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.
#
 
.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:
 
	call memmap_arch_init
	cli
	xorw %ax,%ax
	movw %ax,%ds
	lgdt gdtr
	movl %cr0,%eax
	orl $0x1,%eax
	movl %eax,%cr0
	jmpl $8,$meeting_point
meeting_point:
.code32
 
	movw $16,%ax
	movw %ax,%es
	movw %ax,%gs
	movw %ax,%fs
	movw %ax,%ds			# kernel data + stack
	movw %ax,%ss
	movl $0x7c00,%esp
 
	lidt idtr
 
	call map_kernel
 
	movl $_hardcoded_ktext_size, hardcoded_ktext_size
	movl $_hardcoded_kdata_size, hardcoded_kdata_size
	movl $_hardcoded_load_address, hardcoded_load_address
 
	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 on paging
	movl %cr0, %ebx
	orl $(1<<31), %ebx
	movl %ebx, %cr0
	ret
 
 
.section K_DATA_START
 
.align 4096
page_directory:
	.space 4096, 0
 

Rev 125	Rev 139
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	.section K_TEXT_START	29	.section K_TEXT_START
30	.global kernel_image_start	30	.global kernel_image_start
31		31
32	.code16	32	.code16
33	#	33	#
34	# This is where we require any SPARTAN-kernel-compatible boot loader	34	# This is where we require any SPARTAN-kernel-compatible boot loader
35	# to pass control in real mode.	35	# to pass control in real mode.
36	#	36	#
37	# Protected mode tables are statically initialised during compile	37	# Protected mode tables are statically initialised during compile
38	# time. So we can just load the respective table registers and	38	# time. So we can just load the respective table registers and
39	# switch to protected mode.	39	# switch to protected mode.
40	#	40	#
41	kernel_image_start:	41	kernel_image_start:
42	cli	-
43	call memmap_arch_init	42	call memmap_arch_init
-		43	cli
44	xorw %ax,%ax	44	xorw %ax,%ax
45	movw %ax,%ds	45	movw %ax,%ds
46	lgdt gdtr	46	lgdt gdtr
47	movl %cr0,%eax	47	movl %cr0,%eax
48	orl $0x1,%eax	48	orl $0x1,%eax
49	movl %eax,%cr0	49	movl %eax,%cr0
50	jmpl $8,$meeting_point	50	jmpl $8,$meeting_point
51	meeting_point:	51	meeting_point:
52	.code32	52	.code32
53		53
54	movw $16,%ax	54	movw $16,%ax
55	movw %ax,%es	55	movw %ax,%es
56	movw %ax,%gs	56	movw %ax,%gs
57	movw %ax,%fs	57	movw %ax,%fs
58	movw %ax,%ds # kernel data + stack	58	movw %ax,%ds # kernel data + stack
59	movw %ax,%ss	59	movw %ax,%ss
60	movl $0x7c00,%esp	60	movl $0x7c00,%esp
61		61
62	lidt idtr	62	lidt idtr
63		63
64	call map_kernel	64	call map_kernel
65		65
66	movl $_hardcoded_ktext_size, hardcoded_ktext_size	66	movl $_hardcoded_ktext_size, hardcoded_ktext_size
67	movl $_hardcoded_kdata_size, hardcoded_kdata_size	67	movl $_hardcoded_kdata_size, hardcoded_kdata_size
68	movl $_hardcoded_load_address, hardcoded_load_address	68	movl $_hardcoded_load_address, hardcoded_load_address
69		69
70	call main_bsp # never returns	70	call main_bsp # never returns
71		71
72	cli	72	cli
73	hlt	73	hlt
74		74
75	.global map_kernel	75	.global map_kernel
76	map_kernel:	76	map_kernel:
77	#	77	#
78	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	78	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
79	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	79	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
80	#	80	#
81	movl %cr4, %ecx	81	movl %cr4, %ecx
82	orl $(1<<4), %ecx	82	orl $(1<<4), %ecx
83	movl %ecx, %cr4 # turn PSE on	83	movl %ecx, %cr4 # turn PSE on
84		84
85	movl $((1<<7)\|(1<<0)), %eax	85	movl $((1<<7)\|(1<<0)), %eax
86	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	86	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
87		87
88	movl $(page_directory+(4096/2)), %edx	88	movl $(page_directory+(4096/2)), %edx
89	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	89	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
90		90
91	leal page_directory, %eax	91	leal page_directory, %eax
92	movl %eax, %cr3	92	movl %eax, %cr3
93		93
94	# turn on paging	94	# turn on paging
95	movl %cr0, %ebx	95	movl %cr0, %ebx
96	orl $(1<<31), %ebx	96	orl $(1<<31), %ebx
97	movl %ebx, %cr0	97	movl %ebx, %cr0
98	ret	98	ret
99		99
100		100
101	.section K_DATA_START	101	.section K_DATA_START
102		102
103	.align 4096	103	.align 4096
104	page_directory:	104	page_directory:
105	.space 4096, 0	105	.space 4096, 0
106		106

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/boot/boot.S – Rev 125 → 139