> -----Original Message-----
> From: linux-ia64-owner@xxxxxxxxxxxxxxx
> [mailto:linux-ia64-owner@xxxxxxxxxxxxxxx] On Behalf Of Takao Indoh
> Sent: 2006年9月6日 17:23
> To: Keith Owens
> Cc: fastboot@xxxxxxxxxxxxxx; linux-ia64@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH]IA64 kexec/kdump patch for INIT
>
> On Wed, 06 Sep 2006 18:06:53 +0900, Takao Indoh wrote:
>
> >>>+ /* change region of gp to region5 */
> >>>+ asm volatile ("movl gp=__gp"::: "memory");
> >>
> >>Why? gp is already pointing at the kernel code before we enter
> >>ia64_init_handler().
> >
> >The purpose of this code is just changing region of gp from region7 to
> >region5. For example, if gp is e000000004ace170, I want to change gp to
> ~~~~~~~~~~~~~~~~e000000000ace170
> Sorry, I mistook address...
>
>
> Regards,
> Takao Indoh
>
You don't need to set gp here. Control page does not use GP, and purgatory code will set GP to a physical address which was pre-calculated at the time of crash kernel loading.
Thanks
Zou Nan hai
>
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