RTEMS | [riscv] cpukit/score/.../cpu.h: Implement _CPU_Spin_wait() (!1351)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1351

Project:Branches: wmthornton-dev/rtems:cpu-spin-wait-riscv to rtems/rtos/rtems:main
Author:   Wayne Thornton



## Summary

[riscv] cpukit/score/.../cpu.h: Implement _CPU_Spin_wait()

_CPU_Spin_wait() is an assembly function which prevents
aggressive speculative execution by the CPU during spin-wait
loops. Added benefit is reduction of thermal load. This
function is part of the Deterministic Hedged Read Library API.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1351
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