/* $OpenBSD: biosprobe.c,v 1.5 2014/03/29 18:09:29 guenther Exp $ */ /* * Copyright (c) 2002 Tobias Weingartner * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include "disk.h" #include "debug.h" #include "libsa.h" #include "biosdev.h" void * getSYSCONFaddr(void) { u_int32_t status; u_int8_t *vers; __asm volatile(DOINT(0x15) "\n\t" "setc %%al\n\t" : "=a" (status) : "0" (0xC000) : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc"); /* On failure we go for a NULL */ if (status) return NULL; /* Calculate where the version bytes are */ vers = (void*)((BIOS_regs.biosr_es << 4) | BIOS_regs.biosr_bx); return vers; } void * getEBDAaddr(void) { u_int32_t status; u_int8_t *info; info = getSYSCONFaddr(); if (!info) return NULL; __asm volatile(DOINT(0x15) "\n\t" "setc %%al" : "=a" (status) : "0" (0xC100) : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc"); if (status) return NULL; info = (void *)(BIOS_regs.biosr_es << 4); return info; }