| 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 | |
| 28 | /* |
| 29 | * The outputs of the three timers are connected as follows: |
| 30 | * |
| 31 | * timer 0 -> irq 0 |
| 32 | * timer 1 -> dma chan 0 (for dram refresh) |
| 33 | * timer 2 -> speaker (via keyboard controller) |
| 34 | * |
| 35 | * Timer 0 is used to call hardclock. |
| 36 | * Timer 2 is used to generate console beeps. |
| 37 | */ |
| 38 | |
| 39 | #ifndef _MACHINE_TIMERREG_H_ |
| 40 | #define _MACHINE_TIMERREG_H_ |
| 41 | |
| 42 | #ifdef _KERNEL |
| 43 | |
| 44 | #include <dev/ic/i8253reg.h> |
| 45 | |
| 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) |
| 51 | |
| 52 | #endif /* _KERNEL */ |
| 53 | |
| 54 | #endif /* _MACHINE_TIMERREG_H_ */ |