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-rw-r--r--include/runtime_services/trusted_os.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/include/runtime_services/trusted_os.h b/include/runtime_services/trusted_os.h
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+++ b/include/runtime_services/trusted_os.h
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+/*
+ * Copyright (c) 2018, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * Definitions related to the Trusted OS Service as per the SMC Calling
+ * Convention.
+ */
+
+#ifndef __TRUSTED_OS_H__
+#define __TRUSTED_OS_H__
+
+#include <uuid.h>
+
+/* Trusted OS Function IDs that fall under Trusted OS call range */
+#define SMC_TOS_CALL_COUNT 0xbf00ff00
+#define SMC_TOS_UID 0xbf00ff01
+/* 0xbf00ff02 is reserved */
+#define SMC_TOS_REVISION 0xbf00ff03
+
+/*
+ * Detect whether a Trusted OS is present in the software stack.
+ * This is implemented using the Trusted OS UID SMC call.
+ *
+ * If a Trusted OS is detected then this function returns 1
+ * and populates 'tos_uuid' with the UUID of the detected Trusted OS.
+ * Otherwise, this function returns 0 and the value pointed by 'tos_uuid'
+ * should be ignored.
+ */
+unsigned int is_trusted_os_present(uuid_t *tos_uuid);
+
+#endif /* __TRUSTED_OS_H__ */