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2627 jermar 1
/*
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 * Copyright (c) 2007 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */
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#ifndef FAT_FAT_H_
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#define FAT_FAT_H_
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#include <ipc/ipc.h>
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#include <libfs.h>
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#include <atomic.h>
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#include <sys/types.h>
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#include <bool.h>
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#define dprintf(...)    printf(__VA_ARGS__)
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typedef struct {
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    uint8_t     ji[3];      /**< Jump instruction. */
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    uint8_t     oem_name[8];
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    /* BIOS Parameter Block */
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    uint16_t    bps;        /**< Bytes per sector. */
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    uint8_t     spc;        /**< Sectors per cluster. */
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    uint16_t    rsc;        /**< Reserved sector count. */
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    uint8_t     fatcnt;     /**< Number of FATs. */
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    uint16_t    root_ent_max;   /**< Maximum number of root directory
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                         entries. */
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    uint16_t    totsec;     /**< Total sectors. */
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    uint8_t     mdesc;      /**< Media descriptor. */
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    uint16_t    sec_per_fat;    /**< Sectors per FAT12/FAT16. */
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    uint16_t    sec_per_track;  /**< Sectors per track. */
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    uint16_t    headcnt;    /**< Number of heads. */
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    uint32_t    hidden_sec; /**< Hidden sectors. */
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    uint32_t    total_sec;  /**< Total sectors. */
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    union {
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        struct {
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            /* FAT12/FAT16 only: Extended BIOS Parameter Block */
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            /** Physical drive number. */
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            uint8_t     pdn;
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            uint8_t     reserved;
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            /** Extended boot signature. */
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            uint8_t     ebs;
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            /** Serial number. */
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            uint32_t    id;
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            /** Volume label. */
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            uint8_t     label[11];
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            /** FAT type. */
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            uint8_t     type[8];
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            /** Boot code. */
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            uint8_t     boot_code[448];
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            /** Boot sector signature. */
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            uint16_t    signature;
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        } __attribute__ ((packed));
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        struct {
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            /* FAT32 only */
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            /** Sectors per FAT. */
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            uint32_t    sectors_per_fat;
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            /** FAT flags. */
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            uint16_t    flags;
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            /** Version. */
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            uint16_t    version;
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            /** Cluster number of root directory. */
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            uint32_t    root_cluster;
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            /** Sector number of file system information sector. */
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            uint16_t    fsinfo_sec;
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            /** Sector number of boot sector copy. */
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            uint16_t    bscopy_sec;
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            uint8_t     reserved1[12];
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            /** Physical drive number. */
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            uint8_t     pdn;
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            uint8_t     reserved2;
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            /** Extended boot signature. */
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            uint8_t     ebs;
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            /** Serial number. */
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            uint32_t    id;
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            /** Volume label. */
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            uint8_t     label;
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            /** FAT type. */
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            uint8_t     type[8];
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            /** Boot code. */
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            uint8_t     boot_code[420];
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            /** Signature. */
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            uint16_t    signature;
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        } __attribute__ ((packed));
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    };
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} __attribute__ ((packed)) fat_bs_t;
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typedef struct {
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    uint8_t     name[8];
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    uint8_t     ext[3];
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    uint8_t     attr;
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    uint8_t     reserved;
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    uint8_t     ctime_fine;
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    uint16_t    ctime;
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    uint16_t    cdate;
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    uint16_t    adate;
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    union {
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        uint16_t    eaidx;      /* FAT12/FAT16 */
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        uint16_t    firstc_hi;  /* FAT32 */
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    };
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    uint16_t    mtime;
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    uint16_t    mdate;
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    union {
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        uint16_t    firstc;     /* FAT12/FAT16 */
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        uint16_t    firstc_lo;  /* FAT32 */
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    };
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    uint32_t    size;
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} __attribute__ ((packed)) fat_dentry_t;
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extern fs_reg_t fat_reg;
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extern void fat_lookup(ipc_callid_t, ipc_call_t *);
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/*
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 * The following interfaces are rather fs-neutral and might be later moved to a
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 * dedicated library (e.g. libfs). We just wait until the interfaces stabilize
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 * and until there is more than one fs implementation.
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 */
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extern int block_read(int, unsigned long, void *);
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extern int block_write(int, unsigned long, void *);
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extern void node_add_mp(int, unsigned long);
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extern void node_del_mp(int, unsigned long);
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extern bool node_is_mp(int, unsigned long);
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#endif
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/**
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 * @}
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 */