[syslinux] CPU usage while at syslinux boot prompt

[H. Peter Anvin]

Ferenc Wagner wrote:
> 
> Ah.  But it doesn't sound much worse than asking the user to specify
> the base address of the port.  So if the user kindly provides the
> correct IRQ number and we point the corresponding vector to an iret
> and insert an hlt into the busy loop, is everything set?
> 
> Sorry if I'm sounding dense...

Sure, IF there is nothing else on that IRQ.  This will generally not be 
the case, and trusting the BIOS not to misbehave when it gets an IRQ 
from a device it didn't expect sharing the same IRQ is pretty scary.

	-hpa