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#include <arch/boot/memmap.h>
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#include <arch/boot/memmap.h>
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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <arch/pm.h>
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#include <arch/pm.h>
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.section K_TEXT_START, "ax"
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.section K_TEXT_START, "ax"
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.global kernel_image_start
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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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.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:
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	cli
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	xorw %ax, %ax
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	movw %ax, %ds
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	movw %ax, %es
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	movw %ax, %ss							# initialize stack segment register
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	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
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	call memmap_arch_init
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	lgdt real_bootstrap_gdtr_boot					# initialize Global Descriptor Table register
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	movl %cr0, %eax
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	orl $0x1, %eax
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	movl %eax, %cr0							# switch to protected mode
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	jmpl $KTEXT, $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 unmapped_ktext_start + 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 0
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	.long 0
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	.long multiboot_image_start + BOOT_OFFSET
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	.long multiboot_image_start + BOOT_OFFSET
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boot_image_start:
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	movw $KDATA, %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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	movb $0xd1, %al							# enable A20 using i8042 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 $BOOTSTRAP_OFFSET, %esi
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	movl $BOOTSTRAP_OFFSET + 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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	call map_kernel							# map kernel and turn paging on
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	call main_bsp							# never returns
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	cli
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	hlt
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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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