dist/ntp/kernel/sys/i8253.h

   1 /*      $NetBSD$        */
   2
   3 /* Copyright (c) 1995 Vixie Enterprises
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies, and that
   8  * the name of Vixie Enterprises not be used in advertising or publicity
   9  * pertaining to distribution of the document or software without specific,
  10  * written prior permission.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND VIXIE ENTERPRISES DISCLAIMS ALL
  13  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  14  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL VIXIE ENTERPRISES
  15  * BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
  16  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  17  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  18  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  19  * SOFTWARE.
  20  */
  21
  22 #ifndef _I8253_DEFINED
  23 #define _I8253_DEFINED
  24
  25 typedef union {
  26         unsigned char   i;
  27         struct {
  28                 unsigned int    bcd     : 1;
  29 #define                         i8253_binary    0
  30 #define                         i8253_bcd       1
  31                 unsigned int    mode    : 3;
  32 #define                         i8253_termcnt   0
  33 #define                         i8253_oneshot   1
  34 #define                         i8253_rategen   2
  35 #define                         i8253_sqrwave   3
  36 #define                         i8253_softstb   4
  37 #define                         i8253_hardstb   5
  38                 unsigned int    rl      : 2;
  39 #define                         i8253_latch     0
  40 #define                         i8253_lsb       1
  41 #define                         i8253_msb       2
  42 #define                         i8253_lmb       3
  43                 unsigned int    cntr    : 2;
  44 #define                         i8253_cntr_0    0
  45 #define                         i8253_cntr_1    1
  46 #define                         i8253_cntr_2    2
  47         } s;
  48 } i8253_ctrl;
  49
  50 #endif /*_I8253_DEFINED*/