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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>
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#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
 
267 decky 36
KTEXT=8
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KDATA=16
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112 jermar 39
.code32
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.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
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	.long multiboot_header + BOOT_OFFSET
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	.long unmapped_ktext_start + BOOT_OFFSET
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	.long 0
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	.long 0
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	.long multiboot_image_start + BOOT_OFFSET
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multiboot_image_start:
323 jermar 52
	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
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323 jermar 54
	lgdt protected_bootstrap_gdtr - 0x80000000			# initialize Global Descriptor Table register
112 jermar 55
 
280 decky 56
	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 60
	movw %cx, %ds							# kernel data + stack
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	movw %cx, %ss
235 decky 62
 
279 decky 63
	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
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	multiboot_meeting_point:
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323 jermar 66
	pushl %ebx							# save parameters from GRUB
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	pushl %eax
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285 decky 69
	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 75
	call map_kernel							# map kernel and turn paging on
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280 decky 77
	popl %eax
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	popl %ebx
323 jermar 79
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
280 decky 80
	je valid_boot
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285 decky 82
		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 86
		jmp invalid_boot
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280 decky 88
	valid_boot:
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285 decky 90
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
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285 decky 92
		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
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285 decky 102
		mem_invalid:
280 decky 103
		movl %ecx, e801memorysize
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506 decky 105
		bt $3, %eax								# mbi->flags[3] (mods_count, mods_addr valid)	
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		jc mods_valid
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			xorl %ecx, %ecx
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			xorl %edx, %edx
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			jmp mods_invalid
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		mods_valid:
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		movl 20(%ebx), %ecx						# mbi->mods_count
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		cmpl $0, %ecx
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		je mods_invalid
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628 decky 117
		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
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		subl %edx, %ecx
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		addl $0x80000000, %edx
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506 decky 123
		mods_invalid:
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		movl %ecx, init_size
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		movl %edx, init_addr
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285 decky 127
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
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		jc mmap_valid
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			xorl %edx, %edx
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			jmp mmap_invalid
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		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
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285 decky 139
		mmap_loop:
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			cmpl $0, %ecx
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			jle mmap_end
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			movl 4(%esi), %eax					# mmap->base_addr_low
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			movl %eax, (%edi)
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			movl 8(%esi), %eax					# mmap->base_addr_high
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			movl %eax, 4(%edi)
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			movl 12(%esi), %eax					# mmap->length_low
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			movl %eax, 8(%edi)
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			movl 16(%esi), %eax					# mmap->length_high
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			movl %eax, 12(%edi)
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			movl 20(%esi), %eax					# mmap->type
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			movl %eax, 16(%edi)
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158
			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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		mmap_end:
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		mmap_invalid:
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		movl %edx, e820counter
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280 decky 171
	invalid_boot:
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323 jermar 173
	call main_bsp - BOOT_OFFSET					# never returns
110 jermar 174
 
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	cli
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	hlt
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.global map_kernel
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map_kernel:
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	#
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	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 182
	# For simplicity, we map the entire 4G space.
105 jermar 183
	#
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	movl %cr4, %ecx
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	orl $(1<<4), %ecx
323 jermar 186
	movl %ecx, %cr4							# turn PSE on
1 jermar 187
 
371 jermar 188
	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 193
	movl $((1<<7)|(1<<0)), %eax
371 jermar 194
	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
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371 jermar 199
	incl %ecx
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	cmpl $512, %ecx
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	jl 0b
105 jermar 202
 
371 jermar 203
	movl %esi, %cr3
105 jermar 204
 
177 jermar 205
	# turn paging on
105 jermar 206
	movl %cr0, %ebx
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	orl $(1<<31), %ebx
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	movl %ebx, %cr0
110 jermar 209
	ret
105 jermar 210
 
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406 jermar 212
.section K_DATA_START, "aw", @progbits
105 jermar 213
 
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.align 4096
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page_directory:
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	.space 4096, 0
300 palkovsky 217
 
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.global real_bootstrap_gdtr_boot
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real_bootstrap_gdtr_boot:
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	.word selector(GDT_ITEMS)
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	.long KA2PA(gdt)-BOOT_OFFSET
314 palkovsky 222