Re: Interrupt level in system call

"Valeriy E. Ushakov" <[email protected]> Sun, 8 Oct 2006 22:27:41 +0400

Newsgroups	gmane.os.netbsd.ports.sh3
Message-ID	<[email protected]>

On Sat, Jul 22, 2006 at 06:53:24 +0400, Valeriy E. Ushakov wrote:

> On Fri, Jul 21, 2006 at 12:33:15 +0900, Masao Uebayashi wrote:
> 
> > A co-worker found a problem that system calls in kernel mode are
> > running in the highest interrupt level (SR:I[3-0] == 1111).
> 
> Oops.
> 
> 
> > Can't they safely run in the lowest interrupt level?
> 
> They should.

I've fixed general_exception() to drop back to the previous spl level
(from SSR) - which improves things quite a bit already (e.g. running
cu from a wscons terminal (i.e. slow rasops output) doesn't cause scif
to lose incoming chars).

tlb_exception() needs to be fixed too.

SY, Uwe
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