hw/mips/loongson3_virt.c

/*
 * Generic Loongson-3 Platform support
 *
 * Copyright (c) 2018-2020 Huacai Chen (chenhc@lemote.com)
 * Copyright (c) 2018-2020 Jiaxun Yang <jiaxun.yang@flygoat.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

/*
 * Generic virtualized PC Platform based on Loongson-3 CPU (MIPS64R2 with
 * extensions, 800~2000MHz)
 */

#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/cutils.h"
#include "qemu/datadir.h"
#include "qapi/error.h"
#include "elf.h"
#include "hw/char/serial.h"
#include "hw/intc/loongson_liointc.h"
#include "hw/mips/mips.h"
#include "hw/mips/cpudevs.h"
#include "hw/mips/fw_cfg.h"
#include "hw/mips/loongson3_bootp.h"
#include "hw/misc/unimp.h"
#include "hw/intc/i8259.h"
#include "hw/loader.h"
#include "hw/isa/superio.h"
#include "hw/pci/msi.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_host.h"
#include "hw/pci-host/gpex.h"
#include "hw/usb.h"
#include "net/net.h"
#include "sysemu/kvm.h"
#include "sysemu/qtest.h"
#include "sysemu/reset.h"
#include "sysemu/runstate.h"
#include "qemu/error-report.h"

#define PM_CNTL_MODE          0x10

#define LOONGSON_MAX_VCPUS      16

/*
 * Loongson-3's virtual machine BIOS can be obtained here:
 * 1, https://github.com/loongson-community/firmware-nonfree
 * 2, http://dev.lemote.com:8000/files/firmware/UEFI/KVM/bios_loongson3.bin
 */
#define LOONGSON3_BIOSNAME "bios_loongson3.bin"

#define UART_IRQ            0
#define RTC_IRQ             1
#define PCIE_IRQ_BASE       2

const MemMapEntry virt_memmap[] = {
    [VIRT_LOWMEM] =      { 0x00000000,    0x10000000 },
    [VIRT_PM] =          { 0x10080000,         0x100 },
    [VIRT_FW_CFG] =      { 0x10080100,         0x100 },
    [VIRT_RTC] =         { 0x10081000,        0x1000 },
    [VIRT_PCIE_PIO] =    { 0x18000000,       0x80000 },
    [VIRT_PCIE_ECAM] =   { 0x1a000000,     0x2000000 },
    [VIRT_BIOS_ROM] =    { 0x1fc00000,      0x200000 },
    [VIRT_UART] =        { 0x1fe001e0,           0x8 },
    [VIRT_LIOINTC] =     { 0x3ff01400,          0x64 },
    [VIRT_PCIE_MMIO] =   { 0x40000000,    0x40000000 },
    [VIRT_HIGHMEM] =     { 0x80000000,           0x0 }, /* Variable */
};

static const MemMapEntry loader_memmap[] = {
    [LOADER_KERNEL] =    { 0x00000000,     0x4000000 },
    [LOADER_INITRD] =    { 0x04000000,           0x0 }, /* Variable */
    [LOADER_CMDLINE] =   { 0x0ff00000,      0x100000 },
};

static const MemMapEntry loader_rommap[] = {
    [LOADER_BOOTROM] =   { 0x1fc00000,        0x1000 },
    [LOADER_PARAM] =     { 0x1fc01000,       0x10000 },
};

struct LoongsonMachineState {
    MachineState parent_obj;
    MemoryRegion *pio_alias;
    MemoryRegion *mmio_alias;
    MemoryRegion *ecam_alias;
};
typedef struct LoongsonMachineState LoongsonMachineState;

