util: ms command to calculate length of operations

This can be used to calculate approximate RTCK frequency
for instance.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

src/helper/util.c

@@ -0,0 +1,62 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Øyvind Harboe                                   *
+ *                                                                         *
+ *   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.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+/* this file contains various functionality useful to standalone systems */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "log.h"
+#include "time_support.h"
+
+static int
+util_Jim_Command_ms(Jim_Interp *interp,
+                                   int argc,
+		Jim_Obj * const *argv)
+{
+	if (argc != 1)
+	{
+		Jim_WrongNumArgs(interp, 1, argv, "ls ?dir?");
+		return JIM_ERR;
+	}
+
+	/* Cast from 64 to 32 bit int works for 2's-compliment
+	 * when calculating differences*/
+	Jim_SetResult(interp, Jim_NewIntObj(interp, (int)timeval_ms()));
+
+	return JIM_OK;
+}
+
+static const struct command_registration util_command_handlers[] = {
+	// jim handlers
+	{
+		.name = "ms",
+		.mode = COMMAND_ANY,
+		.jim_handler = util_Jim_Command_ms,
+		.help = "Returns ever increasing milliseconds. Used to calculuate differences in time.",
+		.usage = "",
+	},
+	COMMAND_REGISTRATION_DONE
+};
+
+int util_init(struct command_context *cmd_ctx)
+{
+	return register_commands(cmd_ctx, NULL, util_command_handlers);
+}