score: Simplify FP context allocation

Use the stack area to allocate the FP context.  This considerably
simplifies the application configuration since the task count no longer
influences the configured work space size.  With this change the stack
space size is overestimated since an FP context for each thread is
accounted.  Memory constraint applications can use the stack size for
fine tuning.

Update #3835.

1 files changed, 16 insertions, 3 deletions

diff --git a/cpukit/include/rtems/score/stackimpl.h b/cpukit/include/rtems/score/stackimpl.h
index f4671dea60..60704534c7 100644
--- a/cpukit/include/rtems/score/stackimpl.h
+++ b/cpukit/include/rtems/score/stackimpl.h
@@ -22,6 +22,7 @@
 #define _RTEMS_SCORE_STACKIMPL_H
 
 #include <rtems/score/stack.h>
+#include <rtems/score/context.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -74,15 +75,27 @@ RTEMS_INLINE_ROUTINE uint32_t _Stack_Minimum (void)
  * a valid stack area on this processor, and false otherwise.
  *
  * @param size The stack size to check.
+ * @param is_fp Indicates if the stack is for a floating-point thread.
  *
  * @retval true @a size is large enough.
  * @retval false @a size is not large enough.
  */
-RTEMS_INLINE_ROUTINE bool _Stack_Is_enough (
-  size_t size
+RTEMS_INLINE_ROUTINE bool _Stack_Is_enough(
+  size_t size,
+  bool   is_fp
 )
 {
-  return ( size >= _Stack_Minimum() );
+  size_t minimum;
+
+  minimum = _Stack_Minimum();
+
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
+  if ( is_fp ) {
+    minimum += CONTEXT_FP_SIZE;
+  }
+#endif
+
+  return ( size >= minimum );
 }
 
 /**