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[0] Improve wording.

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[1] Following style for manpages, just do carriage return after a
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Sponsored by:		Sandvine Incorporated
[0] Submitted by:	emaste
[1] Submitted by:	rwatson
This commit is contained in:
Attilio Rao 2010-06-03 09:54:53 +00:00
parent 87bf3a9edb
commit a41dcb6d1c
1 changed files with 13 additions and 9 deletions
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22
share/man/man4/io.4
View file

@ -72,22 +72,25 @@ all of them.
The
.Dv IODEV_PIO
is used by all the architectures in order to request that an I/O operation
be performed. It takes a 'struct iodev_pio_req' argument
that must be previously setup.
be performed.
It takes a 'struct iodev_pio_req' argument that must be previously setup.
.Pp
The
.Fa access
member specifies the type of operation requested. It may be:
member specifies the type of operation requested.
It may be:
.Bl -tag -width IODEV_PIO_WRITE
.It Dv IODEV_PIO_READ
The operation is an "in" type. A value will be read from the specified port
The operation is an "in" type.
A value will be read from the specified port
(retrieved from the
.Fa port
member) and the result will be stored in the
.Fa val
member.
.It Dv IODEV_PIO_WRITE
The operation is a "out" type. The value will be fetched from the
The operation is a "out" type.
The value will be fetched from the
.Fa val
member and will be written out to the specified port (defined as the
.Fa port
@ -105,13 +108,14 @@ the kernel enforces that only the super-user may open this device.
.Sh LEGACY
The
.Pa /dev/io
interface used to be very i386 specific and worked differently. The initial
implementation, in fact, simply raised the
interface used to be very i386 specific and worked differently.
The initial implementation simply raised the
.Em IOPL
of the current thread when
.Xr open 2
was called on the file. This behaviour is retained in the current
implementation as legacy support for both i386 and amd64 architectures.
was called on the device.
This behaviour is retained in the current implementation as legacy
support for both i386 and amd64 architectures.
.Sh SEE ALSO
.Xr close 2 ,
.Xr i386_get_ioperm 2 ,