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arch(3): document msr

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cinap_lenrek 2011-08-27 07:42:13 +02:00
parent 78e19b52bf
commit c8168fd3bc
1 changed files with 6 additions and 1 deletions
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7
sys/man/3/arch
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@ -12,6 +12,7 @@ arch \- architecture-specific information and control
.B /dev/iol .B /dev/iol
.B /dev/iow .B /dev/iow
.B /dev/irqalloc .B /dev/irqalloc
.B /dev/msr
.SH DESCRIPTION .SH DESCRIPTION
This device presents textual information about PC hardware and allows This device presents textual information about PC hardware and allows
user-level control of the I/O ports on x86-class and DEC Alpha machines. user-level control of the I/O ports on x86-class and DEC Alpha machines.
@ -116,11 +117,15 @@ Reads and writes to
.IR iob , .IR iob ,
.IR iow , .IR iow ,
and and
.I iol .IR iol
cause 8-bit wide, 16-bit wide, and 32-bit wide requests to cause 8-bit wide, 16-bit wide, and 32-bit wide requests to
I/O ports. I/O ports.
The port accessed is determined by the byte offset of the The port accessed is determined by the byte offset of the
file descriptor. file descriptor.
.PP
Reads and writes to
.I msr
go to the P4/P6/Core/Core2/AMD64 MSRs.
.SH EXAMPLE .SH EXAMPLE
The following code reads from an x86 byte I/O port. The following code reads from an x86 byte I/O port.
.IP .IP