diff --git a/src/debug.c b/src/debug.c
new file mode 100644
index 0000000..a814224
--- /dev/null
+++ b/src/debug.c
@@ -0,0 +1,52 @@
+/* Debugging/Logging support code */
+/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#include <openbsc/debug.h>
+
+static unsigned int debug_mask = 0xffffffff & ~DMI;
+
+void debugp(unsigned int subsys, char *file, int line, const char *format, ...)
+{
+	char *timestr;
+	va_list ap;
+	time_t tm;
+	FILE *outfd = stderr;
+
+	if (!(debug_mask & subsys))
+		return;
+
+	va_start(ap, format);
+
+	tm = time(NULL);
+	timestr = ctime(&tm);
+	timestr[strlen(timestr)-1] = '\0';
+	fprintf(outfd, "%s <%4.4x> %s:%d ", timestr, subsys, file, line);
+	vfprintf(outfd, format, ap);
+
+	va_end(ap);
+
+	fflush(outfd);
+}
+