rtapi_outb, rtapi_inb — Perform hardware I/O
void rtapi_outb ( unsigned char byte, unsigned int port )
unsigned char rtapi_inb ( unsigned int port )
The address of the I/O port
The byte to be written to the port
rtapi_outb writes a byte to a hardware I/O port.
rtapi_inb reads a byte from a hardware I/O port.
May be called from init/cleanup code and from within realtime tasks. Not available in userspace components.
rtapi_inb returns the byte read from the given I/O port
The I/O address should be within a region previously allocated by
Otherwise, another real-time module or the Linux kernel might attempt to access the I/O region at the same time.