Re: [PATCH v2 2/9] pc-bios: s390x: Consolidate timing functions into time.h

[David Hildenbrand]

[...]

>  
> -static inline void yield(void)
> -{
> -    asm volatile ("diag 0,0,0x44"
> -                  : :
> -                  : "memory", "cc");
> -}
> -

Nit: Looks weird that yield() is moved to time.h

Wonder if there is a better fit for this function.

>  #define MAX_SECTOR_SIZE 4096
>  
> -static inline void sleep(unsigned int seconds)
> -{
> -    ulong target = get_second() + seconds;
> -
> -    while (get_second() < target) {
> -        yield();
> -    }
> -}
> -
>  static inline void IPL_assert(bool term, const char *message)
>  {
>      if (!term) {
> diff --git a/pc-bios/s390-ccw/time.h b/pc-bios/s390-ccw/time.h
> new file mode 100644
> index 0000000000..899de83ae7
> --- /dev/null
> +++ b/pc-bios/s390-ccw/time.h
> @@ -0,0 +1,39 @@
> +#ifndef TIME_H
> +#define TIME_H
> +
> +static inline u64 get_clock(void)
> +{
> +    u64 r;
> +
> +    asm volatile("stck %0" : "=Q" (r) : : "cc");
> +    return r;
> +}
> +
> +static inline u64 get_time_ms(void)
> +{
> +    /* Bit 51 is incremented each microsecond */
> +    return (get_clock() >> 12) / 1000;
> +}
> +
> +static inline u64 get_time_seconds(void)
> +{
> +    return (get_time_ms()) / 1000;

return get_time_ms() / 1000;



-- 
Thanks,

David / dhildenb