diff --git a/core/timer.c b/core/timer.c
index 737fb78..d5a3477 100644
--- a/core/timer.c
+++ b/core/timer.c
@@ -109,7 +109,7 @@ uint64_t schedule_timer(struct timer *t, uint64_t how_long)
 	return now;
 }
 
-static void __check_poll_timers(void)
+static void __check_poll_timers(uint64_t now)
 {
 	struct timer *t;
 
@@ -153,7 +153,7 @@ static void __check_poll_timers(void)
 
 		/* Now we can unlock and call it's expiry */
 		unlock(&timer_lock);
-		t->expiry(t, t->user_data);
+		t->expiry(t, t->user_data, now);
 
 		/* Re-lock and mark not running */
 		lock(&timer_lock);
@@ -187,7 +187,7 @@ static void __check_timers(uint64_t now)
 
 		/* Now we can unlock and call it's expiry */
 		unlock(&timer_lock);
-		t->expiry(t, t->user_data);
+		t->expiry(t, t->user_data, now);
 
 		/* Re-lock and mark not running */
 		lock(&timer_lock);
@@ -216,7 +216,7 @@ void check_timers(bool from_interrupt)
 	/* Take lock and try again */
 	lock(&timer_lock);
 	if (!from_interrupt)
-		__check_poll_timers();
+		__check_poll_timers(now);
 	__check_timers(now);
 	unlock(&timer_lock);
 }
diff --git a/hw/bt.c b/hw/bt.c
index 23fc68c..41fe24e 100644
--- a/hw/bt.c
+++ b/hw/bt.c
@@ -293,12 +293,10 @@ static void bt_get_resp(void)
 	return;
 }
 
-static void bt_expire_old_msg(void)
+static void bt_expire_old_msg(uint64_t tb)
 {
-	unsigned long tb;
 	struct bt_msg *bt_msg;
 
-	tb = mftb();
 	bt_msg = list_top(&bt.msgq, struct bt_msg, link);
 
 	if (bt_msg && bt_msg->tb > 0 && (bt_msg->tb + BT_MSG_TIMEOUT) < tb) {
@@ -309,7 +307,7 @@ static void bt_expire_old_msg(void)
 			FIFO so just reset the flag.*/
 			BT_ERR(bt_msg, "Retry sending message");
 			bt_msg->retry_count++;
-			bt_msg->tb = mftb();
+			bt_msg->tb = tb;
 			bt_outb(BT_CTRL_H2B_ATN, BT_CTRL);
 		} else {
 			BT_ERR(bt_msg, "Timeout sending message");
@@ -356,7 +354,8 @@ static void bt_send_and_unlock(void)
 	return;
 }
 
-static void bt_poll(struct timer *t __unused, void *data __unused)
+static void bt_poll(struct timer *t __unused, void *data __unused,
+		    uint64_t now)
 {
 	uint8_t bt_ctrl;
 
@@ -369,7 +368,7 @@ static void bt_poll(struct timer *t __unused, void *data __unused)
 	lock(&bt.lock);
 
 	print_debug_queue_info();
-	bt_expire_old_msg();
+	bt_expire_old_msg(now);
 
 	bt_ctrl = bt_inb(BT_CTRL);
 
@@ -447,7 +446,7 @@ static void bt_irq(uint32_t chip_id __unused, uint32_t irq_mask __unused)
 	bt.irq_ok = true;
 	if (ireg & BT_INTMASK_B2H_IRQ) {
 		bt_outb(BT_INTMASK_B2H_IRQ | BT_INTMASK_B2H_IRQEN, BT_INTMASK);
-		bt_poll(NULL, NULL);
+		bt_poll(NULL, NULL, mftb());
 	}
 }
 
diff --git a/hw/ipmi/ipmi-watchdog.c b/hw/ipmi/ipmi-watchdog.c
index 7dfb0c0..55c3bf5 100644
--- a/hw/ipmi/ipmi-watchdog.c
+++ b/hw/ipmi/ipmi-watchdog.c
@@ -100,7 +100,8 @@ static void sync_reset_wdt(void)
 		ipmi_queue_msg_sync(ipmi_msg);
 }
 
