tree de6341f67ab68096d46043febd87966cf0f975ed
parent 429421de8297172e43b507b732e1cd6be06dfc21
author Vikram Kanigiri <vikram.kanigiri@arm.com> 1396376786 +0100
committer Vikram Kanigiri <vikram.kanigiri@arm.com> 1398778815 +0100

Preserve PSCI cpu_suspend 'power_state' parameter.

This patch saves the 'power_state' parameter prior to suspending
a cpu and invalidates it upon its resumption. The 'affinity level'
and 'state id' fields of this parameter can be read using a set of
public and private apis. Validation of power state parameter is
introduced which checks for SBZ bits are zero.
This change also takes care of flushing the parameter from the cache
to main memory. This ensures that it is available after cpu reset
when the caches and mmu are turned off. The earlier support for
saving only the 'affinity level' field of the 'power_state' parameter
has also been reworked.

Fixes ARM-Software/tf-issues#26
Fixes ARM-Software/tf-issues#130

Change-Id: Ic007ccb5e39bf01e0b67390565d3b4be33f5960a