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
 
.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 $0x7c00,%esp		# initialize stack pointer
	
	call memmap_arch_init
	
	lgdt gdtr			# initialize Global Descriptor Table register
	lidt idtr			# initialize Interrupt Descriptor Table register
	
	movl %cr0,%eax
	orl $0x1,%eax
	movl %eax,%cr0			# switch to protected mode
	jmpl $8,$meeting_point
 
.code32
.align 4
multiboot_header:
	.long MULTIBOOT_HEADER_MAGIC
	.long MULTIBOOT_HEADER_FLAGS
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
	.long multiboot_header
	.long unmapped_ktext_start
	.long 0
	.long 0
	.long multiboot_image_start
	
multiboot_image_start:
	movl $0x7c00, %esp		# initialize stack pointer
	
	lgdt gdtr
	lidt idtr
 
meeting_point:
	movw $16,%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
 
	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 216	Rev 222
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>
-		30
29	.section K_TEXT_START	31	.section K_TEXT_START
30	.global kernel_image_start	32	.global kernel_image_start
31		33
32	.code16	34	.code16
33	#	35	#
34	# This is where we require any SPARTAN-kernel-compatible boot loader	36	# This is where we require any SPARTAN-kernel-compatible boot loader
35	# to pass control in real mode.	37	# to pass control in real mode.
36	#	38	#
37	# Protected mode tables are statically initialised during compile	39	# Protected mode tables are statically initialised during compile
38	# time. So we can just load the respective table registers and	40	# time. So we can just load the respective table registers and
39	# switch to protected mode.	41	# switch to protected mode.
40	#	42	#
41	kernel_image_start:	43	kernel_image_start:
42	cli	44	cli
43	xorw %ax,%ax	45	xorw %ax,%ax
44	movw %ax,%ds	46	movw %ax,%ds
45	movw %ax,%ss # initialize stack segment register	47	movw %ax,%ss # initialize stack segment register
46	movl $0x7c00,%esp # initialize stack pointer	48	movl $0x7c00,%esp # initialize stack pointer
47		49
48	call memmap_arch_init	50	call memmap_arch_init
49		51
50	lgdt gdtr # initialize Global Descriptor Table register	52	lgdt gdtr # initialize Global Descriptor Table register
51	lidt idtr # initialize Interrupt Descriptor Table register	53	lidt idtr # initialize Interrupt Descriptor Table register
52		54
53	movl %cr0,%eax	55	movl %cr0,%eax
54	orl $0x1,%eax	56	orl $0x1,%eax
55	movl %eax,%cr0 # switch to protected mode	57	movl %eax,%cr0 # switch to protected mode
56	jmpl $8,$meeting_point	58	jmpl $8,$meeting_point
57	meeting_point:	59
58	.code32	60	.code32
-		61	.align 4
-		62	multiboot_header:
-		63	.long MULTIBOOT_HEADER_MAGIC
-		64	.long MULTIBOOT_HEADER_FLAGS
-		65	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
-		66	.long multiboot_header
-		67	.long unmapped_ktext_start
-		68	.long 0
-		69	.long 0
-		70	.long multiboot_image_start
-		71
-		72	multiboot_image_start:
-		73	movl $0x7c00, %esp # initialize stack pointer
-		74
-		75	lgdt gdtr
-		76	lidt idtr
59		77
-		78	meeting_point:
60	movw $16,%ax	79	movw $16,%ax
61	movw %ax,%es	80	movw %ax,%es
62	movw %ax,%gs	81	movw %ax,%gs
63	movw %ax,%fs	82	movw %ax,%fs
64	movw %ax,%ds # kernel data + stack	83	movw %ax,%ds # kernel data + stack
65	movw %ax,%ss	84	movw %ax,%ss
66		85
67	call map_kernel # map kernel and turn paging on	86	call map_kernel # map kernel and turn paging on
68		87
69	call main_bsp # never returns	88	call main_bsp # never returns
70		89
71	cli	90	cli
72	hlt	91	hlt
73		92
74	.global map_kernel	93	.global map_kernel
75	map_kernel:	94	map_kernel:
76	#	95	#
77	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	96	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
78	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	97	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
79	#	98	#
80	movl %cr4, %ecx	99	movl %cr4, %ecx
81	orl $(1<<4), %ecx	100	orl $(1<<4), %ecx
82	movl %ecx, %cr4 # turn PSE on	101	movl %ecx, %cr4 # turn PSE on
83		102
84	movl $((1<<7)\|(1<<0)), %eax	103	movl $((1<<7)\|(1<<0)), %eax
85	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	104	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
86		105
87	movl $(page_directory+(4096/2)), %edx	106	movl $(page_directory+(4096/2)), %edx
88	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	107	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
89		108
90	leal page_directory, %eax	109	leal page_directory, %eax
91	movl %eax, %cr3	110	movl %eax, %cr3
92		111
93	# turn paging on	112	# turn paging on
94	movl %cr0, %ebx	113	movl %cr0, %ebx
95	orl $(1<<31), %ebx	114	orl $(1<<31), %ebx
96	movl %ebx, %cr0	115	movl %ebx, %cr0
97	ret	116	ret
98		117
99		118
100	.section K_DATA_START	119	.section K_DATA_START
101		120
102	.align 4096	121	.align 4096
103	page_directory:	122	page_directory:
104	.space 4096, 0	123	.space 4096, 0
105		124

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/boot/boot.S @ 1639 – Rev 216 → 222