/* io.h - io_inb, io_inw, io_inl, io_outb, io_outw, io_outl */

/* Define I/O macros used in device driver code to reference device     */
/*      Control and Status Registers (CSRs).  The macros either         */
/*      generate the memory-mapped I/O references needed for newer x86  */
/*      platforms, such as the Galileo boards, or the port-mapped I/O   */
/*      calls needed for traditional x86 machines and for VM platforms, */
/*      such as Vbox and VMWare.                                        */

#ifdef  MEM_MAPPED

/* Memory-mapped input merely references an item in the device's CSRs;  */
/*      memory-mapped output assigns a value to an item                 */

#define io_inb(item)            (item)
#define io_inw(item)            (item)
#define io_inl(item)            (item)

#define io_outb(item,val)       ((item) = (val))
#define io_outw(item,val)       ((item) = (val))
#define io_outl(item,val)       ((item) = (val))

#else

/* Port-mapped input passes the address of an item in the CSRs to inb,  */
/*      inw, or inl; port-mapped output calls outb, outw, or outl with  */
/*      the address of an item (cast to in int32) and a value           */

#define io_inb(item)            inb( (int32)&(item))
#define io_inw(item)            inw( (int32)&(item))
#define io_inl(item)            inl( (int32)&(item))

#define io_outb(item,val)       outb((int32)&(item),(val))
#define io_outw(item,val)       outw((int32)&(item),(val))
#define io_outl(item,val)       outl((int32)&(item),(val))

#endif