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>
diff --git a/common/psci/psci_setup.c b/common/psci/psci_setup.c
index c471d1f..8d7903c 100644
--- a/common/psci/psci_setup.c
+++ b/common/psci/psci_setup.c
@@ -195,6 +195,9 @@
cm_set_context(mpidr,
(void *) &psci_ns_context[linear_id],
NON_SECURE);
+
+ /* Initialize exception stack in the context */
+ cm_init_exception_stack(mpidr, NON_SECURE);
}
return;
@@ -348,5 +351,5 @@
OEN_STD_END,
SMC_TYPE_FAST,
psci_setup,
- NULL
+ psci_smc_handler
);