add get_cpu_id syscall with No.700 for testing

arch/x86/kernel/include/syscall_list.h

@@ -89,5 +89,6 @@ SYSCALL_HANDLED(601, pmc_init)
 SYSCALL_HANDLED(602, pmc_start)
 SYSCALL_HANDLED(603, pmc_stop)
 SYSCALL_HANDLED(604, pmc_reset)
+SYSCALL_HANDLED(700, get_cpu_id)
 
 /**** End of File ****/

kernel/syscall.c

@@ -2014,6 +2014,11 @@ SYSCALL_DECLARE(sched_getaffinity)
 	return len;
 }
 
+SYSCALL_DECLARE(get_cpu_id)
+{
+	return ihk_mc_get_processor_id();
+}
+
 SYSCALL_DECLARE(sched_yield)
 {
 	return -ENOSYS;