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Date: Sat, 29 Jun 2013 16:12:25 +0100
From: Andrew Turner <andrew@fubar.geek.nz>
To: Aleksandr Rybalko <ray@FreeBSD.org>
Subject: Re: svn commit: r252372 - head/sys/arm/arm
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 src-committers@freebsd.org, Ruslan Bukin <br@bsdpad.com>
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On Sat, 29 Jun 2013 12:27:50 +0000 (UTC)
Aleksandr Rybalko <ray@FreeBSD.org> wrote:

> Author: ray
> Date: Sat Jun 29 12:27:50 2013
> New Revision: 252372
> URL: http://svnweb.freebsd.org/changeset/base/252372
> 
> Log:
>   Add ARM Generic Timer driver.
>   
>   Submitted by:	Ruslan Bukin <br@bsdpad.com>
> 
> Added:
>   head/sys/arm/arm/generic_timer.c   (contents, props changed)
> 
> Added: head/sys/arm/arm/generic_timer.c

...
> +static inline void
> +disable_user_access(void)
> +{
> +	uint32_t cntkctl;
> +
> +	__asm volatile("mrc p15, 0, %0, c14, c1, 0" :
> "=r" (cntkctl));
> +	cntkctl &= ~((3 << 8) | (7 << 0));
What do these magic numbers do? I.e. could they be macros so the values
are described.

Andrew