1 files changed, 57 insertions, 0 deletions
diff --git a/lib/trusted_os/trusted_os.c b/lib/trusted_os/trusted_os.c
new file mode 100644
index 0000000..3c9fcf1
--- /dev/null
+++ b/lib/trusted_os/trusted_os.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2014, ARM Limited. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of the ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <smc.h>
+#include <tftf.h>
+#include <trusted_os.h>
+#include <uuid_utils.h>
+
+unsigned int is_trusted_os_present(uuid_t *tos_uuid)
+{
+	smc64_args tos_uid_args = { TOS_UID };
+	smc64_ret_values ret;
+	uint32_t *tos_uuid32;
+
+	ret = tftf_smc64(&tos_uid_args);
+
+	if ((ret.ret0 == SMC_UNKNOWN) ||
+	    ((ret.ret0 == 0) && (ret.ret1 == 0) && (ret.ret2 == 0) &&
+	     (ret.ret3 == 0)))
+		return 0;
+
+	tos_uuid32 = (uint32_t *) tos_uuid;
+	tos_uuid32[0] = ret.ret0;
+	tos_uuid32[1] = ret.ret1;
+	tos_uuid32[2] = ret.ret2;
+	tos_uuid32[3] = ret.ret3;
+
+	return 1;
+}