/contrib/ntp/kernel/sys/i8253.h

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