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; Switch to protected mode
switch_to_pm :
cli ; We must switch of interrupts until we have
; set -up the protected mode interrupt vector
; otherwise interrupts will run riot.
lgdt [ gdt_descriptor ] ; Load our global descriptor table , which defines
; the protected mode segments ( e.g. for code and data )
mov eax , cr0 ; To make the switch to protected mode , we set
or eax , 0 x1 ; the first bit of CR0 , a control register
mov cr0 , eax
jmp CODE_SEG : init_pm ; Make a far jump ( i.e. to a new segment ) to our 32 - bit
; code. This also forces the CPU to flush its cache of
; pre - fetched and real - mode decoded instructions , which can
; cause problems.
[ bits 32]
; Initialise registers and the stack once in PM.
init_pm :
mov ax , DATA_SEG ; Now in PM , our old segments are meaningless ,
mov ds , ax ; so we point our segment registers to the
mov ss , ax ; data selector we defined in our GDT
mov es , ax
mov fs , ax
mov gs , ax
mov ebp , 0 x90000 ; Update our stack position so it is right
mov esp , ebp ; at the top of the free space.
call BEGIN_PM ; Finally , call some well - known label
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