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+.\" Copyright (c) 2007 Joseph Koshy.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" This software is provided by Joseph Koshy ``as is'' and
+.\" any express or implied warranties, including, but not limited to, the
+.\" implied warranties of merchantability and fitness for a particular purpose
+.\" are disclaimed.  in no event shall Joseph Koshy be liable
+.\" for any direct, indirect, incidental, special, exemplary, or consequential
+.\" damages (including, but not limited to, procurement of substitute goods
+.\" or services; loss of use, data, or profits; or business interruption)
+.\" however caused and on any theory of liability, whether in contract, strict
+.\" liability, or tort (including negligence or otherwise) arising in any way
+.\" out of the use of this software, even if advised of the possibility of
+.\" such damage.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 25, 2007
+.Os
+.Dt PMC_GET_MSR 3
+.Sh NAME
+.Nm pmc_get_msr
+.Nd x86 architecture-specific PMC operations
+.Sh LIBRARY
+.Lb libpmc
+.Sh SYNOPSIS
+.In pmc.h
+.Ft int
+.Fn pmc_get_msr "pmc_id_t pmc" "uint32_t *msr"
+.Sh DESCRIPTION
+The function
+.Fn pmc_get_msr
+returns the processor model specific register number associated with
+a PMC for subsequent use with RDPMC instructions.
+Argument
+.Fa pmc
+specifies a process scope counting PMC.
+The function will write the model specific register number associated
+with the PMC to the location pointed to by argument
+.Fa msr .
+.Pp
+After successful completion of this function, applications
+can directly read the contents of PMC hardware using
+RDPMC instructions.
+.Sh RETURN VALUES
+.Rv -std pmc_get_msr
+.Sh ERRORS
+A call to
+.Fn pmc_get_msr
+may fail with the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The PMC handle specified was invalid.
+.It Bq Er EINVAL
+The PMC specified did not have process scope or counting mode.
+.It Bq Er EINVAL
+The PMC specified was allocated with the
+.Dv PMC_F_DESCENDANTS
+flag.
+.It Bq Er EINVAL
+The specified PMC is already attached to target processes other
+than the owner.
+.It Bq Er ENOSYS
+The underlying hardware does not support an RDPMC instruction.
+.El
+.Sh SEE ALSO
+.Xr pmc 3 ,
+.Xr hwpmc 4