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Date: Thu, 5 Apr 2007 20:55:53 +1200
From: Andrew Turner <andrew@fubar.geek.nz>
To: grehan@freebsd.org
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Cc: freebsd-ppc@freebsd.org
Subject: Re: Exception in openfirmware calling
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On Tue, 03 Apr 2007 17:16:32 -0700
Peter Grehan <grehan@freebsd.org> wrote:

> > I've used the ofw_stack code from NetBSD for now. It creates a new
> > stack with a real address.
> 
>   That will work, though I don't like the way it's implemented: the 
> calls in all of the OFW routines is a little ugly. My plan was to
> have a call_onstack() routine that would allow a function to be
> executed on a specified stack. This can be used in other places too,
> such as when the initial thread has to switch over to it's allocated
> stack.
I've managed to use it to get to the point when FreeBSD complains there
is no network devices to mount root from. The OF_read and OF_write calls
need the ofw_stack. I also allocated a page of real memory that I copy
the string to display to in OF_write and read the input data from in
OF_read. It is not the best fix but it does allow me to work on other
parts of the kernel.

Andrew