feat(brbe): test that EL3 has properly enabled access to BRBE
Access to FEAT_BRBE control registers must be explicitly enabled in EL3,
this simple test just ensures that the registers are accessible or traps
to EL3, similar to the TRBE test.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I0a25c5ce6beb6aa96b9428264b75cb3569ac535a
diff --git a/tftf/tests/extensions/brbe/test_brbe.c b/tftf/tests/extensions/brbe/test_brbe.c
new file mode 100644
index 0000000..f2c244a
--- /dev/null
+++ b/tftf/tests/extensions/brbe/test_brbe.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+
+#include <test_helpers.h>
+#include <tftf_lib.h>
+#include <tftf.h>
+
+/*
+ * EL3 is expected to allow access to branch record buffer control registers
+ * from NS world. Accessing these registers will trap to EL3 and crash when EL3
+ * has not properly enabled it.
+ */
+test_result_t test_brbe_enabled(void)
+{
+ SKIP_TEST_IF_AARCH32();
+
+#ifdef __aarch64__
+ SKIP_TEST_IF_BRBE_NOT_SUPPORTED();
+
+ read_brbcr_el1();
+ read_brbcr_el2();
+ read_brbfcr_el1();
+ read_brbts_el1();
+ read_brbinfinj_el1();
+ read_brbsrcinj_el1();
+ read_brbtgtinj_el1();
+ read_brbidr0_el1();
+
+ return TEST_RESULT_SUCCESS;
+#endif /* __aarch64__ */
+}