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From: Al Stone <ahs3 at redhat.com>
Subject: Re: [Devel] ACPI 5.0 implementation for armv7 and armv8 architecture
Date: Mon, 17 Dec 2012 16:30:19 -0700
Message-ID: <50CFAB0B.4000305@redhat.com>
In-Reply-To: D9DB7F56087E294C83142799ED69E2A0773154C4@G4W3293.americas.hpqcorp.net
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To: devel@acpica.org

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I've only lurked on this list in the past, but this work sounds very
similar to work I've been tasked to take on for Linaro (please see
https://wiki.linaro.org/LEG for the context).  I'll be looking at
Cortex A9/A15 and ARMv8 for the same reasons so I'm thinking perhaps
we should coordinate our efforts here...

On 12/02/2012 08:37 PM, Wei, Dong (=E9=AD=8F=E4=B8=9C UEFI-ACPI) wrote:
> Copying Andrew Sloss from ARM.
>
> -DW
>
> *From:*devel-bounces(a)acpica.org [mailto:devel-bounces(a)acpica.org] *On
> Behalf Of *Ayan Halder
> *Sent:* Sunday, December 02, 2012 5:30 AM
> *To:* devel(a)acpica.org
> *Subject:* [Devel] ACPI 5.0 implementation for armv7 and armv8 architectu=
re
>
> Hi,
>
> I am planning to implement ACPI5.0 on an SOC having Cortex A5 and Atlas
> cpu( based on armv8 architecture) running linux on top of them.
>
> As per the ACPI 5.0 hardware specification(Fixed Hardware/ Generic
> Hardware  model) of ACPI5.0, the processor needs to support various low
> power modes(C0, C1, C2, C3) and sleep states(S1, S2, S3, S4, S5) via
> register interfaces as well as OEM provided AML(ACPI Machine Language).
>
> Therefore, which instructions in armv7 and armv8 put the processor into
> the afore-mentioned low power modes and sleep states?
>
> ( The arm instruction manual specifies =E2=80=9Cwfe=E2=80=9D and =E2=80=
=9Cwfi=E2=80=9D to put the
> processor in a sleep state, but I am not sure if this confirms to the
> ACPI 5.0 requirements )
>
> Besides, does arm provide any AML(ACPI Machine Language) code to put the
> processor to low power modes? If not, then how do we create an ACPI
> machine language code for armv7 and armv8 architecture and do we have an
> AML interpreter for armv7 and armv8 architecture?
>
> Regards,
>
> Ayan Kumar Halder
>
>
>
> _______________________________________________
> Devel mailing list
> Devel(a)acpica.org
> http://lists.acpica.org/listinfo/devel
>


-- =

ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3(a)redhat.com
-----------------------------------

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