#define TYPE_LOONGSON_MACHINE  MACHINE_TYPE_NAME("loongson3-virt")
DECLARE_INSTANCE_CHECKER(LoongsonMachineState, LOONGSON_MACHINE, TYPE_LOONGSON_MACHINE)

static struct _loaderparams {
    uint64_t cpu_freq;
    uint64_t ram_size;
    const char *kernel_cmdline;
    const char *kernel_filename;
    const char *initrd_filename;
    uint64_t kernel_entry;
    uint64_t a0, a1, a2;
} loaderparams;

static uint64_t loongson3_pm_read(void *opaque, hwaddr addr, unsigned size)
{
    return 0;
}

static void loongson3_pm_write(void *opaque, hwaddr addr,
                               uint64_t val, unsigned size)
{
    if (addr != PM_CNTL_MODE) {
        return;
    }

    switch (val) {
    case 0x00:
        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
        return;
    case 0xff:
        qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
        return;
    default:
        return;
    }
}

static const MemoryRegionOps loongson3_pm_ops = {
    .read  = loongson3_pm_read,
    .write = loongson3_pm_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
    .valid = {
        .min_access_size = 1,
        .max_access_size = 1
    }
};

#define DEF_LOONGSON3_FREQ (800 * 1000 * 1000)

static uint64_t get_cpu_freq_hz(void)
{
#ifdef CONFIG_KVM
    int ret;
    uint64_t freq;
    struct kvm_one_reg freq_reg = {
        .id = KVM_REG_MIPS_COUNT_HZ,
        .addr = (uintptr_t)(&freq)
    };

    if (kvm_enabled()) {
        ret = kvm_vcpu_ioctl(first_cpu, KVM_GET_ONE_REG, &freq_reg);
        if (ret >= 0) {
            return freq * 2;
        }
    }
#endif
    return DEF_LOONGSON3_FREQ;
}

static void init_boot_param(void)
{
    static void *p;
    struct boot_params *bp;

    p = g_malloc0(loader_rommap[LOADER_PARAM].size);
    bp = p;

    bp->efi.smbios.vers = cpu_to_le16(1);
    init_reset_system(&(bp->reset_system));
    p += ROUND_UP(sizeof(struct boot_params), 64);
    init_loongson_params(&(bp->efi.smbios.lp), p,
                         loaderparams.cpu_freq, loaderparams.ram_size);

    rom_add_blob_fixed("params_rom", bp,
                       loader_rommap[LOADER_PARAM].size,
                       loader_rommap[LOADER_PARAM].base);

    g_free(bp);

    loaderparams.a2 = cpu_mips_phys_to_kseg0(NULL,
                                             loader_rommap[LOADER_PARAM].base);
}

static void init_boot_rom(void)
{
    const unsigned int boot_code[] = {
        0x40086000,   /* mfc0    t0, CP0_STATUS                               */
        0x240900E4,   /* li      t1, 0xe4         #set kx, sx, ux, erl        */
        0x01094025,   /* or      t0, t0, t1                                   */
        0x3C090040,   /* lui     t1, 0x40         #set bev                    */
        0x01094025,   /* or      t0, t0, t1                                   */
        0x40886000,   /* mtc0    t0, CP0_STATUS                               */
        0x00000000,
        0x40806800,   /* mtc0    zero, CP0_CAUSE                              */
        0x00000000,
        0x400A7801,   /* mfc0    t2, $15, 1                                   */
        0x314A00FF,   /* andi    t2, 0x0ff                                    */
        0x3C089000,   /* dli     t0, 0x900000003ff01000                       */
        0x00084438,
        0x35083FF0,
        0x00084438,
        0x35081000,
        0x314B0003,   /* andi    t3, t2, 0x3      #local cpuid                */
        0x000B5A00,   /* sll     t3, 8                                        */
        0x010B4025,   /* or      t0, t0, t3                                   */
        0x314C000C,   /* andi    t4, t2, 0xc      #node id                    */
        0x000C62BC,   /* dsll    t4, 42                                       */
        0x010C4025,   /* or      t0, t0, t4                                   */
                      /* WaitForInit:                                         */
        0xDD020020,   /* ld      v0, FN_OFF(t0)   #FN_OFF 0x020               */
        0x1040FFFE,   /* beqz    v0, WaitForInit                              */
        0x00000000,   /* nop                                                  */
        0xDD1D0028,   /* ld      sp, SP_OFF(t0)   #FN_OFF 0x028               */
        0xDD1C0030,   /* ld      gp, GP_OFF(t0)   #FN_OFF 0x030               */
        0xDD050038,   /* ld      a1, A1_OFF(t0)   #FN_OFF 0x038               */
        0x00400008,   /* jr      v0               #byebye                     */
        0x00000000,   /* nop                                                  */
        0x1000FFFF,   /* 1:  b   1b                                           */
        0x00000000,   /* nop                                                  */

