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.
#
 
#define __ASM__
	
#include <arch/boot/boot.h>
#include <arch/boot/memmapasm.h>
#include <arch/mm/page.h>
#include <arch/pm.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_boot		# 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
	
	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 map_kernel			# map kernel and turn paging on
	
	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, %cx
	movw %cx, %es
	movw %cx, %gs
	movw %cx, %fs
	movw %cx, %ds									# kernel data + stack
	movw %cx, %ss
	
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
	multiboot_meeting_point:
	
	pushl %ebx										# save parameters from GRUB
	pushl %eax
	
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
	movl $BOOTSTRAP_OFFSET, %edi
	movl $_hardcoded_unmapped_size, %ecx
	cld
	rep movsb
	
	call map_kernel									# map kernel and turn paging on
	
	popl %eax
	popl %ebx
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
	je valid_boot
		
		xorl %ecx, %ecx							# no memory size or map available
		movl %ecx, e801memorysize
		movl %ecx, e820counter
		
		jmp invalid_boot
		
	valid_boot:
		
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
		
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
		jc mem_valid
			
			xorl %ecx, %ecx
			jmp mem_invalid
			
		mem_valid:
		movl 4(%ebx), %ecx						# mbi->mem_lower
		addl 8(%ebx), %ecx						# mbi->mem_upper
		
		mem_invalid:
		movl %ecx, e801memorysize
		
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
		jc mmap_valid
			
			xorl %edx, %edx
			jmp mmap_invalid
			
		mmap_valid:
		movl 44(%ebx), %ecx						# mbi->mmap_length
		movl 48(%ebx), %esi						# mbi->mmap_addr
		movl $e820table, %edi
		xorl %edx, %edx
		
		mmap_loop:
			cmpl $0, %ecx
			jle mmap_end
			
			movl 4(%esi), %eax					# mmap->base_addr_low
			movl %eax, (%edi)
			
			movl 8(%esi), %eax					# mmap->base_addr_high
			movl %eax, 4(%edi)
			
			movl 12(%esi), %eax					# mmap->length_low
			movl %eax, 8(%edi)
			
			movl 16(%esi), %eax					# mmap->length_high
			movl %eax, 12(%edi)
			
			movl 20(%esi), %eax					# mmap->type
			movl %eax, 16(%edi)
			
			movl (%esi), %eax					# mmap->size
			addl $0x4, %eax
			addl %eax, %esi
			subl %eax, %ecx
			addl $MEMMAP_E820_RECORD_SIZE, %edi
			incl %edx
			jmp mmap_loop
		
		mmap_end:
		
		mmap_invalid:
		movl %edx, e820counter
		
	invalid_boot:
	
	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+2048), %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
 
.global real_bootstrap_gdtr_boot
real_bootstrap_gdtr_boot:
	.word selector(GDT_ITEMS)
	.long KA2PA(gdt)-BOOT_OFFSET
	
 
Generated by GNU Enscript 1.6.6.
 
 
 

