ResetVector.S

.section .reset16,"ax"
.code16
reset_vector2:
    ljmpw $0xf000, $1f
1:
    lgdtl %cs:gdtr
    mov %cr0, %eax
    or $1, %al
    mov %eax, %cr0
    ljmpl $0x8, $SecEntry

gdtr:
	.word 40
    .long gdt

.section .reset_vector,"ax"
.code16
.global reset_vector
reset_vector:
    jmp . - 0xff0
    .rept 13
        nop
    .endr
    

.section .text
SecEntry:
    cli
    hlt

.section .rodata
gdt:
	.quad	0x0000000000000000
	.quad	0x00CF9A000000FFFF
	.quad	0x00CF92000000FFFF