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: }
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