Subversion Repositories HelenOS

Rev

Rev 99 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
98 cejka 1 
/*
2 
 * Copyright (C) 2005 Josef Cejka
3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
95 cejka 28 
 
29 
 
30 
#include <arch/boot/memmap.h>
31 
 
32 
.global memmap_arch_init
33 
 
34 
.code16
35 
.section K_TEXT_START
36 
 
98 cejka 37 
 
38 
E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
39 
E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
40 
E820_SMAP = 0x534d4150
41 
 
42 
.global memmap_arch_init
43 
 
44 
.code16
45 
.section K_TEXT_START
46 
 
95 cejka 47 
memmap_arch_init:
98 cejka 48 
 
49 
e820begin:
99 jermar 50 
	xorl	%ebx,%ebx	# during first call, ebx must be 0
98 cejka 51 
 
52 
	movw	$e820table,%di
53 
	movb	$E820_MAX_RECORDS,(e820counter)
54 
e820loop:
55 
	movl	$E820_SMAP,%edx 	# constrol sequence "SMAP"
56 
	pushw	%ds
57 
	popw	%es		# e820 buffer address
58 
 
59 
	movl	$0xe820,%eax		# service
60 
	movl	$E820_RECORD_SIZE,%ecx
61 
	int 	$0x15
62 
	jc		e820end
63 
 
64 
 
99 jermar 65 
	cmpl	$E820_SMAP,%eax		# verifying BIOS
98 cejka 66 
	jne		e820end
67 
 
68 
	movw	%di,%ax		# next record
69 
	addw	$E820_RECORD_SIZE,%ax
70 
	movw	%ax,%di
71 
 
101 cejka 72 
	decb	(e820counter) # buffer is full
73 
	jz	e820end
98 cejka 74 
 
101 cejka 75 
	cmpl	$0,%ebx
76 
	jne	e820loop
77 
 
98 cejka 78 
e820end:
79 
 
80 
	movb	(e820counter),%al
81 
	negb	%al
82 
	addb	$32,%al
83 
	movb	%al,(e820counter) # store # of valid entries in e820counter
84 
 
85 
	ret
86 
 
87 
 
88 
e820counter:
89 
	.byte 0
90 
 
91 
e820table:
99 jermar 92 
	.space  (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long