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

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Date:	Sun, 21 Feb 2010 01:11:47 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<hpa@...or.com>, <graeme.russ@...il.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: RE: x86 embedded - Problem getting past 'move compressed kernel
 before decompression'


> 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));
Or if you don't want a far jmp, something like this for non-PIC:

asm volatile(

"movl %4, %%ds\n" \

"movl %4, %%es\n" \

"movl %4, %%fs\n" \

"movl %4, %%gs\n" \

"movl %4, %%ss\n" \

"xorl %ebp, %ebp\n" \

"jmpl *%3"

: : "S" (&boot_params), "D" (0), "b" (0), "r" (0x100000), "r" (0x18));

This for PIC:


asm volatile(


"movl %3, %%ds\n" \


"movl %3, %%es\n" \


"movl %3, %%fs\n" \


"movl %3, %%gs\n" \


"movl %3, %%ss\n" \


"xorl %ebp, %ebp\n" \
"xorl %ebx, %ebx\n" \


"jmpl *%2"


: : "S" (&boot_params), "D" (0), "r" (0x100000), "r" (0x18));


Yuhong Bao 		 	   		  
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