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Annotation of sys/arch/i386/stand/libsa/ps2probe.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: ps2probe.c,v 1.1 2004/03/19 13:48:18 tom Exp $        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2001 Michael Shalayeff
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            18:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            19:  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
        !            20:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            21:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            22:  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            24:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
        !            25:  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
        !            26:  * THE POSSIBILITY OF SUCH DAMAGE.
        !            27:  */
        !            28:
        !            29: #include "libsa.h"
        !            30:
        !            31: int ps2model;
        !            32:
        !            33: void
        !            34: ps2probe(void)
        !            35: {
        !            36:        char *p;
        !            37:        int r;
        !            38:
        !            39:        __asm __volatile(DOINT(0x15) "\n\t"
        !            40:                         "setc %b0\n\t"
        !            41:                         : "=a" (r), "=b" (p)
        !            42:                         : "0" (0xc000)
        !            43:                         : "%ecx", "cc");
        !            44:        if (!(r & 0xff))
        !            45:                ps2model = (p[2] << 8) | p[3];
        !            46: }