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From: Wink Saville <wink@saville.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@suse.de>,
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch] x86: unify/rewrite SMP TSC sync code
Date: Sat, 25 Nov 2006 12:34:44 -0800	[thread overview]
Message-ID: <4568A8E4.4020905@saville.com> (raw)
In-Reply-To: <1164476473.3147.59.camel@laptopd505.fenrus.org>

Arjan van de Ven wrote:
>> Actually, we need to ask the CPU/System makers to provide a system wide
>> timer that is independent of the given CPU. I would expect it quite simple
> 
> they exist. They're called pmtimer and hpet.
> pmtimer is port io. hpet is memory mapped io.

Thanks for the info. I took a look at Documentation/hpet.txt and drivers/char/hpet.c
and see that hpet_mmap is implemented in the driver but nothing hpet.txt indicates
what is being mapped.

Could you point me to any other documentation? I did find the following:

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

Are you aware of any example user code that uses the mmap capability of hpet?

Thanks,

Wink

  reply	other threads:[~2006-11-25 20:34 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-11-24 17:02 [patch] x86: unify/rewrite SMP TSC sync code Ingo Molnar
2006-11-24 17:13 ` Andi Kleen
2006-11-24 20:25   ` Ingo Molnar
2006-11-24 20:37     ` Andi Kleen
2006-11-24 20:46       ` Ingo Molnar
2006-11-24 21:06         ` Andi Kleen
2006-11-24 22:48     ` Ben Greear
2006-11-25  2:56     ` Wink Saville
2006-11-25  8:30       ` Arjan van de Ven
2006-11-25 16:58         ` Wink Saville
2006-11-25 17:41           ` Arjan van de Ven
2006-11-25 20:34             ` Wink Saville [this message]
2006-11-27 19:00   ` Christoph Lameter
2006-11-29  7:13 ` Ingo Molnar
     [not found] <fa./NRPJg+JjfSQLUVwnX1GpHGIojQ@ifi.uio.no>
     [not found] ` <fa.Y0RKABHd+7qnbGQYBAGPvlJ0Qic@ifi.uio.no>
     [not found]   ` <fa.fD3WSpNqEJ4736vYzEak5Gf3xTw@ifi.uio.no>
     [not found]     ` <fa.A+gkQAO1DLThaxJxPLPl3yE1CGo@ifi.uio.no>
     [not found]       ` <fa.INurNKWdUKAEULTHyfpSW65a/Ng@ifi.uio.no>
     [not found]         ` <fa.n9vySiI9RS2MCl0DZPDzxZEPiFw@ifi.uio.no>
2006-11-26  7:20           ` Robert Hancock
2006-11-26  8:16             ` Wink Saville
2006-11-26  8:24               ` Arjan van de Ven
2006-11-26 19:48                 ` Wink Saville
2006-11-27  7:51                   ` Arjan van de Ven
2006-11-27  9:15                     ` Wink Saville
  -- strict thread matches above, loose matches on Subject: below --
2006-11-27 17:23 Robert Crocombe
2006-11-27 18:41 ` Max Krasnyansky

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