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