Re: [RFC PATCH Mach] Add a mach host operation which returns elapsed time since bootup

[Luca]

Hi,

Il 18/12/24 02:20, Zhaoming Luo ha scritto:
> The precision of this implmentation is 10ms. Not sure how to do with the
> possible data race.
>
> Signed-off-by: Zhaoming Luo <zhmingluo@163.com>
> ---
>   include/mach/mach_host.defs |  7 +++++++
>   kern/mach_clock.c           | 20 ++++++++++++++++++++
>   2 files changed, 27 insertions(+)
>
> diff --git a/include/mach/mach_host.defs b/include/mach/mach_host.defs
> index 8fd9d6b3..67f72cda 100644
> --- a/include/mach/mach_host.defs
> +++ b/include/mach/mach_host.defs
> @@ -386,3 +386,10 @@ routine    host_adjust_time64(
>   routine       host_get_kernel_version(
>                 host            : host_t;
>         out     kernel_version  : new_kernel_version_t);
> +
> +/*
> + *     Get the elapsed time on this host.
> + */
> +routine        host_get_elapsed_time(
> +               host            : host_t;
> +       out     elapsed_time    : time_value_t);

Why not expose this with a kernel device that can be memory mapped, as 
done by the "time" device?


Luca