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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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300 palkovsky 29
#define __ASM__
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222 decky 31
#include <arch/boot/boot.h>
285 decky 32
#include <arch/boot/memmapasm.h>
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#include <arch/mm/page.h>
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#include <arch/pm.h>
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406 jermar 36
.section K_TEXT_START, "ax"
1 jermar 37
.global kernel_image_start
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267 decky 39
KTEXT=8
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KDATA=16
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1 jermar 42
.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 52
	cli
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	xorw %ax, %ax
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	movw %ax, %ds
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	movw %ax, %es
267 decky 56
	movw %ax, %ss							# initialize stack segment register
323 jermar 57
	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
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	call memmap_arch_init
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323 jermar 61
	lgdt real_bootstrap_gdtr_boot					# initialize Global Descriptor Table register
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235 decky 63
	movl %cr0, %eax
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	orl $0x1, %eax
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	movl %eax, %cr0							# switch to protected mode
235 decky 66
 
267 decky 67
	jmpl $KTEXT, $boot_image_start
235 decky 68
 
112 jermar 69
.code32
222 decky 70
.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 75
	.long multiboot_header + BOOT_OFFSET
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	.long unmapped_ktext_start + BOOT_OFFSET
222 decky 77
	.long 0
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	.long 0
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	.long multiboot_image_start + BOOT_OFFSET
222 decky 80
 
235 decky 81
boot_image_start:
267 decky 82
	movw $KDATA, %ax
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	movw %ax, %es
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	movw %ax, %gs
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	movw %ax, %fs
323 jermar 86
	movw %ax, %ds							# kernel data + stack
235 decky 87
	movw %ax, %ss
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347 jermar 89
	movb $0xd1, %al							# enable A20 using i8042 controller
235 decky 90
	outb %al, $0x64
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	movb $0xdf, %al
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	outb %al, $0x60
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267 decky 94
	movl $BOOTSTRAP_OFFSET, %esi
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	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
235 decky 96
	movl $_hardcoded_kernel_size, %ecx
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	cld
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	rep movsb
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323 jermar 100
	call map_kernel							# map kernel and turn paging on
285 decky 101
 
323 jermar 102
	call main_bsp							# never returns
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104
	cli
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	hlt
235 decky 106
 
222 decky 107
multiboot_image_start:
323 jermar 108
	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
222 decky 109
 
323 jermar 110
	lgdt protected_bootstrap_gdtr - 0x80000000			# initialize Global Descriptor Table register
112 jermar 111
 
280 decky 112
	movw $KDATA, %cx
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	movw %cx, %es
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	movw %cx, %gs
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	movw %cx, %fs
323 jermar 116
	movw %cx, %ds							# kernel data + stack
280 decky 117
	movw %cx, %ss
235 decky 118
 
279 decky 119
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
271 decky 120
	multiboot_meeting_point:
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323 jermar 122
	pushl %ebx							# save parameters from GRUB
280 decky 123
	pushl %eax
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285 decky 125
	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
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323 jermar 131
	call map_kernel							# map kernel and turn paging on
235 decky 132
 
280 decky 133
	popl %eax
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	popl %ebx
323 jermar 135
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
280 decky 136
	je valid_boot
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285 decky 138
		xorl %ecx, %ecx							# no memory size or map available
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		movl %ecx, e801memorysize
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		movl %ecx, e820counter
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280 decky 142
		jmp invalid_boot
285 decky 143
 
280 decky 144
	valid_boot:
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285 decky 146
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
280 decky 147
 
285 decky 148
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
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		jc mem_valid
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			xorl %ecx, %ecx
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			jmp mem_invalid
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		mem_valid:
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		movl 4(%ebx), %ecx						# mbi->mem_lower
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		addl 8(%ebx), %ecx						# mbi->mem_upper
280 decky 157
 
285 decky 158
		mem_invalid:
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		movl %ecx, e801memorysize
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285 decky 161
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
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		jc mmap_valid
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164
			xorl %edx, %edx
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			jmp mmap_invalid
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167
		mmap_valid:
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		movl 44(%ebx), %ecx						# mbi->mmap_length
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		movl 48(%ebx), %esi						# mbi->mmap_addr
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		movl $e820table, %edi
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		xorl %edx, %edx
280 decky 172
 
285 decky 173
		mmap_loop:
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			cmpl $0, %ecx
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			jle mmap_end
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177
			movl 4(%esi), %eax					# mmap->base_addr_low
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			movl %eax, (%edi)
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180
			movl 8(%esi), %eax					# mmap->base_addr_high
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			movl %eax, 4(%edi)
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183
			movl 12(%esi), %eax					# mmap->length_low
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			movl %eax, 8(%edi)
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186
			movl 16(%esi), %eax					# mmap->length_high
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			movl %eax, 12(%edi)
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189
			movl 20(%esi), %eax					# mmap->type
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			movl %eax, 16(%edi)
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192
			movl (%esi), %eax					# mmap->size
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			addl $0x4, %eax
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			addl %eax, %esi
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			subl %eax, %ecx
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			addl $MEMMAP_E820_RECORD_SIZE, %edi
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			incl %edx
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			jmp mmap_loop
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200
		mmap_end:
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202
		mmap_invalid:
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		movl %edx, e820counter
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280 decky 205
	invalid_boot:
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323 jermar 207
	call main_bsp - BOOT_OFFSET					# never returns
110 jermar 208
 
209
	cli
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	hlt
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212
.global map_kernel
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map_kernel:
105 jermar 214
	#
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	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 216
	# For simplicity, we map the entire 4G space.
105 jermar 217
	#
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	movl %cr4, %ecx
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	orl $(1<<4), %ecx
323 jermar 220
	movl %ecx, %cr4							# turn PSE on
1 jermar 221
 
371 jermar 222
	movl $(page_directory+0), %esi
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	movl $(page_directory+2048), %edi
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	xorl %ecx, %ecx
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	xorl %ebx, %ebx
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0:
105 jermar 227
	movl $((1<<7)|(1<<0)), %eax
371 jermar 228
	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 232
 
371 jermar 233
	incl %ecx
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	cmpl $512, %ecx
235
	jl 0b
105 jermar 236
 
371 jermar 237
	movl %esi, %cr3
105 jermar 238
 
177 jermar 239
	# turn paging on
105 jermar 240
	movl %cr0, %ebx
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	orl $(1<<31), %ebx
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	movl %ebx, %cr0
110 jermar 243
	ret
105 jermar 244
 
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406 jermar 246
.section K_DATA_START, "aw", @progbits
105 jermar 247
 
248
.align 4096
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page_directory:
250
	.space 4096, 0
300 palkovsky 251
 
252
.global real_bootstrap_gdtr_boot
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real_bootstrap_gdtr_boot:
254
	.word selector(GDT_ITEMS)
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	.long KA2PA(gdt)-BOOT_OFFSET
314 palkovsky 256