Messages in this thread | | | Date | Thu, 17 Jul 2003 15:36:19 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: asm (lidt) question |
| |
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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |