OSDev.org

Posted: **Sun Jan 20, 2013 12:12 am**

In the bare bones tutorial, this code executes if the kernel returns

    cli
.hang:
    hlt                                 ; halt machine should kernel return
    jmp  .hang

If I understand correctly, the only way for the CPU to get out of the halt state is if there is an interrupt. But since we've disabled interrupts that can't happen. So is the above code the same as moving the hlt outside the loop?

Posted: **Sun Jan 20, 2013 12:44 am**

The hlt is in the loop just in case the hlt fails to execute for some unknown reason.

Posted: **Sun Jan 20, 2013 1:14 am**

And ic case of a NMI.

Cheers,
Adam

OSDev.org

Bare Bones - hlt instruction inside or outside the for loop

Bare Bones - hlt instruction inside or outside the for loop

Re: Bare Bones - hlt instruction inside or outside the for l

Re: Bare Bones - hlt instruction inside or outside the for l