linux-kernel - Re: [PATCH] x86, realmode: 16-bit real-mode code support for relocs tool

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Message-ID: <20120526234358.GA14234@kroah.com>
Date:	Sun, 27 May 2012 08:43:58 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Jarkko Sakkinen <jarkko.sakkinen@....fi>
Subject: Re: [PATCH] x86, realmode: 16-bit real-mode code support for relocs
 tool

On Fri, May 25, 2012 at 02:18:33PM +0300, Jarkko Sakkinen wrote:
> From: "H. Peter Anvin" <hpa@...ux.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
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