C++ drive_get函数代码示例

static void collie_init(QEMUMachineInitArgs *args)
{
    const char *cpu_model = args->cpu_model;
    const char *kernel_filename = args->kernel_filename;
    const char *kernel_cmdline = args->kernel_cmdline;
    const char *initrd_filename = args->initrd_filename;
    StrongARMState *s;
    DriveInfo *dinfo;
    MemoryRegion *sysmem = get_system_memory();

    if (!cpu_model) {
        cpu_model = "sa1110";
    }

    s = sa1110_init(sysmem, collie_binfo.ram_size, cpu_model);

    dinfo = drive_get(IF_PFLASH, 0, 0);
    pflash_cfi01_register(SA_CS0, NULL, "collie.fl1", 0x02000000,
                          dinfo ? dinfo->bdrv : NULL, (64 * 1024),
                          512, 4, 0x00, 0x00, 0x00, 0x00, 0);

    dinfo = drive_get(IF_PFLASH, 0, 1);
    pflash_cfi01_register(SA_CS1, NULL, "collie.fl2", 0x02000000,
                          dinfo ? dinfo->bdrv : NULL, (64 * 1024),
                          512, 4, 0x00, 0x00, 0x00, 0x00, 0);

    sysbus_create_simple("scoop", 0x40800000, NULL);

    collie_binfo.kernel_filename = kernel_filename;
    collie_binfo.kernel_cmdline = kernel_cmdline;
    collie_binfo.initrd_filename = initrd_filename;
    collie_binfo.board_id = 0x208;
    arm_load_kernel(s->cpu, &collie_binfo);
}

static void beagle_common_init(ram_addr_t ram_size,
                        const char *boot_device,
                        const char *kernel_filename,
                        const char *kernel_cmdline,
                        const char *initrd_filename,
                        int cpu_model)
{
    struct beagle_s *s = (struct beagle_s *) qemu_mallocz(sizeof(*s));
    DriveInfo *dmtd = drive_get(IF_MTD, 0, 0);
    DriveInfo *dsd  = drive_get(IF_SD, 0, 0);

    if (!dmtd && !dsd) {
        hw_error("%s: SD or NAND image required", __FUNCTION__);
    }
#if MAX_SERIAL_PORTS < 1
#error MAX_SERIAL_PORTS must be at least 1!
#endif
    s->cpu = omap3_mpu_init(cpu_model, 1, ram_size,
                            NULL, NULL, serial_hds[0], NULL);

    s->nand = nand_init(NAND_MFR_MICRON, 0xba, dmtd ? dmtd->bdrv : NULL);
    nand_setpins(s->nand, 0, 0, 0, 1, 0); /* no write-protect */
    omap_gpmc_attach(s->cpu->gpmc, BEAGLE_NAND_CS, s->nand, 0, 2);

    if (dsd) {
        omap3_mmc_attach(s->cpu->omap3_mmc[0], dsd->bdrv, 0, 0);
    }

    s->twl4030 = twl4030_init(omap_i2c_bus(s->cpu->i2c, 0),
                              s->cpu->irq[0][OMAP_INT_3XXX_SYS_NIRQ],
                              NULL, NULL);
    int i;
    for (i = 0; i < nb_nics; i++) {
        if (!nd_table[i].model || !strcmp(nd_table[i].model, "smc91c111")) {
            break;
        }
    }
    if (cpu_model == omap3430) {
        qemu_set_irq(qdev_get_gpio_in(s->cpu->gpio, BEAGLE_GPIO_ID1),1);
        qemu_set_irq(qdev_get_gpio_in(s->cpu->gpio, BEAGLE_GPIO_ID3),1);
    }
    if (i < nb_nics) {
        s->smc = qdev_create(NULL, "smc91c111");
        qdev_set_nic_properties(s->smc, &nd_table[i]);
        qdev_init_nofail(s->smc);
        sysbus_connect_irq(sysbus_from_qdev(s->smc), 0,
                           qdev_get_gpio_in(s->cpu->gpio, 54));
    } else {
        hw_error("%s: no NIC for smc91c111\n", __FUNCTION__);
    }
    omap_gpmc_attach(s->cpu->gpmc, BEAGLE_SMC_CS, s->smc, 0, 0);

