2008-06-16 Joel Sherrill <joel.sherrill@oarcorp.com>

	* rtems/include/rtems/rtems/config.h,
	rtems/include/rtems/rtems/tasks.h, rtems/src/taskgetnote.c,
	rtems/src/tasks.c, rtems/src/tasksetnote.c, sapi/include/confdefs.h:
	Add CONFIGURE_DISABLE_CLASSIC_API_NOTEPADS.

5 files changed, 46 insertions, 5 deletions

diff --git a/cpukit/rtems/include/rtems/rtems/config.h b/cpukit/rtems/include/rtems/rtems/config.h
index 5afc3063d4..4298e6a215 100644
--- a/cpukit/rtems/include/rtems/rtems/config.h
+++ b/cpukit/rtems/include/rtems/rtems/config.h
@@ -48,6 +48,12 @@ typedef struct {
   uint32_t                    maximum_tasks;
 
   /**
+   * This field indicates whether Classic API notepads are
+   * enabled or disabled.
+   */
+  boolean                     notepads_enabled;
+
+  /**
    * This field contains the maximum number of Classic API 
    * Timers which are configured for this application.
    */
@@ -110,6 +116,13 @@ typedef struct {
   rtems_initialization_tasks_table *User_initialization_tasks_table;
 } rtems_api_configuration_table;
 
+/**
+ *  This macro returns the value of the notepads enabled field
+ *  in the Classic API configuration table.
+ */
+#define rtems_configuration_get_notepads_enabled() \
+        rtems_configuration_get_rtems_api_configuration()->notepads_enabled
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/cpukit/rtems/include/rtems/rtems/tasks.h b/cpukit/rtems/include/rtems/rtems/tasks.h
index f09b0eb329..fe9f20ef45 100644
--- a/cpukit/rtems/include/rtems/rtems/tasks.h
+++ b/cpukit/rtems/include/rtems/rtems/tasks.h
@@ -201,16 +201,24 @@ typedef struct {
 /**
  *  This is the API specific information required by each thread for
  *  the RTEMS API to function correctly.
+ *
+ *  @note Notepads must be the last entry in the structure and memory
+ *        will be taken away from this structure when allocated if 
+ *        notespads are disabled by the application configuration.
  */
 typedef struct {
-  /** This field contains the notepads for this task. */
-  uint32_t                 Notepads[ RTEMS_NUMBER_NOTEPADS ];
   /** This field contains the pending events for this task. */
   rtems_event_set          pending_events;
   /** This field contains the event wait condition for this task. */
   rtems_event_set          event_condition;
   /** This field contains the Classic API Signal information for this task. */
   ASR_Information          Signal;
+  /**
+   *  This field contains the notepads for this task.
+   *
+   *  @note MUST BE LAST ENTRY.
+   */
+  uint32_t                 Notepads[ RTEMS_NUMBER_NOTEPADS ];
 }  RTEMS_API_Control;
 
 /**
diff --git a/cpukit/rtems/src/taskgetnote.c b/cpukit/rtems/src/taskgetnote.c
index dffb2da2d6..b3983f322a 100644
--- a/cpukit/rtems/src/taskgetnote.c
+++ b/cpukit/rtems/src/taskgetnote.c
@@ -17,6 +17,7 @@
 #endif
 
 #include <rtems/system.h>
+#include <rtems/config.h>
 #include <rtems/rtems/status.h>
 #include <rtems/rtems/support.h>
 #include <rtems/rtems/modes.h>
@@ -60,6 +61,9 @@ rtems_status_code rtems_task_get_note(
   Objects_Locations        location;
   RTEMS_API_Control       *api;
 
+  if ( !rtems_configuration_get_notepads_enabled() )
+    return RTEMS_NOT_CONFIGURED;
+    
   if ( !note )
     return RTEMS_INVALID_ADDRESS;
 
diff --git a/cpukit/rtems/src/tasks.c b/cpukit/rtems/src/tasks.c
index afde09a704..442f5e6954 100644
--- a/cpukit/rtems/src/tasks.c
+++ b/cpukit/rtems/src/tasks.c
@@ -16,6 +16,7 @@
 #endif
 
 #include <rtems/system.h>
+#include <rtems/config.h>
 #include <rtems/rtems/status.h>
 #include <rtems/rtems/support.h>
 #include <rtems/rtems/modes.h>
@@ -49,8 +50,17 @@ boolean _RTEMS_tasks_Create_extension(
 {
   RTEMS_API_Control *api;
   int                i;
+  size_t             to_allocate;
 
-  api = _Workspace_Allocate( sizeof( RTEMS_API_Control ) );
+  /*
+   *  Notepads must be the last entry in the structure and they
+   *  can be left off if disabled in the configuration.
+   */
+  to_allocate = sizeof( RTEMS_API_Control );
+  if ( !rtems_configuration_get_notepads_enabled() )
+    to_allocate -= (RTEMS_NUMBER_NOTEPADS * sizeof(uint32_t));
+
+  api = _Workspace_Allocate( to_allocate );
 
   if ( !api )
     return FALSE;
@@ -61,8 +71,10 @@ boolean _RTEMS_tasks_Create_extension(
   _ASR_Initialize( &api->Signal );
   created->task_variables = NULL;
 
-  for (i=0; i < RTEMS_NUMBER_NOTEPADS; i++)
-    api->Notepads[i] = 0;
+  if ( rtems_configuration_get_notepads_enabled() ) {
+    for (i=0; i < RTEMS_NUMBER_NOTEPADS; i++)
+      api->Notepads[i] = 0;
+  }
 
   return TRUE;
 }
diff --git a/cpukit/rtems/src/tasksetnote.c b/cpukit/rtems/src/tasksetnote.c
index c8d5f82b77..ebb501998e 100644
--- a/cpukit/rtems/src/tasksetnote.c
+++ b/cpukit/rtems/src/tasksetnote.c
@@ -17,6 +17,7 @@
 #endif
 
 #include <rtems/system.h>
+#include <rtems/config.h>
 #include <rtems/rtems/status.h>
 #include <rtems/rtems/support.h>
 #include <rtems/rtems/modes.h>
@@ -59,6 +60,9 @@ rtems_status_code rtems_task_set_note(
   Objects_Locations        location;
   RTEMS_API_Control       *api;
 
+  if ( !rtems_configuration_get_notepads_enabled() )
+    return RTEMS_NOT_CONFIGURED;
+    
   /*
    *  NOTE:  There is no check for < RTEMS_NOTEPAD_FIRST because that would
    *         be checking an unsigned number for being negative.