score: Add _SMP_Online_processors

cpukit/score/include/rtems/score/smpimpl.h

@@ -20,6 +20,7 @@
 
 #include <rtems/score/smp.h>
 #include <rtems/score/percpu.h>
+#include <rtems/score/processormask.h>
 #include <rtems/fatal.h>
 #include <rtems/rtems/cache.h>
 
@@ -90,6 +91,16 @@ static inline void _SMP_Fatal( SMP_Fatal_code code )
 
 #if defined( RTEMS_SMP )
 
+/**
+ * @brief Set of online processors.
+ *
+ * A processor is online if was started during system initialization.  In this
+ * case its corresponding bit in the mask is set.
+ *
+ * @see _SMP_Handler_initialize().
+ */
+extern Processor_mask _SMP_Online_processors;
+
 /**
  * @brief Performs high-level initialization of a secondary processor and runs
  * the application threads.

cpukit/score/src/smp.c

@@ -29,6 +29,8 @@
   #error "deferred FP switch not implemented for SMP"
 #endif
 
+Processor_mask _SMP_Online_processors;
+
 uint32_t _SMP_Processor_count;
 
 static void _SMP_Start_processors( uint32_t cpu_count )
@@ -36,7 +38,6 @@ static void _SMP_Start_processors( uint32_t cpu_count )
   uint32_t cpu_index_self = _SMP_Get_current_processor();
   uint32_t cpu_index;
 
-
   for ( cpu_index = 0 ; cpu_index < cpu_count; ++cpu_index ) {
     const Scheduler_Assignment *assignment =
       _Scheduler_Get_assignment( cpu_index );
@@ -69,6 +70,8 @@ static void _SMP_Start_processors( uint32_t cpu_count )
 
       ++context->processor_count;
       cpu->scheduler_context = context;
+
+      _Processor_mask_Set( _SMP_Online_processors, cpu_index );
     }
   }
 }

testsuites/smptests/smpipi01/init.c

@@ -161,6 +161,10 @@ static void test_send_message_flood(
   }
 
   for (cpu_index = 0; cpu_index < cpu_count; ++cpu_index) {
+    rtems_test_assert(
+      _Processor_mask_Is_set(_SMP_Online_processors, cpu_index)
+    );
+
     printf(
       "inter-processor interrupts for processor %"
         PRIu32 "%s: %" PRIu32 "\n",
@@ -169,6 +173,12 @@ static void test_send_message_flood(
       ctx->counters[cpu_index].value
     );
   }
+
+  for (; cpu_index < CPU_COUNT; ++cpu_index) {
+    rtems_test_assert(
+      !_Processor_mask_Is_set(_SMP_Online_processors, cpu_index)
+    );
+  }
 }
 
 static void test(void)