1/* $NetBSD: biosmca.S,v 1.2 2001/05/14 22:14:47 jdolecek Exp $ */ 2 3/* 4 * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 5 * 6 * Mach Operating System 7 * Copyright (c) 1992, 1991 Carnegie Mellon University 8 * All Rights Reserved. 9 * 10 * Permission to use, copy, modify and distribute this software and its 11 * documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie Mellon 28 * the rights to redistribute these changes. 29 */ 30 31/* 32 Copyright 1988, 1989, 1990, 1991, 1992 33 by Intel Corporation, Santa Clara, California. 34 35 All Rights Reserved 36 37Permission to use, copy, modify, and distribute this software and 38its documentation for any purpose and without fee is hereby 39granted, provided that the above copyright notice appears in all 40copies and that both the copyright notice and this permission notice 41appear in supporting documentation, and that the name of Intel 42not be used in advertising or publicity pertaining to distribution 43of the software without specific, written prior permission. 44 45INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 46INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 47IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 48CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 49LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 50NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 51WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 52*/ 53 54/* extracted from netbsd:sys/arch/i386/stand/bios_disk.S */ 55 56#include <machine/asm.h> 57 58#define addr32 .byte 0x67 59#define data32 .byte 0x66 60 61 .data 62 .globl _C_LABEL(biosmca_ps2model) 63_C_LABEL(biosmca_ps2model): .long 0 64 65 .text 66/* 67# BIOS call "INT 0x15 Function 0xc0" to read extended sys config info on PS/2 68# Return: no return value 69# 70# This function initializes biosmca_ps2model with model number as 71# identified by BIOS, if the machine is a PS/2 box (i.e. has MCA bus 72# instead of ISA). 73*/ 74ENTRY(biosmca) 75 pushl %ebp 76 movl %esp, %ebp 77 pushl %ebx 78 push %ecx 79 push %edx 80 push %esi 81 push %edi 82 push %eax 83 84 call _C_LABEL(prot_to_real) # enter real mode 85 86 # zero %cx 87 data32 88 xorl %cx, %cx 89 90 data32 91 xorl %ax, %ax 92 movb $0xc0, %ah # subfunction 93 int $0x15 94 jc back 95 96 # check feature byte 1 if MCA bus present and replaces ISA 97 addr32 98 movb %es:5(%ebx), %ax 99 andw $0x02, %ax # bit 1 set means MCA instead of ISA 100 cmpw $0x02, %ax # see also arch/i386/mca/mca_machdep.c 101 jne back 102 103 # save model and submodel bytes to %cx 104 addr32 105 movb %es:2(%ebx), %ch # model (1 byte) 106 addr32 107 movb %es:3(%ebx), %cl # submodel (1 byte) 108 109back: 110 data32 111 call _C_LABEL(real_to_prot) # back to protected mode 112 113 # save model 114 movl %ecx, _C_LABEL(biosmca_ps2model) 115 116 pop %eax 117 pop %edi 118 pop %esi 119 pop %edx 120 pop %ecx 121 popl %ebx 122 popl %ebp 123 ret 124