event: Add basic support for events
Add a way to create and dispatch events without needing to allocate
memory. Also add a way to 'spy' on events, thus allowing 'hooks' to be
created.
Use a linker list for static events, which we can use to replace functions
like arch_cpu_init_f(). Allow an EVENT_DEBUG option which makes it
easier to see what is going on at runtime, but uses more code space.
Dynamic events allow the creation of a spy at runtime. This is not always
necessary, but can be enabled with EVENT_DYNAMIC if needed.
A 'test' event is the only option for now.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Makefile b/common/Makefile
index 3eff719..cc2ba30 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -89,6 +89,8 @@
endif
endif
+obj-$(CONFIG_$(SPL_TPL_)EVENT) += event.o
+
obj-$(CONFIG_$(SPL_TPL_)HASH) += hash.o
obj-$(CONFIG_IO_TRACE) += iotrace.o
obj-y += memsize.o