2011-04-15 19:01:29 +00:00
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.TH IO 1
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.SH NAME
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io \- access PC I/O registers
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.SH SYNOPSIS
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.B io
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[
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2014-11-09 23:35:07 +00:00
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.B -WLMErw
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2011-04-15 19:01:29 +00:00
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]
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.I address
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[
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.I value
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]
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.SH DESCRIPTION
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.I io
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accesses PC I/O space.
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The operation to be performed is selected with
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.B -r
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or
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.B -w
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for reading or writing, respectively.
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The default operation size is a byte.
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C style notation for integers (e.g.
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.B 0x42
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or
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.BR 023 )
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is accepted for the
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.I address
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and
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.I value
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parameters.
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.PP
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.TP
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.B -W
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Perform a word (16 bit) operation.
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.TP
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.B -L
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Perform a long / double word (32 bit) operation.
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.TP
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.B -M
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Access a 64 bit wide machine specific register (MSR).
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2014-11-09 23:35:07 +00:00
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.TP
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.B -E
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Access embedded controller space.
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2011-04-15 19:01:29 +00:00
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.SH SOURCE
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.B /sys/src/cmd/io.c
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.SH SEE ALSO
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2014-11-09 23:35:07 +00:00
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.IR seg (1),
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.IR arch (3)
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2015-02-20 19:28:56 +00:00
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.SH HISTORY
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.I Io
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first appeared in 9front (April, 2011).
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