config: Add CONFIGURE_IDLE_TASK_STORAGE_SIZE

By default, allocate the IDLE task storage areas from the RTEMS Workspace.
This avoids having to estimate the thread-local storage size in the default
configuration.

Add the application configuration option CONFIGURE_IDLE_TASK_STORAGE_SIZE to
request a static allocation of the task storage area for IDLE tasks.

Update #3835.
Update #4524.

1 files changed, 19 insertions, 24 deletions

diff --git a/cpukit/score/src/stackallocatorforidle.c b/cpukit/score/src/stackallocatorforidle.c
index c97dde030f..c8c8c0b766 100644
--- a/cpukit/score/src/stackallocatorforidle.c
+++ b/cpukit/score/src/stackallocatorforidle.c
@@ -1,6 +1,15 @@
-/*
- * SPDX-License-Identifier: BSD-2-Clause
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSScoreStack
  *
+ * @brief This source file contains the implementation of
+ *   _Stack_Allocator_allocate_for_idle_static().
+ */
+
+/*
  * Copyright (C) 2021 On-Line Applications Research Corporation (OAR)
  *
  * Redistribution and use in source and binary forms, with or without
@@ -30,35 +39,21 @@
 #endif
 
 #include <rtems/score/stack.h>
-#include <rtems/score/thread.h>
 #include <rtems/score/assert.h>
 
-/**
- * @brief Default stack allocator allocate for IDLE threads.
- *
- * The default allocator for IDLE thread stacks gets the memory from a
- * statically allocated area provided via confdefs.h.
- *
- * @param cpu is the index of the CPU for the IDLE thread using this stack.
- *
- * @param stack_size[in] is pointer to a size_t object.  On function
- *   entry, the object contains the size of the stack area to allocate in
- *   bytes.
- *
- * @return Returns the pointer to begin of the allocated stack area.
- */
-static void *_Stack_Allocator_allocate_for_idle_default(
+void *_Stack_Allocator_allocate_for_idle_static(
   uint32_t  cpu_index,
-  size_t   *stack_size
+  size_t   *storage_size
 )
 {
+  size_t size;
+
+  size = _Stack_Allocator_allocate_for_idle_storage_size;
+  *storage_size = size;
 #if defined(RTEMS_SMP)
-  return &_Thread_Idle_stacks[ cpu_index * ( *stack_size ) ];
+  return &_Stack_Allocator_allocate_for_idle_storage_areas[ cpu_index * size ];
 #else
   _Assert( cpu_index == 0 );
-  return &_Thread_Idle_stacks[ 0 ];
+  return &_Stack_Allocator_allocate_for_idle_storage_areas[ 0 ];
 #endif
 }
-
-const Stack_Allocator_allocate_for_idle _Stack_Allocator_allocate_for_idle =
-        _Stack_Allocator_allocate_for_idle_default;