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

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on cpukit/score/cpu/x86_64/include/rtems/score/cpu.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150615

 >  
 >  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" );

there is already `amd64_spinwait()`

I like the idea of generalizing this for other architectures though, so I'm happy with the new function. Maybe we should go with `_CPU_Spin_wait()` though. I believe there is `pause` in riscv also, and arm's `yield` function looks similar.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150615
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