From be58c81aff4cd4c0ccf43dbd7998da4a6a08c03b Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 19:43:51 +0200
Subject: Adding upstream version 2.10.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 lib/extensions/brbe/brbe.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 lib/extensions/brbe/brbe.c

(limited to 'lib/extensions/brbe')

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);
+}
-- 
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