133 unsigned char io_in8(unsigned short port)  in io_in8()  argument
139                          : "d"(port)  in io_in8()
145 unsigned int io_in32(unsigned short port)  in io_in32()  argument
151                          : "d"(port)  in io_in32()
157 void io_out8(unsigned short port, unsigned char value)  in io_out8()  argument
162                          : "a"(value), "d"(port)  in io_out8()
167 void io_out32(unsigned short port, unsigned int value)  in io_out32()  argument
172                          : "a"(value), "d"(port)  in io_out32()
180 #define io_insw(port, buffer, nr)                                                 \  argument
181     __asm__ __volatile__("cld;rep;insw;mfence;" ::"d"(port), "D"(buffer), "c"(nr) \
188 #define io_outsw(port, buffer, nr)                                                 \  argument
189     __asm__ __volatile__("cld;rep;outsw;mfence;" ::"d"(port), "S"(buffer), "c"(nr) \