foc-arndale: use same context area location

Currently, on the Arndale platform, core uses a different thread context
area base address than the other tasks (0x20000000 vs. 0x40000000). This
is problematic, because core calculates the location of the UTCB area of a
new thread relatively to core's own thread context area base. So, the UTCB
area of non-core threads ends up in a virtual address range which is
outside of the task's thread context area and not marked as used in the
task's RM session.

With this patch, the same thread context area base address gets used in
core and in the other tasks.

Fixes #779.

base-foc/lib/mk/arm/base.mk

@@ -0,0 +1,3 @@
+include $(REP_DIR)/lib/mk/base.inc
+
+SRC_CC += thread/thread_context_area.cc

base-foc/lib/mk/base.inc

@@ -9,7 +9,7 @@ LIBS += base-common
 SRC_CC += console/log_console.cc
 SRC_CC += env/env.cc env/context_area.cc env/reload_parent_cap.cc \
           env/cap_map_remove.cc env/cap_alloc.cc
-SRC_CC += thread/thread_start.cc thread/thread_context_area.cc
+SRC_CC += thread/thread_start.cc
 
 INC_DIR += $(BASE_DIR)/src/base/env
 

base-foc/lib/mk/exynos5/base.mk

@@ -0,0 +1,3 @@
+include $(REP_DIR)/lib/mk/base.inc
+
+SRC_CC += thread/arndale/thread_context_area.cc

base-foc/lib/mk/x86/base.mk

@@ -0,0 +1,3 @@
+include $(REP_DIR)/lib/mk/base.inc
+
+SRC_CC += thread/thread_context_area.cc

base-foc/src/base/thread/arndale/thread_context_area.cc

@@ -6,6 +6,10 @@
  * We need to place the context area within core outside the physical memory.
  * Sigma0 maps physical to core-local memory always 1:1 when using
  * SIGMA0_REQ_FPAGE_ANY. Those mappings would interfere with the context area.
+ *
+ * Because the UTCB area of a task resides at the end of the context area and
+ * its address gets calculated by core, the context area in other tasks needs
+ * to be at the same address as in core.
  */
 
 #include <base/native_types.h>

base-foc/src/core/arndale/target.mk

@@ -1,5 +1,5 @@
 # override default location of thread context area within core
-vpath thread_context_area.cc $(PRG_DIR)
+vpath thread_context_area.cc $(REP_DIR)/src/base/thread/arndale
 
 include $(PRG_DIR)/../target.inc