From: Alexander Graf <agraf@suse.de>
To: Cyril Bur <cyril.bur@au1.ibm.com>, qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v3] PPC: Introduce the Virtual Time Base (VTB) SPR register
Date: Mon, 02 Mar 2015 14:35:45 +0100 [thread overview]
Message-ID: <54F46731.2050109@suse.de> (raw)
In-Reply-To: <1425279338-22891-1-git-send-email-cyril.bur@au1.ibm.com>
On 02.03.15 07:55, Cyril Bur wrote:
> This patch adds basic support for the VTB.
>
> PowerISA:
> The Virtual Time Base (VTB) is a 64-bit incrementing counter.
> Virtual Time Base increments at the same rate as the Time Base until its value
> becomes 0xFFFF_FFFF_FFFF_FFFF (2 64 - 1); at the next increment its value
> becomes 0x0000_0000_0000_0000. There is no interrupt or other indication when
> this occurs.
>
> The operation of the Virtual Time Base has the following additional
> properties.
> 1. Loading a GPR from the Virtual Time Base has no effect on the accuracy of
> the Virtual Time Base.
> 2. Copying the contents of a GPR to the Virtual Time Base replaces the
> contents of the Virtual Time Base with the contents of the GPR.
>
> Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Thanks, applied to ppc-next.
Alex
prev parent reply other threads:[~2015-03-02 13:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-02 6:55 [Qemu-devel] [PATCH v3] PPC: Introduce the Virtual Time Base (VTB) SPR register Cyril Bur
2015-03-02 13:35 ` Alexander Graf [this message]
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