From: Fabien Chouteau <chouteau@adacore.com>
To: "Züpke, Alexander" <azu@sysgo.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] sparc: allow CASA with ASI 0xa from user space
Date: Mon, 7 Dec 2015 16:03:02 +0100 [thread overview]
Message-ID: <56659FA6.7050703@adacore.com> (raw)
In-Reply-To: <450274839.2417.427cb7f3-4c69-4f2a-a0fb-fb2bd9dae5c4.open-xchange@xchange.sysgo.com>
On 12/07/2015 02:07 PM, "Züpke, Alexander" wrote:
> Hi Fabien,
>
>> On December 7, 2015 at 1:56 PM Fabien Chouteau <chouteau@adacore.com> wrote:
>> On 12/07/2015 01:41 PM, "Züpke, Alexander" wrote:
>>>
>>> The check for the CASA feature on SPARC v8 is already in the existng code,
>>> just 3 lines above the second hunk in the patch:
>>>
>>
>> Yes but you add a special case that allow casa from user space, this
>> special case is only available on LEON3 so that should be taken into
>> account in the priv_insn check.
>>
>> Regards,
>>
>
> No, other v8 SPARCs do not have CASA at all, only LEON3 and 4 have CASA
> backported from v9. But when CASA is available on LEON, it's available
> in both user and supervisor mode. The only restriction for user mode
> is that one must use ASI 0xa.
>
>
You're right, and ASI 0xA is also user data in SPARKv9.
Patch looks good then :)
Thanks,
next prev parent reply other threads:[~2015-12-07 15:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-04 15:01 [Qemu-devel] [PATCH] sparc: allow CASA with ASI 0xa from user space Alex Zuepke
2015-12-07 11:35 ` Fabien Chouteau
2015-12-07 12:41 ` "Züpke, Alexander"
2015-12-07 12:56 ` Fabien Chouteau
2015-12-07 13:07 ` "Züpke, Alexander"
2015-12-07 15:03 ` Fabien Chouteau [this message]
2015-12-08 19:59 ` [Qemu-devel] [PATCH for-2.5] " Richard Henderson
2015-12-08 21:28 ` Peter Maydell
2015-12-09 23:24 ` Mark Cave-Ayland
2015-12-10 11:43 ` Peter Maydell
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