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Re: [Qemu-devel] [Qemu-ppc] [PATCH v3] PPC: Introduce the Virtual Time B

From: Alexander Graf
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
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

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 <address@hidden>

Thanks, applied to ppc-next.


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