refactor(cm): move EL3 registers to global context
Currently, EL3 context registers are duplicated per-world per-cpu.
Some registers have the same value across all CPUs, so this patch
moves these registers out into a per-world context to reduce
memory usage.
Change-Id: I91294e3d5f4af21a58c23599af2bdbd2a747c54a
Signed-off-by: Elizabeth Ho <elizabeth.ho@arm.com>
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
diff --git a/include/arch/aarch64/el3_common_macros.S b/include/arch/aarch64/el3_common_macros.S
index 536d807..9c9c00f 100644
--- a/include/arch/aarch64/el3_common_macros.S
+++ b/include/arch/aarch64/el3_common_macros.S
@@ -441,4 +441,20 @@
#endif
.endm
+/* -----------------------------------------------------------------
+ * The below macro reads SCR_EL3 from the context structure to
+ * determine the security state of the context upon ERET.
+ * ------------------------------------------------------------------
+ */
+ .macro get_security_state _ret:req, _scr_reg:req
+ ubfx \_ret, \_scr_reg, #SCR_NSE_SHIFT, #1
+ cmp \_ret, #1
+ beq realm_state
+ bfi \_ret, \_scr_reg, #0, #1
+ b end
+ realm_state:
+ mov \_ret, #2
+ end:
+ .endm
+
#endif /* EL3_COMMON_MACROS_S */