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1 jermar 1
#
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# Copyright (C) 2001-2004 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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222 decky 29
#include <arch/boot/boot.h>
506 decky 30
#include <arch/boot/memmap.h>
300 palkovsky 31
#include <arch/mm/page.h>
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#include <arch/pm.h>
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406 jermar 34
.section K_TEXT_START, "ax"
1 jermar 35
.global kernel_image_start
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267 decky 37
KTEXT=8
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KDATA=16
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1 jermar 40
.code16
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#
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# This is where we require any SPARTAN-kernel-compatible boot loader
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# to pass control in real mode.
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#
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# Protected mode tables are statically initialised during compile
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# time. So we can just load the respective table registers and
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# switch to protected mode.
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#
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kernel_image_start:
174 jermar 50
	cli
235 decky 51
	xorw %ax, %ax
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	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
 
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	call memmap_arch_init
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323 jermar 59
	lgdt real_bootstrap_gdtr_boot					# initialize Global Descriptor Table register
177 jermar 60
 
235 decky 61
	movl %cr0, %eax
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	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
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multiboot_header:
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_FLAGS
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	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
235 decky 73
	.long multiboot_header + BOOT_OFFSET
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	.long unmapped_ktext_start + BOOT_OFFSET
222 decky 75
	.long 0
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	.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
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	movw %ax, %gs
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	movw %ax, %fs
323 jermar 84
	movw %ax, %ds							# kernel data + stack
235 decky 85
	movw %ax, %ss
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347 jermar 87
	movb $0xd1, %al							# enable A20 using i8042 controller
235 decky 88
	outb %al, $0x64
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	movb $0xdf, %al
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	outb %al, $0x60
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267 decky 92
	movl $BOOTSTRAP_OFFSET, %esi
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	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
235 decky 94
	movl $_hardcoded_kernel_size, %ecx
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	cld
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	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
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	movw %cx, %es
112
	movw %cx, %gs
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	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:
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323 jermar 120
	pushl %ebx							# save parameters from GRUB
280 decky 121
	pushl %eax
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285 decky 123
	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
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	movl $BOOTSTRAP_OFFSET, %edi
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	movl $_hardcoded_unmapped_size, %ecx
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	cld
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	rep movsb
128
 
323 jermar 129
	call map_kernel							# map kernel and turn paging on
235 decky 130
 
280 decky 131
	popl %eax
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	popl %ebx
323 jermar 133
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
280 decky 134
	je valid_boot
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285 decky 136
		xorl %ecx, %ecx							# no memory size or map available
137
		movl %ecx, e801memorysize
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		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
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149
			xorl %ecx, %ecx
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			jmp mem_invalid
151
 
152
		mem_valid:
153
		movl 4(%ebx), %ecx						# mbi->mem_lower
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		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
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162
			xorl %ecx, %ecx
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			xorl %edx, %edx
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			jmp mods_invalid
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166
		mods_valid:
628 decky 167
		movl 20(%ebx), %ecx						# mbi->mods_count
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		cmpl $0, %ecx
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		je mods_invalid
506 decky 170
 
628 decky 171
		movl 24(%ebx), %esi						# mbi->mods_addr
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		movl 0(%esi), %edx						# mods->mod_start
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		movl 4(%esi), %ecx						# mods->mod_end
174
		subl %edx, %ecx
629 decky 175
		addl $0x80000000, %edx
628 decky 176
 
506 decky 177
		mods_invalid:
628 decky 178
		movl %ecx, init_size
179
		movl %edx, init_addr
506 decky 180
 
285 decky 181
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
182
		jc mmap_valid
183
 
184
			xorl %edx, %edx
185
			jmp mmap_invalid
186
 
187
		mmap_valid:
188
		movl 44(%ebx), %ecx						# mbi->mmap_length
189
		movl 48(%ebx), %esi						# mbi->mmap_addr
190
		movl $e820table, %edi
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		xorl %edx, %edx
280 decky 192
 
285 decky 193
		mmap_loop:
194
			cmpl $0, %ecx
195
			jle mmap_end
196
 
197
			movl 4(%esi), %eax					# mmap->base_addr_low
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			movl %eax, (%edi)
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200
			movl 8(%esi), %eax					# mmap->base_addr_high
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			movl %eax, 4(%edi)
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203
			movl 12(%esi), %eax					# mmap->length_low
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			movl %eax, 8(%edi)
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206
			movl 16(%esi), %eax					# mmap->length_high
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			movl %eax, 12(%edi)
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209
			movl 20(%esi), %eax					# mmap->type
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			movl %eax, 16(%edi)
211
 
212
			movl (%esi), %eax					# mmap->size
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			addl $0x4, %eax
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			addl %eax, %esi
215
			subl %eax, %ecx
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			addl $MEMMAP_E820_RECORD_SIZE, %edi
217
			incl %edx
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			jmp mmap_loop
219
 
220
		mmap_end:
221
 
222
		mmap_invalid:
223
		movl %edx, e820counter
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280 decky 225
	invalid_boot:
226
 
323 jermar 227
	call main_bsp - BOOT_OFFSET					# never returns
110 jermar 228
 
229
	cli
230
	hlt
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232
.global map_kernel
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map_kernel:
105 jermar 234
	#
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	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 236
	# For simplicity, we map the entire 4G space.
105 jermar 237
	#
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	movl %cr4, %ecx
239
	orl $(1<<4), %ecx
323 jermar 240
	movl %ecx, %cr4							# turn PSE on
1 jermar 241
 
371 jermar 242
	movl $(page_directory+0), %esi
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	movl $(page_directory+2048), %edi
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	xorl %ecx, %ecx
245
	xorl %ebx, %ebx
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0:
105 jermar 247
	movl $((1<<7)|(1<<0)), %eax
371 jermar 248
	orl %ebx, %eax
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	movl %eax, (%esi,%ecx,4)					# mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M
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	movl %eax, (%edi,%ecx,4)					# mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M
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	addl $(4*1024*1024), %ebx
1 jermar 252
 
371 jermar 253
	incl %ecx
254
	cmpl $512, %ecx
255
	jl 0b
105 jermar 256
 
371 jermar 257
	movl %esi, %cr3
105 jermar 258
 
177 jermar 259
	# turn paging on
105 jermar 260
	movl %cr0, %ebx
261
	orl $(1<<31), %ebx
262
	movl %ebx, %cr0
110 jermar 263
	ret
105 jermar 264
 
265
 
406 jermar 266
.section K_DATA_START, "aw", @progbits
105 jermar 267
 
268
.align 4096
269
page_directory:
270
	.space 4096, 0
300 palkovsky 271
 
272
.global real_bootstrap_gdtr_boot
273
real_bootstrap_gdtr_boot:
274
	.word selector(GDT_ITEMS)
275
	.long KA2PA(gdt)-BOOT_OFFSET
314 palkovsky 276