minix/sys/arch/i386/stand/lib/biosmemps2.S
2012-02-09 18:48:13 +01:00

87 lines
2.5 KiB
ArmAsm

/* $NetBSD: biosmemps2.S,v 1.6 2011/06/16 13:27:59 joerg Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jaromir Dolecek.
*
* 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.
*
* 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.
*/
#include <machine/asm.h>
.text
/* int getextmemp2(void buffer)
call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION
return: 0=OK, nonzero=error
buffer: filled with memory-map table structure
*/
ENTRY(getextmemps2)
.code32
movl %eax, %edx
xorl %eax, %eax
pusha
call _C_LABEL(prot_to_real)
.code16
# do int15, function 0xc0 call to discover if C7h is supported
movb $0xc0, %ah
int $0x15
setc %cl
jc out # 0xc0 not supported if carry set
# check feature byte 2, bit 4 to see if return memory map is supported
movb %es:6(%bx), %al
andb $0x10, %al
jnz getmem # 0xc7 supported
# set %cl to indicate failure, and exit
movb $2, %cl
jmp out
getmem:
# move the parameter to right register
push %ds
movl %edx, %esi
andl $0xf, %esi
shrl $4, %edx
mov %ds, %ax
add %dx, %ax
mov %ax, %ds
# actually call int15, function 0xc7 now
movb $0xc7, %ah
int $0x15
setc %cl # save carry
pop %ds
out:
calll _C_LABEL(real_to_prot)
.code32
movb %cl, 28(%esp)
popa
ret