[PATCH] hw/timer/armv7m_systick: assert that board code set system_clock_scale

[Peter Maydell <peter.maydell@linaro.org>]

It is the responsibility of board code for an armv7m system to set
system_clock_scale appropriately for the CPU speed of the core.
If it forgets to do this, then QEMU will hang if the guest tries
to use the systick timer in the "tick at the CPU clock frequency" mode.

We forgot that in a couple of our boards (see commits ce4f70e81ed23c93f,
e7e5a9595ab1136). Add an assertion in the systick reset method so
we don't let any new boards in with the same bug.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
In the longer term we should make this a clocktree input and
plumb it through the armv7m container and so on, but for the
moment this assert() improves the current situation.
---
 hw/timer/armv7m_systick.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/timer/armv7m_systick.c b/hw/timer/armv7m_systick.c
index 74c58bcf245..a8cec7eb56b 100644
--- a/hw/timer/armv7m_systick.c
+++ b/hw/timer/armv7m_systick.c
@@ -202,6 +202,14 @@ static void systick_reset(DeviceState *dev)
 {
     SysTickState *s = SYSTICK(dev);
 
+    /*
+     * Forgetting to set system_clock_scale is always a board code
+     * bug. We can't check this earlier because for some boards
+     * (like stellaris) it is not yet configured at the point where
+     * the systick device is realized.
+     */
+    assert(system_clock_scale != 0);
+
     s->control = 0;
     s->reload = 0;
     s->tick = 0;
-- 
2.20.1