NAME

       rtapi_outb, rtapi_inb - Perform hardware I/O

SYNTAX

       void rtapi_outb(unsigned char byte, unsigned int port)

       unsigned char rtapi_inb(unsigned int port)

ARGUMENTS

       port   The address of the I/O port

       byte   The byte to be written to the port

DESCRIPTION

       rtapi_outb  writes  a byte to a hardware I/O port.  rtapi_inb reads a byte from a hardware
       I/O port.

REALTIME CONSIDERATIONS

       May be called from init/cleanup code and from within realtime  tasks.   Not  available  in
       userspace components.

RETURN VALUE

       rtapi_inb returns the byte read from the given I/O port

NOTES

       The  I/O  address  should be within a region previously allocated by rtapi_request_region.
       Otherwise, another real-time module or the Linux kernel might attempt to  access  the  I/O
       region at the same time.

SEE ALSO

       rtapi_region(3rtapi)