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Date: Mon, 27 Dec 2004 09:56:16 +0200
From: Tom Alsberg <alsbergt@cs.huji.ac.il>
To: FreeBSD Hackers List <freebsd-hackers@freebsd.org>
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Subject: i386_set_ioperm on FreeBSD 5.3
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X-List-Received-Date: Mon, 27 Dec 2004 07:56:41 -0000

Hi there.

I'm trying to use some code I wrote quite a while ago using Doug
White's FreeBSD IPMI code (kcs.c, send-kcs-command.c, etc.).

It still works as it did back then on FreeBSD 4.10.  On FreeBSD 5.3 it
does not.

Problem seems to be, that i386_set_ioperm isn't doing what it should.
The program gets SIGBUS when doing outb, while it shouldn't.

I looked in /usr/src/sys/i386/i386/sys_machdep.c, not many changes
from 4.10 - all except one are additions that would return an error in
case of failure.  One seems to be quite modest (struct change):

-       if (p->p_addr->u_pcb.pcb_ext == 0)
-               if ((error = i386_extend_pcb(p)) != 0)
+       if (td->td_pcb->pcb_ext == 0)
+               if ((error = i386_extend_pcb(td)) != 0)

Yet, clearly something fails on FreeBSD 5.3.  I can confirm that this
is indeed the problem with a few-line program that will
i386_set_ioperm and then try to do outb.  Any idea if i386_set_ioperm
broke somehow in 5.3?  Haven't checked much, but it seems that the
data it is changing is not being used after all.

  Thanks, any help appreciated,
  -- Tom

-- 
  Tom Alsberg - hacker (being the best description fitting this space)
  Web page:	http://www.cs.huji.ac.il/~alsbergt/
DISCLAIMER:  The above message does not even necessarily represent what
my fingers have typed on the keyboard, save anything further.