#include "sc14480.h"
#include "cpu-qom.h"
#include "system/address-spaces.h"
#include "hw/core/cpu.h"
#include "hw/cr16c/boot.h"
#include "qapi/error.h"
#include "qemu/datadir.h"
#include "qemu/units.h"


static void sc14480_realize(DeviceState* dev, Error** errp)
{
    SC14480McuState* s = SC14480_MCU(dev);

    object_initialize_child(OBJECT(dev), "cpu", &s->cpu, TYPE_CR16C_CPU);
    object_property_set_bool(OBJECT(&s->cpu), "realized", true, &error_abort);

    memory_region_init_ram(&s->non_shared_ram_or_icache, OBJECT(dev), "non_shared_ram_or_icache", 24*KiB, &error_fatal);
    memory_region_init_ram(&s->non_shared_ram_or_dcache, OBJECT(dev), "non_shared_ram_or_dcache",  8*KiB, &error_fatal);
    memory_region_init_ram(&s->shared_int_ram,           OBJECT(dev), "shared_int_ram",           64*KiB, &error_fatal);
    memory_region_init_rom(&s->boot_rom,                 OBJECT(dev), "boot_rom",                  2*KiB, &error_fatal);
    memory_region_add_subregion(get_system_memory(), 0x00000, &s->non_shared_ram_or_icache);
    memory_region_add_subregion(get_system_memory(), 0x08000, &s->non_shared_ram_or_dcache);
    memory_region_add_subregion(get_system_memory(), 0x10000, &s->shared_int_ram);
    memory_region_add_subregion(get_system_memory(), 0xFEF00, &s->boot_rom);

    char* bios_path = qemu_find_file(QEMU_FILE_TYPE_BIOS, "sc14480-bios.img");
    if (!cr16c_load_firmware(&s->cpu, &s->boot_rom, bios_path)) {
        exit(1);
    }
}

static void sc14480_reset_hold(Object *obj, ResetType type) {
    SC14480McuClass* mcu_class = SC14480_MCU_GET_CLASS(obj);
    SC14480McuState* mcu_state = SC14480_MCU(obj);
    CR16CCPU* cpu = &mcu_state->cpu;
    CPUState* cpu_state = CPU(cpu);

    if (mcu_class->parent_phases.hold) {
        mcu_class->parent_phases.hold(obj, type);
    }

    cpu_reset(cpu_state);
    cpu_set_pc(cpu_state, 0xFEF00);
}

static void sc14480_class_init(ObjectClass* oc, const void* data)
{
    DeviceClass* dc = DEVICE_CLASS(oc);
    SC14480McuClass* sc14480 = SC14480_MCU_CLASS(oc);
    ResettableClass *rc = RESETTABLE_CLASS(oc);

    resettable_class_set_parent_phases(rc, NULL, sc14480_reset_hold, NULL, &sc14480->parent_phases);

    dc->realize = sc14480_realize;
}

static const TypeInfo sc14480_mcu_types[] = {
    {
        .name = TYPE_SC14480_MCU,
        .parent = TYPE_SYS_BUS_DEVICE,
        .instance_size = sizeof(SC14480McuState),
        .class_size = sizeof(SC14480McuClass),
        .class_init = sc14480_class_init,
    },
};
DEFINE_TYPES(sc14480_mcu_types)