Add time measurement command to u-boot

common/cmd_time.c

+/*
+ * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+/* time - run a command and report its run time */
+
+#include <common.h>
+#include <command.h>
+
+static void report_time(unsigned long int cycles)
+{
+#ifdef CONFIG_SYS_HZ
+        unsigned long int minutes, seconds, milliseconds;
+        unsigned long int total_seconds, remainder;
+
+        total_seconds = cycles / CONFIG_SYS_HZ;
+        remainder = cycles % CONFIG_SYS_HZ;
+        minutes = total_seconds / 60;
+        seconds = total_seconds % 60;
+        /* approximate millisecond value */
+        milliseconds = (remainder * 1000 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ;
+
+        printf("time:");
+        if (minutes)
+                printf(" %lu minutes,", minutes);
+        printf(" %lu.%03lu seconds,", seconds, milliseconds);
+        printf(" %lu ticks\n", cycles);
+#else
+        printf("CONFIG_SYS_HZ not defined\n");
+        printf("time: %lu ticks\n", cycles);
+#endif
+}
+
+int do_time(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+        const int target_argc = argc - 1;
+        int retval = 0;
+        unsigned long int cycles = 0;
+        cmd_tbl_t *target_cmdtp = NULL;
+
+        if (argc == 1) {
+                printf("no command provided\n");
+                return 1;
+        }
+
+        /* parse command */
+        target_cmdtp = find_cmd(argv[1]);
+        if (!target_cmdtp) {
+                printf("command not found: %s\n", argv[1]);
+                return 1;
+        }
+
+        if (target_argc > target_cmdtp->maxargs) {
+                printf("maxarags exceeded: %d > %d\n", target_argc,
+                                target_cmdtp->maxargs);
+                return 1;
+        }
+
+        /* run the command and report run time */
+        cycles = get_timer_masked();
+        retval = target_cmdtp->cmd(target_cmdtp, 0, target_argc, argv + 1);
+        cycles = get_timer_masked() - cycles;
+
+        putc('\n');
+        report_time(cycles);
+
+        return retval;
+}
+
+U_BOOT_CMD(time, CONFIG_SYS_MAXARGS, 0, do_time,
+                "run a command and report its run time",
+                "command [args...]\n"
+                "the return value of time is the return value of "
+                "the command it executed, "
+                "or non-zero if there is an internal error of time.\n");