tree 01d72a57badfa7cc19c5530d64f4c308b6d37799
parent afff8cbdd816ca9b0d71ab54882ce70b21ed84e1
author Achin Gupta <achin.gupta@arm.com> 1403773132 +0100
committer Achin Gupta <achin.gupta@arm.com> 1405809113 +0100

Remove coherent stack usage from the warm boot path

This patch uses stacks allocated in normal memory to enable the MMU early in the
warm boot path thus removing the dependency on stacks allocated in coherent
memory. Necessary cache and stack maintenance is performed when a cpu is being
powered down and up. This avoids any coherency issues that can arise from
reading speculatively fetched stale stack memory from another CPUs cache. These
changes affect the warm boot path in both BL3-1 and BL3-2.

The EL3 system registers responsible for preserving the MMU state are not saved
and restored any longer. Static values are used to program these system
registers when a cpu is powered on or resumed from suspend.

Change-Id: I8357e2eb5eb6c5f448492c5094b82b8927603784