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ioperm.2: Note that iopl() level of 3 is needed to access ports 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2013-03-12 17:28:21 +01:00
parent c3ec5c77b1
commit 4079fe3748
1 changed files with 3 additions and 1 deletions
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@ -61,7 +61,9 @@ Before Linux 2.6.8,
only the first 0x3ff I/O ports could be specified in this manner. only the first 0x3ff I/O ports could be specified in this manner.
For more ports, the For more ports, the
.BR iopl (2) .BR iopl (2)
system call had to be used. system call had to be used (with a
.I level
argument of 3).
Since Linux 2.6.8, 65,536 I/O ports can be specified. Since Linux 2.6.8, 65,536 I/O ports can be specified.
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