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:
	cli
	call memmap_arch_init
	xorw %ax,%ax
	movw %ax,%ds
	lgdt gdtr
	movl %cr0,%eax
	orl $0x1,%eax
	movl %eax,%cr0
	jmp 0f
0:
	movw $16,%ax
	movw %ax,%es
	movw %ax,%gs
	movw %ax,%fs
	movw %ax,%ds			# kernel data + stack
        movw %ax,%ss
	movl $0x7c00,%esp
	jmpl $8,$meeting_point
meeting_point:
.code32
 
	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 105	Rev 110
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	42	cli
43	call memmap_arch_init	43	call memmap_arch_init
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	jmp 0f	50	jmp 0f
51	0:	51	0:
52	movw $16,%ax	52	movw $16,%ax
53	movw %ax,%es	53	movw %ax,%es
54	movw %ax,%gs	54	movw %ax,%gs
55	movw %ax,%fs	55	movw %ax,%fs
56	movw %ax,%ds # kernel data + stack	56	movw %ax,%ds # kernel data + stack
57	movw %ax,%ss	57	movw %ax,%ss
58	movl $0x7c00,%esp	58	movl $0x7c00,%esp
59	jmpl $8,$meeting_point	59	jmpl $8,$meeting_point
60	meeting_point:	60	meeting_point:
61	.code32	61	.code32
62		62
63	lidt idtr	63	lidt idtr
64		64
-		65	call map_kernel
-		66
-		67	movl $_hardcoded_ktext_size, hardcoded_ktext_size
-		68	movl $_hardcoded_kdata_size, hardcoded_kdata_size
-		69	movl $_hardcoded_load_address, hardcoded_load_address
-		70
-		71	call main_bsp # never returns
-		72
-		73	cli
-		74	hlt
-		75
-		76	.global map_kernel
-		77	map_kernel:
65	#	78	#
66	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	79	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
67	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	80	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
68	#	81	#
69	movl %cr4, %ecx	82	movl %cr4, %ecx
70	orl $(1<<4), %ecx	83	orl $(1<<4), %ecx
71	movl %ecx, %cr4 # turn PSE on	84	movl %ecx, %cr4 # turn PSE on
72		85
73	movl $((1<<7)\|(1<<0)), %eax	86	movl $((1<<7)\|(1<<0)), %eax
74	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	87	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
75		88
76	movl $(page_directory+(4096/2)), %edx	89	movl $(page_directory+(4096/2)), %edx
77	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	90	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
78		91
79	leal page_directory, %eax	92	leal page_directory, %eax
80	movl %eax, %cr3	93	movl %eax, %cr3
81		94
82	# turn on paging	95	# turn on paging
83	movl %cr0, %ebx	96	movl %cr0, %ebx
84	orl $(1<<31), %ebx	97	orl $(1<<31), %ebx
85	movl %ebx, %cr0	98	movl %ebx, %cr0
-		99	ret
86		100
87	movl $_hardcoded_ktext_size, hardcoded_ktext_size	-
88	movl $_hardcoded_kdata_size, hardcoded_kdata_size	-
89	movl $_hardcoded_load_address, hardcoded_load_address	-
90		-
91	call main_bsp # never returns	-
92		-
93	cli	-
94	hlt	-
95		101
96	.section K_DATA_START	102	.section K_DATA_START
97		103
98	.align 4096	104	.align 4096
99	page_directory:	105	page_directory:
100	.space 4096, 0	106	.space 4096, 0
101		107

Subversion Repositories HelenOS

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