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Date: Wed, 23 Sep 2015 22:59:30 +0200
From: Marius Strobl <marius@alchemy.franken.de>
To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: Alexey Dokuchaev <danfe@FreeBSD.org>,
 "freebsd-sparc64@freebsd.org" <freebsd-sparc64@freebsd.org>
Subject: Re: PCI range checking under qemu-system-sparc64
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On Wed, Sep 23, 2015 at 10:43:36PM +0200, Marius Strobl wrote:
> On Wed, Sep 23, 2015 at 09:19:53AM +0100, Mark Cave-Ayland wrote:
> > 
> > I've had a quick look through the relevant PDFs and the definitions I
> > have for tick/stick are this:
> > 
> > tick:
> >   bit  63: NPT (Non-Privileged Trap enable - defaults to 1)
> >   bits 62 - 0: CPU cycle counter
> > 
> > tick_cmpr:
> >   bit  63: Interrupt disable (1 = no interrupt)
> >   bits 62 - 0: counter compare value
> > 
> > stick:
> >   bit  63: Reserved (reads 0, no write)
> >   bits 62 - 0: stick register count value
> 
> I cannot confirm that, the specification for the first sun4u CPU
> having a %stick register (UltraSPARC III, see 1, p. 6-105) up to
> the latest architecture specification (see 2, p. 60) say that bit
> 32 of %stick is NPT, just as with %tick. Same for the specification
  ^^

Err, typo, bit 63 that is of course.

Marius