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Rev 1806 Rev 1809
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	.ascii  "HYPERCALL_PAGE=0x2,"
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	.ascii  "HYPERCALL_PAGE=0x2,"
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	.ascii  "LOADER=generic,"
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	.ascii  "LOADER=generic,"
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	.ascii  "PT_MODE_WRITABLE"
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	.ascii  "PT_MODE_WRITABLE"
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	.byte   0
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	.byte   0
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#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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.section K_TEXT_START, "ax"
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.section K_TEXT_START, "ax"
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KTEXT=8
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KTEXT=8
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KDATA=16
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KDATA=16
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.code32
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.code32
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.align 4
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.align 4
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.global multiboot_image_start
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.global kernel_image_start
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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
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	.long unmapped_ktext_start
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	.long 0
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	.long 0
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	.long multiboot_image_start
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multiboot_image_start:
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kernel_image_start:
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	movl $START_STACK, %esp			# initialize stack pointer
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	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
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	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
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	movw $KDATA, %cx
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	movw $KDATA, %cx
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	movw %cx, %es
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	movw %cx, %es
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	movw %cx, %fs
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	movw %cx, %fs
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	call map_kernel							# map kernel and turn paging on
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	call map_kernel							# map kernel and turn paging on
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	popl %eax
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	popl %eax
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	popl %ebx
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	popl %ebx
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
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	je valid_boot
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		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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		jmp invalid_boot
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	valid_boot:
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		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
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		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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		mem_invalid:
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		movl %ecx, e801memorysize
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		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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			movl %ecx, init
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			jmp mods_end
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		mods_valid:
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		movl 20(%ebx), %ecx						# mbi->mods_count
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		movl %ecx, init
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		cmpl $0, %ecx
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		je mods_end
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		movl 24(%ebx), %esi						# mbi->mods_addr
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		movl $init, %edi
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		mods_loop:
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			movl 0(%esi), %edx					# mods->mod_start
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			addl $0x80000000, %edx
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			movl %edx, 4(%edi)
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			movl 4(%esi), %edx
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			subl 0(%esi), %edx					# mods->mod_end - mods->mod_start
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			movl %edx, 8(%edi)
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			addl $16, %esi
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			addl $8	, %edi
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			loop mods_loop
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		mods_end:
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	invalid_boot:
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#ifdef CONFIG_SMP
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	# copy AP bootstrap routines below 1 MB
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	movl $BOOT_OFFSET, %esi
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	movl $AP_BOOT_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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#endif
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	call main_bsp								# never returns
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	call main_bsp								# never returns
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	cli
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	cli
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	hlt
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	hlt