OUTB(2) Linux Programmer's Manual OUTB(2)NAME
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 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 port and value arguments are in the opposite order to most DOS implementations.
SEE ALSO ioperm(2), iopl(2)Linux 1995-11-29 OUTB(2)
Check Out this Related Man Page
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)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1995-11-29 OUTB(2)
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