    /* Wire up an I2C slave which returns EDID monitor information;
     * newer Linux kernels won't turn on the display unless they
     * detect a monitor over DDC.
     */
    s->ddc = i2c_create_slave(omap_i2c_bus(s->cpu->i2c, 2), "i2c-ddc", 0x50);

    omap_lcd_panel_attach(s->cpu->dss);
}

static void collie_init(ram_addr_t ram_size,
                const char *boot_device,
                const char *kernel_filename, const char *kernel_cmdline,
                const char *initrd_filename, const char *cpu_model)
{
    StrongARMState *s;
    DriveInfo *dinfo;
    ram_addr_t phys_flash;

    if (!cpu_model) {
        cpu_model = "sa1110";
    }

    s = sa1110_init(collie_binfo.ram_size, cpu_model);

    phys_flash = qemu_ram_alloc(NULL, "collie.fl1", 0x02000000);
    dinfo = drive_get(IF_PFLASH, 0, 0);
    pflash_cfi01_register(SA_CS0, phys_flash,
                    dinfo ? dinfo->bdrv : NULL, (64 * 1024),
                    512, 4, 0x00, 0x00, 0x00, 0x00, 0);

    phys_flash = qemu_ram_alloc(NULL, "collie.fl2", 0x02000000);
    dinfo = drive_get(IF_PFLASH, 0, 1);
    pflash_cfi01_register(SA_CS1, phys_flash,
                    dinfo ? dinfo->bdrv : NULL, (64 * 1024),
                    512, 4, 0x00, 0x00, 0x00, 0x00, 0);

    sysbus_create_simple("scoop", 0x40800000, NULL);

    collie_binfo.kernel_filename = kernel_filename;
    collie_binfo.kernel_cmdline = kernel_cmdline;
    collie_binfo.initrd_filename = initrd_filename;
    collie_binfo.board_id = 0x208;
    arm_load_kernel(s->env, &collie_binfo);
}

static void overo_init(ram_addr_t ram_size,
                       const char *boot_device,
                       const char *kernel_filename,
                       const char *kernel_cmdline,
                       const char *initrd_filename,
                       const char *cpu_model)
{
    struct overo_s *s = (struct overo_s *) g_malloc0(sizeof(*s));
    DriveInfo *dmtd = drive_get(IF_MTD, 0, 0);
    DriveInfo *dsd  = drive_get(IF_SD, 0, 0);

    if (ram_size > 1024 * 1024 * 1024) {
        fprintf(stderr, "overo: maximum permitted RAM size 1024MB\n");
        exit(1);
    }

    if (!dmtd && !dsd) {
        hw_error("%s: SD or NAND image required", __FUNCTION__);
    }
    s->cpu = omap3_mpu_init(omap3430, ram_size,
                            NULL, NULL, serial_hds[0], NULL);

    s->nand = nand_init(dmtd ? dmtd->bdrv : NULL, NAND_MFR_MICRON, 0xba);
    nand_setpins(s->nand, 0, 0, 0, 1, 0); /* no write-protect */
    omap_gpmc_attach_nand(s->cpu->gpmc, OVERO_NAND_CS, s->nand);

    if (dsd) {
        omap3_mmc_attach(s->cpu->omap3_mmc[0], dsd->bdrv, 0, 0);
    }

    /* FAB revs >= 2516: 4030 interrupt is GPIO 0 (earlier ones were 112) */
    s->twl4030 = twl4030_init(omap_i2c_bus(s->cpu->i2c, 0),
                              qdev_get_gpio_in(s->cpu->gpio, 0),
                              NULL, NULL);

    /* Wire up an I2C slave which returns EDID monitor information;
     * newer Linux kernels won't turn on the display unless they
     * detect a monitor over DDC.
     */
    s->ddc = i2c_create_slave(omap_i2c_bus(s->cpu->i2c, 2), "i2c-ddc", 0x50);

    omap_lcd_panel_attach(s->cpu->dss);

