tree 6a5a37be2452298cc3b696eb97989c662d119f10
parent f57e2db6ef4b86a6af57891a2d7a90266ad6c033
author Juan Castillo <juan.castillo@arm.com> 1446216804 +0000
committer Achin Gupta <achin.gupta@arm.com> 1446741415 +0000

IMF: postpone SCR_EL3 update if context is not initialized

The set_routing_model() function in the Interrupt Management
Framework calls the context management library to update the
SCR_EL3 register. This context management library assumes that
the context has been previously initialized. Consequently, if
a Secure Payload Dispatcher (SPD) tries to set the routing model
before initializing the context, the system will fail (in debug
mode, an assertion will be raised).

This patch fixes the issue by checking if the context has been
initialized before updating SCR_EL3. If a valid context is not
available, SCR_EL3 update will be done when the SPD calls the
context initialization function. This function will call
get_scr_el3_from_routing_model() to obtain the SCR_EL3 value.
If the SPD does not call the context initialization function
then it is SPD's responsibility to obtain SCR_EL3 from the IMF
and update the context accordingly.

Fixes ARM-software/tf-issues#327

Change-Id: Ic2f1c6e899e578a8db858ec43747c63a8539c16f