WebSVN – HelenOS-historic – Diff – /kernel/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 bsp_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
	
	jmp protected
	
multiboot_image_start:
	movl BOOTSTRAP_OFFSET - 0x400, %esp		# initialize stack pointer
	
	lgdt gdtr								# 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
	
	call map_kernel							# map kernel and turn paging on
	
protected:
	call main_bsp		# 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 235	Rev 267
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
-		35	KDATA=16
-		36
34	.code16	37	.code16
35	#	38	#
36	# This is where we require any SPARTAN-kernel-compatible boot loader	39	# This is where we require any SPARTAN-kernel-compatible boot loader
37	# to pass control in real mode.	40	# to pass control in real mode.
38	#	41	#
39	# Protected mode tables are statically initialised during compile	42	# Protected mode tables are statically initialised during compile
40	# time. So we can just load the respective table registers and	43	# time. So we can just load the respective table registers and
41	# switch to protected mode.	44	# switch to protected mode.
42	#	45	#
43	kernel_image_start:	46	kernel_image_start:
44	cli	47	cli
45	xorw %ax, %ax	48	xorw %ax, %ax
46	movw %ax, %ds	49	movw %ax, %ds
47	movw %ax, %ss # initialize stack segment register	50	movw %ax, %ss # initialize stack segment register
48	movl $0x7c00, %esp # initialize stack pointer	51	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
49		52
50	call memmap_arch_init	53	call memmap_arch_init
51		54
52	lgdt gdtr # initialize Global Descriptor Table register	55	lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register
53		56
54	movl %cr0, %eax	57	movl %cr0, %eax
55	orl $0x1, %eax	58	orl $0x1, %eax
56	movl %eax, %cr0 # switch to protected mode	59	movl %eax, %cr0 # switch to protected mode
57		60
58	jmpl $8, $boot_image_start	61	jmpl $KTEXT, $boot_image_start
59		62
60	.code32	63	.code32
61	.align 4	64	.align 4
62	multiboot_header:	65	multiboot_header:
63	.long MULTIBOOT_HEADER_MAGIC	66	.long MULTIBOOT_HEADER_MAGIC
64	.long MULTIBOOT_HEADER_FLAGS	67	.long MULTIBOOT_HEADER_FLAGS
65	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum	68	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
66	.long multiboot_header + BOOT_OFFSET	69	.long multiboot_header + BOOT_OFFSET
67	.long unmapped_ktext_start + BOOT_OFFSET	70	.long unmapped_ktext_start + BOOT_OFFSET
68	.long 0	71	.long 0
69	.long 0	72	.long 0
70	.long multiboot_image_start + BOOT_OFFSET	73	.long multiboot_image_start + BOOT_OFFSET
71		74
72	boot_image_start:	75	boot_image_start:
73	movw $16, %ax	76	movw $KDATA, %ax
74	movw %ax, %es	77	movw %ax, %es
75	movw %ax, %gs	78	movw %ax, %gs
76	movw %ax, %fs	79	movw %ax, %fs
77	movw %ax, %ds # kernel data + stack	80	movw %ax, %ds # kernel data + stack
78	movw %ax, %ss	81	movw %ax, %ss
79		82
80	call map_kernel # map kernel and turn paging on	83	call map_kernel # map kernel and turn paging on
81		84
82	movb $0xd1, %al # enable A20 using the keyboard controller	85	movb $0xd1, %al # enable A20 using the keyboard controller
83	outb %al, $0x64	86	outb %al, $0x64
84	movb $0xdf, %al	87	movb $0xdf, %al
85	outb %al, $0x60	88	outb %al, $0x60
86		89
87	movl $0x8000, %esi	90	movl $BOOTSTRAP_OFFSET, %esi
88	movl $0x8000 + BOOT_OFFSET, %edi	91	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
89	movl $_hardcoded_kernel_size, %ecx	92	movl $_hardcoded_kernel_size, %ecx
90	cld	93	cld
91	rep movsb	94	rep movsb
92		95
93	jmp protected	96	jmp protected
94		97
95	multiboot_image_start:	98	multiboot_image_start:
96	movl $0x7c00, %esp # initialize stack pointer	99	movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
97		100
98	lgdt gdtr	101	lgdt gdtr # initialize Global Descriptor Table register
99		102
100	movw $16, %ax	103	movw $KDATA, %ax
101	movw %ax, %es	104	movw %ax, %es
102	movw %ax, %gs	105	movw %ax, %gs
103	movw %ax, %fs	106	movw %ax, %fs
104	movw %ax, %ds # kernel data + stack	107	movw %ax, %ds # kernel data + stack
105	movw %ax, %ss	108	movw %ax, %ss
106		109
107	call map_kernel # map kernel and turn paging on	110	call map_kernel # map kernel and turn paging on
108		111
109	protected:	112	protected:
110	call main_bsp # never returns	113	call main_bsp # never returns
111		114
112	cli	115	cli
113	hlt	116	hlt
114		117
115	.global map_kernel	118	.global map_kernel
116	map_kernel:	119	map_kernel:
117	#	120	#
118	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	121	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
119	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	122	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
120	#	123	#
121	movl %cr4, %ecx	124	movl %cr4, %ecx
122	orl $(1<<4), %ecx	125	orl $(1<<4), %ecx
123	movl %ecx, %cr4 # turn PSE on	126	movl %ecx, %cr4 # turn PSE on
124		127
125	movl $((1<<7)\|(1<<0)), %eax	128	movl $((1<<7)\|(1<<0)), %eax
126	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	129	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
127		130
128	movl $(page_directory+(4096/2)), %edx	131	movl $(page_directory+(4096/2)), %edx
129	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	132	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
130		133
131	leal page_directory, %eax	134	leal page_directory, %eax
132	movl %eax, %cr3	135	movl %eax, %cr3
133		136
134	# turn paging on	137	# turn paging on
135	movl %cr0, %ebx	138	movl %cr0, %ebx
136	orl $(1<<31), %ebx	139	orl $(1<<31), %ebx
137	movl %ebx, %cr0	140	movl %ebx, %cr0
138	ret	141	ret
139		142
140		143
141	.section K_DATA_START	144	.section K_DATA_START
142		145
143	.align 4096	146	.align 4096
144	page_directory:	147	page_directory:
145	.space 4096, 0	148	.space 4096, 0
146		149

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(root)/kernel/trunk/arch/ia32/src/boot/boot.S @ 1639 – Rev 235 → 267