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Re: GNU Mach: disabling all network device drivers

From: Da Zheng
Subject: Re: GNU Mach: disabling all network device drivers
Date: Thu, 20 May 2010 14:57:30 +0800
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv: Gecko/20100317 Thunderbird/3.0.4

On 10-5-19 下午10:42, Samuel Thibault wrote:
> 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?
interrupts for dde drivers are captured in linux_intr(). I first record the
interrupt in the list and then use a dedicated thread to deliver interrupt
messages to the user space.

Zheng Da

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