Gedare Bloom 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_150825

 >  
 >  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" );

You don't have to implement all of them, you can just get the framework 
started, and open issues for the remaining.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150825
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