[PATCH 7/9] hw/sysbus: Introduce dedicated struct SysBusState for TYPE_SYSTEM_BUS

[Bernhard Beschow <shentey@xxxxxxxxx>]

With this out of the way, in the next step, SysBusState gains attributes
for its memory and address recouces.

Signed-off-by: Bernhard Beschow <shentey@xxxxxxxxx>
---
 hw/core/sysbus.c              | 4 ++--
 include/hw/boards.h           | 3 ++-
 include/hw/misc/macio/macio.h | 2 +-
 include/hw/sysbus.h           | 8 ++++++--
 4 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index 16a9b4d7a0..1100f3ad6c 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -84,7 +84,7 @@ static void system_bus_class_init(ObjectClass *klass, void *data)
 static const TypeInfo system_bus_info = {
     .name = TYPE_SYSTEM_BUS,
     .parent = TYPE_BUS,
-    .instance_size = sizeof(BusState),
+    .instance_size = sizeof(SysBusState),
     .class_init = system_bus_class_init,
 };
 
@@ -343,7 +343,7 @@ BusState *sysbus_get_default(void)
         return NULL;
     }
 
-    return &current_machine->main_system_bus;
+    return &current_machine->main_system_bus.parent_obj;
 }
 
 static void sysbus_register_types(void)
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 7af940102d..63a4f990ea 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -11,6 +11,7 @@
 #include "qemu/module.h"
 #include "qom/object.h"
 #include "hw/core/cpu.h"
+#include "hw/sysbus.h"
 
 #define TYPE_MACHINE_SUFFIX "-machine"
 
@@ -346,7 +347,7 @@ struct MachineState {
      */
     MemoryRegion *ram;
     DeviceMemoryState *device_memory;
-    BusState main_system_bus;
+    SysBusState main_system_bus;
 
     ram_addr_t ram_size;
     ram_addr_t maxram_size;
diff --git a/include/hw/misc/macio/macio.h b/include/hw/misc/macio/macio.h
index 6c05f3bfd2..0944be587f 100644
--- a/include/hw/misc/macio/macio.h
+++ b/include/hw/misc/macio/macio.h
@@ -44,7 +44,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(MacIOBusState, MACIO_BUS)
 
 struct MacIOBusState {
     /*< private >*/
-    BusState parent_obj;
+    SysBusState parent_obj;
 };
 
 /* MacIO IDE */
diff --git a/include/hw/sysbus.h b/include/hw/sysbus.h
index 3564b7b6a2..5bb3b88501 100644
--- a/include/hw/sysbus.h
+++ b/include/hw/sysbus.h
@@ -11,9 +11,13 @@
 #define QDEV_MAX_PIO 32
 
 #define TYPE_SYSTEM_BUS "System"
-DECLARE_INSTANCE_CHECKER(BusState, SYSTEM_BUS,
-                         TYPE_SYSTEM_BUS)
+OBJECT_DECLARE_SIMPLE_TYPE(SysBusState, SYSTEM_BUS)
 
+struct SysBusState {
+    /*< private >*/
+    BusState parent_obj;
+    /*< public >*/
+};
 
 #define TYPE_SYS_BUS_DEVICE "sys-bus-device"
 OBJECT_DECLARE_TYPE(SysBusDevice, SysBusDeviceClass,
-- 
2.37.3