    /* Strictly this should be a LAN9221 */
    if (nd_table[0].vlan) {
        /* The ethernet chip hangs off the GPMC */
        NICInfo *nd = &nd_table[0];
        qemu_check_nic_model(nd, "lan9118");
        s->eth = qdev_create(NULL, "lan9118");
        qdev_set_nic_properties(s->eth, nd);
        qdev_init_nofail(s->eth);
        omap_gpmc_attach(s->cpu->gpmc, OVERO_NET_CS,
                         sysbus_mmio_get_region(sysbus_from_qdev(s->eth), 0));
        sysbus_connect_irq(sysbus_from_qdev(s->eth), 0,
                           qdev_get_gpio_in(s->cpu->gpio, 176));
    }
}

static void mainstone_common_init(ram_addr_t ram_size,
                const char *kernel_filename,
                const char *kernel_cmdline, const char *initrd_filename,
                const char *cpu_model, enum mainstone_model_e model, int arm_id)
{
    uint32_t sector_len = 256 * 1024;
    target_phys_addr_t mainstone_flash_base[] = { MST_FLASH_0, MST_FLASH_1 };
    PXA2xxState *cpu;
    qemu_irq *mst_irq;
    DriveInfo *dinfo;
    int i;

    if (!cpu_model)
        cpu_model = "pxa270-c5";

    /* Setup CPU & memory */
    cpu = pxa270_init(mainstone_binfo.ram_size, cpu_model);
    cpu_register_physical_memory(0, MAINSTONE_ROM,
                    qemu_ram_alloc(NULL, "mainstone.rom",
                                   MAINSTONE_ROM) | IO_MEM_ROM);

    /* Setup initial (reset) machine state */
    cpu->env->regs[15] = mainstone_binfo.loader_start;

    /* There are two 32MiB flash devices on the board */
    for (i = 0; i < 2; i ++) {
        dinfo = drive_get(IF_PFLASH, 0, i);
        if (!dinfo) {
            fprintf(stderr, "Two flash images must be given with the "
                    "'pflash' parameter\n");
            exit(1);
        }

        if (!pflash_cfi01_register(mainstone_flash_base[i],
                                qemu_ram_alloc(NULL, "mainstone.flash",
                                                  MAINSTONE_FLASH),
                                dinfo->bdrv, sector_len,
                                MAINSTONE_FLASH / sector_len, 4, 0, 0, 0, 0)) {
            fprintf(stderr, "qemu: Error registering flash memory.\n");
            exit(1);
        }
    }

    mst_irq = mst_irq_init(cpu, MST_FPGA_PHYS, PXA2XX_PIC_GPIO_0);

    /* setup keypad */
    printf("map addr %p\n", &map);
    pxa27x_register_keypad(cpu->kp, map, 0xe0);

    /* MMC/SD host */
    pxa2xx_mmci_handlers(cpu->mmc, NULL, mst_irq[MMC_IRQ]);

    smc91c111_init(&nd_table[0], MST_ETH_PHYS, mst_irq[ETHERNET_IRQ]);

    mainstone_binfo.kernel_filename = kernel_filename;
    mainstone_binfo.kernel_cmdline = kernel_cmdline;
    mainstone_binfo.initrd_filename = initrd_filename;
    mainstone_binfo.board_id = arm_id;
    arm_load_kernel(cpu->env, &mainstone_binfo);
}

static void connex_init(QEMUMachineInitArgs *args)
{
    PXA2xxState *cpu;
    DriveInfo *dinfo;
    int be;
    MemoryRegion *address_space_mem = get_system_memory();

    uint32_t connex_rom = 0x01000000;
    uint32_t connex_ram = 0x04000000;

    cpu = pxa255_init(address_space_mem, connex_ram);

    dinfo = drive_get(IF_PFLASH, 0, 0);
    if (!dinfo) {
        fprintf(stderr, "A flash image must be given with the "
                "'pflash' parameter\n");
        exit(1);
    }

#ifdef TARGET_WORDS_BIGENDIAN
    be = 1;
#else
    be = 0;
#endif
    if (!pflash_cfi01_register(0x00000000, NULL, "connext.rom", connex_rom,
                               dinfo->bdrv, sector_len, connex_rom / sector_len,
                               2, 0, 0, 0, 0, be)) {
        fprintf(stderr, "qemu: Error registering flash memory.\n");
        exit(1);
    }

