On Thu, 17 Jul 2003, Randy.Dunlap wrote:
>
> In arch/i386/kernel, inline asm for loading IDT (lidt) is used a few
> times, but with slightly different constraints and output/input
> definitions. Are these OK, equivalent, or what?
>
> [rddunlap@dragon kernel]$ findc lidt
> ./cpu/common.c:484: __asm__ __volatile__("lidt %0": "=m" (idt_descr));
> ./traps.c:783: __asm__ __volatile__("lidt %0": "=m" (idt_descr));
>
> vs.
>
> ./reboot.c:186: __asm__ __volatile__ ("lidt %0" : : "m" (real_mode_idt));
> ./reboot.c:261: __asm__ __volatile__("lidt %0": :"m" (no_idt));
> ./suspend.c:95: asm volatile ("lidt %0" :: "m" (saved_context.idt_limit));
I'd have said no looking at the syntax (input/output), but they indeed
generate the same code (just checked).
- Davide
-
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