[PATCH 2/2] cpukit/aarch64: Add Per_CPU_Control accessor

[Gedare Bloom]

this part looks ok

On Fri, Feb 25, 2022 at 5:51 PM Kinsey Moore <kinsey.moore at oarcorp.com> wrote:
>
> Add an architecture-specific implementation for
> _CPU_Get_current_per_CPU_control() to reduce overhead for getting the
> current CPU's Per_CPU_Control structure.
> ---
>  .../cpu/aarch64/include/rtems/score/cpuimpl.h | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
>
> diff --git a/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h b/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
> index 90fd48ad4e..ffdef2f30a 100644
> --- a/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
> +++ b/cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
> @@ -125,6 +125,29 @@ typedef struct {
>    uint64_t register_fpcr;
>  } CPU_Interrupt_frame;
>
> +#ifdef RTEMS_SMP
> +
> +static inline
> +struct Per_CPU_Control *_AARCH64_Get_current_per_CPU_control( void )
> +{
> +  struct Per_CPU_Control *cpu_self;
> +  uint64_t value;
> +
> +  __asm__ volatile (
> +    "mrs %0, TPIDR_EL1" : "=&r" ( value ) : : "memory"
> +  );
> +
> +  /* Use EL1 Thread ID Register (TPIDR_EL1) */
> +  cpu_self = (struct Per_CPU_Control *)(uintptr_t)value;
> +
> +  return cpu_self;
> +}
> +
> +#define _CPU_Get_current_per_CPU_control() \
> +  _AARCH64_Get_current_per_CPU_control()
> +
> +#endif /* RTEMS_SMP */
> +
>  void _CPU_Context_volatile_clobber( uintptr_t pattern );
>
>  void _CPU_Context_validate( uintptr_t pattern );
> --
> 2.30.2
>
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