2 * Copyright (C) 2005 TAKAHASHI Yoshihiro. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * The outputs of the three timers are connected as follows:
32 * timer 1 -> dma chan 0 (for dram refresh)
33 * timer 2 -> speaker (via keyboard controller)
35 * Timer 0 is used to call hardclock.
36 * Timer 2 is used to generate console beeps.
39 #ifndef _MACHINE_TIMERREG_H_
40 #define _MACHINE_TIMERREG_H_
44 #include <dev/ic/i8253reg.h>
46 #define IO_TIMER1 0x40 /* 8253 Timer #1 */
47 #define TIMER_CNTR0 (IO_TIMER1 + TIMER_REG_CNTR0)
48 #define TIMER_CNTR1 (IO_TIMER1 + TIMER_REG_CNTR1)
49 #define TIMER_CNTR2 (IO_TIMER1 + TIMER_REG_CNTR2)
50 #define TIMER_MODE (IO_TIMER1 + TIMER_REG_MODE)
54 #endif /* _MACHINE_TIMERREG_H_ */