How to recognize a LEON CPU?

How to recognize a LEON CPU?

[Sam Ravnborg]

Who is the relevant Gaisler contact person these days for Linux stuff?
I sometimes uses Daniel, sometimes Konrad.

I can just add both of you - this is no problem.
As I plan to update the LEON integration it would be good
to have in place.

Anyway - the real question..

In head_32.S I need very early on to determine the CPU type,
so I can distingush between LEON and SUN.
This is due to LEON using a different ASI for mmuregs
as discussed in another mail.

I assume this can be determinded from PSR.
If this is correct - then what values shall I use
to determine if the relevant cpu is LEON or SUN?

	Sam

Re: How to recognize a LEON CPU?

[David Miller]

From: Sam Ravnborg <sam@ravnborg.org>
Date: Mon, 21 May 2012 18:22:53 +0200

> I assume this can be determinded from PSR.

From arch/sparc/kernel/cpu.c:

psr IMPL 0xf with psr VERS of 3

Re: How to recognize a LEON CPU?

[Konrad Eisele]

Sam Ravnborg wrote:
> Who is the relevant Gaisler contact person these days for Linux stuff?
> I sometimes uses Daniel, sometimes Konrad.

The software groups leader is Daniel, I also
work on linux if there tasks to do, so both
can be mailed...
-- Konrad

>
> I can just add both of you - this is no problem.
> As I plan to update the LEON integration it would be good
> to have in place.
>
> Anyway - the real question..
>
> In head_32.S I need very early on to determine the CPU type,
> so I can distingush between LEON and SUN.
> This is due to LEON using a different ASI for mmuregs
> as discussed in another mail.
>
> I assume this can be determinded from PSR.
> If this is correct - then what values shall I use
> to determine if the relevant cpu is LEON or SUN?
>
> 	Sam
> --
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>

Re: How to recognize a LEON CPU?

[Daniel Hellstrom]

On 05/21/2012 06:22 PM, Sam Ravnborg wrote:
> Who is the relevant Gaisler contact person these days for Linux stuff?
> I sometimes uses Daniel, sometimes Konrad.
Please CC both of us. Kristoffer Glembo is no longer active though.

> I can just add both of you - this is no problem.
> As I plan to update the LEON integration it would be good
> to have in place.
>
> Anyway - the real question..
>
> In head_32.S I need very early on to determine the CPU type,
> so I can distingush between LEON and SUN.
> This is due to LEON using a different ASI for mmuregs
> as discussed in another mail.
>
> I assume this can be determinded from PSR.
> If this is correct - then what values shall I use
> to determine if the relevant cpu is LEON or SUN?
The LEON is SPARC compliant and has a registered number, from the manual (http://gaisler.com/products/grlib/grip.pdf section LEON3 and LEON4):

65.2.3 SPARC Implementor's ID
Gaisler Research is assigned number 15 (0xF) as SPARC implementor's identification. This value is
hard-coded into bits 31:28 in the %psr register. The version number for LEON3 is 3, which is hard-
coded in to bits 27:24 of the %psr.


Note that LEON3 and LEON4 have the same version number, they are software compatible.

Daniel

Re: How to recognize a LEON CPU?

[Daniel Hellstrom]

On 05/21/2012 11:12 PM, David Miller wrote:
> From: Sam Ravnborg<sam@ravnborg.org>
> Date: Mon, 21 May 2012 18:22:53 +0200
>
>> I assume this can be determinded from PSR.
> > From arch/sparc/kernel/cpu.c:
>
> psr IMPL 0xf with psr VERS of 3
Correct. As I written Sam:

The LEON is SPARC compliant and has a registered number, from the manual (http://gaisler.com/products/grlib/grip.pdf section LEON3 and LEON4):

65.2.3 SPARC Implementor's ID
Gaisler Research is assigned number 15 (0xF) as SPARC implementor's identification. This value is
hard-coded into bits 31:28 in the %psr register. The version number for LEON3 is 3, which is hard-
coded in to bits 27:24 of the %psr.


Note that LEON3 and LEON4 have the same version number, they are software compatible.

Daniel