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


#
# Copyright (C) 2001-2004 Jakub Jermar
# 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/boot.h>
 
.section K_TEXT_START
.global kernel_image_start
 
KTEXT=8
KDATA=16
 
.code16
#
# This is where we require any SPARTAN-kernel-compatible boot loader
# to pass control in real mode.
#
# Protected mode tables are statically initialised during compile
# time. So we can just load the respective table registers and
# switch to protected mode.
#
kernel_image_start:
	cli
	xorw %ax, %ax
	movw %ax, %ds
	movw %ax, %ss							# initialize stack segment register
	movl $BOOTSTRAP_OFFSET - 0x400, %esp	# initialize stack pointer
	
	call memmap_arch_init
	
	lgdt real_bootstrap_gdtr				# initialize Global Descriptor Table register
	
	movl %cr0, %eax
	orl $0x1, %eax
	movl %eax, %cr0							# switch to protected mode
	
	jmpl $KTEXT, $boot_image_start
	
.code32
.align 4
multiboot_header:
	.long MULTIBOOT_HEADER_MAGIC
	.long MULTIBOOT_HEADER_FLAGS
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
	.long multiboot_header + BOOT_OFFSET
	.long unmapped_ktext_start + BOOT_OFFSET
	.long 0
	.long 0
	.long multiboot_image_start + BOOT_OFFSET
	
boot_image_start:
	movw $KDATA, %ax
	movw %ax, %es
	movw %ax, %gs
	movw %ax, %fs
	movw %ax, %ds			# kernel data + stack
	movw %ax, %ss
	
	call map_kernel			# map kernel and turn paging on
	
	movb $0xd1, %al			# enable A20 using the keyboard controller
	outb %al, $0x64
	movb $0xdf, %al
	outb %al, $0x60
	
	movl $BOOTSTRAP_OFFSET, %esi
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
	movl $_hardcoded_kernel_size, %ecx
	cld
	rep movsb
	
	call main_bsp			# never returns
 
	cli
	hlt
	
multiboot_image_start:
	movl $BOOTSTRAP_OFFSET - 0x400, %esp			# initialize stack pointer
	
	lgdt protected_bootstrap_gdtr - 0x80000000		# initialize Global Descriptor Table register
 
	movw $KDATA, %ax
	movw %ax, %es
	movw %ax, %gs
	movw %ax, %fs
	movw %ax, %ds									# kernel data + stack
	movw %ax, %ss
	
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
	multiboot_meeting_point:
	
	call map_kernel									# map kernel and turn paging on
	
 
	call main_bsp - BOOT_OFFSET						# never returns
 
	cli
	hlt
 
.global map_kernel
map_kernel:
	#
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
	#
	movl %cr4, %ecx
	orl $(1<<4), %ecx
	movl %ecx, %cr4				# turn PSE on
	
	movl $((1<<7)|(1<<0)), %eax
	movl %eax, page_directory		# mapping 0x00000000 => 0x00000000
 
	movl $(page_directory+(4096/2)), %edx
	movl %eax, (%edx)			# mapping 0x80000000 => 0x00000000
 
