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Annotation of sys/arch/i386/include/pc/msdos.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: msdos.h,v 1.2 2000/08/05 22:05:31 niklas Exp $        */
                      2: /*     $NetBSD: msdos.h,v 1.3 1994/10/27 04:16:37 cgd Exp $    */
                      3:
                      4: /*
                      5:  * msdos common header file
                      6:  * [obtained from mtools -wfj]
                      7:  * how to decipher DOS disk structures in coexisting with DOS
                      8:  */
                      9:
                     10: #define MSECTOR_SIZE   512             /* MSDOS sector size in bytes */
                     11: #define MDIR_SIZE      32              /* MSDOS directory size in bytes */
                     12: #define MAX_CLUSTER    8192            /* largest cluster size */
                     13: #define MAX_PATH       128             /* largest MSDOS path length */
                     14: #define MAX_DIR_SECS   64              /* largest directory (in sectors) */
                     15:
                     16: #define NEW            1
                     17: #define OLD            0
                     18:
                     19: struct directory {
                     20:        unsigned char name[8];          /* file name */
                     21:        unsigned char ext[3];           /* file extension */
                     22:        unsigned char attr;             /* attribute byte */
                     23:        unsigned char reserved[10];     /* ?? */
                     24:        unsigned char time[2];          /* time stamp */
                     25:        unsigned char date[2];          /* date stamp */
                     26:        unsigned char start[2];         /* starting cluster number */
                     27:        unsigned char size[4];          /* size of the file */
                     28: };
                     29:
                     30: struct bootsector {
                     31:        unsigned char jump[3];          /* Jump to boot code */
                     32:        unsigned char banner[8];        /* OEM name & version */
                     33:        unsigned char secsiz[2];        /* Bytes per sector hopefully 512 */
                     34:        unsigned char clsiz;            /* Cluster size in sectors */
                     35:        unsigned char nrsvsect[2];      /* Number of reserved (boot) sectors */
                     36:        unsigned char nfat;             /* Number of FAT tables hopefully 2 */
                     37:        unsigned char dirents[2];       /* Number of directory slots */
                     38:        unsigned char psect[2];         /* Total sectors on disk */
                     39:        unsigned char descr;            /* Media descriptor=first byte of FAT */
                     40:        unsigned char fatlen[2];        /* Sectors in FAT */
                     41:        unsigned char nsect[2];         /* Sectors/track */
                     42:        unsigned char nheads[2];        /* Heads */
                     43:        unsigned char nhs[4];           /* number of hidden sectors */
                     44:        unsigned char bigsect[4];       /* big total sectors */
                     45:        unsigned char junk[476];        /* who cares? */
                     46: };
                     47:
                     48: /* DOS partition table -- located in boot block */
                     49:
                     50: #define        DOSBBSECTOR     0       /* DOS boot block relative sector number */
                     51: #define        DOSPARTOFF      446
                     52: #define NDOSPART       4
                     53:
                     54: struct dos_partition {
                     55:        unsigned char   dp_flag;        /* bootstrap flags */
                     56:        unsigned char   dp_shd;         /* starting head */
                     57:        unsigned char   dp_ssect;       /* starting sector */
                     58:        unsigned char   dp_scyl;        /* starting cylinder */
                     59:        unsigned char   dp_typ;         /* partition type */
                     60: #define                DOSPTYP_386BSD  0xa5            /* 386BSD partition type */
                     61:        unsigned char   dp_ehd;         /* end head */
                     62:        unsigned char   dp_esect;       /* end sector */
                     63:        unsigned char   dp_ecyl;        /* end cylinder */
                     64:        unsigned long   dp_start;       /* absolute starting sector number */
                     65:        unsigned long   dp_size;        /* partition size in sectors */
                     66: } dos_partitions[NDOSPART];