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/ppireg.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/9.0/sys/i386/include/ppireg.h 146211 2005-05-14 09:10:02Z nyan $
   26  */
   27 
   28 #ifndef _MACHINE_PPIREG_H_
   29 #define _MACHINE_PPIREG_H_
   30 
   31 #ifdef _KERNEL
   32 
   33 #define IO_PPI          0x61    /* Programmable Peripheral Interface */
   34 
   35 /*
   36  * PPI speaker control values
   37  */
   38 
   39 #define PIT_ENABLETMR2  0x01    /* Enable timer/counter 2 */
   40 #define PIT_SPKRDATA    0x02    /* Direct to speaker */
   41 
   42 #define PIT_SPKR        (PIT_ENABLETMR2 | PIT_SPKRDATA)
   43 
   44 #define ppi_spkr_on()   outb(IO_PPI, inb(IO_PPI) | PIT_SPKR)
   45 #define ppi_spkr_off()  outb(IO_PPI, inb(IO_PPI) & ~PIT_SPKR)
   46 
   47 #endif /* _KERNEL */
   48 
   49 #endif /* _MACHINE_PPIREG_H_ */

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