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Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl
From: |
Scott Wood |
Subject: |
Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op |
Date: |
Thu, 30 Jun 2011 17:23:45 -0500 |
On Fri, 1 Jul 2011 00:18:22 +0200
Alexander Graf <address@hidden> wrote:
>
> On 01.07.2011, at 00:11, Scott Wood wrote:
>
> > Almost, but what if we have write permission but not read?
>
> How would you write back data from a cache line when you haven't read it
> earlier?
The CPU can read it. The program can't.
> > but what about a race with DMA from the I/O thread?
>
> That'd simply be broken, but I don't quite see how it wouldn't with real
> hardware either :).
Real hardware doesn't generate a load/store sequence that the program didn't
ask for -- where's the breakage?
-Scott
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, (continued)
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/27
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Fabien Chouteau, 2011/06/28
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/28
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Fabien Chouteau, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Alexander Graf, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Alexander Graf, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Alexander Graf, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op,
Scott Wood <=
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Alexander Graf, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Scott Wood, 2011/06/30
- Re: [Qemu-devel] [PATCH] Add e500 instructions dcblc, dcbtls and dcbtstl as no-op, Alexander Graf, 2011/06/30