-static void reset_wdt(struct timer *t __unused, void *data __unused)
+static void reset_wdt(struct timer *t __unused, void *data __unused,
+		      uint64_t now __unused)
 {
 	struct ipmi_msg *ipmi_msg;
 
diff --git a/hw/p8-i2c.c b/hw/p8-i2c.c
index dfb26d4..848d400 100644
--- a/hw/p8-i2c.c
+++ b/hw/p8-i2c.c
@@ -1048,7 +1048,7 @@ static inline uint64_t p8_i2c_get_poll_interval(uint32_t bus_speed)
 	return usecs_to_tb(usec);
 }
 
-static void p8_i2c_timeout(struct timer *t __unused, void *data)
+static void p8_i2c_timeout(struct timer *t __unused, void *data, uint64_t now)
 {
 	struct p8_i2c_master_port *port;
 	struct p8_i2c_master *master = data;
@@ -1073,7 +1073,7 @@ static void p8_i2c_timeout(struct timer *t __unused, void *data)
 		goto exit;
 	}
 	request = container_of(req, struct p8_i2c_request, req);
-	if (tb_compare(mftb(), request->timeout) == TB_ABEFOREB) {
+	if (tb_compare(now, request->timeout) == TB_ABEFOREB) {
 		DBG("I2C: Timeout with request not expired\n");
 		goto exit;
 	}
@@ -1094,12 +1094,14 @@ static void p8_i2c_timeout(struct timer *t __unused, void *data)
 	unlock(&master->lock);
 }
 
-static void p8_i2c_recover(struct timer *t __unused, void *data)
+static void p8_i2c_recover(struct timer *t __unused, void *data,
+			   uint64_t now __unused)
 {
 	struct p8_i2c_master *master = data;
 
 	lock(&master->lock);
-	assert(master->state == state_recovery || master->state == state_occache_dis);
+	assert(master->state == state_recovery ||
+	       master->state == state_occache_dis);
 	master->state = state_idle;
 
 	/* We may or may not still have work pending, re-enable the sensor cache
@@ -1117,7 +1119,8 @@ static void p8_i2c_recover(struct timer *t __unused, void *data)
 	unlock(&master->lock);
 }
 
-static void p8_i2c_enable_scache(struct timer *t __unused, void *data)
+static void p8_i2c_enable_scache(struct timer *t __unused, void *data,
+				 uint64_t now __unused)
 {
 	struct p8_i2c_master *master = data;
 
@@ -1132,7 +1135,7 @@ static void p8_i2c_enable_scache(struct timer *t __unused, void *data)
 	unlock(&master->lock);
 }
 
-static void p8_i2c_poll(struct timer *t __unused, void *data)
+static void p8_i2c_poll(struct timer *t __unused, void *data, uint64_t now)
 {
 	struct p8_i2c_master *master = data;
 
@@ -1149,7 +1152,7 @@ static void p8_i2c_poll(struct timer *t __unused, void *data)
 	lock(&master->lock);
 	p8_i2c_check_status(master);
 	if (master->state != state_idle)
-		schedule_timer(&master->poller, master->poll_interval);
+		schedule_timer_at(&master->poller, now + master->poll_interval);
 	p8_i2c_check_work(master);
 	unlock(&master->lock);
 }
diff --git a/include/timer.h b/include/timer.h
index a1132e0..116b9ac 100644
--- a/include/timer.h
+++ b/include/timer.h
@@ -6,7 +6,7 @@
 
 struct timer;
 
-typedef void (*timer_func_t)(struct timer *t, void *data);
+typedef void (*timer_func_t)(struct timer *t, void *data, uint64_t now);
 
 /* Structure exposed in order to be able to allocate it
  * statically but otherwise, use accessors, don't access
