static void load_linux(void *fw_cfg,
                       const char *kernel_filename,
		       const char *initrd_filename,
		       const char *kernel_cmdline,
                       target_phys_addr_t max_ram_size)
{
    uint16_t protocol;
    int setup_size, kernel_size, initrd_size = 0, cmdline_size;
    uint32_t initrd_max;
    uint8_t header[8192], *setup, *kernel, *initrd_data;
    target_phys_addr_t real_addr, prot_addr, cmdline_addr, initrd_addr = 0;
    FILE *f;
    char *vmode;
    /* Align to 16 bytes as a paranoia measure */
    cmdline_size = (strlen(kernel_cmdline)+16) & ~15;
    /* load the kernel header */
    f = fopen(kernel_filename, "rb");
    if (!f || !(kernel_size = get_file_size(f)) ||
	fread(header, 1, MIN(ARRAY_SIZE(header), kernel_size), f) !=
	MIN(ARRAY_SIZE(header), kernel_size)) {
	fprintf(stderr, "qemu: could not load kernel '%s': %s\n",
		kernel_filename, strerror(errno));
    /* kernel protocol version */
#if 0
    fprintf(stderr, "header magic: %#x\n", ldl_p(header+0x202));
#endif
    if (ldl_p(header+0x202) == 0x53726448)
	protocol = lduw_p(header+0x206);
    else {
	/* This looks like a multiboot kernel. If it is, let's stop
	   treating it like a Linux kernel. */
        if (load_multiboot(fw_cfg, f, kernel_filename, initrd_filename,
                           kernel_cmdline, kernel_size, header))
            return;
	protocol = 0;
    if (protocol < 0x200 || !(header[0x211] & 0x01)) {
	/* Low kernel */
	real_addr    = 0x90000;
	cmdline_addr = 0x9a000 - cmdline_size;
	prot_addr    = 0x10000;
    } else if (protocol < 0x202) {
	/* High but ancient kernel */
	real_addr    = 0x90000;
	cmdline_addr = 0x9a000 - cmdline_size;
	prot_addr    = 0x100000;
    } else {
	/* High and recent kernel */
	real_addr    = 0x10000;
	cmdline_addr = 0x20000;
	prot_addr    = 0x100000;
#if 0
    fprintf(stderr,
	    "qemu: real_addr     = 0x" TARGET_FMT_plx "\n"
	    "qemu: cmdline_addr  = 0x" TARGET_FMT_plx "\n"
	    "qemu: prot_addr     = 0x" TARGET_FMT_plx "\n",
	    real_addr,
	    cmdline_addr,
	    prot_addr);
#endif
    /* highest address for loading the initrd */
    if (protocol >= 0x203)
	initrd_max = ldl_p(header+0x22c);
    else
	initrd_max = 0x37ffffff;
    if (initrd_max >= max_ram_size-ACPI_DATA_SIZE)
    	initrd_max = max_ram_size-ACPI_DATA_SIZE-1;
    fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_ADDR, cmdline_addr);
    fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE, strlen(kernel_cmdline)+1);
    fw_cfg_add_bytes(fw_cfg, FW_CFG_CMDLINE_DATA,
                     (uint8_t*)strdup(kernel_cmdline),
                     strlen(kernel_cmdline)+1);
    if (protocol >= 0x202) {
	stl_p(header+0x228, cmdline_addr);
    } else {
	stw_p(header+0x20, 0xA33F);
	stw_p(header+0x22, cmdline_addr-real_addr);
    /* handle vga= parameter */
    vmode = strstr(kernel_cmdline, "vga=");
    if (vmode) {
        unsigned int video_mode;
        /* skip "vga=" */
        vmode += 4;
        if (!strncmp(vmode, "normal", 6)) {
            video_mode = 0xffff;
        } else if (!strncmp(vmode, "ext", 3)) {
            video_mode = 0xfffe;
        } else if (!strncmp(vmode, "ask", 3)) {
            video_mode = 0xfffd;
        } else {
            video_mode = strtol(vmode, NULL, 0);
        stw_p(header+0x1fa, video_mode);
    /* loader type */
    /* High nybble = B reserved for Qemu; low nybble is revision number.
       If this code is substantially changed, you may want to consider
       incrementing the revision. */
    if (protocol >= 0x200)
	header[0x210] = 0xB0;
    /* heap */
    if (protocol >= 0x201) {
	header[0x211] |= 0x80;	/* CAN_USE_HEAP */
	stw_p(header+0x224, cmdline_addr-real_addr-0x200);
    /* load initrd */
    if (initrd_filename) {
	if (protocol < 0x200) {
	    fprintf(stderr, "qemu: linux kernel too old to load a ram disk\n");
	initrd_size = get_image_size(initrd_filename);
        initrd_addr = (initrd_max-initrd_size) & ~4095;
        initrd_data = qemu_malloc(initrd_size);
        load_image(initrd_filename, initrd_data);
        fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, initrd_addr);
        fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, initrd_size);
        fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, initrd_data, initrd_size);
	stl_p(header+0x218, initrd_addr);
	stl_p(header+0x21c, initrd_size);
    /* load kernel and setup */
    setup_size = header[0x1f1];
    if (setup_size == 0)
	setup_size = 4;
    setup_size = (setup_size+1)*512;
    kernel_size -= setup_size;
    setup  = qemu_malloc(setup_size);
    kernel = qemu_malloc(kernel_size);
    fseek(f, 0, SEEK_SET);
    if (fread(setup, 1, setup_size, f) != setup_size) {
        fprintf(stderr, "fread() failed\n");
    if (fread(kernel, 1, kernel_size, f) != kernel_size) {
        fprintf(stderr, "fread() failed\n");
    fclose(f);
    memcpy(setup, header, MIN(sizeof(header), setup_size));
    fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, prot_addr);
    fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, kernel_size);
    fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, kernel, kernel_size);
    fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_ADDR, real_addr);
    fw_cfg_add_i32(fw_cfg, FW_CFG_SETUP_SIZE, setup_size);
    fw_cfg_add_bytes(fw_cfg, FW_CFG_SETUP_DATA, setup, setup_size);
    option_rom[nb_option_roms] = "linuxboot.bin";
    nb_option_roms++;