The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/timerreg.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    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_ */

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