RTEMS | bsps/raspberrypi5: Add SMP support (!1072)

[Preetam Das (@lostux)]

Preetam Das commented on a discussion on bsps/aarch64/raspberrypi5/start/start-cpu-mpidr.S: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1072#note_143304

 > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 > + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 > + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 > + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 > + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 > + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 > + * POSSIBILITY OF SUCH DAMAGE.
 > + */
 > +
 > +#include <rtems/asm.h>
 > +
 > +FUNCTION_ENTRY(_AArch64_Get_current_processor_for_system_start)
 > +
 > +  /* Return the affinity level 1 reported by the MPIDR_EL1 */

The A76 cores in the PI5 places the core IDs in AFF1 \[15:8\] instead of AFF0 \[7:0\]. For that reason, we shift it out in the LSB region to return it. That is the basic explanation. I will add this in the comment block.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1072#note_143304
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