armv7m: Pass through start-powered-off CPU property

Expose "start-powered-off" as a property of the ARMv7M container,
which we just pass through to the CPU object in the same way that we
do for "init-svtor" and "idau". (We want this for the SSE-200, which
powers up only the first CPU at reset and leaves the second powered
down.)

As with the other CPU properties here, we can't just use alias
properties, because the CPU QOM object is not created until armv7m
realize time.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20190121185118.18550-4-peter.maydell@linaro.org

hw/arm/armv7m.c

@@ -182,6 +182,14 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
             return;
         }
     }
+    if (object_property_find(OBJECT(s->cpu), "start-powered-off", NULL)) {
+        object_property_set_bool(OBJECT(s->cpu), s->start_powered_off,
+                                 "start-powered-off", &err);
+        if (err != NULL) {
+            error_propagate(errp, err);
+            return;
+        }
+    }
 
     /*
      * Tell the CPU where the NVIC is; it will fail realize if it doesn't
@@ -250,6 +258,8 @@ static Property armv7m_properties[] = {
     DEFINE_PROP_LINK("idau", ARMv7MState, idau, TYPE_IDAU_INTERFACE, Object *),
     DEFINE_PROP_UINT32("init-svtor", ARMv7MState, init_svtor, 0),
     DEFINE_PROP_BOOL("enable-bitband", ARMv7MState, enable_bitband, false),
+    DEFINE_PROP_BOOL("start-powered-off", ARMv7MState, start_powered_off,
+                     false),
     DEFINE_PROP_END_OF_LIST(),
 };
 

include/hw/arm/armv7m.h

@@ -65,6 +65,7 @@ typedef struct ARMv7MState {
     Object *idau;
     uint32_t init_svtor;
     bool enable_bitband;
+    bool start_powered_off;
 } ARMv7MState;
 
 #endif