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From: Michael Ellerman <mpe@ellerman.id.au>
To: Suraj Jitindar Singh <sjitindarsingh@gmail.com>,
 linuxppc-dev@lists.ozlabs.org
Cc: kvm-ppc@vger.kernel.org, benh@kernel.crashing.org, paulus@samba.org,
 agraf@suse.com, Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Subject: Re: [PATCH V3 1/2] powerpc: Define new ISA v3.00 logical PVR value
 and PCR register value
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References: <1477975263-29045-1-git-send-email-sjitindarsingh@gmail.com>
 <1477975263-29045-2-git-send-email-sjitindarsingh@gmail.com>
Date: Tue, 08 Nov 2016 19:21:21 +1100
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Suraj Jitindar Singh <sjitindarsingh@gmail.com> writes:

> ISA 3.00 adds the logical PVR value 0x0f000005, so add a definition for
> this.
>
> Define PCR_ARCH_207 to reflect ISA 2.07 compatibility mode in the processor
> compatibility register (PCR). Also define a dummy ISA 3.00 compatibility
> mode PCR_ARCH_300 to be used in the next patch to help with determining the
> PCR value.

What's "dummy" about the PCR value?

AFAICS that value is reserved in the ISA.

Are we assuming/hoping that ISA 4.0 will use 0x10 to mean ISA 3.0 ?

cheers

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Tue, 08 Nov 2016 08:21:21 +0000
Subject: Re: [PATCH V3 1/2] powerpc: Define new ISA v3.00 logical PVR value and PCR register value
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 <1477975263-29045-2-git-send-email-sjitindarsingh@gmail.com>
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To: Suraj Jitindar Singh <sjitindarsingh@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: kvm-ppc@vger.kernel.org, benh@kernel.crashing.org, paulus@samba.org, agraf@suse.com, Suraj Jitindar Singh <sjitindarsingh@gmail.com>

Suraj Jitindar Singh <sjitindarsingh@gmail.com> writes:

> ISA 3.00 adds the logical PVR value 0x0f000005, so add a definition for
> this.
>
> Define PCR_ARCH_207 to reflect ISA 2.07 compatibility mode in the processor
> compatibility register (PCR). Also define a dummy ISA 3.00 compatibility
> mode PCR_ARCH_300 to be used in the next patch to help with determining the
> PCR value.

What's "dummy" about the PCR value?

AFAICS that value is reserved in the ISA.

Are we assuming/hoping that ISA 4.0 will use 0x10 to mean ISA 3.0 ?

cheers