From eea21eaca117ecd98afea164e1808d6530ef487f Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 13 Dec 2019 06:18:36 +0100 Subject: 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. --- cpukit/sapi/src/exinit.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'cpukit/sapi/src/exinit.c') diff --git a/cpukit/sapi/src/exinit.c b/cpukit/sapi/src/exinit.c index 54e44515d3..196c9be576 100644 --- a/cpukit/sapi/src/exinit.c +++ b/cpukit/sapi/src/exinit.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -57,6 +58,18 @@ _Objects_Information_table[ OBJECTS_APIS_LAST + 1 ] = { &_POSIX_Objects[ 0 ] }; +RTEMS_LINKER_RWSET( + _Per_CPU_Data, +#if defined(RTEMS_SMP) + /* + * In SMP configurations, prevent false cache line sharing of per-processor + * data with a proper alignment. + */ + RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES ) +#endif + char +); + static void rtems_initialize_data_structures(void) { /* -- cgit v1.2.3