Support asynchronous method for BL3-2 initialization
This patch adds support for BL3-2 initialization by asynchronous
method where BL3-1 transfers control to BL3-2 using world switch.
After BL3-2 initialization, it transfers control to BL3-3 via SPD
service handler. The SPD service handler initializes the CPU context
to BL3-3 entrypoint depending on the return function indentifier from
TSP initialization.
Fixes ARM-software/TF-issues#184
Change-Id: I7b135c2ceeb356d3bb5b6a287932e96ac67c7a34
diff --git a/bl32/tsp/tsp.mk b/bl32/tsp/tsp.mk
index b9084d5..02cc13d 100644
--- a/bl32/tsp/tsp.mk
+++ b/bl32/tsp/tsp.mk
@@ -39,6 +39,14 @@
BL32_LINKERFILE := bl32/tsp/tsp.ld.S
+# This flag determines if the TSPD initializes BL3-2 in tspd_init() (synchronous
+# method) or configures BL3-1 to pass control to BL3-2 instead of BL3-3
+# (asynchronous method).
+TSP_INIT_ASYNC := 0
+
+$(eval $(call assert_boolean,TSP_INIT_ASYNC))
+$(eval $(call add_define,TSP_INIT_ASYNC))
+
# Include the platform-specific TSP Makefile
# If no platform-specific TSP Makefile exists, it means TSP is not supported
# on this platform.