Re: Vmware crashes if compress/misc.c scrolls?

[Zachary Amsden <zach@vmware.com>]

H. Peter Anvin wrote:
> Zachary Amsden wrote:
>   
>> I'm failing to understand exactly what the failure here is.  Can you
>> provide sample code that generates the problem?  Surely, it should be
>> possible to read the framebuffer.
>>
>>     
>
> The supposed test case was leaving the cursor at the bottommost line on
> the screen before running the Linux kernel.
>   

Do you have a sample bootsector that does this?  I would very much like 
to try booting it rather than writing a mock-up which may or may not 
exhibit the same behavior.  .iso, floppy images greatly would help.

The very good news is that I should be able to tell you exactly why the 
exception occurs.  My first thought was perhaps a GDT foul-up resulted 
in a read-only code segment, and mov %cs:(a000) was faulting or 
something like that, but this is a total stab in the dark.

Thanks,

Zach