tree fcb099ebf7519b5954199ca2feff8b12112b1172
parent b739f22a99c96d5a295f083125505b5b5ec2f8b6
author Achin Gupta <achin.gupta@arm.com> 1389874083 +0000
committer Dan Handley <dan.handley@arm.com> 1392663104 +0000

Add helper library for cpu context management

This patch introduces functions for saving and restoring shared system
registers between secure and non-secure EL1 exception levels, VFP
registers and essential EL3 system register and other state. It also
defines the 'cpu_context' data structure which will used for saving and
restoring execution context for a given security state. These functions
will allow runtime services like PSCI and Secure payload dispatcher to
implement logic for switching between the secure and non-secure states.

The save and restore functions follow AArch64 PCS and only use
caller-saved temporary registers.

Change-Id: I8ee3aaa061d3caaedb28ae2c5becb9a206b6fd74