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Message-Id: <1229332954.25349.78.camel@zakaz.uk.xensource.com>
Date: Mon, 15 Dec 2008 09:22:34 +0000
From: Ian Campbell <ijc@...lion.org.uk>
To: Philipp Kohlbecher <xt28@....de>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: documentation fix regarding boot protocol
On Sun, 2008-12-14 at 18:50 +0100, Philipp Kohlbecher wrote:
> Documentation/x86/boot.txt describes payload_offset as the offset
> from the end of the real-mode code. In fact, it is more accurately
> described as the offset from the beginning of the protected-mode
> code, as (a) this is how it is actually calculated and (b) the padding
> after the real-mode code is not included in the offset.
>
> Signed-off-by: Philipp Kohlbecher <xt28@....de>
Acked-by: Ian Campbell <ijc@...lion.org.uk>
The padding after the real-mode code which you mention is just the
implicit padding because the size of the real-mode code is specified in
sectors (and hence is rounded up), isn't it?
Is it worth saying that the payload_offset is relative to (setup_sectors
+1) * 512?
>
> ---
>
> Documentation/x86/boot.txt | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
> index 83c0033..414b6fb 100644
> --- a/Documentation/x86/boot.txt
> +++ b/Documentation/x86/boot.txt
> @@ -537,8 +537,8 @@ Type: read
> Offset/size: 0x248/4
> Protocol: 2.08+
>
> - If non-zero then this field contains the offset from the end of the
> - real-mode code to the payload.
> + If non-zero then this field contains the offset from the beginning
> + of the protected-mode code to the payload.
>
> The payload may be compressed. The format of both the compressed and
> uncompressed data should be determined using the standard magic
>
--
Ian Campbell
* weasel wonders how stupid one has to be to spam alt.anonymous.messages
weasel: about half as stupid as one has to be to harvest it.
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