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Annotation of Net2/arch/i386/include/pc/msdos.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * msdos common header file
        !             3:  * [obtained from mtools -wfj]
        !             4:  * how to decipher DOS disk structures in coexisting with DOS
        !             5:  */
        !             6: 
        !             7: #define MSECTOR_SIZE   512             /* MSDOS sector size in bytes */
        !             8: #define MDIR_SIZE      32              /* MSDOS directory size in bytes */
        !             9: #define MAX_CLUSTER    8192            /* largest cluster size */
        !            10: #define MAX_PATH       128             /* largest MSDOS path length */
        !            11: #define MAX_DIR_SECS   64              /* largest directory (in sectors) */
        !            12: 
        !            13: #define NEW            1
        !            14: #define OLD            0
        !            15: 
        !            16: struct directory {
        !            17:        unsigned char name[8];          /* file name */
        !            18:        unsigned char ext[3];           /* file extension */
        !            19:        unsigned char attr;             /* attribute byte */
        !            20:        unsigned char reserved[10];     /* ?? */
        !            21:        unsigned char time[2];          /* time stamp */
        !            22:        unsigned char date[2];          /* date stamp */
        !            23:        unsigned char start[2];         /* starting cluster number */
        !            24:        unsigned char size[4];          /* size of the file */
        !            25: };
        !            26: 
        !            27: struct bootsector {
        !            28:        unsigned char jump[3];          /* Jump to boot code */
        !            29:        unsigned char banner[8];        /* OEM name & version */
        !            30:        unsigned char secsiz[2];        /* Bytes per sector hopefully 512 */
        !            31:        unsigned char clsiz;            /* Cluster size in sectors */
        !            32:        unsigned char nrsvsect[2];      /* Number of reserved (boot) sectors */
        !            33:        unsigned char nfat;             /* Number of FAT tables hopefully 2 */
        !            34:        unsigned char dirents[2];       /* Number of directory slots */
        !            35:        unsigned char psect[2];         /* Total sectors on disk */
        !            36:        unsigned char descr;            /* Media descriptor=first byte of FAT */
        !            37:        unsigned char fatlen[2];        /* Sectors in FAT */
        !            38:        unsigned char nsect[2];         /* Sectors/track */
        !            39:        unsigned char nheads[2];        /* Heads */
        !            40:        unsigned char nhs[4];           /* number of hidden sectors */
        !            41:        unsigned char bigsect[4];       /* big total sectors */
        !            42:        unsigned char junk[476];        /* who cares? */
        !            43: };
        !            44: 
        !            45: /* DOS partition table -- located in boot block */
        !            46: 
        !            47: #define        DOSBBSECTOR     0       /* DOS boot block relative sector number */
        !            48: #define        DOSPARTOFF      446
        !            49: #define NDOSPART       4
        !            50: 
        !            51: struct dos_partition {
        !            52:        unsigned char   dp_flag;        /* bootstrap flags */
        !            53:        unsigned char   dp_shd;         /* starting head */
        !            54:        unsigned char   dp_ssect;       /* starting sector */
        !            55:        unsigned char   dp_scyl;        /* starting cylinder */
        !            56:        unsigned char   dp_typ;         /* partition type */
        !            57: #define                DOSPTYP_386BSD  0xa5            /* 386BSD partition type */
        !            58:        unsigned char   dp_ehd;         /* end head */
        !            59:        unsigned char   dp_esect;       /* end sector */
        !            60:        unsigned char   dp_ecyl;        /* end cylinder */
        !            61:        unsigned long   dp_start;       /* absolute starting sector number */
        !            62:        unsigned long   dp_size;        /* partition size in sectors */
        !            63: } dos_partitions[NDOSPART];

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