From: Greg KH <gregkh@linuxfoundation.org>
To: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
stable@vger.kernel.org, linux-kernel@vger.kernel.org,
"H. Peter Anvin" <hpa@linux.intel.com>,
Jarkko Sakkinen <jarkko.sakkinen@iki.fi>
Subject: Re: [PATCH] x86, realmode: 16-bit real-mode code support for relocs tool
Date: Sun, 27 May 2012 08:43:58 +0900 [thread overview]
Message-ID: <20120526234358.GA14234@kroah.com> (raw)
In-Reply-To: <1337944713-20044-1-git-send-email-jarkko.sakkinen@intel.com>
On Fri, May 25, 2012 at 02:18:33PM +0300, Jarkko Sakkinen wrote:
> From: "H. Peter Anvin" <hpa@linux.intel.com>
>
> A new option is added to the relocs tool called '--realmode'.
> This option causes the generation of 16-bit segment relocations
> and 32-bit linear relocations for the real-mode code. When
> the real-mode code is moved to the low-memory during kernel
> initialization, these relocation entries can be used to
> relocate the code properly.
>
> In the assembly code 16-bit segment relocations must be relative
> to the 'real_mode_seg' absolute symbol. Linear relocations must be
> relative to a symbol prefixed with 'pa_'.
>
> 16-bit segment relocation is used to load cs:ip in 16-bit code.
> Linear relocations are used in the 32-bit code for relocatable
> data references. They are declared in the linker script of the
> real-mode code.
>
> The relocs tool is moved to arch/x86/tools/relocs.c, and added new
> target archscripts that can be used to build scripts needed building
> an architecture. be compiled before building the arch/x86 tree.
>
> [ hpa: accelerating this because it detects invalid absolute
> relocations, a serious bug in binutils 2.22.52.0.x which currently
> produces bad kernels. ]
>
> [ jsakkine: applied against 3.3.7 ]
Much better, thanks for this, now queued up.
greg k-h
next prev parent reply other threads:[~2012-05-26 23:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-25 11:18 [PATCH] x86, realmode: 16-bit real-mode code support for relocs tool Jarkko Sakkinen
2012-05-26 23:43 ` Greg KH [this message]
-- strict thread matches above, loose matches on Subject: below --
2012-05-25 5:44 Jarkko Sakkinen
2012-05-25 6:05 ` Greg KH
2012-05-25 11:20 ` Jarkko Sakkinen
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