Commit Graph

13 Commits

Author SHA1 Message Date
kib
dc8d51112c Make it possible to re-evaluate cpu_features.
Add cpuctl(4) ioctl CPUCTL_EVAL_CPU_FEATURES which forces re-read of
cpu_features, cpu_features2, cpu_stdext_features, and
std_stdext_features2.

The intent is to allow the kernel to see the changes in the CPU
features after micocode update.  Of course, the update is not atomic
across variables and not synchronized with readers.  See the man page
warning as well.

Reviewed by:	imp (previous version), jilles
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D13770
2018-01-05 21:06:19 +00:00
kib
19f4935a86 Update cpucontrol(8).
Mention new -n flag.
Remove optional -h from the operation list lines, -h would cause the
utility to exit without performing the action.
Explain the default path behavior, list default path.
Correct example of update performed from the non-default path,
it needs -n and the trailing slash is redundand.
Remove useless BUGS section.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2017-09-30 10:03:42 +00:00
kib
09cc2c482f Remove confusion in the line explaining syntax of the msr read.
Specify words order in the display.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
2017-08-14 11:19:31 +00:00
bapt
c0cd28f928 use .Mt to mark up email addresses consistently (part2)
PR:		191174
Submitted by:	Franco Fichtner  <franco@lastsummer.de>
2014-06-20 09:57:27 +00:00
attilio
e1ad5f01a6 Following comments in r242565 add the possibility to specify ecx when
performing cpuid calls.
Add also a new way to specify the level type to cpucontrol(8) as
reported in the manpage.

Sponsored by:	EMC / Isilon storage division
Reviewed by:	bdrewery, gcooper
Testerd by:	bdrewery
2014-06-19 21:54:41 +00:00
wblock
9fa9a2acad Fixes to man8 groff mandoc style, usage mistakes, or typos.
PR:		168016
Submitted by:	Nobuyuki Koganemaru
Approved by:	gjb
MFC after:	3 days
2012-05-24 02:24:03 +00:00
uqs
1ab3783e1a mdoc: move CAVEATS, BUGS and SECURITY CONSIDERATIONS sections to the
bottom of the manpages and order them consistently.

GNU groff doesn't care about the ordering, and doesn't even mention
CAVEATS and SECURITY CONSIDERATIONS as common sections and where to put
them.

Found by:	mdocml lint run
Reviewed by:	ru
2010-05-13 12:07:55 +00:00
stas
9a7ae64d55 - Add support to atomically set/clear individual bits of a MSR register
via cpuctl(4) driver.  Two new CPUCTL_MSRSBIT and CPUCTL_MSRCBIT ioctl(2)
  calls treat the data field of the argument struct passed as a mask
  and set/clear bits of the MSR register according to the mask value.
- Allow user to perform atomic bitwise AND and OR operaions on MSR registers
  via cpucontrol(8) utility.  Two new operations ("&=" and "|=") have been
  added.  The first one applies bitwise AND operaion between the current
  contents of the MSR register and the mask, and the second performs bitwise
  OR.  The argument can be optionally prefixed with "~" inversion operator.
  This allows one to mimic the "clear bit" behavior by using the command
  like this:
      cpucontrol -m 0x10&=~0x02		# clear the second bit of TSC MSR

  Inversion operator support in all modes (assignment, OR, AND).

Approved by:	re (kib)
MFC after:	1 month
2009-06-30 12:35:47 +00:00
brueffer
ecbce5102d Correct the information about when the respective functionality first
appeared in FreeBSD.

PR:		133785
Submitted by:	Ulrich Spoerlein <uqs@spoerlein.net>
MFC after:	3 days
2009-04-23 08:37:56 +00:00
danger
68470ef852 - use .Ex macro in EXIT STATUS section 2009-01-07 01:31:09 +00:00
stas
441b9aa0f3 - Improve wording.
Approved by:	kib (mentor)
MFC after:	1 week
2009-01-04 15:49:30 +00:00
brueffer
48216e44a5 Mdoc and wording improvements. 2008-12-30 20:16:33 +00:00
stas
a782fc10fe - Add cpuctl(4) pseudo-device driver to provide access to some low-level
features of CPUs like reading/writing machine-specific registers,
  retrieving cpuid data, and updating microcode.
- Add cpucontrol(8) utility, that provides userland access to
  the features of cpuctl(4).
- Add subsequent manpages.

The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX
is created for each cpu present in the systems. The pseudo-device minor
number corresponds to the cpu number in the system. The cpuctl(4) pseudo-
device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID
and UPDATE. The first pair alows the caller to read/write machine-specific
registers from the correspondent CPU. cpuid data could be retrieved using
the CPUID call, and microcode updates are applied via UPDATE.

The permissions are inforced based on the pseudo-device file permissions.
RDMSR/CPUID will be allowed when the caller has read access to the device
node, while WRMSR/UPDATE will be granted only when the node is opened
for writing. There're also a number of priv(9) checks.

The cpucontrol(8) utility is intened to provide userland access to
the cpuctl(4) device features. The utility also allows one to apply
cpu microcode updates.

Currently only Intel and AMD cpus are supported and were tested.

Approved by:	kib
Reviewed by:	rpaulo, cokane, Peter Jeremy
MFC after:	1 month
2008-08-08 16:26:53 +00:00