	leal page_directory, %eax
	movl %eax, %cr3
	
	# turn paging on
	movl %cr0, %ebx
	orl $(1<<31), %ebx
	movl %ebx, %cr0
	ret
 
 
.section K_DATA_START
 
.align 4096
page_directory:
	.space 4096, 0
 

Rev 271	Rev 279
1	#	1	#
2	# Copyright (C) 2001-2004 Jakub Jermar	2	# Copyright (C) 2001-2004 Jakub Jermar
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	#include <arch/boot/boot.h>	29	#include <arch/boot/boot.h>
30		30
31	.section K_TEXT_START	31	.section K_TEXT_START
32	.global kernel_image_start	32	.global kernel_image_start
33		33
34	KTEXT=8	34	KTEXT=8
35	KDATA=16	35	KDATA=16
36		36
37	.code16	37	.code16
38	#	38	#
39	# This is where we require any SPARTAN-kernel-compatible boot loader	39	# This is where we require any SPARTAN-kernel-compatible boot loader
40	# to pass control in real mode.	40	# to pass control in real mode.
41	#	41	#
42	# Protected mode tables are statically initialised during compile	42	# Protected mode tables are statically initialised during compile
43	# time. So we can just load the respective table registers and	43	# time. So we can just load the respective table registers and
44	# switch to protected mode.	44	# switch to protected mode.
45	#	45	#
46	kernel_image_start:	46	kernel_image_start:
47	cli	47	cli
48	xorw %ax, %ax	48	xorw %ax, %ax
49	movw %ax, %ds	49	movw %ax, %ds
50	movw %ax, %ss # initialize stack segment register	50	movw %ax, %ss # initialize stack segment register
51	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer	51	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
52		52
53	call memmap_arch_init	53	call memmap_arch_init
54		54
55	lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register	55	lgdt real_bootstrap_gdtr # initialize Global Descriptor Table register
56		56
57	movl %cr0, %eax	57	movl %cr0, %eax
58	orl $0x1, %eax	58	orl $0x1, %eax
59	movl %eax, %cr0 # switch to protected mode	59	movl %eax, %cr0 # switch to protected mode
60		60
61	jmpl $KTEXT, $boot_image_start	61	jmpl $KTEXT, $boot_image_start
62		62
63	.code32	63	.code32
64	.align 4	64	.align 4
65	multiboot_header:	65	multiboot_header:
66	.long MULTIBOOT_HEADER_MAGIC	66	.long MULTIBOOT_HEADER_MAGIC
67	.long MULTIBOOT_HEADER_FLAGS	67	.long MULTIBOOT_HEADER_FLAGS
68	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum	68	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
69	.long multiboot_header + BOOT_OFFSET	69	.long multiboot_header + BOOT_OFFSET
70	.long unmapped_ktext_start + BOOT_OFFSET	70	.long unmapped_ktext_start + BOOT_OFFSET
71	.long 0	71	.long 0
72	.long 0	72	.long 0
73	.long multiboot_image_start + BOOT_OFFSET	73	.long multiboot_image_start + BOOT_OFFSET
74		74
75	boot_image_start:	75	boot_image_start:
76	movw $KDATA, %ax	76	movw $KDATA, %ax
77	movw %ax, %es	77	movw %ax, %es
78	movw %ax, %gs	78	movw %ax, %gs
79	movw %ax, %fs	79	movw %ax, %fs
80	movw %ax, %ds # kernel data + stack	80	movw %ax, %ds # kernel data + stack
81	movw %ax, %ss	81	movw %ax, %ss
82		82
83	call map_kernel # map kernel and turn paging on	83	call map_kernel # map kernel and turn paging on
84		84
85	movb $0xd1, %al # enable A20 using the keyboard controller	85	movb $0xd1, %al # enable A20 using the keyboard controller
86	outb %al, $0x64	86	outb %al, $0x64
87	movb $0xdf, %al	87	movb $0xdf, %al
88	outb %al, $0x60	88	outb %al, $0x60
89		89
90	movl $BOOTSTRAP_OFFSET, %esi	90	movl $BOOTSTRAP_OFFSET, %esi
91	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi	91	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
92	movl $_hardcoded_kernel_size, %ecx	92	movl $_hardcoded_kernel_size, %ecx
93	cld	93	cld
94	rep movsb	94	rep movsb
95		95
96	jmp protected	96	call main_bsp # never returns
-		97
-		98	cli
-		99	hlt
97		100
98	multiboot_image_start:	101	multiboot_image_start:
99	movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer	102	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
100		103
101	lgdt gdtr # initialize Global Descriptor Table register	104	lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register
102		105
103	movw $KDATA, %ax	106	movw $KDATA, %ax
104	movw %ax, %es	107	movw %ax, %es
105	movw %ax, %gs	108	movw %ax, %gs
106	movw %ax, %fs	109	movw %ax, %fs
107	movw %ax, %ds # kernel data + stack	110	movw %ax, %ds # kernel data + stack
108	movw %ax, %ss	111	movw %ax, %ss
109		112
110	jmpl $KTEXT, $multiboot_meeting_point	113	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
111	multiboot_meeting_point:	114	multiboot_meeting_point:
112		115
113	call map_kernel # map kernel and turn paging on	116	call map_kernel # map kernel and turn paging on
114		117
115	protected:	-
116	call main_bsp # never returns	118	call main_bsp - BOOT_OFFSET # never returns
117		119
118	cli	120	cli
119	hlt	121	hlt
120		122
121	.global map_kernel	123	.global map_kernel
122	map_kernel:	124	map_kernel:
123	#	125	#
124	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	126	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
125	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	127	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
126	#	128	#
127	movl %cr4, %ecx	129	movl %cr4, %ecx
128	orl $(1<<4), %ecx	130	orl $(1<<4), %ecx
129	movl %ecx, %cr4 # turn PSE on	131	movl %ecx, %cr4 # turn PSE on
130		132
131	movl $((1<<7)\|(1<<0)), %eax	133	movl $((1<<7)\|(1<<0)), %eax
132	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	134	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
133		135
134	movl $(page_directory+(4096/2)), %edx	136	movl $(page_directory+(4096/2)), %edx
135	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	137	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
136		138
137	leal page_directory, %eax	139	leal page_directory, %eax
138	movl %eax, %cr3	140	movl %eax, %cr3
139		141
140	# turn paging on	142	# turn paging on
141	movl %cr0, %ebx	143	movl %cr0, %ebx
142	orl $(1<<31), %ebx	144	orl $(1<<31), %ebx
143	movl %ebx, %cr0	145	movl %ebx, %cr0
144	ret	146	ret
145		147
146		148
147	.section K_DATA_START	149	.section K_DATA_START
148		150
149	.align 4096	151	.align 4096
150	page_directory:	152	page_directory:
151	.space 4096, 0	153	.space 4096, 0
152		154

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/boot/boot.S @ 347 – Rev 271 → 279