From: Thiemo Seufer <ths@networkno.de>
To: Franck Bui-Huu <vagabon.xyz@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
Subject: Re: [PATCH] setup.c: introduce __pa_symbol() and get ride of CPHYSADDR()
Date: Mon, 9 Oct 2006 14:21:32 +0100 [thread overview]
Message-ID: <20061009132131.GA18308@networkno.de> (raw)
In-Reply-To: <452A3953.4060802@innova-card.com>
Franck Bui-Huu wrote:
> Thiemo Seufer wrote:
> > Franck Bui-Huu wrote:
> >>
> >> - if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
> >> + if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
> >
> > ISTR this failed on O2, where kernel+initrd are loaded into KSEG0 but the
> > PAGE_OFFSET is for XKPHYS.
> >
>
> I guess that you were meaning somthing like:
>
> LOADADDR = 0xffffffff80004000
> PAGE_OFFSET = 0xa800000000000000
>
> is that correct ?
Yes.
> If so could you explain the choice of these values
> because I fail to understand it.
It allows to load a 64-bit kernel in KSEG0, and use short 2-instruction
symbol references there. At the same time, it allows access to more
address space for memory and I/O than would fit in KSEG0.
Thiemo
next prev parent reply other threads:[~2006-10-09 13:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-06 13:36 [PATCH] setup.c: introduce __pa_symbol() and get ride of CPHYSADDR() Franck Bui-Huu
2006-10-06 17:21 ` Thiemo Seufer
2006-10-09 11:58 ` Franck Bui-Huu
2006-10-09 13:21 ` Thiemo Seufer [this message]
2006-10-09 14:25 ` Franck Bui-Huu
2006-10-09 14:58 ` Thiemo Seufer
2006-10-09 15:30 ` Franck Bui-Huu
2006-10-09 15:51 ` Atsushi Nemoto
2006-10-09 16:59 ` Thiemo Seufer
2006-10-10 8:49 ` Atsushi Nemoto
2006-10-10 13:49 ` Franck Bui-Huu
2006-10-10 14:19 ` Atsushi Nemoto
2006-10-10 15:01 ` Franck Bui-Huu
2006-10-10 15:29 ` Atsushi Nemoto
2006-10-10 16:04 ` Franck Bui-Huu
2006-10-10 16:16 ` Franck Bui-Huu
2006-10-10 21:51 ` Ralf Baechle
2006-10-11 3:11 ` Atsushi Nemoto
2006-10-11 9:37 ` Franck Bui-Huu
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