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
DESCRIPTION
This family of functions is used to do low level port
input and output. They are primarily designed for inter
nal kernel use, but can be used from user space, given the
following information in addition to that given in outb(9)
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 refer
ences 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 port and value
arguments are in the opposite order to most DOS implemen
tations.
SEE ALSO
ioperm(2), iopl(2)
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