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Re: [Qemu-devel] [PATCH 6/6] target-alpha: Add high-resolution access to


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 6/6] target-alpha: Add high-resolution access to wall clock and an alarm.
Date: Fri, 26 Aug 2011 04:51:00 +0100

On 25 August 2011 22:45, Richard Henderson <address@hidden> wrote:
> @@ -1604,6 +1607,12 @@ static void gen_mfpr(int ra, int regno)
>         return;
>     }
>
> +    if (regno == 250) {
> +        /* WALL_TIME */
> +        gen_helper_get_time(cpu_ir[ra]);
> +        return;
> +    }
> +
>     /* The basic registers are data only, and unknown registers
>        are read-zero, write-ignore.  */
>     if (data == 0) {
> @@ -1650,6 +1659,11 @@ static ExitStatus gen_mtpr(DisasContext *ctx, int rb, 
> int regno)
>         gen_helper_halt(tmp);
>         return EXIT_PC_STALE;
>
> +    case 251:
> +        /* ALARM */
> +        gen_helper_set_alarm(tmp);
> +        break;
> +
>     default:
>         /* The basic registers are data only, and unknown registers
>            are read-zero, write-ignore.  */

Don't you need some magic around helper calls that read/write
the time to keep -icount working? I don't understand this but
Paolo does...

-- PMM



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