[bits 16]

switch16_to_32:
	cli  ; disable interrupts until we finish setup, since the
		 ; 16-bit interrupt vector will be invalid

	lgdt [gdt_flat_descriptor]  ; load the GDT which defines the flat code and data segments

	mov eax, cr0  ; move the control register to eax so we can modify it
	or eax, 0x1   ; set the 1st bit to enable 32-bit pm
	mov cr0, eax  ; write the modified control value back

	jmp i_gdt_code_segment:initialize32  ; far-jump to our new 32-bit code, forcing CPU to clear the pipeline of 16-bit instructions


[bits 32]

initialize32:
	; Set up registers and stack once in 32-bit protected mode
	mov ax, i_gdt_data_segment  ; point the segment registers to the new data segment in 32-bit
	mov ds, ax
	mov ss, ax
	mov es, ax
	mov fs, ax
	mov gs, ax

	mov ebp, 0x90000  ; update stack position to be at the top of free space
	mov esp, ebp

	call main32