1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2005 TAKAHASHI Yoshihiro. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 /* 31 * The outputs of the three timers are connected as follows: 32 * 33 * timer 0 -> irq 0 34 * timer 1 -> dma chan 0 (for dram refresh) 35 * timer 2 -> speaker (via keyboard controller) 36 * 37 * Timer 0 is used to call hardclock. 38 * Timer 2 is used to generate console beeps. 39 */ 40 41 #ifndef _MACHINE_TIMERREG_H_ 42 #define _MACHINE_TIMERREG_H_ 43 44 #ifdef _KERNEL 45 46 #include <dev/ic/i8253reg.h> 47 48 #define IO_TIMER1 0x40 /* 8253 Timer #1 */ 49 #define TIMER_CNTR0 (IO_TIMER1 + TIMER_REG_CNTR0) 50 #define TIMER_CNTR1 (IO_TIMER1 + TIMER_REG_CNTR1) 51 #define TIMER_CNTR2 (IO_TIMER1 + TIMER_REG_CNTR2) 52 #define TIMER_MODE (IO_TIMER1 + TIMER_REG_MODE) 53 54 #endif /* _KERNEL */ 55 56 #endif /* _MACHINE_TIMERREG_H_ */ 57