Adding upstream version 2.10.0+dfsg.upstream/2.10.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/extensions/brbe/brbe.c b/lib/extensions/brbe/brbe.c
new file mode 100644
index 0000000..37bd834
--- /dev/null
+++ b/lib/extensions/brbe/brbe.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2022-2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_features.h>
+#include <arch_helpers.h>
+#include <lib/extensions/brbe.h>
+
+void brbe_init_el3(void)
+{
+	uint64_t val;
+
+	/*
+	 * MDCR_EL3.SBRBE = 0b01
+	 *
+	 * Allows BRBE usage in non-secure world and prohibited in
+	 * secure world.
+	 */
+	val = read_mdcr_el3();
+	val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT);
+	val |= (0x1UL << MDCR_SBRBE_SHIFT);
+	write_mdcr_el3(val);
+}