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Annotation of coherent/f/usr/include.78/sys/fdisk.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 4.0
                      3:  *     Copyright (c) 1982, 1992 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * fdisk.h
                      8:  * Fixed disk configuration.
                      9:  * The first sector (boot block) of each hard disk
                     10:  * should contain a fixed disk boot record (HDISK_S).
                     11:  */
                     12: 
                     13: #ifndef        __SYS_FDISK_H__
                     14: #define        __SYS_FDISK_H__
                     15: 
                     16: #define        NPARTN  4                       /* Partitions per drive  */
                     17: #define        HDSIG   0xAA55                  /* Signature word        */
                     18: #define        SDEV    0x80                    /* Special minor device  */
                     19: 
                     20: /*
                     21:  * System indicators.
                     22:  * There is disagreement about some of these.
                     23:  * Is there an official list?
                     24:  */
                     25: #define        SYS_EMPTY       0       /* Empty                        */
                     26: #define        SYS_DOS_12      1       /* MS-DOS, 12-bit FAT           */
                     27: #define        SYS_XENIX       2       /* Xenix                        */
                     28: #define        SYS_DOS_16      4       /* MS-DOS, 16-bit FAT           */
                     29: #define SYS_DOS_XP     5       /* MS-DOS, extended partition   */
                     30: #define        SYS_DOS_LARGE   6       /* MS-DOS, large filesystem     */
                     31: #define        SYS_COH         9       /* Coherent                     */
                     32: #define        SYS_SWAP        10      /* Coherent swap partition      */
                     33: 
                     34: /*
                     35:  * Be careful when using the FDISK_S or HDISK_S structure:
                     36:  * the two high order bits of p_bsec and p_esec on the boot block
                     37:  * provide the two high order bits of p_bcyl and p_ecyl, respectively.
                     38:  */
                     39: #define SECMASK 0x3F   /* Mask for sector number bits of sector fields.     */
                     40: #define CYLMASK 0xC0   /* Mask for cylinder number bits of sector fields.   */
                     41: #define        bcyl(p) ((((p)->p_bsec & CYLMASK) << 2) | ((p)->p_bcyl))
                     42: #define        bhd(p)  ((p)->p_bhd)
                     43: #define        bsec(p) ((p)->p_bsec & SECMASK) 
                     44: #define        ecyl(p) ((((p)->p_esec & CYLMASK) << 2) | ((p)->p_ecyl))
                     45: #define        ehd(p)  ((p)->p_ehd)
                     46: #define        esec(p) ((p)->p_esec & SECMASK)
                     47: 
                     48: /* Per partition information. */
                     49: #pragma align 1
                     50: typedef        struct  fdisk_s {
                     51:        unsigned char   p_boot;         /* Boot indicator       */
                     52:        unsigned char   p_bhd;          /* Beginning head       */
                     53:        unsigned char   p_bsec;         /* Beginning sector     */
                     54:        unsigned char   p_bcyl;         /* Beginning cylinder   */
                     55:        unsigned char   p_sys;          /* System indicator     */
                     56:        unsigned char   p_ehd;          /* Ending head          */
                     57:        unsigned char   p_esec;         /* Ending sector        */
                     58:        unsigned char   p_ecyl;         /* Ending cylinder      */
                     59:        unsigned long           p_base;         /* Base block number    */
                     60:        unsigned long           p_size;         /* Size in blocks       */
                     61: } FDISK_S;
                     62: /* Hard disk master boot block. */
                     63: typedef        struct  hdisk_s {
                     64:        unsigned char   hd_boot[446];           /* Bootstrap            */
                     65: #pragma align 2
                     66:        struct fdisk_s  hd_partn[NPARTN];       /* Partition info*/
                     67: #pragma align
                     68:        unsigned short  hd_sig;                 /* Validating signature */
                     69: } HDISK_S;
                     70: #pragma align
                     71: 
                     72: #ifdef INKERNEL
                     73: /*
                     74:  * fdisk(dev_t sdev, FDISK_S pp[])
                     75:  * Read partition info from first block of a special device.
                     76:  * If valid, update partition array and return 1.
                     77:  */
                     78: extern int     fdisk();
                     79: #endif
                     80: 
                     81: #endif
                     82: 
                     83: /* end of fdisk.h */

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