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.
This commit is contained in:
jdolecek
parent
b4f19b2d56
commit
a97bf5e6b4
@ -1,4 +1,4 @@
|
||||
/* $NetBSD: biosmca.S,v 1.1 2001/05/02 13:41:07 jdolecek Exp $ */
|
||||
/* $NetBSD: biosmca.S,v 1.2 2001/05/14 22:14:47 jdolecek Exp $ */
|
||||
|
||||
/*
|
||||
* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
|
||||
@ -58,13 +58,18 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
#define addr32 .byte 0x67
|
||||
#define data32 .byte 0x66
|
||||
|
||||
.data
|
||||
.globl _C_LABEL(biosmca_ps2model)
|
||||
_C_LABEL(biosmca_ps2model): .long 0
|
||||
|
||||
.text
|
||||
/*
|
||||
# BIOS call "INT 0x15 Function 0xc0" to read extended sys config info on PS/2
|
||||
# Return:
|
||||
# %ah = 0x0 on success; err code on failure
|
||||
# %es:%bx = segment:offset of ROM address of sys config
|
||||
# Called like
|
||||
# biosmca(&model, &features)
|
||||
# Return: no return value
|
||||
#
|
||||
# This function initializes biosmca_ps2model with model number as
|
||||
# identified by BIOS, if the machine is a PS/2 box (i.e. has MCA bus
|
||||
# instead of ISA).
|
||||
*/
|
||||
ENTRY(biosmca)
|
||||
pushl %ebp
|
||||
@ -74,41 +79,41 @@ ENTRY(biosmca)
|
||||
push %edx
|
||||
push %esi
|
||||
push %edi
|
||||
push %eax
|
||||
|
||||
call _C_LABEL(prot_to_real) # enter real mode
|
||||
|
||||
# zero %cx
|
||||
data32
|
||||
movl $0xa0, %ax # set table length to 0
|
||||
xorl %cx, %cx
|
||||
|
||||
data32
|
||||
xorl %ax, %ax
|
||||
movb $0xc0, %ah # subfunction
|
||||
int $0x15
|
||||
jc err
|
||||
jc back
|
||||
|
||||
# check feature byte 1 if MCA bus present and replaces ISA
|
||||
addr32
|
||||
movl %es, %cx
|
||||
movb %es:5(%ebx), %ax
|
||||
andw $0x02, %ax # bit 1 set means MCA instead of ISA
|
||||
cmpw $0x02, %ax # see also arch/i386/mca/mca_machdep.c
|
||||
jne back
|
||||
|
||||
# save model and submodel bytes to %cx
|
||||
addr32
|
||||
movl %bx, %dx
|
||||
data32
|
||||
movl %ax, %bx
|
||||
jmp back
|
||||
|
||||
err:
|
||||
data32
|
||||
movb $0, %bx
|
||||
movb %es:2(%ebx), %ch # model (1 byte)
|
||||
addr32
|
||||
movb %es:3(%ebx), %cl # submodel (1 byte)
|
||||
|
||||
back:
|
||||
data32
|
||||
call _C_LABEL(real_to_prot) # back to protected mode
|
||||
|
||||
xorl %eax, %eax
|
||||
movw %bx, %ax # return value in %ax
|
||||
|
||||
# save model
|
||||
movl 28(%esp), %ebx
|
||||
movl %ecx, 0(%ebx)
|
||||
# save bios rev & features
|
||||
movl 32(%esp), %ebx
|
||||
movl %edx, 0(%ebx)
|
||||
movl %ecx, _C_LABEL(biosmca_ps2model)
|
||||
|
||||
pop %eax
|
||||
pop %edi
|
||||
pop %esi
|
||||
pop %edx
|
||||
|
||||
38
sys/arch/i386/stand/lib/biosmca.h
Normal file
38
sys/arch/i386/stand/lib/biosmca.h
Normal file
@ -0,0 +1,38 @@
|
||||
/* $NetBSD: biosmca.h,v 1.1 2001/05/14 22:14:47 jdolecek Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||||
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||||
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
void biosmca __P((void));
|
||||
|
||||
extern int biosmca_ps2model;
|
||||
Loading…
Reference in New Issue
Block a user