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From: Vivek Goyal <>
To: Etienne Lorrain <>
Cc: "H. Peter Anvin" <>,,
	"Eric W. Biederman" <>
Subject: Re: Re : [PATCH] Compressed ia32 ELF file generation for loading by Gujin 1/3
Date: Wed, 7 Feb 2007 12:14:32 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, Feb 06, 2007 at 01:12:05PM +0000, Etienne Lorrain wrote:
> > Building real mode code with kernel binary (vmlinux) has got another
> > disadvantage that it breaks using vmlinux for kdump purposes. One compiles
> > the kernel binary to execute from a different address but real mode code/data
> > will continue to be at virtual/physical addr 0 and kexec can not load it
> > as that physical memory is not available at all. Kdump skips the real mode
> > code execution.
>  But that is exactly what you want and need for kdump, isn't it?
>  The ELF file did not change, the program header has the last index at
> address 0 that you do not want to load because you do not want to
> execute the real-mode code. Load the rest and provide the 4 Kbytes
> parameter page - it should work.

How do I know which program header is real mode code and the boot loader
is not supposed to load it? May be PT_LOAD header with physical addr 0?
What happens if changes happen and down the line we start compiling 
real mode code for non-zero address? Hence I think keeping real mode
code out of vmlinux might prove to be a good idea.

Secondly, if you compile real mode code with vmlinux, what would be the
entry point for this ELF file? Real mode entry? Then I have not way to
find out from ELF headers where is the protected mode entry point and
I can not do use this vmlinux with kexec/kdump. 

OTOH, now bzImage is relocatable. Is this image going to be relocatable?
How do we take care of that?


  reply	other threads:[~2007-02-07  6:44 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06 13:12 Etienne Lorrain
2007-02-07  6:44 ` Vivek Goyal [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-02-11 20:49 RE : " Eric W. Biederman
2007-02-12 10:42 ` Etienne Lorrain
2007-02-12 12:29   ` Eric W. Biederman
2007-02-12 13:58     ` Etienne Lorrain
2007-02-12 14:06     ` H. Peter Anvin
2007-02-12 19:47       ` Eric W. Biederman
2007-02-08 13:10 Etienne Lorrain
2007-02-09  5:59 ` Vivek Goyal
2007-02-09 13:04   ` Etienne Lorrain
2007-02-09 19:42     ` Eric W. Biederman
2007-02-08  9:48 Etienne Lorrain
2007-02-08 11:20 ` Eric W. Biederman
2007-02-08 11:37 ` Vivek Goyal
2007-02-08 12:10   ` Eric W. Biederman
2007-02-07 14:29 Etienne Lorrain
2007-02-07 17:12 ` H. Peter Anvin
2007-02-06 17:23 Etienne Lorrain
2007-02-06 17:34 ` H. Peter Anvin
2007-02-06 18:12 ` Eric W. Biederman
2007-02-06 13:23 Etienne Lorrain
2007-02-06 12:49 Etienne Lorrain

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