NAME¶

lsmsr - show MSR information for x86 CPUs

SYNOPSIS¶

lsmsr [-hv] [-a [-c cpu_nr] [-f family] [-l] [-r name|address] [-V verbosity] [MSR]

DESCRIPTION¶

lsmsr is a tool to display information for machine specific registers of x86 CPUs. Following CPUs are supported: AMD family 0xf and family 0x10. For Intel and other AMD CPUs just a some common MSRs is supported.

OPTIONS¶

-a, --all

Show information for all MSRs known to the tool for that CPU family.

-c cpu_nr, --cpu cpu_nr

Select CPU (by number) for which MSR information should be displayed (default: 0).

-f fam, --family fam

Specify CPU family. Normally CPU family is auto-detected. You can use this option to disable auto-detection, e.g. for debugging purposes.

-l, --list

Show definition (address, field description) of selected MSR(s).

-r name|address, --register name|address

Specify MSR (by name or address in hex) for which MSR information should be displayed.

-V num, --verbosity num

Select verbosity of output format (between 0 and 4, default: 0)

-h, --help

Print help message and exit.

-v, --version

Display version info and exit.

Examples¶

Show all MSRs beginning with 'MTRR' and force CPU family to 0x10

# lsmsr -l -f 0x10 MTRR
MTRRcap : 0x000000fe
MTRRphysBase0 : 0x00000200
MTRRphysMask0 : 0x00000201
MTRRphysBase1 : 0x00000202
MTRRphysMask1 : 0x00000203
MTRRphysBase2 : 0x00000204
MTRRphysMask2 : 0x00000205
MTRRphysBase3 : 0x00000206
MTRRphysMask3 : 0x00000207
MTRRphysBase4 : 0x00000208
MTRRphysMask4 : 0x00000209
MTRRphysBase5 : 0x0000020a
MTRRphysMask5 : 0x0000020b
MTRRphysBase6 : 0x0000020c
MTRRphysMask6 : 0x0000020d
MTRRphysBase7 : 0x0000020e
MTRRphysMask7 : 0x0000020f
MTRRfix64K_00000 : 0x00000250
MTRRfix16K_80000 : 0x00000258
MTRRfix16K_A0000 : 0x00000259
MTRRfix4K_C0000 : 0x00000268
MTRRfix4K_C8000 : 0x00000269
MTRRfix4K_D0000 : 0x0000026a
MTRRfix4K_D8000 : 0x0000026b
MTRRfix4K_E0000 : 0x0000026c
MTRRfix4K_E8000 : 0x0000026d
MTRRfix4K_F0000 : 0x0000026e
MTRRfix4K_F8000 : 0x0000026f
MTRRdefType : 0x000002ff

Show 'MTRRcap MSR in verbose one-line mode

# lsmsr -r MTRRcap -V 1
MTRRcap = 0x0000000000000508 (MtrrCapVCnt=0x8, MtrrCapFix=0x1, MtrrCapWc=0x1)

Show 'MTRRdefType' in verbose multi-line mode

# lsmsr -r MTRRdefType -V 3
MTRRdefType = 0x0000000000000c00
MtrrDefMemType=0
MtrrDefTypeFixEn=0x1
MtrrDefTypeEn=0x1

Show definition of MSR 0x200 in verbose multi-line mode (including reserved fields)

# lsmsr -r 0x200 -V 4 -l
MTRRphysBase0: 0x00000200
0-7:Type
8-11:res
12-39:PhyBase
40-63:res

List all known MSRs for family 0xf

# lsmsr -f 0xf -l -a
TSC : 0x00000010; time-stamp counter
APIC_BASE : 0x0000001b; APIC base address

...

MTRRphysBase0 : 0x00000200; base of variable MTRR (0)
MTRRphysMask0 : 0x00000201; mask of variable MTRR (0)
MTRRphysBase1 : 0x00000202; base of variable MTRR (1)
MTRRphysMask1 : 0x00000203; mask of variable MTRR (1)

...

MTRRfix4K_F0000 : 0x0000026e
MTRRfix4K_F8000 : 0x0000026f
PAT : 0x00000277; page attribute table
MTRRdefType : 0x000002ff

Author¶

lsmsr and this manual page was written by Andreas Herrmann <andreas.herrman3@amd.com>.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License version 2.

REPORTING BUGS¶

Please send bug reports to <andreas.herrmann3@amd.com>.