From: David Gordon Hogan <dhog@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] /sys/src/^(9 boot)^/pc/memory.c
Date: Tue, 17 Sep 2002 18:04:56 -0400 [thread overview]
Message-ID: <7b2d0cba0ec72119063d975d74e0ddae@plan9.bell-labs.com> (raw)
> Oops. I did not combine using the wavelan and trying
> to use the i81x driver. If I do have a wavelan in the
> pcmcia slot and I let aux/vga be run (trying i81x on
> thinkpad R31, mouseport ps2, vgasize 640x480x8, monitor xga)
> I get:
>
> panic: mmuwalk2: va 80526000 entry 4001E3
The i81x driver uses mmuwalk() to get the PTE of a single
page that it allocates for the hardware cursor. It needs this
to mark the memory as uncached, otherwise the hardware
cursor won't update correctly. Unfortunately, this strategy
only works if the cursor is allocated in the first 4M of memory.
After that, it isn't possible to single out an individual page
in the kernel virtual mapping. Hence the panic.
I'm not sure how to fix this. It might be neccesary to change
the page table to make the appropriate 4M region use a level
2 page table.
next prev reply other threads:[~2002-09-17 22:04 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <dhog@plan9.bell-labs.com>
2001-06-18 18:48 ` [9fans] source code as data not text David Gordon Hogan
2001-06-18 21:31 ` Steve Kilbane
2001-06-19 21:03 ` Richard Elberger
2001-06-19 21:31 ` Steve Kilbane
2001-06-19 7:36 ` Richard Elberger
2001-06-28 22:17 ` Boyd Roberts
2001-07-11 17:53 ` [9fans] sam vs acme David Gordon Hogan
2001-07-11 19:19 ` James A. Robinson
2001-07-11 21:15 ` Steve Kilbane
2001-07-11 23:11 ` Boyd Roberts
2001-11-01 21:19 ` [9fans] Virtual memory in BSD and Plan9 David Gordon Hogan
2001-11-01 21:23 ` Scott Schwartz
2001-11-21 0:12 ` [9fans] on TCP vs IL David Gordon Hogan
2001-11-21 0:21 ` George Michaelson
2001-11-22 9:57 ` Thomas Bushnell, BSG
2001-11-23 9:34 ` Douglas A. Gwyn
2001-11-26 10:00 ` Thomas Bushnell, BSG
2001-11-26 15:21 ` Douglas A. Gwyn
2001-12-07 19:41 ` [9fans] libXg/test.c David Gordon Hogan
2001-12-07 20:08 ` Boyd Roberts
2001-12-07 20:09 ` Scott Schwartz
2001-12-07 20:28 ` Boyd Roberts
2001-12-10 10:01 ` Maarit Maliniemi
2001-12-11 16:51 ` Leo Caves
2002-09-17 22:04 ` David Gordon Hogan [this message]
2002-09-17 22:08 ` [9fans] /sys/src/^(9 boot)^/pc/memory.c Scott Schwartz
2002-09-17 2:40 YAMANASHI Takeshi
2002-09-17 2:58 Russ Cox
2002-09-17 4:19 YAMANASHI Takeshi
2002-09-17 7:57 Charles Forsyth
2002-09-17 15:13 ` Axel Belinfante
2002-09-17 20:08 ` Axel Belinfante
2002-09-17 20:37 ` Axel Belinfante
2002-09-17 22:56 rob pike, esq.
2002-09-17 22:58 Russ Cox
2002-09-17 23:41 ` paurea
2002-09-17 23:13 rob pike, esq.
2002-09-18 4:18 ` Lucio De Re
2002-09-18 16:42 ` rob pike, esq.
2002-09-18 12:08 ` Lucio De Re
2002-09-18 1:26 Russ Cox
2002-09-18 5:31 ` paurea
2002-09-18 4:49 Russ Cox
2002-09-18 5:02 ` Lucio De Re
2002-09-18 11:38 Russ Cox
2002-09-18 23:21 ` paurea
2002-09-18 16:46 Charles Forsyth
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