Subject: Re: Kernel copyin/out optimizations for ARM...
To: David Laight <>
From: Jason R Thorpe <>
List: port-arm
Date: 03/16/2002 16:47:19
On Sat, Mar 16, 2002 at 09:50:45PM +0000, David Laight wrote:

 > ok, todays code - and I'm definititly not playing with it again!
 > Copies aligned chunk of each page with ldmia/stmia.

Well, it doesn't work :-)

First of all, I had to futz with the numbered-labels.  Our ELF assembler
does like e.g. 11$.  I'm pretty sure I got the translation to gas-style
numbered-labels right :-)

Secondly, after managing to fork a few processes on an SA-110, it

panic: kernel diagnostic assertion "umap->refcount != 0" failed: file "/u1/netbsd/src/sys/arch/shark/compile/SHAG-SHARK/../../../../uvm/uvm_bio.c", line 253

Looks like it's not honoring write-protection properly somewhere.

        -- Jason R. Thorpe <>