tree a7eb5e977cc9971c051ef469877fc3d00cba24ad
parent 07f4e078b6871e5c74f6cb38f2726a2cfcb2b746
author Jeenu Viswambharan <jeenu.viswambharan@arm.com> 1391682975 +0000
committer Dan Handley <dan.handley@arm.com> 1392663104 +0000

Add support for handling runtime service requests

This patch uses the reworked exception handling support to handle
runtime service requests through SMCs following the SMC calling
convention. This is a giant commit since all the changes are
inter-related. It does the following:

1. Replace the old exception handling mechanism with the new one
2. Enforce that SP_EL0 is used C runtime stacks.
3. Ensures that the cold and warm boot paths use the 'cpu_context'
   structure to program an ERET into the next lower EL.
4. Ensures that SP_EL3 always points to the next 'cpu_context'
   structure prior to an ERET into the next lower EL
5. Introduces a PSCI SMC handler which completes the use of PSCI as a
   runtime service

Change-Id: I661797f834c0803d2c674d20f504df1b04c2b852
Co-authored-by: Achin Gupta <achin.gupta@arm.com>