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# time. So we can just load the respective table registers and
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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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# switch to protected mode.
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#
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#
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kernel_image_start:
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kernel_image_start:
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	cli
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	cli
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	xorw %ax,%ax
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	xorw %ax, %ax
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	movw %ax,%ds
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	movw %ax, %ds
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	movw %ax,%ss			# initialize stack segment register
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	movw %ax, %ss			# initialize stack segment register
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	movl $0x7c00,%esp		# initialize stack pointer
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	movl $0x7c00, %esp		# initialize stack pointer
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	call memmap_arch_init
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	call memmap_arch_init
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	lgdt gdtr			# initialize Global Descriptor Table register
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	lgdt gdtr			# initialize Global Descriptor Table register
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	movl %cr0,%eax
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	movl %cr0, %eax
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	orl $0x1,%eax
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	orl $0x1, %eax
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	movl %eax,%cr0			# switch to protected mode
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	movl %eax, %cr0			# switch to protected mode
- 
 
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	jmpl $8,$meeting_point
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	jmpl $8, $boot_image_start
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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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multiboot_header:
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multiboot_header:
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_FLAGS
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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_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
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	.long multiboot_header
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	.long multiboot_header + BOOT_OFFSET
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	.long unmapped_ktext_start
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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 0
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	.long 0
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	.long multiboot_image_start
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	.long multiboot_image_start + BOOT_OFFSET
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- 
 
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boot_image_start:
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	movw $16, %ax
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	movw %ax, %es
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	movw %ax, %gs
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	movw %ax, %fs
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	movw %ax, %ds			# kernel data + stack
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	movw %ax, %ss
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- 
 
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	call map_kernel			# map kernel and turn paging on
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- 
 
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	movb $0xd1, %al			# enable A20 using the keyboard controller
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	outb %al, $0x64
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	movb $0xdf, %al
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	outb %al, $0x60
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	movl $0x8000, %esi
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	movl $0x8000 + BOOT_OFFSET, %edi
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	movl $_hardcoded_kernel_size, %ecx
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	cld
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	rep movsb
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	jmp protected
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multiboot_image_start:
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multiboot_image_start:
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	movl $0x7c00, %esp		# initialize stack pointer
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	movl $0x7c00, %esp		# initialize stack pointer
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	lgdt gdtr
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	lgdt gdtr
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meeting_point:
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	movw $16,%ax
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	movw $16, %ax
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	movw %ax,%es
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	movw %ax, %es
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	movw %ax,%gs
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	movw %ax, %gs
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	movw %ax,%fs
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	movw %ax, %fs
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	movw %ax,%ds			# kernel data + stack
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	movw %ax, %ds			# kernel data + stack
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	movw %ax,%ss
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	movw %ax, %ss
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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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protected:
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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
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