//http://wiki.osdev.org/GDT_Tutorial
.global setup_gdt

// call as setup_gdt(GDT,sizeof(GDT))
setup_gdt:

	// re-fill gdt_descriptor with new GDT location and size
	movl 4(%esp),%eax
	movl %eax, gdt_descriptor+2

	movw 8(%esp),%ax
	movw %ax, gdt_descriptor
	//

	lgdt gdt_descriptor	#load new descriptor table!

	// reload to take effect
	reloadSegments:

	    #Reload CS register containing code selector:
	    jmp   $0x08,$reload_CS # 0x08 points at the new code selector

	reload_CS:
	    mov $0x10, %ax #0x10 points at the new data selector
	    mov %ax, %ds
	    mov %ax, %es
	    mov %ax, %fs
	    mov %ax, %gs
	    mov %ax, %ss

	tss_flush:

	   movw $0x2B,%ax      # Load the index of our TSS structure - The index is
                     # 0x28, as it is the 5th selector and each is 8 bytes
                     # long, but we set the bottom two bits (making 0x2B)
                     # so that it has an RPL of 3, not zero.
	   ltr %ax            # Load 0x2B into the task state register.

	   ret

	   

ret