Port of RTEMS to the Texas Instruments C3x/C4x DSP families including

a BSP (c4xsim) supporting the simulator included with gdb.  This port
was done by Joel Sherrill and Jennifer Averett of OAR Corporation.
Also included with this port is a space/time optimization to eliminate
FP context switch management on CPUs without hardware or software FP.

An issue with this port was that sizeof(unsigned32) = sizeof(unsigned8)
on this CPU.  This required addressing alignment checks and assumptions
as well as fixing code that assumed sizeof(unsigned32) == 4.

5 files changed, 10 insertions, 2 deletions

diff --git a/cpukit/score/src/thread.c b/cpukit/score/src/thread.c
index 9cb197e5bc..c71f025d39 100644
--- a/cpukit/score/src/thread.c
+++ b/cpukit/score/src/thread.c
@@ -63,7 +63,9 @@ void _Thread_Handler_initialization(
   _Context_Switch_necessary = FALSE;
   _Thread_Executing         = NULL;
   _Thread_Heir              = NULL;
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
   _Thread_Allocated_fp      = NULL;
+#endif
 
   _Thread_Do_post_task_switch_extension = 0;
 
diff --git a/cpukit/score/src/threadclose.c b/cpukit/score/src/threadclose.c
index 4f2c9a6de5..882672d47e 100644
--- a/cpukit/score/src/threadclose.c
+++ b/cpukit/score/src/threadclose.c
@@ -53,6 +53,7 @@ void _Thread_Close(
 
   _User_extensions_Thread_delete( the_thread );
  
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
 #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE )
   if ( _Thread_Is_allocated_fp( the_thread ) )
     _Thread_Deallocate_fp();
@@ -60,7 +61,8 @@ void _Thread_Close(
   the_thread->fp_context = NULL;
 
   if ( the_thread->Start.fp_context )
-  (void) _Workspace_Free( the_thread->Start.fp_context );
+    (void) _Workspace_Free( the_thread->Start.fp_context );
+#endif
 
   _Thread_Stack_Free( the_thread );
 
diff --git a/cpukit/score/src/threaddispatch.c b/cpukit/score/src/threaddispatch.c
index 311947cfa9..66a8996a12 100644
--- a/cpukit/score/src/threaddispatch.c
+++ b/cpukit/score/src/threaddispatch.c
@@ -92,7 +92,7 @@ void _Thread_Dispatch( void )
      *  operations.
      */
 
-#if ( CPU_HARDWARE_FP == TRUE )
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
 #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE )
     if ( (heir->fp_context != NULL) && !_Thread_Is_allocated_fp( heir ) ) {
       if ( _Thread_Allocated_fp != NULL )
diff --git a/cpukit/score/src/threadinitialize.c b/cpukit/score/src/threadinitialize.c
index 0d5154c400..fe4e9fa2b5 100644
--- a/cpukit/score/src/threadinitialize.c
+++ b/cpukit/score/src/threadinitialize.c
@@ -95,6 +95,7 @@ boolean _Thread_Initialize(
    *  Allocate the floating point area for this thread
    */
   
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
   if ( is_fp ) {
 
     fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE );
@@ -109,6 +110,7 @@ boolean _Thread_Initialize(
 
   the_thread->fp_context       = fp_area;
   the_thread->Start.fp_context = fp_area;
+#endif
 
   /*
    *  Allocate the extensions area for this thread
diff --git a/cpukit/score/src/threadloadenv.c b/cpukit/score/src/threadloadenv.c
index c3493eeccd..af1233f709 100644
--- a/cpukit/score/src/threadloadenv.c
+++ b/cpukit/score/src/threadloadenv.c
@@ -45,11 +45,13 @@ void _Thread_Load_environment(
 {
   boolean is_fp = FALSE;
 
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
   if ( the_thread->Start.fp_context ) {
     the_thread->fp_context = the_thread->Start.fp_context;
     _Context_Initialize_fp( &the_thread->fp_context );
     is_fp = TRUE;
   }
+#endif
 
   the_thread->do_post_task_switch_extension = FALSE;
   the_thread->is_preemptible   = the_thread->Start.is_preemptible;