Re: [Qemu-devel] [PATCH] qemu-timer: Don't use RDTSC on 386s and 486s

[Paolo Bonzini <pbonzini@redhat.com>]

Il 23/11/2012 16:12, Peter Maydell ha scritto:
> Adjust the conditional which guards the implementation of
> cpu_get_real_ticks() via RDTSC, so that we don't try to use it
> on x86 CPUs which don't implement RDTSC.  Instead we will fall
> back to the no-cycle-counter-available default implementation.
> 
> Reported-by: Yurij Popov <oss@djphoenix.ru>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  qemu-timer.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/qemu-timer.h b/qemu-timer.h
> index da7e97c..e35f163 100644
> --- a/qemu-timer.h
> +++ b/qemu-timer.h
> @@ -169,7 +169,7 @@ static inline int64_t cpu_get_real_ticks(void)
>      return retval;
>  }
>  
> -#elif defined(__i386__)
> +#elif defined(__i586__)
>  
>  static inline int64_t cpu_get_real_ticks(void)
>  {
> 

You should at least test __i686__ too:

$ gcc -m32 -dM -E -x c /dev/null |grep __i
#define __i686 1
#define __i686__ 1
#define __i386 1
#define __i386__ 1

Paolo