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