1 files changed, 108 insertions, 0 deletions
diff --git a/sys/kern/kern_idle.c b/sys/kern/kern_idle.c
new file mode 100644
index 0000000..840c0f9
--- /dev/null
+++ b/sys/kern/kern_idle.c
@@ -0,0 +1,108 @@
+/*-
+ * Copyright (c) 2000, All rights reserved.  See /usr/src/COPYRIGHT
+ *
+ * $FreeBSD$
+ */
+
+#include "opt_ktrace.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/ktr.h>
+#include <sys/signalvar.h>
+#include <sys/resourcevar.h>
+#include <sys/vmmeter.h>
+#include <sys/sysctl.h>
+#include <sys/unistd.h>
+#include <sys/kthread.h>
+#include <sys/queue.h>
+#include <vm/vm.h>
+#include <vm/vm_extern.h>
+#ifdef KTRACE
+#include <sys/uio.h>
+#include <sys/ktrace.h>
+#endif
+
+#include <machine/cpu.h>
+#include <machine/ipl.h>
+#include <machine/mutex.h>
+#include <machine/smp.h>
+
+#include <machine/globaldata.h>
+#include <machine/globals.h>
+
+#ifdef SMP_DEBUG
+#include <sys/bus.h>
+#include <i386/isa/icu.h>
+#include <i386/isa/intr_machdep.h>
+#endif
+
+static void idle_setup(void *dummy);
+SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
+
+static void idle_proc(void *dummy);
+
+/*
+ * setup per-cpu idle process contexts
+ */
+static void
+idle_setup(void *dummy)
+{
+	struct globaldata *gd;
+	int error;
+
+	SLIST_FOREACH(gd, &cpuhead, gd_allcpu) {
+#ifdef SMP
+		error = kthread_create(idle_proc, NULL, &gd->gd_idleproc,
+				       RFSTOPPED|RFHIGHPID, "idle: cpu%d",
+				       gd->gd_cpuid);
+#else
+		error = kthread_create(idle_proc, NULL, &gd->gd_idleproc,
+				       RFSTOPPED|RFHIGHPID, "idle");
+#endif
+		if (error)
+			panic("idle_setup: kthread_create error %d\n", error);
+
+		gd->gd_idleproc->p_stat = SWAIT;
+	}
+}
+
+/*
+ * idle process context
+ */
+static void
+idle_proc(void *dummy)
+{
+	int count;
+
+	for (;;) {
+		/*
+		 * Clear switchtime, which prevents the idle process's time
+		 * from being counted.
+		switchtime.tv_usec = 0;
+		switchtime.tv_sec = 0;
+		 */
+
+		mtx_assert(&Giant, MA_NOTOWNED);
+
+		count = 0;
+
+		while (count >= 0 && procrunnable() == 0) {
+		/*
+		 * This is a good place to put things to be done in
+		 * the background, including sanity checks.
+		 */
+			if (count++ < 0)
+				CTR0(KTR_PROC, "idle_proc: timed out waiting"
+				    " for a process");
+		}
+
+		mtx_enter(&sched_lock, MTX_SPIN);
+		idleproc->p_stat = SWAIT;
+		mi_switch();
+		mtx_exit(&sched_lock, MTX_SPIN);
+		spl0();
+	}
+}