Change biosmca() to export the model number via biosmca_ps2model
variable, if the machine has a MCA bus according to info returned by BIOS (i.e. on machines without MCA bus, biosmca_ps2model would be zero). biosmca() is expected to be called on beginning the initialization, and biosmca_ps2model is then used for further checks.
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jdolecek
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@ -1,4 +1,4 @@
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/* $NetBSD: biosmca.S,v 1.1 2001/05/02 13:41:07 jdolecek Exp $ */
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/* $NetBSD: biosmca.S,v 1.2 2001/05/14 22:14:47 jdolecek 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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@ -58,13 +58,18 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#define addr32 .byte 0x67
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#define data32 .byte 0x66
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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:
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# %ah = 0x0 on success; err code on failure
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# %es:%bx = segment:offset of ROM address of sys config
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# Called like
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# biosmca(&model, &features)
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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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pushl %ebp
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@ -74,41 +79,41 @@ ENTRY(biosmca)
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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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# zero %cx
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data32
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movl $0xa0, %ax # set table length to 0
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xorl %cx, %cx
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data32
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xorl %ax, %ax
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movb $0xc0, %ah # subfunction
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int $0x15
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jc err
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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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addr32
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movl %es, %cx
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addr32
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movl %bx, %dx
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data32
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movl %ax, %bx
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jmp back
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movb %es:5(%ebx), %ax
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andw $0x02, %ax # bit 1 set means MCA instead of ISA
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cmpw $0x02, %ax # see also arch/i386/mca/mca_machdep.c
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jne back
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err:
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data32
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movb $0, %bx
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# save model and submodel bytes to %cx
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addr32
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movb %es:2(%ebx), %ch # model (1 byte)
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addr32
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movb %es:3(%ebx), %cl # submodel (1 byte)
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back:
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data32
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call _C_LABEL(real_to_prot) # back to protected mode
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xorl %eax, %eax
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movw %bx, %ax # return value in %ax
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# save model
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movl 28(%esp), %ebx
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movl %ecx, 0(%ebx)
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# save bios rev & features
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movl 32(%esp), %ebx
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movl %edx, 0(%ebx)
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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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38
sys/arch/i386/stand/lib/biosmca.h
Normal file
38
sys/arch/i386/stand/lib/biosmca.h
Normal file
@ -0,0 +1,38 @@
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/* $NetBSD: biosmca.h,v 1.1 2001/05/14 22:14:47 jdolecek Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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void biosmca __P((void));
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extern int biosmca_ps2model;
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