paging.asm

	;   disable paging
	mov eax, cr0
	and eax, (1<<31)-1
	mov cr0, eax

	; Clear memory that will
	; contain page tables stuff
	mov edi, 0xC1000
	mov cr3, edi
	xor eax, eax
	mov ecx, 4096
	rep stosd
	mov edi, cr3

	; set up paging tables
	mov dword [edi], 0xC2003
	add edi, 0x1000
	mov dword [edi], 0xC3003
	add edi, 0x1000
	mov dword [edi], 0xC4003
	add edi, 0x1000

	; identity map the first 4 MiB

	mov ebx, 0x3
	mov ecx, 0x200

	.se:
		mov dword [edi], ebx
		add ebx, 0x1000
		add edi, 8
		loop .se


	;   enable PAE paging
	mov eax, cr4
	or  eax, 1 << 5
	mov cr4, eax

	call print_dot

	;   set LM-bit
	mov ecx, 0xC0000080
	rdmsr
	or  eax, 1 << 8
	wrmsr

	call print_dot

	;   enable paging
	mov eax, cr0
	or  eax, 1 << 31
	mov cr0, eax

	call print_dot
	jmp $

	;   load 64-bit gdt
	lgdt [gdt.pointer]
	;   jump to 64-bit entry point
	jmp gdt.code:entry64

	call print_dot