feat(rme): add Realm security state definition
FEAT_RME introduces two additional security states,
Root and Realm security states. This patch adds Realm
security state awareness to SMCCC helpers and entry point info
structure.
Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I9cdefcc1aa71259b2de46e5fb62b28d658fa59bd
diff --git a/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S
index 51eb2bd..0d0a12d 100644
--- a/bl31/aarch64/runtime_exceptions.S
+++ b/bl31/aarch64/runtime_exceptions.S
@@ -500,6 +500,21 @@
stp x16, x17, [x6, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
str x18, [x6, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
+ /* Clear flag register */
+ mov x7, xzr
+
+#if ENABLE_RME
+ /* Copy SCR_EL3.NSE bit to the flag to indicate caller's security */
+ ubfx x7, x18, #SCR_NSE_SHIFT, 1
+
+ /*
+ * Shift copied SCR_EL3.NSE bit by 5 to create space for
+ * SCR_EL3.NS bit. Bit 5 of the flag correspondes to
+ * the SCR_EL3.NSE bit.
+ */
+ lsl x7, x7, #5
+#endif /* ENABLE_RME */
+
/* Copy SCR_EL3.NS bit to the flag to indicate caller's security */
bfi x7, x18, #0, #1