q800: move CPU object into Q800MachineState

Also change the instantiation of the CPU to use object_initialize_child()
followed by a separate realisation.
Restrict valid CPU types to m68040.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230621085353.113233-6-mark.cave-ayland@ilande.co.uk>
[lv: update commit message]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/m68k/q800.c

@@ -364,7 +364,7 @@ static uint8_t fake_mac_rom[] = {
 
 static void q800_machine_init(MachineState *machine)
 {
-    M68kCPU *cpu = NULL;
+    Q800MachineState *m = Q800_MACHINE(machine);
     int linux_boot;
     int32_t kernel_size;
     uint64_t elf_entry;
@@ -407,8 +407,9 @@ static void q800_machine_init(MachineState *machine)
     }
 
     /* init CPUs */
-    cpu = M68K_CPU(cpu_create(machine->cpu_type));
-    qemu_register_reset(main_cpu_reset, cpu);
+    object_initialize_child(OBJECT(machine), "cpu", &m->cpu, machine->cpu_type);
+    qdev_realize(DEVICE(&m->cpu), NULL, &error_fatal);
+    qemu_register_reset(main_cpu_reset, &m->cpu);
 
     /* RAM */
     memory_region_add_subregion(get_system_memory(), 0, machine->ram);
@@ -430,7 +431,8 @@ static void q800_machine_init(MachineState *machine)
 
     /* IRQ Glue */
     glue = qdev_new(TYPE_GLUE);
-    object_property_set_link(OBJECT(glue), "cpu", OBJECT(cpu), &error_abort);
+    object_property_set_link(OBJECT(glue), "cpu", OBJECT(&m->cpu),
+                             &error_abort);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(glue), &error_fatal);
 
     /* VIA 1 */
@@ -605,7 +607,7 @@ static void q800_machine_init(MachineState *machine)
 
     macfb_mode = (NUBUS_MACFB(dev)->macfb).mode;
 
-    cs = CPU(cpu);
+    cs = CPU(&m->cpu);
     if (linux_boot) {
         uint64_t high;
         void *param_blob, *param_ptr, *param_rng_seed;
@@ -735,6 +737,11 @@ static GlobalProperty hw_compat_q800[] = {
 };
 static const size_t hw_compat_q800_len = G_N_ELEMENTS(hw_compat_q800);
 
+static const char *q800_machine_valid_cpu_types[] = {
+    M68K_CPU_TYPE_NAME("m68040"),
+    NULL
+};
+
 static void q800_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
@@ -742,6 +749,7 @@ static void q800_machine_class_init(ObjectClass *oc, void *data)
     mc->desc = "Macintosh Quadra 800";
     mc->init = q800_machine_init;
     mc->default_cpu_type = M68K_CPU_TYPE_NAME("m68040");
+    mc->valid_cpu_types = q800_machine_valid_cpu_types;
     mc->max_cpus = 1;
     mc->block_default_type = IF_SCSI;
     mc->default_ram_id = "m68k_mac.ram";

include/hw/m68k/q800.h

@@ -25,6 +25,7 @@
 
 #include "hw/boards.h"
 #include "qom/object.h"
+#include "target/m68k/cpu-qom.h"
 
 /*
  * The main Q800 machine
@@ -32,6 +33,8 @@
 
 struct Q800MachineState {
     MachineState parent_obj;
+
+    M68kCPU cpu;
 };
 
 #define TYPE_Q800_MACHINE MACHINE_TYPE_NAME("q800")