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
diff --git a/bl31/bl31.mk b/bl31/bl31.mk
index f7c2168..9df7128 100644
--- a/bl31/bl31.mk
+++ b/bl31/bl31.mk
@@ -63,7 +63,8 @@
gic_v3_sysregs.o \
bakery_lock.o \
runtime_svc.o \
- early_exceptions.o
+ early_exceptions.o \
+ context.o
BL31_ENTRY_POINT := bl31_entrypoint
BL31_MAPFILE := bl31.map