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multiboot_image_start:
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multiboot_image_start:
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	movl $BOOTSTRAP_OFFSET - 0x400, %esp			# initialize stack pointer
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	movl $BOOTSTRAP_OFFSET - 0x400, %esp			# initialize stack pointer
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	lgdt protected_bootstrap_gdtr - 0x80000000		# initialize Global Descriptor Table register
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	lgdt protected_bootstrap_gdtr - 0x80000000		# initialize Global Descriptor Table register
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	movw $KDATA, %ax
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	movw $KDATA, %cx
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	movw %ax, %es
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	movw %cx, %es
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	movw %ax, %gs
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	movw %cx, %gs
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	movw %ax, %fs
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	movw %cx, %fs
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	movw %ax, %ds									# kernel data + stack
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	movw %cx, %ds									# kernel data + stack
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	movw %ax, %ss
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	movw %cx, %ss
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	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
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	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
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	multiboot_meeting_point:
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	multiboot_meeting_point:
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	pushl %ebx
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	pushl %eax
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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 %ebx
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax
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	je valid_boot
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		# ...
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		jmp invalid_boot
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	valid_boot:
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		movl (%ebx), %eax
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		# ... check flags in eax
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		movl 4(%ebx), %ecx
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		addl 8(%ebx), %ecx
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		movl %ecx, e801memorysize
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#		movl 44(%ebx), %ecx
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		xorl %ecx, %ecx
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		movl %ecx, e820counter
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#		movl 48(%ebx), %esi
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#		movl $e820table, %edi
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#		cld
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#		rep movsb
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	invalid_boot:
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	call main_bsp - BOOT_OFFSET						# never returns
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	call main_bsp - BOOT_OFFSET						# never returns
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	cli
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	cli
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	hlt
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	hlt
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