How can I change cr0 register in redhat system

[Ram Tummala]

On Jul 23, 2012, at 9:32 AM, Fan Yang <lljyangfan at gmail.com> wrote:

> hi all:
>        when I change the cr0 register I get a "Segmentation fault (core dumped)".
>        my code is :
>
>
> .data
> .text
> .global _start
> _start:
>         movl %eax, %cr0
>
>       this code can work well in ubuntu system when I use root to run it. So what can I do to work it in redhat system?
Changing a control register is a privileged operation. You can't do it
from the user space. You can only do it from ring 0.

Venkatram Tummala
>
>      thanks
>
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