biosmca.S revision 1.2
1 1.2 jdolecek /* $NetBSD: biosmca.S,v 1.2 2001/05/14 22:14:47 jdolecek Exp $ */ 2 1.1 jdolecek 3 1.1 jdolecek /* 4 1.1 jdolecek * Ported to boot 386BSD by Julian Elischer (julian (at) tfs.com) Sept 1992 5 1.1 jdolecek * 6 1.1 jdolecek * Mach Operating System 7 1.1 jdolecek * Copyright (c) 1992, 1991 Carnegie Mellon University 8 1.1 jdolecek * All Rights Reserved. 9 1.1 jdolecek * 10 1.1 jdolecek * Permission to use, copy, modify and distribute this software and its 11 1.1 jdolecek * documentation is hereby granted, provided that both the copyright 12 1.1 jdolecek * notice and this permission notice appear in all copies of the 13 1.1 jdolecek * software, derivative works or modified versions, and any portions 14 1.1 jdolecek * thereof, and that both notices appear in supporting documentation. 15 1.1 jdolecek * 16 1.1 jdolecek * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 1.1 jdolecek * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18 1.1 jdolecek * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 1.1 jdolecek * 20 1.1 jdolecek * Carnegie Mellon requests users of this software to return to 21 1.1 jdolecek * 22 1.1 jdolecek * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 23 1.1 jdolecek * School of Computer Science 24 1.1 jdolecek * Carnegie Mellon University 25 1.1 jdolecek * Pittsburgh PA 15213-3890 26 1.1 jdolecek * 27 1.1 jdolecek * any improvements or extensions that they make and grant Carnegie Mellon 28 1.1 jdolecek * the rights to redistribute these changes. 29 1.1 jdolecek */ 30 1.1 jdolecek 31 1.1 jdolecek /* 32 1.1 jdolecek Copyright 1988, 1989, 1990, 1991, 1992 33 1.1 jdolecek by Intel Corporation, Santa Clara, California. 34 1.1 jdolecek 35 1.1 jdolecek All Rights Reserved 36 1.1 jdolecek 37 1.1 jdolecek Permission to use, copy, modify, and distribute this software and 38 1.1 jdolecek its documentation for any purpose and without fee is hereby 39 1.1 jdolecek granted, provided that the above copyright notice appears in all 40 1.1 jdolecek copies and that both the copyright notice and this permission notice 41 1.1 jdolecek appear in supporting documentation, and that the name of Intel 42 1.1 jdolecek not be used in advertising or publicity pertaining to distribution 43 1.1 jdolecek of the software without specific, written prior permission. 44 1.1 jdolecek 45 1.1 jdolecek INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 46 1.1 jdolecek INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 47 1.1 jdolecek IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 48 1.1 jdolecek CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 49 1.1 jdolecek LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 50 1.1 jdolecek NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 51 1.1 jdolecek WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 52 1.1 jdolecek */ 53 1.1 jdolecek 54 1.1 jdolecek /* extracted from netbsd:sys/arch/i386/stand/bios_disk.S */ 55 1.1 jdolecek 56 1.1 jdolecek #include <machine/asm.h> 57 1.1 jdolecek 58 1.1 jdolecek #define addr32 .byte 0x67 59 1.1 jdolecek #define data32 .byte 0x66 60 1.1 jdolecek 61 1.2 jdolecek .data 62 1.2 jdolecek .globl _C_LABEL(biosmca_ps2model) 63 1.2 jdolecek _C_LABEL(biosmca_ps2model): .long 0 64 1.2 jdolecek 65 1.2 jdolecek .text 66 1.1 jdolecek /* 67 1.1 jdolecek # BIOS call "INT 0x15 Function 0xc0" to read extended sys config info on PS/2 68 1.2 jdolecek # Return: no return value 69 1.2 jdolecek # 70 1.2 jdolecek # This function initializes biosmca_ps2model with model number as 71 1.2 jdolecek # identified by BIOS, if the machine is a PS/2 box (i.e. has MCA bus 72 1.2 jdolecek # instead of ISA). 73 1.1 jdolecek */ 74 1.1 jdolecek ENTRY(biosmca) 75 1.1 jdolecek pushl %ebp 76 1.1 jdolecek movl %esp, %ebp 77 1.1 jdolecek pushl %ebx 78 1.1 jdolecek push %ecx 79 1.1 jdolecek push %edx 80 1.1 jdolecek push %esi 81 1.1 jdolecek push %edi 82 1.2 jdolecek push %eax 83 1.1 jdolecek 84 1.1 jdolecek call _C_LABEL(prot_to_real) # enter real mode 85 1.1 jdolecek 86 1.2 jdolecek # zero %cx 87 1.2 jdolecek data32 88 1.2 jdolecek xorl %cx, %cx 89 1.2 jdolecek 90 1.1 jdolecek data32 91 1.2 jdolecek xorl %ax, %ax 92 1.1 jdolecek movb $0xc0, %ah # subfunction 93 1.1 jdolecek int $0x15 94 1.2 jdolecek jc back 95 1.1 jdolecek 96 1.2 jdolecek # check feature byte 1 if MCA bus present and replaces ISA 97 1.2 jdolecek addr32 98 1.2 jdolecek movb %es:5(%ebx), %ax 99 1.2 jdolecek andw $0x02, %ax # bit 1 set means MCA instead of ISA 100 1.2 jdolecek cmpw $0x02, %ax # see also arch/i386/mca/mca_machdep.c 101 1.2 jdolecek jne back 102 1.2 jdolecek 103 1.2 jdolecek # save model and submodel bytes to %cx 104 1.1 jdolecek addr32 105 1.2 jdolecek movb %es:2(%ebx), %ch # model (1 byte) 106 1.1 jdolecek addr32 107 1.2 jdolecek movb %es:3(%ebx), %cl # submodel (1 byte) 108 1.1 jdolecek 109 1.1 jdolecek back: 110 1.1 jdolecek data32 111 1.1 jdolecek call _C_LABEL(real_to_prot) # back to protected mode 112 1.1 jdolecek 113 1.1 jdolecek # save model 114 1.2 jdolecek movl %ecx, _C_LABEL(biosmca_ps2model) 115 1.1 jdolecek 116 1.2 jdolecek pop %eax 117 1.1 jdolecek pop %edi 118 1.1 jdolecek pop %esi 119 1.1 jdolecek pop %edx 120 1.1 jdolecek pop %ecx 121 1.1 jdolecek popl %ebx 122 1.1 jdolecek popl %ebp 123 1.1 jdolecek ret 124
Indexes created Thu Oct 23 22:10:10 GMT 2025