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Commit 4e7f9df2 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Ingo Molnar
Browse files

hpet: Drop stale URLs 



Looks like the HPET spec at intel.com got moved.
It isn't hard to find so drop the link, just mention
the revision assumed.

Suggested-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/1455145462-3877-1-git-send-email-mst@redhat.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent a82eee74

Documentation/timers/hpet.txt

+1 −3
Original line number Diff line number Diff line 
		High Precision Event Timer Driver for Linux



The High Precision Event Timer (HPET) hardware follows a specification

by Intel and Microsoft which can be found at



	http://www.intel.com/hardwaredesign/hpetspec_1.pdf

by Intel and Microsoft, revision 1.



Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision")

and up to 32 comparators.  Normally three or more comparators are provided,

arch/x86/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -778,8 +778,8 @@ config HPET_TIMER 
	  HPET is the next generation timer replacing legacy 8254s.

	  The HPET provides a stable time base on SMP

	  systems, unlike the TSC, but it is more expensive to access,

	  as it is off-chip.  You can find the HPET spec at

	  <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.

	  as it is off-chip.  The interface used is documented

	  in the HPET spec, revision 1.



	  You can safely choose Y here.  However, HPET will only be

	  activated if the platform and the BIOS support this feature.

drivers/char/hpet.c

+1 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ 
/*

 * The High Precision Event Timer driver.

 * This driver is closely modelled after the rtc.c driver.

 * http://www.intel.com/hardwaredesign/hpetspec_1.pdf

 * See HPET spec revision 1.

 */

#define	HPET_USER_FREQ	(64)

#define	HPET_DRIFT	(500)