                      /* Reset                                                */
        0x3C0C9000,   /* dli     t0, 0x9000000010080010                       */
        0x358C0000,
        0x000C6438,
        0x358C1008,
        0x000C6438,
        0x358C0010,
        0x240D0000,   /* li      t1, 0x00                                     */
        0xA18D0000,   /* sb      t1, (t0)                                     */
        0x1000FFFF,   /* 1:  b   1b                                           */
        0x00000000,   /* nop                                                  */

                      /* Shutdown                                             */
        0x3C0C9000,   /* dli     t0, 0x9000000010080010                       */
        0x358C0000,
        0x000C6438,
        0x358C1008,
        0x000C6438,
        0x358C0010,
        0x240D00FF,   /* li      t1, 0xff                                     */
        0xA18D0000,   /* sb      t1, (t0)                                     */
        0x1000FFFF,   /* 1:  b   1b                                           */
        0x00000000    /* nop                                                  */
    };

    rom_add_blob_fixed("boot_rom", boot_code, sizeof(boot_code),
                       loader_rommap[LOADER_BOOTROM].base);
}

static void fw_cfg_boot_set(void *opaque, const char *boot_device,
                            Error **errp)
{
    fw_cfg_modify_i16(opaque, FW_CFG_BOOT_DEVICE, boot_device[0]);
}

static void fw_conf_init(unsigned long ram_size)
{
    FWCfgState *fw_cfg;
    hwaddr cfg_addr = virt_memmap[VIRT_FW_CFG].base;

    fw_cfg = fw_cfg_init_mem_wide(cfg_addr, cfg_addr + 8, 8, 0, NULL);
    fw_cfg_add_i16(fw_cfg, FW_CFG_NB_CPUS, (uint16_t)current_machine->smp.cpus);
    fw_cfg_add_i16(fw_cfg, FW_CFG_MAX_CPUS, (uint16_t)current_machine->smp.max_cpus);
    fw_cfg_add_i64(fw_cfg, FW_CFG_RAM_SIZE, (uint64_t)ram_size);
    fw_cfg_add_i32(fw_cfg, FW_CFG_MACHINE_VERSION, 1);
    fw_cfg_add_i64(fw_cfg, FW_CFG_CPU_FREQ, get_cpu_freq_hz());
    qemu_register_boot_set(fw_cfg_boot_set, fw_cfg);
}

static int set_prom_cmdline(ram_addr_t initrd_offset, long initrd_size)
{
    int ret = 0;
    void *cmdline_buf;
    hwaddr cmdline_vaddr;
    unsigned int *parg_env;

    /* Allocate cmdline_buf for command line. */
    cmdline_buf = g_malloc0(loader_memmap[LOADER_CMDLINE].size);
    cmdline_vaddr = cpu_mips_phys_to_kseg0(NULL,
                                           loader_memmap[LOADER_CMDLINE].base);

    /*
     * Layout of cmdline_buf looks like this:
     * argv[0], argv[1], 0, env[0], env[1], ... env[i], 0,
     * argv[0]'s data, argv[1]'s data, env[0]'data, ..., env[i]'s data, 0
     */
    parg_env = (void *)cmdline_buf;

    ret = (3 + 1) * 4;
    *parg_env++ = cmdline_vaddr + ret;
    ret += (1 + snprintf(cmdline_buf + ret, 256 - ret, "g"));

    /* argv1 */
    *parg_env++ = cmdline_vaddr + ret;
    if (initrd_size > 0)
        ret += (1 + snprintf(cmdline_buf + ret, 256 - ret,
                "rd_start=0x" TARGET_FMT_lx " rd_size=%li %s",
                cpu_mips_phys_to_kseg0(NULL, initrd_offset),
                initrd_size, loaderparams.kernel_cmdline));
    else
        ret += (1 + snprintf(cmdline_buf + ret, 256 - ret, "%s",
                loaderparams.kernel_cmdline));

