hw/cpu/a9mpcore: Verify the machine use Cortex-A9 cores

The 'Cortex-A9MPCore internal peripheral' block can only be
used with Cortex A5 and A9 cores. As we don't model the A5
yet, simply check the machine cpu core is a Cortex A9. If
not return an error.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20200709152337.15533-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/cpu/a9mpcore.c

@@ -15,6 +15,7 @@
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "hw/core/cpu.h"
+#include "cpu.h"
 
 #define A9_GIC_NUM_PRIORITY_BITS    5
 
@@ -52,8 +53,18 @@ static void a9mp_priv_realize(DeviceState *dev, Error **errp)
                  *wdtbusdev;
     int i;
     bool has_el3;
+    CPUState *cpu0;
     Object *cpuobj;
 
+    cpu0 = qemu_get_cpu(0);
+    cpuobj = OBJECT(cpu0);
+    if (strcmp(object_get_typename(cpuobj), ARM_CPU_TYPE_NAME("cortex-a9"))) {
+        /* We might allow Cortex-A5 once we model it */
+        error_setg(errp,
+                   "Cortex-A9MPCore peripheral can only use Cortex-A9 CPU");
+        return;
+    }
+
     scudev = DEVICE(&s->scu);
     qdev_prop_set_uint32(scudev, "num-cpu", s->num_cpu);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->scu), errp)) {
@@ -70,7 +81,6 @@ static void a9mp_priv_realize(DeviceState *dev, Error **errp)
     /* Make the GIC's TZ support match the CPUs. We assume that
      * either all the CPUs have TZ, or none do.
      */
-    cpuobj = OBJECT(qemu_get_cpu(0));
     has_el3 = object_property_find(cpuobj, "has_el3", NULL) &&
         object_property_get_bool(cpuobj, "has_el3", &error_abort);
     qdev_prop_set_bit(gicdev, "has-security-extensions", has_el3);