Assembly:
```
/* FUNCTION DEF: uint64_t Armv8_getCoreId(); */
        .global Armv8_getCoreId
        .type   Armv8_getCoreId, %function
Armv8_getCoreId:
        mrs     x0, mpidr_el1        /*returns are in x0(r0) */
        and     x0, x0, #0xff
        ret
```