Bytes per sector. */
    uint8_t     spc;        /**< Sectors per cluster. */
    uint16_t    rsc;        /**< Reserved sector count. */
    uint8_t     fatcnt;     /**< Number of FATs. */
    uint16_t    root_ent_max;   /**< Maximum number of root directory
                         entries. */
    uint16_t    totsec;     /**< Total sectors. */
    uint8_t     mdesc;      /**< Media descriptor. */
    uint16_t    sec_per_fat;    /**< Sectors per FAT12/FAT16. */
    uint16_t    sec_per_track;  /**< Sectors per track. */
    uint16_t    headcnt;    /**< Number of heads. */
    uint32_t    hidden_sec; /**< Hidden sectors. */
    uint32_t    total_sec;  /**< Total sectors. */

    union {
        struct {
            /* FAT12/FAT16 only: Extended BIOS Parameter Block */
            /** Physical drive number. */
            uint8_t     pdn;
            uint8_t     reserved;
            /** Extended boot signature. */
            uint8_t     ebs;
            /** Serial number. */
            uint32_t    id;
            /** Volume label. */
            uint8_t     label[11];
            /** FAT type. */
            uint8_t     type[8];
            /** Boot code. */
            uint8_t     boot_code[448];
            /** Boot sector signature. */
            uint16_t    signature;
        } __attribute__ ((packed));
        struct {
            /* FAT32 only */
            /** Sectors per FAT. */
            uint32_t    sectors_per_fat;
            /** FAT flags. */
            uint16_t    flags;
            /** Version. */
            uint16_t    version;
            /** Cluster number of root directory. */
            uint32_t    root_cluster;
            /** Sector number of file system information sector. */
            uint16_t    fsinfo_sec;
            /** Sector number of boot sector copy. */
            uint16_t    bscopy_sec;
            uint8_t     reserved1[12];
            /** Physical drive number. */
            uint8_t     pdn;
            uint8_t     reserved2;
            /** Extended boot signature. */
            uint8_t     ebs;
            /** Serial number. */
            uint32_t    id;
            /** Volume label. */
            uint8_t     label;
            /** FAT type. */
            uint8_t     type[8];
            /** Boot code. */
            uint8_t     boot_code[420];
            /** Signature. */
            uint16_t    signature;
        } __attribute__ ((packed));
    }; 
} __attribute__ ((packed)) fat_bs_t;

typedef struct {
    uint8_t     name[8];
    uint8_t     ext[3];
    uint8_t     attr;
    uint8_t     reserved;
    uint8_t     ctime_fine;
    uint16_t    ctime;
    uint16_t    cdate;
    uint16_t    adate;
    union {
        uint16_t    eaidx;      /* FAT12/FAT16 */
        uint16_t    firstc_hi;  /* FAT32 */
    };
    uint16_t    mtime;
    uint16_t    mdate;
    union {
        uint16_t    firstc;     /* FAT12/FAT16 */
        uint16_t    firstc_lo;  /* FAT32 */
    };
    uint32_t    size;
} __attribute__ ((packed)) fat_dentry_t;

extern fs_reg_t fat_reg;

extern void fat_lookup(ipc_callid_t, ipc_call_t *);

/*
 * The following interfaces are rather fs-neutral and might be later moved to a
 * dedicated library (e.g. libfs). We just wait until the interfaces stabilize
 * and until there is more than one fs implementation.
 */
extern int block_read(int, unsigned long, void *);
extern int block_write(int, unsigned long, void *);

extern void node_add_mp(int, unsigned long);
extern void node_del_mp(int, unsigned long);
extern bool node_is_mp(int, unsigned long);

#endif

/**
 * @}
 */