Enable MTE support in both secure and non-secure worlds
This patch adds support for the new Memory Tagging Extension arriving in
ARMv8.5. MTE support is now enabled by default on systems that support
at EL0. To enable it at ELx for both the non-secure and the secure
world, the compiler flag CTX_INCLUDE_MTE_REGS includes register saving
and restoring when necessary in order to prevent register leakage
between the worlds.
Change-Id: I2d4ea993d6b11654ea0d4757d00ca20d23acf36c
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
diff --git a/bl32/tsp/tsp_main.c b/bl32/tsp/tsp_main.c
index 30bf6ff..0a81735 100644
--- a/bl32/tsp/tsp_main.c
+++ b/bl32/tsp/tsp_main.c
@@ -386,6 +386,14 @@
*/
tsp_get_magic(service_args);
+#if CTX_INCLUDE_MTE_REGS
+ /*
+ * Write a dummy value to an MTE register, to simulate usage in the
+ * secure world
+ */
+ write_gcr_el1(0x99);
+#endif
+
/* Determine the function to perform based on the function ID */
switch (TSP_BARE_FID(func)) {
case TSP_ADD: