81acacd723
Support 32bit addresses >64k as valid on bios calls. Move stack for dosboot and biosboot to >64 so stack doesn't hit data. Use disk sector number passed by mbr code to select default partition (the mbr code doesn't do this yet). NB only biosboot and dosboot have been tested so far. (changes approved by christos and fvdl)
118 lines
3.3 KiB
ArmAsm
118 lines
3.3 KiB
ArmAsm
/* $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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