1 /* $OpenBSD: biosprobe.c,v 1.5 2014/03/29 18:09:29 guenther 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 } 84