118 lines
3.3 KiB
ArmAsm
118 lines
3.3 KiB
ArmAsm
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/* $NetBSD: biosmca.S,v 1.4 2003/02/01 14:48:18 dsl Exp $ */
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/*
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* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
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*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* extracted from netbsd:sys/arch/i386/stand/bios_disk.S */
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#include <machine/asm.h>
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.data
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.globl _C_LABEL(biosmca_ps2model)
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_C_LABEL(biosmca_ps2model): .long 0
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.text
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/*
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# BIOS call "INT 0x15 Function 0xc0" to read extended sys config info on PS/2
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# Return: no return value
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#
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# This function initializes biosmca_ps2model with model number as
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# identified by BIOS, if the machine is a PS/2 box (i.e. has MCA bus
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# instead of ISA).
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*/
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ENTRY(biosmca)
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.code32
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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push %ecx
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push %edx
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push %esi
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push %edi
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push %eax
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call _C_LABEL(prot_to_real) # enter real mode
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.code16
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# zero %ecx
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xorl %ecx, %ecx
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xor %ax, %ax
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movb $0xc0, %ah # subfunction
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int $0x15
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jc back
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# check feature byte 1 if MCA bus present and replaces ISA
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movb %es:5(%bx), %al
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andb $0x02, %al # bit 1 set means MCA instead of ISA
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# see also arch/i386/mca/mca_machdep.c
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jnz back
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# save model and submodel bytes to %cx
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movb %es:2(%bx), %ch # model (1 byte)
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movb %es:3(%bx), %cl # submodel (1 byte)
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back:
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calll _C_LABEL(real_to_prot) # back to protected mode
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.code32
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# save model
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movl %ecx, _C_LABEL(biosmca_ps2model)
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pop %eax
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pop %edi
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pop %esi
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pop %edx
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pop %ecx
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popl %ebx
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popl %ebp
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ret
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