建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/log.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <metal/log.h>
+#include <metal/sys.h>
+
+void metal_default_log_handler(enum metal_log_level level,
+			       const char *format, ...)
+{
+#ifdef DEFAULT_LOGGER_ON
+	char msg[1024];
+	va_list args;
+	static const char *level_strs[] = {
+		"metal: emergency: ",
+		"metal: alert:     ",
+		"metal: critical:  ",
+		"metal: error:     ",
+		"metal: warning:   ",
+		"metal: notice:    ",
+		"metal: info:      ",
+		"metal: debug:     ",
+	};
+
+	va_start(args, format);
+	vsnprintf(msg, sizeof(msg), format, args);
+	va_end(args);
+
+	if (level <= METAL_LOG_EMERGENCY || level > METAL_LOG_DEBUG)
+		level = METAL_LOG_EMERGENCY;
+
+	fprintf(stderr, "%s%s", level_strs[level], msg);
+#else
+	(void)level;
+	(void)format;
+#endif
+}
+
+void metal_set_log_handler(metal_log_handler handler)
+{
+	_metal.common.log_handler = handler;
+}
+
+metal_log_handler metal_get_log_handler(void)
+{
+	return _metal.common.log_handler;
+}
+
+void metal_set_log_level(enum metal_log_level level)
+{
+	_metal.common.log_level = level;
+}
+
+enum metal_log_level metal_get_log_level(void)
+{
+	return _metal.common.log_level;
+}