mac_read_clr4(E1000State *s, int index)
{
    uint32_t ret = s->mac_reg[index];

    s->mac_reg[index] = 0;
    return ret;
}
mac_read_clr4(E1000State *s, int index)
{
    uint32_t ret = s->mac_reg[index];

    s->mac_reg[index] = 0;
    return ret;
}