    /* argv2 */
    *parg_env++ = cmdline_vaddr + 4 * ret;

    rom_add_blob_fixed("cmdline", cmdline_buf,
                       loader_memmap[LOADER_CMDLINE].size,
                       loader_memmap[LOADER_CMDLINE].base);

    g_free(cmdline_buf);

    loaderparams.a0 = 2;
    loaderparams.a1 = cmdline_vaddr;

    return 0;
}

static uint64_t load_kernel(CPUMIPSState *env)
{
    long kernel_size;
    ram_addr_t initrd_offset;
    uint64_t kernel_entry, kernel_low, kernel_high, initrd_size;

    kernel_size = load_elf(loaderparams.kernel_filename, NULL,
                           cpu_mips_kseg0_to_phys, NULL,
                           (uint64_t *)&kernel_entry,
                           (uint64_t *)&kernel_low, (uint64_t *)&kernel_high,
                           NULL, 0, EM_MIPS, 1, 0);
    if (kernel_size < 0) {
        error_report("could not load kernel '%s': %s",
                     loaderparams.kernel_filename,
                     load_elf_strerror(kernel_size));
        exit(1);
    }

    /* load initrd */
    initrd_size = 0;
    initrd_offset = 0;
    if (loaderparams.initrd_filename) {
        initrd_size = get_image_size(loaderparams.initrd_filename);
        if (initrd_size > 0) {
            initrd_offset = MAX(loader_memmap[LOADER_INITRD].base,
                                ROUND_UP(kernel_high, INITRD_PAGE_SIZE));

            if (initrd_offset + initrd_size > loaderparams.ram_size) {
                error_report("memory too small for initial ram disk '%s'",
                             loaderparams.initrd_filename);
                exit(1);
            }

            initrd_size = load_image_targphys(loaderparams.initrd_filename,
                                              initrd_offset,
                                              loaderparams.ram_size - initrd_offset);
        }

        if (initrd_size == (target_ulong) -1) {
            error_report("could not load initial ram disk '%s'",
                         loaderparams.initrd_filename);
            exit(1);
        }
    }

    /* Setup prom cmdline. */
    set_prom_cmdline(initrd_offset, initrd_size);

    return kernel_entry;
}

static void main_cpu_reset(void *opaque)
{
    MIPSCPU *cpu = opaque;
    CPUMIPSState *env = &cpu->env;

    cpu_reset(CPU(cpu));

    /* Loongson-3 reset stuff */
    if (loaderparams.kernel_filename) {
        if (cpu == MIPS_CPU(first_cpu)) {
            env->active_tc.gpr[4] = loaderparams.a0;
            env->active_tc.gpr[5] = loaderparams.a1;
            env->active_tc.gpr[6] = loaderparams.a2;
            env->active_tc.PC = loaderparams.kernel_entry;
        }
        env->CP0_Status &= ~((1 << CP0St_BEV) | (1 << CP0St_ERL));
    }
}

static inline void loongson3_virt_devices_init(MachineState *machine,
                                               DeviceState *pic)
{
    int i;
    qemu_irq irq;
    PCIBus *pci_bus;
    DeviceState *dev;
    MemoryRegion *mmio_reg, *ecam_reg;
    MachineClass *mc = MACHINE_GET_CLASS(machine);
    LoongsonMachineState *s = LOONGSON_MACHINE(machine);

    dev = qdev_new(TYPE_GPEX_HOST);
    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
    pci_bus = PCI_HOST_BRIDGE(dev)->bus;

    s->ecam_alias = g_new0(MemoryRegion, 1);
    ecam_reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0);
    memory_region_init_alias(s->ecam_alias, OBJECT(dev), "pcie-ecam",
                             ecam_reg, 0, virt_memmap[VIRT_PCIE_ECAM].size);
    memory_region_add_subregion(get_system_memory(),
                                virt_memmap[VIRT_PCIE_ECAM].base,
                                s->ecam_alias);

    s->mmio_alias = g_new0(MemoryRegion, 1);
    mmio_reg = sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 1);
    memory_region_init_alias(s->mmio_alias, OBJECT(dev), "pcie-mmio",
                             mmio_reg, virt_memmap[VIRT_PCIE_MMIO].base,
                             virt_memmap[VIRT_PCIE_MMIO].size);
    memory_region_add_subregion(get_system_memory(),
                                virt_memmap[VIRT_PCIE_MMIO].base,
                                s->mmio_alias);

