RTEMS | bsp/aarch64:SMP improvement on aarch64 (!113)

[Sebastian Huber (@sebhub)]

Sebastian Huber started a new discussion on bsps/aarch64/shared/start/start.S: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/113#note_112155

 >  _el1_start:
 >  
 >  #ifdef RTEMS_SMP
 > -  /* Read MPIDR and get current processor index */
 > -  mrs x7, mpidr_el1
 > -  and x7, x7, #0xff
 > +  ldr x3, =aarch64_cpu_boot_params

The approach with this table is quite complicated and not necessary for most systems. Why can't you simply call a function which is provided by the BSP? For example:
```
#ifdef RTEMS_SMP
  bl _AArch64_Get_current_processor
  ...
```
The default implementation is:
```
FUNCTION_ENTRY(_AArch64_Get_current_processor)
  mrs x0, mpidr_el1
  and x0, x0, #0xff
FUNCTION_END(_AArch64_Get_current_processor)
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/113#note_112155
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