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Re: [Qemu-devel] [PATCH 05/35] tcg-s390: Icache flush is a no-op.
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH 05/35] tcg-s390: Icache flush is a no-op. |
Date: |
Fri, 11 Jun 2010 08:46:38 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Thu, Jun 10, 2010 at 03:04:04PM -0700, Richard Henderson wrote:
> On 06/09/2010 03:55 PM, Aurelien Jarno wrote:
> > On Fri, Jun 04, 2010 at 12:14:13PM -0700, Richard Henderson wrote:
> >> Before gcc 4.2, __builtin___clear_cache doesn't exist, and
> >> afterward the gcc s390 backend implements it as nothing.
> >
> > Does it means that instruction and data caches are coherent on s390?
>
> Yes.
>
> Principles of Operation, 2.1 Main storage:
> # Main storage may include a faster-access buffer storage, sometimes called a
> cache.
> # Each CPU may have an associated cache. The effects, except on performance,
> of
> # the physical construction and the use of distinct storage media are not
> observable
> # by the program.
>
> This architecture pre-dates caches, I think. ;-)
Ok, I have applied the patch
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
[Qemu-devel] [PATCH 07/35] tcg: Optionally sign-extend 32-bit arguments for 64-bit host., Richard Henderson, 2010/06/04