    /* Interrupt line of NIC is connected to GPIO line 36 */
    smc91c111_init(&nd_table[0], 0x04000300,
                    qdev_get_gpio_in(cpu->gpio, 36));
}

static int s5l8930_spi_init1(SysBusDevice *dev)
{
    int iomemtype;
    DriveInfo *dinfo;
    S5L8930SPIState *s = FROM_SYSBUS(S5L8930SPIState, dev);

    sysbus_init_irq(dev, &s->irq);

    iomemtype = cpu_register_io_memory(s5l8930_spi_readfn, s5l8930_spi_writefn, s, DEVICE_LITTLE_ENDIAN);
    sysbus_init_mmio(dev, 0x3c, iomemtype);

    if(!intnum) {
        dinfo = drive_get(IF_PFLASH, 0, 0);

        if (!dinfo) {
            fprintf(stderr, "A NOR image must be given with the -pflash parameter\n");
            exit(1);
        }

        s->timer = qemu_new_timer_ns(vm_clock, spi_timer, s);

        s->pflash = (void *)pflash_spi_register(qemu_ram_alloc(NULL, "ipad1g.xor", 1024*1024),
                                                dinfo->bdrv, 4096,
                                                256, 1, 2,
                                                0x1f, 0x45, 0x02);
        intnum++;
    }
    return 0;
}

static void beagle_common_init(ram_addr_t ram_size,
                        const char *boot_device,
                        const char *kernel_filename,
                        const char *kernel_cmdline,
                        const char *initrd_filename,
                        int cpu_model)
{
    MemoryRegion *sysmem = get_system_memory();
    struct beagle_s *s = (struct beagle_s *) g_malloc0(sizeof(*s));
    DriveInfo *dmtd = drive_get(IF_MTD, 0, 0);
    DriveInfo *dsd  = drive_get(IF_SD, 0, 0);

    if (!dmtd && !dsd) {
        hw_error("%s: SD or NAND image required", __FUNCTION__);
    }
#if MAX_SERIAL_PORTS < 1
#error MAX_SERIAL_PORTS must be at least 1!
#endif
    s->cpu = omap3_mpu_init(sysmem, cpu_model, ram_size,
                            NULL, NULL, serial_hds[0], NULL);

    s->nand = nand_init(dmtd ? dmtd->bdrv : NULL, NAND_MFR_MICRON, 0xba);
    nand_setpins(s->nand, 0, 0, 0, 1, 0); /* no write-protect */
    omap_gpmc_attach_nand(s->cpu->gpmc, BEAGLE_NAND_CS, s->nand);

    if (dsd) {
        omap3_mmc_attach(s->cpu->omap3_mmc[0], dsd->bdrv, 0, 0);
    }

    s->twl4030 = twl4030_init(omap_i2c_bus(s->cpu->i2c[0]),
                              qdev_get_gpio_in(s->cpu->ih[0],
                                               OMAP_INT_3XXX_SYS_NIRQ),
                              NULL, NULL);
    if (cpu_model == omap3430) {
        qemu_set_irq(qdev_get_gpio_in(s->cpu->gpio, BEAGLE_GPIO_ID1),1);
        qemu_set_irq(qdev_get_gpio_in(s->cpu->gpio, BEAGLE_GPIO_ID3),1);
    }

    /* Wire up an I2C slave which returns EDID monitor information;
     * newer Linux kernels won't turn on the display unless they
     * detect a monitor over DDC.
     */
    s->ddc = i2c_create_slave(omap_i2c_bus(s->cpu->i2c[2]), "i2c-ddc", 0x50);

    omap_lcd_panel_attach(s->cpu->dss);
}

void pc_basic_device_init(qemu_irq *isa_irq,
                          FDCtrl **floppy_controller,
                          ISADevice **rtc_state)
{
    int i;
    DriveInfo *fd[MAX_FD];
    PITState *pit;
    qemu_irq rtc_irq = NULL;
    qemu_irq *a20_line;
    ISADevice *i8042;
    qemu_irq *cpu_exit_irq;

    register_ioport_write(0x80, 1, 1, ioport80_write, NULL);

    register_ioport_write(0xf0, 1, 1, ioportF0_write, NULL);

    if (!no_hpet) {
        DeviceState *hpet = sysbus_create_simple("hpet", HPET_BASE, NULL);

