void cpu_physical_memory_unmap(void *buffer, hwaddr len,
                               bool is_write, hwaddr access_len)
{
    return address_space_unmap(&address_space_memory, buffer, len, is_write, access_len);
}
void cpu_physical_memory_unmap(void *buffer, hwaddr len,
                               bool is_write, hwaddr access_len)
{
    return address_space_unmap(&address_space_memory, buffer, len, is_write, access_len);
}