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

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/dhrl/dhrl.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150824

 > +/* Determine optimal interleave bit for given memory region */
 > +static void dhrl_calibrate_interleave( struct dhrl_control *ctx )
 > +{
 > +  if ( ctx->active_config.interleave_bit != 0 ) {
 > +    return;
 > +  }
 > +
 > +  uint8_t  best_bit = 6;
 > +  uint64_t lowest_latency = UINT64_MAX;
 > +
 > +  uint8_t max_safe_bit = 0;
 > +  size_t  safe_size = ctx->active_config.memory_region_size / 2;
 > +  while ( safe_size > 1 ) {
 > +    max_safe_bit++;
 > +    safe_size >>= 1;
 > +  }

Extending the internal support for 64-bit seems like it could be an independent improvement that would help out this library and also be useful for other purposes like priority scheduling.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150824
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