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

1.1       nbrk        1: /*     $OpenBSD: biosprobe.c,v 1.4 2004/03/09 19:12:12 tom Exp $       */
                      2:
                      3: /*
                      4:  * Copyright (c) 2002 Tobias Weingartner
                      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 BE LIABLE FOR ANY DIRECT, INDIRECT,
                     20:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     21:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     22:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     23:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     24:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     25:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     26:  */
                     27:
                     28: #include <sys/param.h>
                     29: #include <machine/biosvar.h>
                     30: #include <machine/pio.h>
                     31: #include <dev/cons.h>
                     32: #include <sys/disklabel.h>
                     33: #include "disk.h"
                     34: #include "debug.h"
                     35: #include "libsa.h"
                     36: #include "biosdev.h"
                     37:
                     38:
                     39: void *
                     40: getSYSCONFaddr(void)
                     41: {
                     42:        u_int32_t status;
                     43:        u_int8_t *vers;
                     44:
                     45:        __asm __volatile(DOINT(0x15) "\n\t"
                     46:            "setc %%al\n\t"
                     47:            : "=a" (status)
                     48:            : "0" (0xC000)
                     49:            : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
                     50:
                     51:        /* On failure we go for a NULL */
                     52:        if (status)
                     53:                return NULL;
                     54:
                     55:        /* Calculate where the version bytes are */
                     56:        vers = (void*)((BIOS_regs.biosr_es << 4) | BIOS_regs.biosr_bx);
                     57:        return vers;
                     58: }
                     59:
                     60: void *
                     61: getEBDAaddr(void)
                     62: {
                     63:        u_int32_t status;
                     64:        u_int8_t *info;
                     65:
                     66:        info = getSYSCONFaddr();
                     67:
                     68:        if (!info)
                     69:                return NULL;
                     70:
                     71:        __asm __volatile(DOINT(0x15) "\n\t"
                     72:            "setc %%al"
                     73:            : "=a" (status)
                     74:            : "0" (0xC100)
                     75:            : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
                     76:
                     77:        if (status)
                     78:                return NULL;
                     79:
                     80:        info = (void *)(BIOS_regs.biosr_es << 4);
                     81:
                     82:        return info;
                     83: }