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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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man2/ioperm.2
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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.
For more ports, the
.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.
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