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RedHat 9 (Linux i386) - man page for outl_p (redhat section 2)

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OUTB(2) 			    Linux Programmer's Manual				  OUTB(2)

       outb, outw, outl, outsb, outsw, outsl - port output
       inb, inw, inl, insb, insw, insl - port input
       outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - paused I/O

       This  family of functions is used to do low level port input and output.  They are primar-
       ily designed for internal kernel use, but can be used from user space.

       You compile with -O or -O2 or similar. The functions are defined  as  inline  macros,  and
       will  not be substituted in without optimization enabled, causing unresolved references at
       link time.

       You use ioperm(2) or alternatively iopl(2) to tell the kernel  to  allow  the  user  space
       application  to access the I/O ports in question. Failure to do this will cause the appli-
       cation to receive a segmentation fault.

       outb and friends are hardware specific. The port and value arguments are in  the  opposite
       order to most DOS implementations.

       ioperm(2), iopl(2)

Linux					    1995-11-29					  OUTB(2)
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