2012/7/23 Ram Tummala <[email protected]>
> On Jul 23, 2012, at 9:32 AM, Fan Yang <[email protected]> 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 > > > > _______________________________________________ > > Kernelnewbies mailing list > > [email protected] > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > May be I can work it by adding a new syscall in the kernel, right?
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