timer: repeat support and running status

kernel-src/include/kernel/timer.h

@@ -4,10 +4,12 @@
 #include <time.h>
 #include <arch/context.h>
 #include <spinlock.h>
+#include <stdbool.h>
 
 typedef struct timerentry_t {
 	struct timerentry_t *next;
 	time_t absolutetick;
+	time_t repeatus;
 	void *private;
 	void (*func)(void *private, context_t* context);
 } timerentry_t;
@@ -16,6 +18,7 @@ typedef struct {
 	spinlock_t lock;
 	time_t ticksperus;
 	time_t tickcurrent;
+	bool running;
 	void (*arm)(time_t);
 	time_t (*stop)();
 	timerentry_t *queue;

kernel-src/sys/timer.c

@@ -3,60 +3,13 @@
 #include <logging.h>
 #include <kernel/interrupt.h>
 
-void timer_isr(timer_t *timer, context_t *context) {
-	spinlock_acquire(&timer->lock);
-	__assert(timer->queue);
-	timer->tickcurrent = timer->queue->absolutetick;
-	timerentry_t *oldentry = timer->queue;
-	timer->queue = timer->queue->next;
-
-	if (timer->queue) {
-		// TODO handle this
-		__assert(timer->queue->absolutetick > timer->tickcurrent);
-		timer->arm(timer->queue->absolutetick - timer->tickcurrent);
-	}
-
-	spinlock_release(&timer->lock);
-	oldentry->func(oldentry->private, context);
-}
-
-void timer_resume(timer_t *timer) {
-	spinlock_acquire(&timer->lock);
-
-	if (timer->queue == NULL)
-		goto leave;
-
-	// TODO handle difference being 0
-	__assert(timer->queue->absolutetick > timer->tickcurrent);
-	timer->arm(timer->queue->absolutetick - timer->tickcurrent);
-
-	leave:
-	spinlock_release(&timer->lock);
-}
-
-void timer_stop(timer_t *timer) {
-	long oldipl = interrupt_setipl(IPL_TIMER);
-	spinlock_acquire(&timer->lock);
-
-	timer->tickcurrent += timer->stop(timer);
-
-	spinlock_release(&timer->lock);
-	interrupt_setipl(oldipl);
-}
-
-void timer_insert(timer_t *timer, timerentry_t* entry, time_t us) {
-	long oldipl = interrupt_setipl(IPL_TIMER);
-	spinlock_acquire(&timer->lock);
-
-	timer->tickcurrent += timer->stop(timer);
-
-	time_t tickdiff = us * timer->ticksperus;
-	entry->absolutetick = timer->tickcurrent + tickdiff;
+static void insert(timer_t *timer, timerentry_t *entry, time_t us) {
+	entry->absolutetick = timer->tickcurrent + us * timer->ticksperus;
 
 	if (timer->queue == NULL) { // if no other entries in the queue
 		entry->next = NULL;
 		timer->queue = entry;
-	}else if (timer->queue->absolutetick > entry->absolutetick) { // if the current entry should be put before all the others in the queue
+	} else if (timer->queue->absolutetick > entry->absolutetick) { // if the current entry should be put before all the others in the queue
 		entry->next = timer->queue;
 		timer->queue = entry;
 	} else {
@@ -75,6 +28,71 @@ void timer_insert(timer_t *timer, timerentry_t* entry, time_t us) {
 			search = search->next;
 		}
 	}
+}
+
+void timer_isr(timer_t *timer, context_t *context) {
+	spinlock_acquire(&timer->lock);
+
+	__assert(timer->queue);
+	timer->tickcurrent = timer->queue->absolutetick;
+	timerentry_t *oldentry = timer->queue;
+	timer->queue = timer->queue->next;
+
+	oldentry->func(oldentry->private, context);
+
+	if (oldentry->repeatus)
+		insert(timer, oldentry, oldentry->repeatus);
+
+	if (timer->queue) {
+		// TODO handle this
+		__assert(timer->queue->absolutetick > timer->tickcurrent);
+		timer->arm(timer->queue->absolutetick - timer->tickcurrent);
+	}
+
+	spinlock_release(&timer->lock);
+}
+
+void timer_resume(timer_t *timer) {
+	spinlock_acquire(&timer->lock);
+
+	timer->running = true;
+
+	if (timer->queue == NULL)
+		goto leave;
+
+	// TODO handle difference being 0
+	__assert(timer->queue->absolutetick > timer->tickcurrent);
+	timer->arm(timer->queue->absolutetick - timer->tickcurrent);
+
+	leave:
+	spinlock_release(&timer->lock);
+}
+
+void timer_stop(timer_t *timer) {
+	long oldipl = interrupt_setipl(IPL_TIMER);
+	spinlock_acquire(&timer->lock);
+
+	timer->tickcurrent += timer->stop(timer);
+	timer->running = false;
+
+	spinlock_release(&timer->lock);
+	interrupt_setipl(oldipl);
+}
+
+void timer_insert(timer_t *timer, timerentry_t* entry, time_t us) {
+	long oldipl = interrupt_setipl(IPL_TIMER);
+	spinlock_acquire(&timer->lock);
+
+	if (timer->running)
+		timer->tickcurrent += timer->stop(timer);
+
+	insert(timer, entry, us);
+
+	if (timer->running) {
+		// TODO handle difference being 0
+		__assert(timer->queue->absolutetick > timer->tickcurrent);
+		timer->arm(timer->queue->absolutetick - timer->tickcurrent);
+	}
 
 	spinlock_release(&timer->lock);
 	interrupt_setipl(oldipl);
@@ -86,6 +104,7 @@ timer_t *timer_new(time_t ticksperus, void (*arm)(time_t), time_t (*stop)()) {
 		return NULL;
 
 	timer->ticksperus = ticksperus;
+	timer->running = false;
 	timer->arm = arm;
 	timer->stop = stop;
 	SPINLOCK_INIT(timer->lock);