WebSVN – HelenOS – Diff – /SPARTAN/trunk/arch/ia32/src/boot/memmap.s


/*
 * Copyright (C) 2005 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <arch/boot/memmapasm.h>
 
 
 
E820_SMAP = 0x534d4150
 
.global memmap_arch_init
.global e801memorysize
 
.code16
.section K_TEXT_START_2
 
memmap_arch_init:
 
e820begin:
	xorl	%ebx,%ebx	# during first call, ebx must be 0
	movw	%bx,%ds
	movw	%bx,%es
	movw	$e820table_boot,%di
	movb	$MEMMAP_E820_MAX_RECORDS,e820counter_boot
e820loop:	
	movl	$E820_SMAP,%edx 	# control sequence "SMAP"
 
	movl	$0x0000e820,%eax	# service
	movl	$MEMMAP_E820_RECORD_SIZE,%ecx
	int 	$0x15
	jc	e820err
	
	cmpl	$E820_SMAP,%eax		# verifying BIOS
	jne	e820err
 
	cmpl	$MEMMAP_E820_RECORD_SIZE,%ecx
	jne	e820err			# bad record size - bug in bios
	
	movw	%di,%ax		# next record
	addw	$MEMMAP_E820_RECORD_SIZE,%ax
	movw	%ax,%di
		
	decb	e820counter_boot # buffer is full
	jz	e820end
	
	cmpl	$0,%ebx	
	jne	e820loop
	
e820end:
	movb	$MEMMAP_E820_MAX_RECORDS,%al
	subb	e820counter_boot,%al
	movb	%al,e820counter_boot # store # of valid entries in e820counter
 
	jmp	e801begin
 
e820err:
	movb	$0,e820counter_boot
 
# method e801 - get size of memory
 
e801begin:
	xorw	%dx,%dx
	xorw	%cx,%cx
	xorw	%bx,%bx
	movw	$0xe801,%ax
	stc
	int	$0x15
	
	jc	e801end
	
			# fix problem with some BIOSes which use ax:bx rather than cx:dx
	testw	%cx,%cx
	jnz	e801cxdx
	testw	%dx,%dx
	jnz	e801cxdx
 
	movw	%ax,%cx
	movw	%bx,%dx
	
e801cxdx:
	andl	$0xffff,%edx
	shll	$6,%edx
	andl	$0xffff,%ecx
	addl	%ecx,%edx
	addl	$0x0400,%edx  # add lower 1 MB - it's not included by e801 method
	movl	%edx,e801memorysize
e801end:
	ret
 
	#memory size in 1 kb chunks
e801memorysize:
	.long	0
 
 

Rev 264	Rev 285
1	/*	1	/*
2	* Copyright (C) 2005 Josef Cejka	2	* Copyright (C) 2005 Josef Cejka
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29		29
30	#include <arch/boot/memmapasm.h>	30	#include <arch/boot/memmapasm.h>
31		31
32	E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE	-
33	E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS	-
34	E820_SMAP = 0x534d4150	32	E820_SMAP = 0x534d4150
35		33
36	.global memmap_arch_init	34	.global memmap_arch_init
37	.global e801memorysize	35	.global e801memorysize
38		36
39	.code16	37	.code16
40	.section K_TEXT_START_2	38	.section K_TEXT_START_2
41		39
42	memmap_arch_init:	40	memmap_arch_init:
43		41
44	e820begin:	42	e820begin:
45	xorl %ebx,%ebx # during first call, ebx must be 0	43	xorl %ebx,%ebx # during first call, ebx must be 0
46	movw %bx,%ds	44	movw %bx,%ds
47	movw %bx,%es	45	movw %bx,%es
48	movw $e820table_boot,%di	46	movw $e820table_boot,%di
49	movb $E820_MAX_RECORDS,e820counter_boot	47	movb $MEMMAP_E820_MAX_RECORDS,e820counter_boot
50	e820loop:	48	e820loop:
51	movl $E820_SMAP,%edx # control sequence "SMAP"	49	movl $E820_SMAP,%edx # control sequence "SMAP"
52		50
53	movl $0x0000e820,%eax # service	51	movl $0x0000e820,%eax # service
54	movl $E820_RECORD_SIZE,%ecx	52	movl $MEMMAP_E820_RECORD_SIZE,%ecx
55	int $0x15	53	int $0x15
56	jc e820err	54	jc e820err
57		55
58	cmpl $E820_SMAP,%eax # verifying BIOS	56	cmpl $E820_SMAP,%eax # verifying BIOS
59	jne e820err	57	jne e820err
60		58
61	cmpl $E820_RECORD_SIZE,%ecx	59	cmpl $MEMMAP_E820_RECORD_SIZE,%ecx
62	jne e820err # bad record size - bug in bios	60	jne e820err # bad record size - bug in bios
63		61
64	movw %di,%ax # next record	62	movw %di,%ax # next record
65	addw $E820_RECORD_SIZE,%ax	63	addw $MEMMAP_E820_RECORD_SIZE,%ax
66	movw %ax,%di	64	movw %ax,%di
67		65
68	decb e820counter_boot # buffer is full	66	decb e820counter_boot # buffer is full
69	jz e820end	67	jz e820end
70		68
71	cmpl $0,%ebx	69	cmpl $0,%ebx
72	jne e820loop	70	jne e820loop
73		71
74	e820end:	72	e820end:
75	movb $E820_MAX_RECORDS,%al	73	movb $MEMMAP_E820_MAX_RECORDS,%al
76	subb e820counter_boot,%al	74	subb e820counter_boot,%al
77	movb %al,e820counter_boot # store # of valid entries in e820counter	75	movb %al,e820counter_boot # store # of valid entries in e820counter
78		76
79	jmp e801begin	77	jmp e801begin
80		78
81	e820err:	79	e820err:
82	movb $0,e820counter_boot	80	movb $0,e820counter_boot
83		81
84	# method e801 - get size of memory	82	# method e801 - get size of memory
85		83
86	e801begin:	84	e801begin:
87	xorw %dx,%dx	85	xorw %dx,%dx
88	xorw %cx,%cx	86	xorw %cx,%cx
89	xorw %bx,%bx	87	xorw %bx,%bx
90	movw $0xe801,%ax	88	movw $0xe801,%ax
91	stc	89	stc
92	int $0x15	90	int $0x15
93		91
94	jc e801end	92	jc e801end
95		93
96	# fix problem with some BIOSes which use ax:bx rather than cx:dx	94	# fix problem with some BIOSes which use ax:bx rather than cx:dx
97	testw %cx,%cx	95	testw %cx,%cx
98	jnz e801cxdx	96	jnz e801cxdx
99	testw %dx,%dx	97	testw %dx,%dx
100	jnz e801cxdx	98	jnz e801cxdx
101		99
102	movw %ax,%cx	100	movw %ax,%cx
103	movw %bx,%dx	101	movw %bx,%dx
104		102
105	e801cxdx:	103	e801cxdx:
106	andl $0xffff,%edx	104	andl $0xffff,%edx
107	shll $6,%edx	105	shll $6,%edx
108	andl $0xffff,%ecx	106	andl $0xffff,%ecx
109	addl %ecx,%edx	107	addl %ecx,%edx
110	addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method	108	addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method
111	movl %edx,e801memorysize	109	movl %edx,e801memorysize
112	e801end:	110	e801end:
113	ret	111	ret
114		112
115	#memory size in 1 kb chunks	113	#memory size in 1 kb chunks
116	e801memorysize:	114	e801memorysize:
117	.long 0	115	.long 0
118		116
119		117

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/boot/memmap.s @ 450 – Rev 264 → 285