Re: [Qemu-devel] Qemu workstation

[Filip Navara]

----- PŮVODNÍ ZPRÁVA -----
Od: "Brad Campbell" <address@hidden>
Komu: address@hidden
Předmět: Re: [Qemu-devel] Qemu workstation
Datum: 7.4.2004 - 10:24:12

...
 
> It does? My information tells me that it halts the
> processor until an interrupt or other wakeup 
> source occurs. Check arch/i386/kernel/process.c
> 
> /*
> * We use this if we don't have any better
> * idle routine..
> */
> void default_idle(void)
> {
> if (current_cpu_data.hlt_works_ok && !hlt_counter) {
> __cli();
> if (!current->need_resched)
> safe_halt();
> else
> __sti();
> }
> }
> 
> and in include/asm/system.h
> 
> system.h:#define safe_halt()            __asm__
> __volatile__("sti; hlt": : :"memory")
> 
> Looks like a hlt to me and not a nop in site.
> The kernel does a check at boot time to see if the
> processor supports the hlt instruction and if it 
> does it uses that in the idle loop.
> 
> Am I wrong?
> 
> Brad
> 

You are right and I'm wrong, sorry.

- Filip


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