Subversion Repositories HelenOS

Rev

Rev 534 | Rev 629 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
#
2
# Copyright (C) 2001-2004 Jakub Jermar
3
# All rights reserved.
4
#
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions
7
# are met:
8
#
9
# - Redistributions of source code must retain the above copyright
10
#   notice, this list of conditions and the following disclaimer.
11
# - Redistributions in binary form must reproduce the above copyright
12
#   notice, this list of conditions and the following disclaimer in the
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
15
#   derived from this software without specific prior written permission.
16
#
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
19
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#
28
 
222 decky 29
#include <arch/boot/boot.h>
506 decky 30
#include <arch/boot/memmap.h>
300 palkovsky 31
#include <arch/mm/page.h>
32
#include <arch/pm.h>
222 decky 33
 
406 jermar 34
.section K_TEXT_START, "ax"
1 jermar 35
.global kernel_image_start
36
 
267 decky 37
KTEXT=8
38
KDATA=16
39
 
1 jermar 40
.code16
41
#
42
# This is where we require any SPARTAN-kernel-compatible boot loader
43
# to pass control in real mode.
44
#
45
# Protected mode tables are statically initialised during compile
46
# time. So we can just load the respective table registers and
47
# switch to protected mode.
48
#
49
kernel_image_start:
174 jermar 50
	cli
235 decky 51
	xorw %ax, %ax
52
	movw %ax, %ds
347 jermar 53
	movw %ax, %es
267 decky 54
	movw %ax, %ss							# initialize stack segment register
323 jermar 55
	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
176 jermar 56
 
57
	call memmap_arch_init
58
 
323 jermar 59
	lgdt real_bootstrap_gdtr_boot					# initialize Global Descriptor Table register
177 jermar 60
 
235 decky 61
	movl %cr0, %eax
62
	orl $0x1, %eax
267 decky 63
	movl %eax, %cr0							# switch to protected mode
235 decky 64
 
267 decky 65
	jmpl $KTEXT, $boot_image_start
235 decky 66
 
112 jermar 67
.code32
222 decky 68
.align 4
69
multiboot_header:
70
	.long MULTIBOOT_HEADER_MAGIC
71
	.long MULTIBOOT_HEADER_FLAGS
72
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
235 decky 73
	.long multiboot_header + BOOT_OFFSET
74
	.long unmapped_ktext_start + BOOT_OFFSET
222 decky 75
	.long 0
76
	.long 0
235 decky 77
	.long multiboot_image_start + BOOT_OFFSET
222 decky 78
 
235 decky 79
boot_image_start:
267 decky 80
	movw $KDATA, %ax
235 decky 81
	movw %ax, %es
82
	movw %ax, %gs
83
	movw %ax, %fs
323 jermar 84
	movw %ax, %ds							# kernel data + stack
235 decky 85
	movw %ax, %ss
86
 
347 jermar 87
	movb $0xd1, %al							# enable A20 using i8042 controller
235 decky 88
	outb %al, $0x64
89
	movb $0xdf, %al
90
	outb %al, $0x60
91
 
267 decky 92
	movl $BOOTSTRAP_OFFSET, %esi
93
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
235 decky 94
	movl $_hardcoded_kernel_size, %ecx
95
	cld
96
	rep movsb
97
 
323 jermar 98
	call map_kernel							# map kernel and turn paging on
285 decky 99
 
323 jermar 100
	call main_bsp							# never returns
279 decky 101
 
102
	cli
103
	hlt
235 decky 104
 
222 decky 105
multiboot_image_start:
323 jermar 106
	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
222 decky 107
 
323 jermar 108
	lgdt protected_bootstrap_gdtr - 0x80000000			# initialize Global Descriptor Table register
112 jermar 109
 
280 decky 110
	movw $KDATA, %cx
111
	movw %cx, %es
112
	movw %cx, %gs
113
	movw %cx, %fs
323 jermar 114
	movw %cx, %ds							# kernel data + stack
280 decky 115
	movw %cx, %ss
235 decky 116
 
279 decky 117
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
271 decky 118
	multiboot_meeting_point:
119
 
323 jermar 120
	pushl %ebx							# save parameters from GRUB
280 decky 121
	pushl %eax
122
 
285 decky 123
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
124
	movl $BOOTSTRAP_OFFSET, %edi
125
	movl $_hardcoded_unmapped_size, %ecx
126
	cld
127
	rep movsb
128
 
323 jermar 129
	call map_kernel							# map kernel and turn paging on
235 decky 130
 
280 decky 131
	popl %eax
132
	popl %ebx
323 jermar 133
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
280 decky 134
	je valid_boot
135
 
285 decky 136
		xorl %ecx, %ecx							# no memory size or map available
137
		movl %ecx, e801memorysize
138
		movl %ecx, e820counter
139
 
