linux-kernel - Re: [PATCH] RTC: Add mmap method to rtc character driver

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Message-ID: <44C66C36.2010600@zytor.com>
Date:	Tue, 25 Jul 2006 12:08:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org,
	a.zummo@...ertech.it, jg@...edesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

Arjan van de Ven wrote:
> 
> well the idea that has been tossed about a few times is using a vsyscall
> function that either calls into the kernel, or directly uses the hpet
> page (which can be user mapped) to get time information that way... 
> or even would use rdtsc in a way the kernel knows is safe (eg corrected
> for the local cpu's speed and offset etc etc).
> 

x86-64 already does that, IIRC.

	-hpa

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