    s->pio_alias = g_new0(MemoryRegion, 1);
    memory_region_init_alias(s->pio_alias, OBJECT(dev), "pcie-pio",
                             get_system_io(), 0,
                             virt_memmap[VIRT_PCIE_PIO].size);
    memory_region_add_subregion(get_system_memory(),
                                virt_memmap[VIRT_PCIE_PIO].base, s->pio_alias);
    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 2, virt_memmap[VIRT_PCIE_PIO].base);

    for (i = 0; i < GPEX_NUM_IRQS; i++) {
        irq = qdev_get_gpio_in(pic, PCIE_IRQ_BASE + i);
        sysbus_connect_irq(SYS_BUS_DEVICE(dev), i, irq);
        gpex_set_irq_num(GPEX_HOST(dev), i, PCIE_IRQ_BASE + i);
    }
    msi_nonbroken = true;

    pci_vga_init(pci_bus);

    if (defaults_enabled() && object_class_by_name("pci-ohci")) {
        pci_create_simple(pci_bus, -1, "pci-ohci");
        usb_create_simple(usb_bus_find(-1), "usb-kbd");
        usb_create_simple(usb_bus_find(-1), "usb-tablet");
    }

    for (i = 0; i < nb_nics; i++) {
        pci_nic_init_nofail(&nd_table[i], pci_bus, mc->default_nic, NULL);
    }
}

static void mips_loongson3_virt_init(MachineState *machine)
{
    int i;
    long bios_size;
    MIPSCPU *cpu;
    Clock *cpuclk;
    CPUMIPSState *env;
    DeviceState *liointc;
    char *filename;
    const char *kernel_cmdline = machine->kernel_cmdline;
    const char *kernel_filename = machine->kernel_filename;
    const char *initrd_filename = machine->initrd_filename;
    ram_addr_t ram_size = machine->ram_size;
    MemoryRegion *address_space_mem = get_system_memory();
    MemoryRegion *ram = g_new(MemoryRegion, 1);
    MemoryRegion *bios = g_new(MemoryRegion, 1);
    MemoryRegion *iomem = g_new(MemoryRegion, 1);

    /* TODO: TCG will support all CPU types */
    if (!kvm_enabled()) {
        if (!machine->cpu_type) {
            machine->cpu_type = MIPS_CPU_TYPE_NAME("Loongson-3A1000");
        }
        if (!cpu_type_supports_isa(machine->cpu_type, INSN_LOONGSON3A)) {
            error_report("Loongson-3/TCG needs a Loongson-3 series cpu");
            exit(1);
        }
    } else {
        if (!machine->cpu_type) {
            machine->cpu_type = MIPS_CPU_TYPE_NAME("Loongson-3A4000");
        }
        if (!strstr(machine->cpu_type, "Loongson-3A4000")) {
            error_report("Loongson-3/KVM needs cpu type Loongson-3A4000");
            exit(1);
        }
    }

    if (ram_size < 512 * MiB) {
        error_report("Loongson-3 machine needs at least 512MB memory");
        exit(1);
    }

    /*
     * The whole MMIO range among configure registers doesn't generate
     * exception when accessing invalid memory. Create some unimplememted
     * devices to emulate this feature.
     */
    create_unimplemented_device("mmio fallback 0", 0x10000000, 256 * MiB);
    create_unimplemented_device("mmio fallback 1", 0x30000000, 256 * MiB);

    liointc = qdev_new("loongson.liointc");
    sysbus_realize_and_unref(SYS_BUS_DEVICE(liointc), &error_fatal);

    sysbus_mmio_map(SYS_BUS_DEVICE(liointc), 0, virt_memmap[VIRT_LIOINTC].base);

    serial_mm_init(address_space_mem, virt_memmap[VIRT_UART].base, 0,
                   qdev_get_gpio_in(liointc, UART_IRQ), 115200, serial_hd(0),
                   DEVICE_NATIVE_ENDIAN);

    sysbus_create_simple("goldfish_rtc", virt_memmap[VIRT_RTC].base,
                         qdev_get_gpio_in(liointc, RTC_IRQ));

    cpuclk = clock_new(OBJECT(machine), "cpu-refclk");
    clock_set_hz(cpuclk, DEF_LOONGSON3_FREQ);

    for (i = 0; i < machine->smp.cpus; i++) {
        int ip;

