linux-kernel - Re: x86 embedded - Problem getting past 'move compressed kernel before decompression'

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Message-ID: <4B80CA55.3040402@zytor.com>
Date:	Sat, 20 Feb 2010 21:53:25 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Graeme Russ <graeme.russ@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: x86 embedded - Problem getting past 'move compressed kernel before
 decompression'

On 02/20/2010 09:45 PM, H. Peter Anvin wrote:
> 
> Instead, do something like:
> 
> 	asm volatile(
>  		"movl	%0, %%ds\n" \
>  		"movl	%0, %%es\n" \
>  		"movl	%0, %%fs\n" \
>  		"movl	%0, %%gs\n" \
> 		"movl	%0, %%ss\n" \
> 		"xorl	%ebp, %ebp\n" \
> 		"xorl	%ebx, %ebx\n" \
>  		"movl   $0x100000, %%eax\n" \
>  		"ljmpl	$0x10,$0x100000"
> 	 : : "S" (&boot_params), "D" (0), "c" (0x18));
> 
> 	-hpa
> 

Make that:

 	asm volatile(
  		"movl	%2, %%ds\n" \
  		"movl	%2, %%es\n" \
  		"movl	%2, %%fs\n" \
  		"movl	%2, %%gs\n" \
 		"movl	%2, %%ss\n" \
 		"xorl	%ebp, %ebp\n" \
 		"xorl	%ebx, %ebx\n" \
  		"ljmpl	$0x10,$0x100000"
 	 : : "S" (&boot_params), "D" (0), "r" (0x18));

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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