1/*	$NetBSD: biosmemps2.S,v 1.5 2011/02/20 05:45:48 jakllsch Exp $	*/
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jaromir Dolecek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33
34	.text
35
36/* int getextmemp2(void buffer)
37   call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION
38   return: 0=OK, nonzero=error
39   buffer: filled with memory-map table structure
40*/
41ENTRY(getextmemps2)
42	.code32
43	movl	%eax, %edx
44	xorl	%eax, %eax
45	pusha
46
47	call	_C_LABEL(prot_to_real)
48	.code16
49
50	# do int15, function 0xc0 call to discover if C7h is supported
51	movb	$0xc0, %ah
52	int	$0x15
53	setc	%cl
54	jc	out		# 0xc0 not supported if carry set
55
56	# check feature byte 2, bit 4 to see if return memory map is supported
57	movb	%es:6(%bx), %al
58	andb	$0x10, %al
59	jnz	getmem		# 0xc7 supported
60
61	# set %cl to indicate failure, and exit
62	movb	$2, %cl
63	jmp	out
64
65getmem:
66	# move the parameter to right register
67	push	%ds
68	movl	%edx, %esi
69	andl	$0xf, %esi
70	shrl	$4, %edx
71	mov	%ds, %ax
72	add	%dx, %ax
73	mov	%ax, %ds
74
75	# actually call int15, function 0xc7 now
76	movb	$0xc7, %ah
77	int	$0x15
78	setc	%cl		# save carry
79	pop	%ds
80
81out:
82	calll	_C_LABEL(real_to_prot)
83	.code32
84
85	movb	%cl, 28(%esp)
86	popa
87	ret
88