rtapi_outb, rtapi_inb - Perform hardware I/O
void
rtapi_outb(unsigned char _byte_, unsigned int _port_);
unsigned char rtapi_inb(unsigned int _port_);
port
The address of the I/O port
byte
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 non-realtime 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 rtapi_request_region. Otherwise, another real-time module or the Linux kernel might attempt to access the I/O region at the same time.
rtapi_region(3rtapi)