bsps: Rework work area initialization

The work area initialization was done by the BSP through
bsp_work_area_initialize(). This approach predated the system
initialization through the system initialization linker set. The
workspace and C program heap were unconditionally initialized.  The aim
is to support RTEMS application configurations which do not need the
workspace and C program heap.  In these configurations, the workspace
and C prgram heap should not get initialized.

Change all bsp_work_area_initialize() to implement _Memory_Get()
instead.  Move the dirty memory, sbrk(), per-CPU data, workspace, and
malloc() heap initialization into separate system initialization steps.
This makes it also easier to test the individual initialization steps.

This change adds a dependency to _Heap_Extend() to all BSPs.  This
dependency will be removed in a follow up change.

Update #3838.

1 files changed, 24 insertions, 6 deletions

diff --git a/bsps/powerpc/shared/start/bspgetworkarea.c b/bsps/powerpc/shared/start/bspgetworkarea.c
index 8873ffe574..3d26a419a1 100644
--- a/bsps/powerpc/shared/start/bspgetworkarea.c
+++ b/bsps/powerpc/shared/start/bspgetworkarea.c
@@ -9,15 +9,33 @@
 
 #include <libcpu/powerpc-utility.h>
 
+#include <rtems/sysinit.h>
+
 LINKER_SYMBOL(__rtems_end)
 
-void bsp_work_area_initialize(void)
+static Memory_Area _Memory_Areas[1];
+
+static const Memory_Information _Memory_Information =
+  MEMORY_INFORMATION_INITIALIZER(_Memory_Areas);
+
+static void bsp_memory_initialize(void)
 {
-  uintptr_t work_size;
-  uintptr_t work_area;
+  uintptr_t size;
+  uintptr_t begin;
 
-  work_area = (uintptr_t)__rtems_end;
-  work_size = (uintptr_t)BSP_mem_size - work_area;
+  begin = (uintptr_t)__rtems_end;
+  size = (uintptr_t)BSP_mem_size - begin;
 
-  bsp_work_area_initialize_default((void *) work_area, work_size);
+  _Memory_Initialize_by_size(&_Memory_Areas[0], (void *) begin, size);
+}
+
+RTEMS_SYSINIT_ITEM(
+  bsp_memory_initialize,
+  RTEMS_SYSINIT_MEMORY,
+  RTEMS_SYSINIT_ORDER_MIDDLE
+);
+
+const Memory_Information *_Memory_Get(void)
+{
+  return &_Memory_Information;
 }