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/memmap.h>
 
E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
E820_SMAP = 0x534d4150
 
.global memmap_arch_init
 
.code16
.section K_TEXT_START_2
 
memmap_arch_init:
	
e820begin:
	xorl	%ebx,%ebx	# during first call, ebx must be 0
	
	movw	$e820table,%di
	movb	$E820_MAX_RECORDS,(e820counter)
e820loop:	
	movl	$E820_SMAP,%edx 	# constrol sequence "SMAP"
	pushw	%ds
	popw	%es		# e820 buffer address
 
	movl	$0xe820,%eax		# service
	movl	$E820_RECORD_SIZE,%ecx
	int 	$0x15
	jc		e820end	
	
	
	cmpl	$E820_SMAP,%eax		# verifying BIOS
	jne		e820end
	
	movw	%di,%ax		# next record
	addw	$E820_RECORD_SIZE,%ax
	movw	%ax,%di
		
	decb	(e820counter) # buffer is full
	jz	e820end
	
	cmpl	$0,%ebx	
	jne	e820loop
	
e820end:
	
	movb	(e820counter),%al	
	negb	%al
	addb	$32,%al
	movb	%al,(e820counter) # store # of valid entries in e820counter
	
	ret
 
 
e820counter:
	.byte 0
		 
e820table:
	.space  (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long
 

Rev 105	Rev 110
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/memmap.h>	30	#include <arch/boot/memmap.h>
31		31
32	E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE	32	E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
33	E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS	33	E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
34	E820_SMAP = 0x534d4150	34	E820_SMAP = 0x534d4150
35		35
36	.global memmap_arch_init	36	.global memmap_arch_init
37		37
38	.code16	38	.code16
39	.section K_TEXT_START	39	.section K_TEXT_START_2
40		40
41	memmap_arch_init:	41	memmap_arch_init:
42		42
43	e820begin:	43	e820begin:
44	xorl %ebx,%ebx # during first call, ebx must be 0	44	xorl %ebx,%ebx # during first call, ebx must be 0
45		45
46	movw $e820table,%di	46	movw $e820table,%di
47	movb $E820_MAX_RECORDS,(e820counter)	47	movb $E820_MAX_RECORDS,(e820counter)
48	e820loop:	48	e820loop:
49	movl $E820_SMAP,%edx # constrol sequence "SMAP"	49	movl $E820_SMAP,%edx # constrol sequence "SMAP"
50	pushw %ds	50	pushw %ds
51	popw %es # e820 buffer address	51	popw %es # e820 buffer address
52		52
53	movl $0xe820,%eax # service	53	movl $0xe820,%eax # service
54	movl $E820_RECORD_SIZE,%ecx	54	movl $E820_RECORD_SIZE,%ecx
55	int $0x15	55	int $0x15
56	jc e820end	56	jc e820end
57		57
58		58
59	cmpl $E820_SMAP,%eax # verifying BIOS	59	cmpl $E820_SMAP,%eax # verifying BIOS
60	jne e820end	60	jne e820end
61		61
62	movw %di,%ax # next record	62	movw %di,%ax # next record
63	addw $E820_RECORD_SIZE,%ax	63	addw $E820_RECORD_SIZE,%ax
64	movw %ax,%di	64	movw %ax,%di
65		65
66	decb (e820counter) # buffer is full	66	decb (e820counter) # buffer is full
67	jz e820end	67	jz e820end
68		68
69	cmpl $0,%ebx	69	cmpl $0,%ebx
70	jne e820loop	70	jne e820loop
71		71
72	e820end:	72	e820end:
73		73
74	movb (e820counter),%al	74	movb (e820counter),%al
75	negb %al	75	negb %al
76	addb $32,%al	76	addb $32,%al
77	movb %al,(e820counter) # store # of valid entries in e820counter	77	movb %al,(e820counter) # store # of valid entries in e820counter
78		78
79	ret	79	ret
80		80
81		81
82	e820counter:	82	e820counter:
83	.byte 0	83	.byte 0
84		84
85	e820table:	85	e820table:
86	.space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long	86	.space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long
87		87

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/boot/memmap.S – Rev 105 → 110