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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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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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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/boot/boot.h>
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#include <arch/boot/boot.h>
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#include <arch/boot/memmapasm.h>
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.section K_TEXT_START
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.section K_TEXT_START
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.global kernel_image_start
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.global kernel_image_start
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KTEXT=8
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KTEXT=8
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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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	movb $0xd1, %al			# enable A20 using the keyboard controller
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	movb $0xd1, %al			# enable A20 using the keyboard controller
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	outb %al, $0x64
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	outb %al, $0x64
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	movb $0xdf, %al
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	movb $0xdf, %al
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	outb %al, $0x60
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	outb %al, $0x60
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	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
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	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi
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	movl $_hardcoded_kernel_size, %ecx
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	movl $_hardcoded_kernel_size, %ecx
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	cld
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	cld
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	rep movsb
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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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	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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	movw %cx, %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 %ebx										# save parameters from GRUB
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	pushl %eax
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	pushl %eax
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	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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	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
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax			# compare GRUB signature
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	je valid_boot
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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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		# ...
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		movl %ecx, e820counter
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		jmp invalid_boot
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		jmp invalid_boot
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	valid_boot:
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	valid_boot:
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		movl (%ebx), %eax
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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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		# ... check flags in eax
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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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		movl 4(%ebx), %ecx
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		mem_invalid:
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		addl 8(%ebx), %ecx
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		movl %ecx, e801memorysize
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		movl %ecx, e801memorysize
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		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)
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		jc mmap_valid
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#		movl 44(%ebx), %ecx
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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 %ecx, %ecx
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		xorl %edx, %edx
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		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 %ecx, e820counter
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			movl %eax, (%edi)
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			movl 8(%esi), %eax					# mmap->base_addr_high
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#		movl 48(%ebx), %esi
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			movl %eax, 4(%edi)
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			movl 12(%esi), %eax					# mmap->length_low
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#		movl $e820table, %edi
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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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#		cld
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			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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#		rep movsb
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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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	invalid_boot:
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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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