hw/arm_gic: Make gic_reset a sysbus reset function

Make gic_reset a sysbus reset function, so we actually
reset the GIC on system reset rather than only at init.
For the NVIC this requires us also to implement reset
of the SysTick.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/hw/armv7m_nvic.c b/hw/armv7m_nvic.c
index 79cf448678..5cfa971cab 100644
--- a/hw/armv7m_nvic.c
+++ b/hw/armv7m_nvic.c
@@ -76,6 +76,14 @@ static void systick_timer_tick(void * opaque)
     }
 }
 
+static void systick_reset(nvic_state *s)
+{
+    s->systick.control = 0;
+    s->systick.reload = 0;
+    s->systick.tick = 0;
+    qemu_del_timer(s->systick.timer);
+}
+
 /* The external routines use the hardware vector numbering, ie. the first
    IRQ is #16.  The internal GIC routines use #32 as the first IRQ.  */
 void armv7m_nvic_set_pending(void *opaque, int irq)
@@ -371,6 +379,13 @@ static const VMStateDescription vmstate_nvic = {
     }
 };
 
+static void armv7m_nvic_reset(DeviceState *dev)
+{
+    nvic_state *s = FROM_SYSBUSGIC(nvic_state, sysbus_from_qdev(dev));
+    gic_reset(&s->gic.busdev.qdev);
+    systick_reset(s);
+}
+
 static int armv7m_nvic_init(SysBusDevice *dev)
 {
     nvic_state *s= FROM_SYSBUSGIC(nvic_state, dev);
@@ -400,6 +415,7 @@ static void armv7m_nvic_class_init(ObjectClass *klass, void *data)
 
     sdc->init = armv7m_nvic_init;
     dc->vmsd  = &vmstate_nvic;
+    dc->reset = armv7m_nvic_reset;
     dc->props = armv7m_nvic_properties;
 }