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  * Copyright (C) 2005 TAKAHASHI Yoshihiro. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    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.
   12  *
   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
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD: releng/8.3/sys/i386/include/timerreg.h 199583 2009-11-20 15:27:52Z jhb $
   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_ */

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