Rev 298	Rev 300
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	#define __ASM__
-		30
29	#include <arch/boot/boot.h>	31	#include <arch/boot/boot.h>
30	#include <arch/boot/memmapasm.h>	32	#include <arch/boot/memmapasm.h>
-		33	#include <arch/mm/page.h>
-		34	#include <arch/pm.h>
31		35
32	.section K_TEXT_START	36	.section K_TEXT_START
33	.global kernel_image_start	37	.global kernel_image_start
34		38
35	KTEXT=8	39	KTEXT=8
36	KDATA=16	40	KDATA=16
37		41
38	.code16	42	.code16
39	#	43	#
40	# This is where we require any SPARTAN-kernel-compatible boot loader	44	# This is where we require any SPARTAN-kernel-compatible boot loader
41	# to pass control in real mode.	45	# to pass control in real mode.
42	#	46	#
43	# Protected mode tables are statically initialised during compile	47	# Protected mode tables are statically initialised during compile
44	# time. So we can just load the respective table registers and	48	# time. So we can just load the respective table registers and
45	# switch to protected mode.	49	# switch to protected mode.
46	#	50	#
47	kernel_image_start:	51	kernel_image_start:
48	cli	52	cli
49	xorw %ax, %ax	53	xorw %ax, %ax
50	movw %ax, %ds	54	movw %ax, %ds
51	movw %ax, %ss # initialize stack segment register	55	movw %ax, %ss # initialize stack segment register
52	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer	56	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
53		57
54	call memmap_arch_init	58	call memmap_arch_init
55		59
56	lgdt real_bootstrap_gdtr # initialize Global Descriptor Table register	60	lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register
57		61
58	movl %cr0, %eax	62	movl %cr0, %eax
59	orl $0x1, %eax	63	orl $0x1, %eax
60	movl %eax, %cr0 # switch to protected mode	64	movl %eax, %cr0 # switch to protected mode
61		65
62	jmpl $KTEXT, $boot_image_start	66	jmpl $KTEXT, $boot_image_start
63		67
64	.code32	68	.code32
65	.align 4	69	.align 4
66	multiboot_header:	70	multiboot_header:
67	.long MULTIBOOT_HEADER_MAGIC	71	.long MULTIBOOT_HEADER_MAGIC
68	.long MULTIBOOT_HEADER_FLAGS	72	.long MULTIBOOT_HEADER_FLAGS
69	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum	73	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
70	.long multiboot_header + BOOT_OFFSET	74	.long multiboot_header + BOOT_OFFSET
71	.long unmapped_ktext_start + BOOT_OFFSET	75	.long unmapped_ktext_start + BOOT_OFFSET
72	.long 0	76	.long 0
73	.long 0	77	.long 0
74	.long multiboot_image_start + BOOT_OFFSET	78	.long multiboot_image_start + BOOT_OFFSET
75		79
76	boot_image_start:	80	boot_image_start:
77	movw $KDATA, %ax	81	movw $KDATA, %ax
78	movw %ax, %es	82	movw %ax, %es
79	movw %ax, %gs	83	movw %ax, %gs
80	movw %ax, %fs	84	movw %ax, %fs
81	movw %ax, %ds # kernel data + stack	85	movw %ax, %ds # kernel data + stack
82	movw %ax, %ss	86	movw %ax, %ss
83		87
84	movb $0xd1, %al # enable A20 using the keyboard controller	88	movb $0xd1, %al # enable A20 using the keyboard controller
85	outb %al, $0x64	89	outb %al, $0x64
86	movb $0xdf, %al	90	movb $0xdf, %al
87	outb %al, $0x60	91	outb %al, $0x60
88		92
89	movl $BOOTSTRAP_OFFSET, %esi	93	movl $BOOTSTRAP_OFFSET, %esi
90	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi	94	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
91	movl $_hardcoded_kernel_size, %ecx	95	movl $_hardcoded_kernel_size, %ecx
92	cld	96	cld
93	rep movsb	97	rep movsb
94		98
95	call map_kernel # map kernel and turn paging on	99	call map_kernel # map kernel and turn paging on
96		100
97	call main_bsp # never returns	101	call main_bsp # never returns
98		102
99	cli	103	cli
100	hlt	104	hlt
101		105
102	multiboot_image_start:	106	multiboot_image_start:
103	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer	107	movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer
104		108
105	lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register	109	lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register
106		110
107	movw $KDATA, %cx	111	movw $KDATA, %cx
108	movw %cx, %es	112	movw %cx, %es
109	movw %cx, %gs	113	movw %cx, %gs
110	movw %cx, %fs	114	movw %cx, %fs
111	movw %cx, %ds # kernel data + stack	115	movw %cx, %ds # kernel data + stack
112	movw %cx, %ss	116	movw %cx, %ss
113		117
114	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET	118	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
115	multiboot_meeting_point:	119	multiboot_meeting_point:
116		120
117	pushl %ebx # save parameters from GRUB	121	pushl %ebx # save parameters from GRUB
118	pushl %eax	122	pushl %eax
119		123
120	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi	124	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
121	movl $BOOTSTRAP_OFFSET, %edi	125	movl $BOOTSTRAP_OFFSET, %edi
122	movl $_hardcoded_unmapped_size, %ecx	126	movl $_hardcoded_unmapped_size, %ecx
123	cld	127	cld
124	rep movsb	128	rep movsb
125		129
126	call map_kernel # map kernel and turn paging on	130	call map_kernel # map kernel and turn paging on
127		131
128	popl %eax	132	popl %eax
