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IO(1)                       General Commands Manual                      IO(1)



NAME
       io - access PC I/O registers

SYNOPSIS
       io [ -WLMErw ] address [ value ]

DESCRIPTION
       io  accesses  PC  I/O space.  The operation to be performed is selected
       with -r or -w for reading or writing, respectively.  The default opera‐
       tion size is a byte.  C style notation for integers (e.g.  0x42 or 023)
       is accepted for the address and value parameters.

       -W     Perform a word (16 bit) operation.

       -L     Perform a long / double word (32 bit) operation.

       -M     Access a 64 bit wide machine specific register (MSR).

       -E     Access embedded controller space.

SOURCE
       /sys/src/cmd/io.c

SEE ALSO
       seg(1), arch(3)

HISTORY
       Io first appeared in 9front (April, 2011).



                                                                         IO(1)