Re: [Linux-ia64] Re: [PATCH] head.S fix for unusual load addrs

From: Jesse Barnes <>
Date: 2003-05-08 10:00:45
On Wed, May 07, 2003 at 04:51:21PM -0700, David Mosberger wrote:
> Hi Tony,
> Great summary!

Yeah, thanks.  It's a good outline of our options.

>   Tony> 3) David's suggestion of boot-time relocation.  Probably
>   Tony> simplest to implement this in elilo, but if you are really
>   Tony> good at PIC asm code it could be done in the kernel startup
>   Tony> sequence.
> Agreed.  Anyone who's ever debugged the startup code will agree
> that it's much better to do the relocation in elilo.
>   Tony>  pros) Just like linking kernel at a new address.  Avoids the
>   Tony> __tpa() issue.  Doesn't invalidate any assumptions about how
>   Tony> to get from virtual to physical addresses and back again.
>   Tony>  cons) Nobody has implemented it.
> I think:
> 	- kernel text addresses vary depending on physical memory conf.
> is potentially a bigger issue.  Implementing the relocator in elilo
> should be really easy (just take the kernel loader and massage it a
> bit).
> How many tools are out there that depend on or similar?  I
> suppose you could just generate a fresh at boot time (or
> have something like /proc/

Ahh, this might be a good way to go.  We'd basically be relinking the
kernel at load time with a new KERNEL_START, right?  I haven't looked
at the new module loader code yet (in fact, I've never done any linker
stuff), but I will now.

Received on Wed May 07 17:01:09 2003

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:14 EST