Re: [patch] Fix GDT re-load on ACPI resume

[David Weinehall]

On Mon, Nov 15, 2004 at 03:35:14PM -0500, Nickolai Zeldovich wrote:
> The ACPI resume code currently uses a real-mode 16-bit lgdt instruction to
> reload the GDT.  This only restores the lower 24 bits of the GDT base
> address.  In recent kernels, the GDT seems to have moved out of the lower
> 16 megs, thereby causing the ACPI resume to fail -- an invalid GDT was
> being loaded.
> 
> This simple patch adds the 0x66 prefix to lgdt, which forces it to load
> all 32 bits of the GDT base address, thereby removing any restrictions on
> where the GDT can be placed in memory.  This makes ACPI resume work for me
> on a Thinkpad T40 laptop.

Sadly doesn't work for me.  ACPI resume broke for me with
2.6.10-rc1-bk15 (possibly 14, but that one didn't compile), and this
patch does not fix it.


Regards: David Weinehall
-- 
 /) David Weinehall <tao@xxxxxxxxxx> /) Northern lights wander      (\
//  Maintainer of the v2.0 kernel   //  Dance across the winter sky //
\)  http://www.acc.umu.se/~tao/    (/   Full colour fire           (/
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