inl_p man page on YellowDog

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

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

DESCRIPTION
       This family of functions is used to do low level port input and output.
       The out* functions do port output, the in* functions do port input; the
       b-suffix functions are byte-width  and  the  w-suffix  functions	 word-
       width; the _p-suffix functions pause until the I/O completes.

       They  are  primarily  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 application to receive a segmentation fault.

CONFORMING TO
       outb() and friends are hardware specific. The value argument is	passed
       first  and  the	port  argument is passed second, which is the opposite
       order from most DOS implementations.

SEE ALSO
       ioperm(2), iopl(2)

Linux				  1995-11-29			       OUTB(2)
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