Re: [Qemu-devel] [PATCH] sparc: allow CASA with ASI 0xa from user space

[Fabien Chouteau <chouteau@adacore.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,