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Annotation of coherent/f/usr/include/sys/hdioctl.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * /usr/include/sys/hdioctl.h
        !             3:  *
        !             4:  * Ioctl support for hard disk devices.
        !             5:  *
        !             6:  * Revised: Sun Aug  1 17:24:39 1993 CDT
        !             7:  */
        !             8: #ifndef __SYS_HDIOCTL_H__
        !             9: #define        __SYS_HDIOCTL_H__
        !            10: 
        !            11: #define        HDIOC   ('H' << 8)
        !            12: #define        HDGETA  (HDIOC|1)       /* get drive attributes */
        !            13: #define        HDSETA  (HDIOC|2)       /* set drive attributes */
        !            14: 
        !            15: /*
        !            16:  * Drive attributes
        !            17:  * Note: all fields defined as bytes to prevent compiler arith probs.
        !            18:  *     All multi-byte fields are stored low-byte first.
        !            19:  * This struct is configured for binary compatibility with ROM data!
        !            20:  */
        !            21: typedef struct hdparm_s {
        !            22:        unsigned char   ncyl[2];        /* number of cylinders */
        !            23:        unsigned char   nhead;          /* number heads */
        !            24:        unsigned char   rwccp[2];       /* reduced write curr cyl */
        !            25:        unsigned char   wpcc[2];        /* write pre-compensation cyl */
        !            26:        unsigned char   eccl;           /* max ecc data length */
        !            27:        unsigned char   ctrl;           /* control byte */
        !            28:        unsigned char   fill2[3];
        !            29:        unsigned char   landc[2];       /* landing zone cylinder */
        !            30:        unsigned char   nspt;           /* number of sectors per track */
        !            31:        unsigned char   hdfill3;
        !            32: } hdparm_t;
        !            33: 
        !            34: /* Macro for initializing drive parameter tables. */
        !            35: #define _HDPARMS(cyl,hd,spt,ctl,pcomp) { \
        !            36:        { (cyl) & 0xFF, (cyl) >> 8 }, hd, { 0, 0 }, \
        !            37:        { (pcomp) & 0xFF, (pcomp) >> 8 }, 0, ctl, \
        !            38:        { 0, 0, 0 }, { 0 , 0 }, spt, 0 }
        !            39: 
        !            40: /* Convert from a 2-element unsigned char array to unsigned short. */
        !            41: #define _CHAR2_TO_USHORT(c_array)      \
        !            42:        ((unsigned short) ((c_array)[1] << 8) | (c_array)[0])
        !            43: 
        !            44: /* Copy number into a 2-element unsigned char array. */
        !            45: #define _NUM_TO_CHAR2(c_array, num) \
        !            46:        (((c_array)[0] = num & 0xFF), ((c_array)[1] = num >> 8))
        !            47: 
        !            48: #if __KERNEL__
        !            49: #define N_ATDRV        2                       /* only two drives supported */
        !            50: #endif
        !            51: 
        !            52: #endif /* ndef __SYS_HDIOCTL_H__ */

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