config: Add _SMP_Processor_configure_maximum

Move the processor maximum configuration constant out of the
configuration table.

Update #3875.

cpukit/include/rtems/confdefs.h

@@ -2639,16 +2639,18 @@ struct _reent *__getreent(void)
   const rtems_configuration_table Configuration = {
     #ifdef RTEMS_SMP
       #ifdef _CONFIGURE_SMP_APPLICATION
-        true,
+        true
       #else
-        false,
+        false
       #endif
     #endif
-    #ifdef RTEMS_SMP
-      _CONFIGURE_MAXIMUM_PROCESSORS,
-    #endif
   };
 
+  #ifdef RTEMS_SMP
+    const uint32_t _SMP_Processor_configured_maximum =
+      _CONFIGURE_MAXIMUM_PROCESSORS;
+  #endif
+
   const uintptr_t _Workspace_Size = CONFIGURE_EXECUTIVE_RAM_SIZE;
 
   #ifdef CONFIGURE_UNIFIED_WORK_AREAS

cpukit/include/rtems/config.h

@@ -30,6 +30,7 @@
 #include <rtems/score/object.h>
 #include <rtems/score/isr.h>
 #include <rtems/score/memory.h>
+#include <rtems/score/smp.h>
 #include <rtems/score/stack.h>
 #include <rtems/score/userextdata.h>
 #include <rtems/score/threadidledata.h>
@@ -86,10 +87,6 @@ typedef struct {
   #ifdef RTEMS_SMP
     bool                         smp_enabled;
   #endif
-
-  #ifdef RTEMS_SMP
-    uint32_t                     maximum_processors;
-  #endif
 } rtems_configuration_table;
 
 /**
@@ -204,13 +201,8 @@ uint32_t rtems_configuration_get_maximum_extensions( void );
  *
  * @return The configured maximum count of processors.
  */
-#ifdef RTEMS_SMP
-  #define rtems_configuration_get_maximum_processors() \
-        (Configuration.maximum_processors)
-#else
-  #define rtems_configuration_get_maximum_processors() \
-        1
-#endif
+#define rtems_configuration_get_maximum_processors() \
+        (_SMP_Processor_configured_maximum)
 
 #ifdef __cplusplus
 }

cpukit/include/rtems/score/smp.h

@@ -36,6 +36,19 @@ extern "C" {
  * @{
  */
 
+/**
+ * @brief The configured processor maximum.
+ *
+ * In SMP configurations, this constant is defined by the application
+ * configuration via <rtems/confdefs.h>, otherwise it is a compile-time
+ * constant with the value one.
+ */
+#if defined(RTEMS_SMP)
+  extern const uint32_t _SMP_Processor_configured_maximum;
+#else
+  #define _SMP_Processor_configured_maximum 1
+#endif
+
 #if defined( RTEMS_SMP )
   extern uint32_t _SMP_Processor_maximum;