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<a href="https://gitlab.rtems.org/pfaiks">Preston Faiks</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5214#note_120103">commented</a>:
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Thread-level (rather than system-level) is done by multiple other rtems BSPs. For example <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/cpukit/score/cpu/sparc/cpu_asm.S?ref_type=heads#L738" style="margin-top: 0;">Sparc</a> and <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/bsps/powerpc/shared/cpu_asm.S?ref_type=heads#L175">PowerPC</a>. So this really isn't a new feature.</p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">I think the usefulness of this is unquestionably better than having applications save/restore state before every single function which might invoke a context switch. Many systems have a code base that is impractical to modify to such a large extent.</p>
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