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>
---
 .../sys_reg_trace/aarch32/sys_reg_trace.c          | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 lib/extensions/sys_reg_trace/aarch32/sys_reg_trace.c

(limited to 'lib/extensions/sys_reg_trace/aarch32')

diff --git a/lib/extensions/sys_reg_trace/aarch32/sys_reg_trace.c b/lib/extensions/sys_reg_trace/aarch32/sys_reg_trace.c
new file mode 100644
index 0000000..89b8029
--- /dev/null
+++ b/lib/extensions/sys_reg_trace/aarch32/sys_reg_trace.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdbool.h>
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <lib/extensions/sys_reg_trace.h>
+
+static bool sys_reg_trace_supported(void)
+{
+	uint32_t features;
+
+	features = read_id_dfr0() >> ID_DFR0_COPTRC_SHIFT;
+	return ((features & ID_DFR0_COPTRC_MASK) ==
+		ID_DFR0_COPTRC_SUPPORTED);
+}
+
+void sys_reg_trace_enable(void)
+{
+	uint32_t val;
+
+	if (sys_reg_trace_supported()) {
+		/*
+		 * NSACR.NSTRCDIS = b0
+		 * enable NS system register access to implemented trace
+		 * registers.
+		 */
+		val = read_nsacr();
+		val &= ~NSTRCDIS_BIT;
+		write_nsacr(val);
+	}
+}
-- 
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