        for (i = 0; i < 24; i++) {
            sysbus_connect_irq(sysbus_from_qdev(hpet), i, isa_irq[i]);
        }
        rtc_irq = qdev_get_gpio_in(hpet, 0);
    }
    *rtc_state = rtc_init(2000, rtc_irq);

    qemu_register_boot_set(pc_boot_set, *rtc_state);

    pit = pit_init(0x40, isa_reserve_irq(0));
    pcspk_init(pit);

    for(i = 0; i < MAX_SERIAL_PORTS; i++) {
        if (serial_hds[i]) {
            serial_isa_init(i, serial_hds[i]);
        }
    }

    for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
        if (parallel_hds[i]) {
            parallel_init(i, parallel_hds[i]);
        }
    }

    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 1);
    i8042 = isa_create_simple("i8042");
    i8042_setup_a20_line(i8042, a20_line);
    vmmouse_init(i8042);

    cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
    DMA_init(0, cpu_exit_irq);

    for(i = 0; i < MAX_FD; i++) {
        fd[i] = drive_get(IF_FLOPPY, 0, i);
    }
    *floppy_controller = fdctrl_init_isa(fd);
}

void pc_system_firmware_init(MemoryRegion *rom_memory)
{
    DriveInfo *pflash_drv;
    PcSysFwDevice *sysfw_dev;

    sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");

    qdev_init_nofail(DEVICE(sysfw_dev));

    if (sysfw_dev->rom_only) {
        old_pc_system_rom_init(rom_memory);
        return;
    }

    pflash_drv = drive_get(IF_PFLASH, 0, 0);

    /* Currently KVM cannot execute from device memory.
       Use old rom based firmware initialization for KVM. */
    if (kvm_enabled()) {
        if (pflash_drv != NULL) {
            fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
            exit(1);
        } else {
            sysfw_dev->rom_only = 1;
            old_pc_system_rom_init(rom_memory);
            return;
        }
    }

    /* If a pflash drive is not found, then create one using
       the bios filename. */
    if (pflash_drv == NULL) {
        pc_fw_add_pflash_drv();
        pflash_drv = drive_get(IF_PFLASH, 0, 0);
    }

    if (pflash_drv != NULL) {
        pc_system_flash_init(rom_memory, pflash_drv);
    } else {
        fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
        exit(1);
    }
}

static void tosa_microdrive_attach(PXA2xxState *cpu)
{
    PCMCIACardState *md;
    DriveInfo *dinfo;

    dinfo = drive_get(IF_IDE, 0, 0);
    if (!dinfo || dinfo->media_cd)
        return;
    md = dscm1xxxx_init(dinfo);
    pxa2xx_pcmcia_attach(cpu->pcmcia[0], md);
}

static void
petalogix_s3adsp1800_init(QEMUMachineInitArgs *args)
{
    ram_addr_t ram_size = args->ram_size;
    const char *cpu_model = args->cpu_model;
    DeviceState *dev;
    MicroBlazeCPU *cpu;
    CPUMBState *env;
    DriveInfo *dinfo;
    int i;
    hwaddr ddr_base = MEMORY_BASEADDR;
    MemoryRegion *phys_lmb_bram = g_new(MemoryRegion, 1);
    MemoryRegion *phys_ram = g_new(MemoryRegion, 1);
    qemu_irq irq[32], *cpu_irq;
    MemoryRegion *sysmem = get_system_memory();

    /* init CPUs */
    if (cpu_model == NULL) {
        cpu_model = "microblaze";
    }
    cpu = cpu_mb_init(cpu_model);
    env = &cpu->env;

