initial commit of lk (little kernel) project
diff --git a/kernel/debug.c b/kernel/debug.c
new file mode 100644
index 0000000..63af6d5
--- /dev/null
+++ b/kernel/debug.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2008 Travis Geiselbrecht
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <debug.h>
+#include <kernel/thread.h>
+#include <kernel/timer.h>
+#include <platform.h>
+
+#if defined(WITH_APP_CONSOLE)
+#include <app/console.h>
+
+static int cmd_threads(int argc, const cmd_args *argv);
+static int cmd_threadstats(int argc, const cmd_args *argv);
+static int cmd_threadload(int argc, const cmd_args *argv);
+
+STATIC_COMMAND_START
+#if DEBUGLEVEL > 1
+ { "threads", "list kernel threads", &cmd_threads },
+#endif
+#if THREAD_STATS
+ { "threadstats", "thread level statistics", &cmd_threadstats },
+ { "threadload", "toggle thread load display", &cmd_threadload },
+#endif
+STATIC_COMMAND_END(kernel);
+
+#if DEBUGLEVEL > 1
+static int cmd_threads(int argc, const cmd_args *argv)
+{
+ printf("thread list:\n");
+ dump_all_threads();
+
+ return 0;
+}
+#endif
+
+#if THREAD_STATS
+static int cmd_threadstats(int argc, const cmd_args *argv)
+{
+ printf("thread stats:\n");
+ printf("\ttotal idle time: %lld\n", thread_stats.idle_time);
+ printf("\ttotal busy time: %lld\n", current_time_hires() - thread_stats.idle_time);
+ printf("\treschedules: %d\n", thread_stats.reschedules);
+ printf("\tcontext_switches: %d\n", thread_stats.context_switches);
+ printf("\tpreempts: %d\n", thread_stats.preempts);
+ printf("\tyields: %d\n", thread_stats.yields);
+ printf("\tinterrupts: %d\n", thread_stats.interrupts);
+ printf("\ttimer interrupts: %d\n", thread_stats.timer_ints);
+ printf("\ttimers: %d\n", thread_stats.timers);
+
+ return 0;
+}
+
+static enum handler_return threadload(struct timer *t, time_t now, void *arg)
+{
+ static struct thread_stats old_stats;
+ static bigtime_t last_idle_time;
+
+ timer_set_oneshot(t, 1000, &threadload, NULL);
+
+ bigtime_t idle_time = thread_stats.idle_time;
+ if (current_thread == idle_thread) {
+ idle_time += current_time_hires() - thread_stats.last_idle_timestamp;
+ }
+ bigtime_t busy_time = 1000000ULL - (idle_time - last_idle_time);
+
+ uint busypercent = (busy_time * 10000) / (1000000);
+
+// printf("idle_time %lld, busytime %lld\n", idle_time - last_idle_time, busy_time);
+ printf("LOAD: %d.%02d%%, cs %d, ints %d, timer ints %d, timers %d\n", busypercent / 100, busypercent % 100,
+ thread_stats.context_switches - old_stats.context_switches,
+ thread_stats.interrupts - old_stats.interrupts,
+ thread_stats.timer_ints - old_stats.timer_ints,
+ thread_stats.timers - old_stats.timers);
+
+ old_stats = thread_stats;
+ last_idle_time = idle_time;
+
+ return INT_NO_RESCHEDULE;
+}
+
+static int cmd_threadload(int argc, const cmd_args *argv)
+{
+ static bool showthreadload = false;
+ static timer_t tltimer;
+
+ enter_critical_section();
+
+ if (showthreadload == false) {
+ // start the display
+ timer_initialize(&tltimer);
+ timer_set_oneshot(&tltimer, 1000, &threadload, NULL);
+ showthreadload = true;
+ } else {
+ timer_cancel(&tltimer);
+ showthreadload = false;
+ }
+
+ exit_critical_section();
+
+ return 0;
+}
+
+#endif
+
+#endif
+