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Re: GNU Mach: disabling all network device drivers

From: Samuel Thibault
Subject: Re: GNU Mach: disabling all network device drivers
Date: Wed, 19 May 2010 16:42:40 +0200
User-agent: Mutt/1.5.12-2006-07-14

Zheng Da, le Thu 13 May 2010 08:59:59 -0400, a écrit :
> general protection trap. I tried several drivers and always got the
> same problem.
> The error can be seen at http://i.imagehost.org/0382/Screenshot.png.
> addr2line shows me 0x1076e6 is at
> /root/gnumach-build/../gnumach/i386/i386/spl.S:217
> I don't know whether the error is caused by my change in gnumach or
> the error exists in
> gnumach itself. It's probably not very easy to check as the error
> occurs when a user-level
> driver runs.

I'd tend to guess that what happens is that some interrupt was disabled
before the spl() call but got triggered and is thus pending. As soon as
spl() enables it, the chipset actually raises the interrupt, the CPU
enters the interrupt handler, etc. and somehow that handler doesn't
properly restore the stack (i.e. the bug would not be in spl() at all,
but in some interrupt handler).

How do you route interrupts from GNU Mach to the user-level driver?


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