        /* init CPUs */
        cpu = mips_cpu_create_with_clock(machine->cpu_type, cpuclk);

        /* Init internal devices */
        cpu_mips_irq_init_cpu(cpu);
        cpu_mips_clock_init(cpu);
        qemu_register_reset(main_cpu_reset, cpu);

        if (i >= 4) {
            continue; /* Only node-0 can be connected to LIOINTC */
        }

        for (ip = 0; ip < 4 ; ip++) {
            int pin = i * 4 + ip;
            sysbus_connect_irq(SYS_BUS_DEVICE(liointc),
                               pin, cpu->env.irq[ip + 2]);
        }
    }
    env = &MIPS_CPU(first_cpu)->env;

    /* Allocate RAM/BIOS, 0x00000000~0x10000000 is alias of 0x80000000~0x90000000 */
    memory_region_init_rom(bios, NULL, "loongson3.bios",
                           virt_memmap[VIRT_BIOS_ROM].size, &error_fatal);
    memory_region_init_alias(ram, NULL, "loongson3.lowmem",
                           machine->ram, 0, virt_memmap[VIRT_LOWMEM].size);
    memory_region_init_io(iomem, NULL, &loongson3_pm_ops,
                           NULL, "loongson3_pm", virt_memmap[VIRT_PM].size);

    memory_region_add_subregion(address_space_mem,
                      virt_memmap[VIRT_LOWMEM].base, ram);
    memory_region_add_subregion(address_space_mem,
                      virt_memmap[VIRT_BIOS_ROM].base, bios);
    memory_region_add_subregion(address_space_mem,
                      virt_memmap[VIRT_HIGHMEM].base, machine->ram);
    memory_region_add_subregion(address_space_mem,
                      virt_memmap[VIRT_PM].base, iomem);

    /*
     * We do not support flash operation, just loading bios.bin as raw BIOS.
     * Please use -L to set the BIOS path and -bios to set bios name.
     */

    if (kernel_filename) {
        loaderparams.cpu_freq = get_cpu_freq_hz();
        loaderparams.ram_size = ram_size;
        loaderparams.kernel_filename = kernel_filename;
        loaderparams.kernel_cmdline = kernel_cmdline;
        loaderparams.initrd_filename = initrd_filename;
        loaderparams.kernel_entry = load_kernel(env);

        init_boot_rom();
        init_boot_param();
    } else {
        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
                                  machine->firmware ?: LOONGSON3_BIOSNAME);
        if (filename) {
            bios_size = load_image_targphys(filename,
                                            virt_memmap[VIRT_BIOS_ROM].base,
                                            virt_memmap[VIRT_BIOS_ROM].size);
            g_free(filename);
        } else {
            bios_size = -1;
        }

        if ((bios_size < 0 || bios_size > virt_memmap[VIRT_BIOS_ROM].size) &&
            !kernel_filename && !qtest_enabled()) {
            error_report("Could not load MIPS bios '%s'", machine->firmware);
            exit(1);
        }

        fw_conf_init(ram_size);
    }

    loongson3_virt_devices_init(machine, liointc);
}

static void loongson3v_machine_class_init(ObjectClass *oc, void *data)
{
    MachineClass *mc = MACHINE_CLASS(oc);

    mc->desc = "Loongson-3 Virtualization Platform";
    mc->init = mips_loongson3_virt_init;
    mc->block_default_type = IF_IDE;
    mc->max_cpus = LOONGSON_MAX_VCPUS;
    mc->default_ram_id = "loongson3.highram";
    mc->default_ram_size = 1600 * MiB;
    mc->minimum_page_bits = 14;
    mc->default_nic = "virtio-net-pci";
}

static const TypeInfo loongson3_machine_types[] = {
    {
        .name           = TYPE_LOONGSON_MACHINE,
        .parent         = TYPE_MACHINE,
        .instance_size  = sizeof(LoongsonMachineState),
        .class_init     = loongson3v_machine_class_init,
    }
};

DEFINE_TYPES(loongson3_machine_types)