From: Thomas Huth <thuth@redhat.com>
To: Alexander Graf <agraf@suse.de>, Laurent Vivier <lvivier@redhat.com>
Cc: dgibson@redhat.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] ppc64: set MSR_SF bit
Date: Wed, 16 Mar 2016 11:32:01 +0100 [thread overview]
Message-ID: <56E93621.1070304@redhat.com> (raw)
In-Reply-To: <56E93033.1040305@suse.de>
On 16.03.2016 11:06, Alexander Graf wrote:
>
>
> On 16.03.16 11:05, Laurent Vivier wrote:
>> On 16/03/2016 10:48, Alexander Graf wrote:
>>>
>>>
>>> On 16.03.16 10:43, Laurent Vivier wrote:
>>>> When a qemu-system-ppc64 is started, the 64-bit mode bit
>>>> is not set in MSR.
>>>>
>>>> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
>>>
>>> I guess commit 2cf3eb6df552cee74b52de9989e270b74e42847e broke this. I'm
>>> surprised it didn't cause us more problems :).
>>
>> Linux kernel is ready to manage that: see enable_64b_mode in
>> arch/powerpc/kernel/head_64.S
>
> We don't boot Linux directly though, only openBIOS and SLOF :).
Both, SLOF and OpenBIOS, seem to enable the SF bit manually, too, see:
https://github.com/qemu/openbios/blob/master/arch/ppc/qemu/start.S#L524
https://github.com/aik/SLOF/blob/master/board-qemu/llfw/startup.S#L91
Thomas
next prev parent reply other threads:[~2016-03-16 10:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-16 9:43 [Qemu-devel] [PATCH] ppc64: set MSR_SF bit Laurent Vivier
2016-03-16 9:48 ` Alexander Graf
2016-03-16 10:05 ` Laurent Vivier
2016-03-16 10:06 ` Alexander Graf
2016-03-16 10:30 ` Laurent Vivier
2016-03-16 10:32 ` Thomas Huth [this message]
2016-03-16 10:42 ` Alexander Graf
2016-03-21 1:28 ` [Qemu-devel] [Qemu-ppc] " David Gibson
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