// 核心模組載入函式int __init kmalloc_map_init(void)
{
    ../申請裝置號，新增cedv結構體
  buffer = kmalloc(BUF_SIZE, GFP_KERNEL); //申請bufferfor(page = virt_to_page(buffer); page< virt_to_page(buffer+BUF_SIZE); page++)
  {
     mem_map_reserve(page);  //置業為保留
  }
}
//mmap()函式staticint kmalloc_map_mmap(struct file *filp, struct
 
 vm_area_struct *vma)
{
    unsignedlong page, pos;
    unsignedlong start = (unsignedlong)vma->start;
    unsignedlong size = (unsignedlong)(vma->end - vma->start);
    printk(KERN_INFO, "mmaptest_mmap called\n");
    if(size > BUF_SIZE)  //使用者要對映的區域太大return - EINVAL;
    pos = (unsignedlong
 
)buffer;
    while(size > 0)   //對映buffer中的所有頁
    {
        page = virt_to_phys((void *)pos);
        if(remap_page_range(start, page, PAGE_SIZE, PAGE_SHARRED))
            return -EAGAIN;
        start += PAGE_SIZE;
        pos +=PAGE_SIZE;
        size -= PAGE_SIZE;
    }
    return 0;
}