Function copy_kernel

tinyemu/x86_machine.c:2343–2523

#define KERNEL_PARAMS_ADDR 0x00090000

static void copy_kernel(PCMachine *s, const uint8_t *buf, int buf_len,
                        const char *cmd_line)
{
    uint8_t *ram_ptr;
    int setup_sects, header_len, copy_len, setup_hdr_start, setup_hdr_end;
    uint32_t load_address;
    struct linux_params *params;
    FBDevice *fb_dev;
    
    if (buf_len < 1024) {
    too_small:
        fprintf(stderr, "Kernel too small\n");
        exit(1);
    }
    if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) {
        fprintf(stderr, "Invalid kernel magic\n");
        exit(1);
    }
    setup_sects = buf[0x1f1];
    if (setup_sects == 0)
        setup_sects = 4;
    header_len = (setup_sects + 1) * 512;
    if (buf_len < header_len)
        goto too_small;
    if (memcmp(buf + 0x202, "HdrS", 4) != 0) {
        fprintf(stderr, "Kernel too old\n");
        exit(1);
    }
    load_address = 0x100000; /* we don't support older protocols */

    ram_ptr = get_ram_ptr(s, load_address);
    copy_len = buf_len - header_len;
    if (copy_len > (s->ram_size - load_address)) {
        fprintf(stderr, "Not enough RAM\n");
        exit(1);
    }
    memcpy(ram_ptr, buf + header_len, copy_len);

    params = (void *)get_ram_ptr(s, KERNEL_PARAMS_ADDR);
    
    memset(params, 0, sizeof(struct linux_params));

    /* copy the setup header */
    setup_hdr_start = 0x1f1;
    setup_hdr_end = 0x202 + buf[0x201];
    memcpy((uint8_t *)params + setup_hdr_start, buf + setup_hdr_start,
           setup_hdr_end - setup_hdr_start);

    strcpy((char *)params->commandline, cmd_line);

    params->mount_root_rdonly = 0;
    params->cmd_line_ptr = KERNEL_PARAMS_ADDR +
        offsetof(struct linux_params, commandline);
    params->alt_mem_k = (s->ram_size / 1024) - 1024;
    params->loader_type = 0x01;
#if 0
    if (initrd_size > 0) {
        params->initrd_start = INITRD_LOAD_ADDR;