From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:13:47 +0200
Subject: Adding upstream version 2.8.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 lib/extensions/brbe/brbe.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 lib/extensions/brbe/brbe.c

(limited to 'lib/extensions/brbe/brbe.c')

diff --git a/lib/extensions/brbe/brbe.c b/lib/extensions/brbe/brbe.c
new file mode 100644
index 0000000..1982619
--- /dev/null
+++ b/lib/extensions/brbe/brbe.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_features.h>
+#include <arch_helpers.h>
+
+void brbe_enable(void)
+{
+	uint64_t val;
+
+	if (is_feat_brbe_present()) {
+		/*
+		 * 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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