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	$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
	
	testl	%ebx,%ebx	
	jnz	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
 
 
.section K_DATA_START
 
#memory size in 1 kb chunks
e801memorysize:
	.long	0
 
 

Rev 285	Rev 347
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_SMAP = 0x534d4150	32	E820_SMAP = 0x534d4150
33		33
34	.global memmap_arch_init	34	.global memmap_arch_init
35	.global e801memorysize	35	.global e801memorysize
36		36
37	.code16	37	.code16
38	.section K_TEXT_START_2	38	.section K_TEXT_START_2
39		39
40	memmap_arch_init:	40	memmap_arch_init:
41		-
42	e820begin:	41	e820begin:
43	xorl %ebx,%ebx # during first call, ebx must be 0	42	xorl %ebx,%ebx # during first call, ebx must be 0
44	movw %bx,%ds	-
45	movw %bx,%es	-
46	movw $e820table_boot,%di	43	movw $e820table_boot,%di
47	movb $MEMMAP_E820_MAX_RECORDS,e820counter_boot	44	movb $MEMMAP_E820_MAX_RECORDS,e820counter_boot
48	e820loop:	45	e820loop:
49	movl $E820_SMAP,%edx # control sequence "SMAP"	46	movl $E820_SMAP,%edx # control sequence "SMAP"
50		47
51	movl $0x0000e820,%eax # service	48	movl $0x0000e820,%eax # service
52	movl $MEMMAP_E820_RECORD_SIZE,%ecx	49	movl $MEMMAP_E820_RECORD_SIZE,%ecx
53	int $0x15	50	int $0x15
54	jc e820err	51	jc e820err
55		52
56	cmpl $E820_SMAP,%eax # verifying BIOS	53	cmpl $E820_SMAP,%eax # verifying BIOS
57	jne e820err	54	jne e820err
58		55
59	cmpl $MEMMAP_E820_RECORD_SIZE,%ecx	56	cmpl $MEMMAP_E820_RECORD_SIZE,%ecx
60	jne e820err # bad record size - bug in bios	57	jne e820err # bad record size - bug in bios
61		58
62	movw %di,%ax # next record	59	movw %di,%ax # next record
63	addw $MEMMAP_E820_RECORD_SIZE,%ax	60	addw $MEMMAP_E820_RECORD_SIZE,%ax
64	movw %ax,%di	61	movw %ax,%di
65		62
66	decb e820counter_boot # buffer is full	63	decb e820counter_boot # buffer is full
67	jz e820end	64	jz e820end
68		65
69	cmpl $0,%ebx	66	testl %ebx,%ebx
70	jne e820loop	67	jnz e820loop
71		68
72	e820end:	69	e820end:
73	movb $MEMMAP_E820_MAX_RECORDS,%al	70	movb $MEMMAP_E820_MAX_RECORDS,%al
74	subb e820counter_boot,%al	71	subb e820counter_boot,%al
75	movb %al,e820counter_boot # store # of valid entries in e820counter	72	movb %al,e820counter_boot # store # of valid entries in e820counter
76		73
77	jmp e801begin	74	jmp e801begin
78		75
79	e820err:	76	e820err:
80	movb $0,e820counter_boot	77	movb $0,e820counter_boot
81		78
82	# method e801 - get size of memory	79	# method e801 - get size of memory
83		80
84	e801begin:	81	e801begin:
85	xorw %dx,%dx	82	xorw %dx,%dx
86	xorw %cx,%cx	83	xorw %cx,%cx
87	xorw %bx,%bx	84	xorw %bx,%bx
88	movw $0xe801,%ax	85	movw $0xe801,%ax
89	stc	86	stc
90	int $0x15	87	int $0x15
91		88
92	jc e801end	89	jc e801end
93		90
94	# fix problem with some BIOSes which use ax:bx rather than cx:dx	91	# fix problem with some BIOSes which use ax:bx rather than cx:dx
95	testw %cx,%cx	92	testw %cx,%cx
96	jnz e801cxdx	93	jnz e801cxdx
97	testw %dx,%dx	94	testw %dx,%dx
98	jnz e801cxdx	95	jnz e801cxdx
99		96
100	movw %ax,%cx	97	movw %ax,%cx
101	movw %bx,%dx	98	movw %bx,%dx
102		99
103	e801cxdx:	100	e801cxdx:
104	andl $0xffff,%edx	101	andl $0xffff,%edx
105	shll $6,%edx	102	shll $6,%edx
106	andl $0xffff,%ecx	103	andl $0xffff,%ecx
107	addl %ecx,%edx	104	addl %ecx,%edx
108	addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method	105	addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method
109	movl %edx,e801memorysize	106	movl %edx,e801memorysize
110	e801end:	107	e801end:
111	ret	108	ret
112		109
-		110
-		111	.section K_DATA_START
-		112
113	#memory size in 1 kb chunks	113	#memory size in 1 kb chunks
114	e801memorysize:	114	e801memorysize:
115	.long 0	115	.long 0
116		-
117		116

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/boot/memmap.S – Rev 285 → 347