RTEMS | cpukit: Create DHRL Library for DRAM Latency Mitigation (!1193)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion on cpukit/score/cpu/x86_64/include/rtems/score/cpu.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150828

 >  
 >  typedef uintptr_t CPU_Uint32ptr;
 >  
 > +/**
 > + * @brief Pauses the CPU pipeline to prevent aggressive speculative execution
 > + * and reduce thermal load during spin-wait loops.
 > + */
 > +static inline void _CPU_Pause_speculation( void )
 > +{
 > +  __asm__ volatile( "pause" ::: "memory" );

So would you want to see an MR just for adding the `_CPU_Spin_wait()` to the `x86-64/amd64` BSP? At the moment, it's part of this MR because it's needed for testing and validation otherwise the API will never be built nor could it be tested. So I guess I'm a bit unclear about what you would like to see moving forward

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150828
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