Re: [Linux-ia64] Re: [PATCH] head.S fix for unusual load addrs

[Jack Steiner <steiner@sgi.com>]

> 
> >>>>> On Fri, 9 May 2003 15:02:47 -0500 (CDT), Jack Steiner <steiner@sgi.com> said:
> 
>   >> Would there be a downside to this on SGI's machines?
> 
>   Jack> I dont see any significant problems. It actually seems easy.
> 
> Good.
> 
>   Jack> I think we still need to use __tpa() for addresses assigned by
>   Jack> the loader.  The standard __pa() macros wont work in region 5.
> 
> That's why I don't mind: nobody can use __pa() on region 5 anyhow, so
> using something different (page table walk or __tpa()) is OK.  I was
> real uneasy with having a "magic" address range inside region 7, where
> __pa() wouldn't work.  But in region 5, no problem.
> 
> It might be good to call __tpa() something different: it's too close
> to __pa() and the difference may easily be overlooked.  For example,
> ia64_tpa() would make it obvious that we're talking about an ia64
> instruction.

Seems reasonable.....


> 
> 	--david
> 
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-- 
Thanks

Jack Steiner    (651-683-5302)   (vnet 233-5302)      steiner@sgi.com