svn commit: r305607 - head/sys/arm64/arm64

[Andrew Turner]

On Thu, 8 Sep 2016 16:48:45 +0200
Ed Schouten <ed at nuxi.nl> wrote:

> Hi Andrew,
> 
> 2016-09-08 14:53 GMT+02:00 Andrew Turner <andrew at freebsd.org>:
> >   Trap msr/mrs instructions. These are privileged arm64
> > instructions and shouldn't normally be used.  
> 
> It depends on which system register is being used, right? System
> registers like TPIDR_EL0 are accessed by userspace all the time.
> 

Correct, the trap is only hit when userspace doesn't have permission to
access the register.

Andrew