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

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion on cpukit/dhrl/dhrl.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150646

 > +
 > +    switch ( ctx->active_config.data_size ) {
 > +      case 1:
 > +        (void) *(volatile uint8_t *) target_addr;
 > +        break;
 > +      case 2:
 > +        (void) *(volatile uint16_t *) target_addr;
 > +        break;
 > +      case 4:
 > +        (void) *(volatile uint32_t *) target_addr;
 > +        break;
 > +      case 8:
 > +        (void) *(volatile uint64_t *) target_addr;
 > +        break;
 > +      default:
 > +        continue;

It's logically impossible for the code to ever reach this `default` case unless the internal memory structure is actively corrupted during runtime. I've added `rtems/score/basedefs.h` as an `#include' and set the 'default' case to 'RTEMS_UNREACHABLE()'. Will push in the next commit.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150646
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