129	popl %ebx	133	popl %ebx
130	cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature	134	cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature
131	je valid_boot	135	je valid_boot
132		136
133	xorl %ecx, %ecx # no memory size or map available	137	xorl %ecx, %ecx # no memory size or map available
134	movl %ecx, e801memorysize	138	movl %ecx, e801memorysize
135	movl %ecx, e820counter	139	movl %ecx, e820counter
136		140
137	jmp invalid_boot	141	jmp invalid_boot
138		142
139	valid_boot:	143	valid_boot:
140		144
141	movl (%ebx), %eax # ebx = physical address of struct multiboot_info	145	movl (%ebx), %eax # ebx = physical address of struct multiboot_info
142		146
143	bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid)	147	bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid)
144	jc mem_valid	148	jc mem_valid
145		149
146	xorl %ecx, %ecx	150	xorl %ecx, %ecx
147	jmp mem_invalid	151	jmp mem_invalid
148		152
149	mem_valid:	153	mem_valid:
150	movl 4(%ebx), %ecx # mbi->mem_lower	154	movl 4(%ebx), %ecx # mbi->mem_lower
151	addl 8(%ebx), %ecx # mbi->mem_upper	155	addl 8(%ebx), %ecx # mbi->mem_upper
152		156
153	mem_invalid:	157	mem_invalid:
154	movl %ecx, e801memorysize	158	movl %ecx, e801memorysize
155		159
156	bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid)	160	bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid)
157	jc mmap_valid	161	jc mmap_valid
158		162
159	xorl %edx, %edx	163	xorl %edx, %edx
160	jmp mmap_invalid	164	jmp mmap_invalid
161		165
162	mmap_valid:	166	mmap_valid:
163	movl 44(%ebx), %ecx # mbi->mmap_length	167	movl 44(%ebx), %ecx # mbi->mmap_length
164	movl 48(%ebx), %esi # mbi->mmap_addr	168	movl 48(%ebx), %esi # mbi->mmap_addr
165	movl $e820table, %edi	169	movl $e820table, %edi
166	xorl %edx, %edx	170	xorl %edx, %edx
167		171
168	mmap_loop:	172	mmap_loop:
169	cmpl $0, %ecx	173	cmpl $0, %ecx
170	jle mmap_end	174	jle mmap_end
171		175
172	movl 4(%esi), %eax # mmap->base_addr_low	176	movl 4(%esi), %eax # mmap->base_addr_low
173	movl %eax, (%edi)	177	movl %eax, (%edi)
174		178
175	movl 8(%esi), %eax # mmap->base_addr_high	179	movl 8(%esi), %eax # mmap->base_addr_high
176	movl %eax, 4(%edi)	180	movl %eax, 4(%edi)
177		181
178	movl 12(%esi), %eax # mmap->length_low	182	movl 12(%esi), %eax # mmap->length_low
179	movl %eax, 8(%edi)	183	movl %eax, 8(%edi)
180		184
181	movl 16(%esi), %eax # mmap->length_high	185	movl 16(%esi), %eax # mmap->length_high
182	movl %eax, 12(%edi)	186	movl %eax, 12(%edi)
183		187
184	movl 20(%esi), %eax # mmap->type	188	movl 20(%esi), %eax # mmap->type
185	movl %eax, 16(%edi)	189	movl %eax, 16(%edi)
186		190
187	movl (%esi), %eax # mmap->size	191	movl (%esi), %eax # mmap->size
188	addl $0x4, %eax	192	addl $0x4, %eax
189	addl %eax, %esi	193	addl %eax, %esi
190	subl %eax, %ecx	194	subl %eax, %ecx
191	addl $MEMMAP_E820_RECORD_SIZE, %edi	195	addl $MEMMAP_E820_RECORD_SIZE, %edi
192	incl %edx	196	incl %edx
193	jmp mmap_loop	197	jmp mmap_loop
194		198
195	mmap_end:	199	mmap_end:
196		200
197	mmap_invalid:	201	mmap_invalid:
198	movl %edx, e820counter	202	movl %edx, e820counter
199		203
200	invalid_boot:	204	invalid_boot:
201		205
202	call main_bsp - BOOT_OFFSET # never returns	206	call main_bsp - BOOT_OFFSET # never returns
203		207
204	cli	208	cli
205	hlt	209	hlt
206		210
207	.global map_kernel	211	.global map_kernel
208	map_kernel:	212	map_kernel:
209	#	213	#
210	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	214	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
211	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.	215	# For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000.
212	#	216	#
213	movl %cr4, %ecx	217	movl %cr4, %ecx
214	orl $(1<<4), %ecx	218	orl $(1<<4), %ecx
215	movl %ecx, %cr4 # turn PSE on	219	movl %ecx, %cr4 # turn PSE on
216		220
217	movl $((1<<7)\|(1<<0)), %eax	221	movl $((1<<7)\|(1<<0)), %eax
218	movl %eax, page_directory # mapping 0x00000000 => 0x00000000	222	movl %eax, page_directory # mapping 0x00000000 => 0x00000000
219		223
220	movl $(page_directory+2048), %edx	224	movl $(page_directory+2048), %edx
221	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000	225	movl %eax, (%edx) # mapping 0x80000000 => 0x00000000
222		226
223	leal page_directory, %eax	227	leal page_directory, %eax
224	movl %eax, %cr3	228	movl %eax, %cr3
225		229
226	# turn paging on	230	# turn paging on
227	movl %cr0, %ebx	231	movl %cr0, %ebx
228	orl $(1<<31), %ebx	232	orl $(1<<31), %ebx
229	movl %ebx, %cr0	233	movl %ebx, %cr0
230	ret	234	ret
231		235
232		236
233	.section K_DATA_START	237	.section K_DATA_START
234		238
235	.align 4096	239	.align 4096
236	page_directory:	240	page_directory:
237	.space 4096, 0	241	.space 4096, 0
-		242
-		243	.global real_bootstrap_gdtr_boot
-		244	real_bootstrap_gdtr_boot:
-		245	.word selector(GDT_ITEMS)
-		246	.long KA2PA(gdt)-BOOT_OFFSET
-		247
238		248
-		249	Generated by GNU Enscript 1.6.6.
-		250
-		251
-		252

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