From: Alex deVries <adevries@thepuffingroup.com>
To: Grant Grundler <grundler@cup.hp.com>
Cc: Matthew Wilcox <willy@thepuffingroup.com>,
parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] PDC calls on the C3000
Date: Mon, 17 Jan 2000 13:48:49 -0500 [thread overview]
Message-ID: <38836411.3A85639D@thepuffingroup.com> (raw)
In-Reply-To: 200001171802.KAA18011@milano.cup.hp.com
Grant Grundler wrote:
> > which takes the rightmost 30 bits from the register, zeroes the whole
> > register and then stores them back into it:
> > 0xffff'ffff'c0xx'xxxx
> > becomes
> > 0x0000'0000'00xx'xxxx
> > and now PDC is happy, and so am I.
>
> This is where the hair on the back of my neck went up.
> The problem is on L-class and N-class machine we have
> I/O and memory addresses which are > 4GB. And PDC will really
> be confused on those platforms.
Right, and so we need access to wide mode registers for those PAT PDC
calls. So I don't think we can do any of this until we have access to a
64 bit assembler.
In any case, this is not a priority right now. I think we should only
be concerned with L class starting Feb. 7. And N class isn't even on my
radar yet.
- Alex
--
Alex deVries
Director of Professional Services
The Puffins at Linuxcare
prev parent reply other threads:[~2000-01-17 19:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-01-17 15:57 [parisc-linux] PDC calls on the C3000 Matthew Wilcox
2000-01-17 18:02 ` Grant Grundler
2000-01-17 18:34 ` Matthew Wilcox
2000-01-17 18:48 ` Alex deVries [this message]
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