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Annotation of sys/arch/i386/stand/libsa/ps2probe.c, Revision 1.1.1.1

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: }