280 decky 140
		jmp invalid_boot
285 decky 141
 
280 decky 142
	valid_boot:
143
 
285 decky 144
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
280 decky 145
 
285 decky 146
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
147
		jc mem_valid
148
 
149
			xorl %ecx, %ecx
150
			jmp mem_invalid
151
 
152
		mem_valid:
153
		movl 4(%ebx), %ecx						# mbi->mem_lower
154
		addl 8(%ebx), %ecx						# mbi->mem_upper
280 decky 155
 
285 decky 156
		mem_invalid:
280 decky 157
		movl %ecx, e801memorysize
158
 
506 decky 159
		bt $3, %eax								# mbi->flags[3] (mods_count, mods_addr valid)	
160
		jc mods_valid
161
 
162
			xorl %ecx, %ecx
163
			xorl %edx, %edx
164
			jmp mods_invalid
165
 
166
		mods_valid:
628 decky 167
		movl 20(%ebx), %ecx						# mbi->mods_count
168
		cmpl $0, %ecx
169
		je mods_invalid
506 decky 170
 
628 decky 171
		movl 24(%ebx), %esi						# mbi->mods_addr
172
		movl 0(%esi), %edx						# mods->mod_start
173
		movl 4(%esi), %ecx						# mods->mod_end
174
		subl %edx, %ecx
175
 
506 decky 176
		mods_invalid:
628 decky 177
		movl %ecx, init_size
178
		movl %edx, init_addr
506 decky 179
 
285 decky 180
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
181
		jc mmap_valid
182
 
183
			xorl %edx, %edx
184
			jmp mmap_invalid
185
 
186
		mmap_valid:
187
		movl 44(%ebx), %ecx						# mbi->mmap_length
188
		movl 48(%ebx), %esi						# mbi->mmap_addr
189
		movl $e820table, %edi
190
		xorl %edx, %edx
280 decky 191
 
285 decky 192
		mmap_loop:
193
			cmpl $0, %ecx
194
			jle mmap_end
195
 
196
			movl 4(%esi), %eax					# mmap->base_addr_low
197
			movl %eax, (%edi)
198
 
199
			movl 8(%esi), %eax					# mmap->base_addr_high
200
			movl %eax, 4(%edi)
201
 
202
			movl 12(%esi), %eax					# mmap->length_low
203
			movl %eax, 8(%edi)
204
 
205
			movl 16(%esi), %eax					# mmap->length_high
206
			movl %eax, 12(%edi)
207
 
208
			movl 20(%esi), %eax					# mmap->type
209
			movl %eax, 16(%edi)
210
 
211
			movl (%esi), %eax					# mmap->size
212
			addl $0x4, %eax
213
			addl %eax, %esi
214
			subl %eax, %ecx
215
			addl $MEMMAP_E820_RECORD_SIZE, %edi
216
			incl %edx
217
			jmp mmap_loop
218
 
219
		mmap_end:
220
 
221
		mmap_invalid:
222
		movl %edx, e820counter
223
 
280 decky 224
	invalid_boot:
225
 
323 jermar 226
	call main_bsp - BOOT_OFFSET					# never returns
110 jermar 227
 
228
	cli
229
	hlt
230
 
231
.global map_kernel
232
map_kernel:
105 jermar 233
	#
234
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 235
	# For simplicity, we map the entire 4G space.
105 jermar 236
	#
237
	movl %cr4, %ecx
238
	orl $(1<<4), %ecx
323 jermar 239
	movl %ecx, %cr4							# turn PSE on
1 jermar 240
 
371 jermar 241
	movl $(page_directory+0), %esi
242
	movl $(page_directory+2048), %edi
243
	xorl %ecx, %ecx
244
	xorl %ebx, %ebx
245
0:
105 jermar 246
	movl $((1<<7)|(1<<0)), %eax
371 jermar 247
	orl %ebx, %eax
248
	movl %eax, (%esi,%ecx,4)					# mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M
249
	movl %eax, (%edi,%ecx,4)					# mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M
250
	addl $(4*1024*1024), %ebx
1 jermar 251
 
371 jermar 252
	incl %ecx
253
	cmpl $512, %ecx
254
	jl 0b
105 jermar 255
 
371 jermar 256
	movl %esi, %cr3
105 jermar 257
 
177 jermar 258
	# turn paging on
105 jermar 259
	movl %cr0, %ebx
260
	orl $(1<<31), %ebx
261
	movl %ebx, %cr0
110 jermar 262
	ret
105 jermar 263
 
264
 
406 jermar 265
.section K_DATA_START, "aw", @progbits
105 jermar 266
 
267
.align 4096
268
page_directory:
269
	.space 4096, 0
300 palkovsky 270
 
271
.global real_bootstrap_gdtr_boot
272
real_bootstrap_gdtr_boot:
273
	.word selector(GDT_ITEMS)
274
	.long KA2PA(gdt)-BOOT_OFFSET
314 palkovsky 275