    /* Attach emulated BRAM through the LMB.  */
    memory_region_init_ram(phys_lmb_bram,
                           "petalogix_s3adsp1800.lmb_bram", LMB_BRAM_SIZE);
    vmstate_register_ram_global(phys_lmb_bram);
    memory_region_add_subregion(sysmem, 0x00000000, phys_lmb_bram);

    memory_region_init_ram(phys_ram, "petalogix_s3adsp1800.ram", ram_size);
    vmstate_register_ram_global(phys_ram);
    memory_region_add_subregion(sysmem, ddr_base, phys_ram);

    dinfo = drive_get(IF_PFLASH, 0, 0);
    pflash_cfi01_register(FLASH_BASEADDR,
                          NULL, "petalogix_s3adsp1800.flash", FLASH_SIZE,
                          dinfo ? dinfo->bdrv : NULL, (64 * 1024),
                          FLASH_SIZE >> 16,
                          1, 0x89, 0x18, 0x0000, 0x0, 1);

    cpu_irq = microblaze_pic_init_cpu(env);
    dev = xilinx_intc_create(INTC_BASEADDR, cpu_irq[0], 2);
    for (i = 0; i < 32; i++) {
        irq[i] = qdev_get_gpio_in(dev, i);
    }

    sysbus_create_simple("xlnx.xps-uartlite", UARTLITE_BASEADDR, irq[3]);
    /* 2 timers at irq 2 @ 62 Mhz.  */
    xilinx_timer_create(TIMER_BASEADDR, irq[0], 0, 62 * 1000000);
    xilinx_ethlite_create(&nd_table[0], ETHLITE_BASEADDR, irq[1], 0, 0);

    microblaze_load_kernel(cpu, ddr_base, ram_size,
                           BINARY_DEVICE_TREE_FILE, machine_cpu_reset);
}

static void tosa_microdrive_attach(PXA2xxState *cpu)
{
    PCMCIACardState *md;
    BlockDriverState *bs;
    DriveInfo *dinfo;

    dinfo = drive_get(IF_IDE, 0, 0);
    if (!dinfo)
        return;
    bs = dinfo->bdrv;
    if (bdrv_is_inserted(bs) && !bdrv_is_removable(bs)) {
        md = dscm1xxxx_init(dinfo);
        pxa2xx_pcmcia_attach(cpu->pcmcia[0], md);
    }
}

TC6393xbState *tc6393xb_init(MemoryRegion *sysmem, uint32_t base, qemu_irq irq)
{
    TC6393xbState *s;
    DriveInfo *nand;
    static const MemoryRegionOps tc6393xb_ops = {
        .read = tc6393xb_readb,
        .write = tc6393xb_writeb,
        .endianness = DEVICE_NATIVE_ENDIAN,
        .impl = {
            .min_access_size = 1,
            .max_access_size = 1,
        },
    };

    s = (TC6393xbState *) g_malloc0(sizeof(TC6393xbState));
    s->irq = irq;
    s->gpio_in = qemu_allocate_irqs(tc6393xb_gpio_set, s, TC6393XB_GPIOS);

    s->l3v = *qemu_allocate_irqs(tc6393xb_l3v, s, 1);
    s->blanked = 1;

    s->sub_irqs = qemu_allocate_irqs(tc6393xb_sub_irq, s, TC6393XB_NR_IRQS);

    nand = drive_get(IF_MTD, 0, 0);
    s->flash = nand_init(nand ? nand->bdrv : NULL, NAND_MFR_TOSHIBA, 0x76);

    memory_region_init_io(&s->iomem, &tc6393xb_ops, s, "tc6393xb", 0x10000);
    memory_region_add_subregion(sysmem, base, &s->iomem);

    memory_region_init_ram(&s->vram, "tc6393xb.vram", 0x100000);
    vmstate_register_ram_global(&s->vram);
    s->vram_ptr = memory_region_get_ram_ptr(&s->vram);
    memory_region_add_subregion(sysmem, base + 0x100000, &s->vram);
    s->scr_width = 480;
    s->scr_height = 640;
    s->con = graphic_console_init(tc6393xb_update_display,
            NULL, /* invalidate */
            NULL, /* screen_dump */
            NULL, /* text_update */
            s);

    return s;
}

void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
{
    DriveInfo *pflash_drv;

    pflash_drv = drive_get(IF_PFLASH, 0, 0);

    if (isapc_ram_fw || pflash_drv == NULL) {
        /* When a pflash drive is not found, use rom-mode */
        old_pc_system_rom_init(rom_memory, isapc_ram_fw);
        return;
    }

    if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
        /* Older KVM cannot execute from device memory. So, flash memory
         * cannot be used unless the readonly memory kvm capability is present. */
        fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
        exit(1);
    }

    pc_system_flash_init(rom_memory, pflash_drv);
}