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From: Grant Grundler <grundler@parisc-linux.org>
To: Joel Soete <soete.joel@tiscali.be>
Cc: parisc-linux <parisc-linux@lists.parisc-linux.org>
Subject: Re: copy_user_page_asm suggested 64bit improvment [Was: [parisc-linux]	clear user page test]
Date: Thu, 30 Dec 2004 01:10:34 -0700	[thread overview]
Message-ID: <20041230081034.GD31297@colo.lackof.org> (raw)
In-Reply-To: <20041227073654.GI29492@colo.lackof.org>

On Mon, Dec 27, 2004 at 12:36:54AM -0700, Grant Grundler wrote:
> Anyone know how many cycles ldd from L1 takes?

I found the answer for PCX-W CPU:
	The PCXW Data cache is a 4-way set associative 1 MB cache, split
	into two banks and interleaved on double word boundaries to allow
	two simultaneous uses of the cache. Each bank is further divided
	into independent tag and data ports, primarily to allow effective
	single cycle stores. The two tags hold identical information.
	Each port returns data in two cycles, but can start a new access
	every cycle.

I'll assume PA8[567]00 CPUs have similar if not identical behavior.
PA8800 may not and I'd be curious if anyone knows.

I've just committed a "simple" version that uses r19/20/21/22.
I've got another version that also uses r23/r24 but it didn't boot
and I didn't chase down why. It's possibly a HW bug with this particular
A500. I'll try it again.

Lamont tells me r23/24/28/29 are *caller* saves registers. 
Ie I could r28/29 as well (or instead of r23/24).

thanks,
grant
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  parent reply	other threads:[~2004-12-30  8:10 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <418A80E8000124B5@mail-6-bnl.tiscali.it>
2004-12-27  7:36 ` copy_user_page_asm suggested 64bit improvment [Was: [parisc-linux] clear user page test] Grant Grundler
2004-12-27 10:40   ` Joel Soete
2004-12-27 15:08     ` James Bottomley
2004-12-31 20:26       ` Michael S. Zick
2004-12-31 20:56         ` Grant Grundler
2004-12-31 21:35           ` Michael S. Zick
     [not found]             ` <20041231225447.GC23592@colo.lackof.org>
2004-12-31 23:56               ` Michael S. Zick
2005-01-12 13:52               ` Michael S. Zick
2005-01-12 15:32                 ` Joel Soete
2004-12-31 21:21         ` James Bottomley
2004-12-27 17:34     ` Joel Soete
2004-12-27 18:32     ` Joel Soete
2004-12-28 16:25   ` [parisc-linux] Re: copy_user_page_asm suggested 64bit improvment (Test case) Joel Soete
2004-12-29  5:46     ` Grant Grundler
2004-12-29 11:36       ` Joel Soete
2004-12-30  8:10   ` Grant Grundler [this message]
2004-12-30 17:04     ` [parisc-linux] Re: copy_user_page_asm suggested 64bit improvment [Was: [parisc-l John David Anglin
     [not found] <20041210190333.GC6653@colo.lackof.org>
     [not found] ` <418A811700010466@mail-8-bnl.mail.tiscali.sys>
     [not found]   ` <20041213180758.GA8705@colo.lackof.org>
     [not found]     ` <41C34C56.4080508@tiscali.be>
     [not found]       ` <20041218073036.GA29003@colo.lackof.org>
     [not found]         ` <41C440A3.6060708@tiscali.be>
     [not found]           ` <41C4872D.6010705@tiscali.be>
     [not found]             ` <41C4A35A.7010003@tiscali.be>
     [not found]               ` <20041219042528.GB15282@colo.lackof.org>
     [not found]                 ` <41C5D761.4030004@tiscali.be>
2004-12-19 20:27                   ` copy_user_page_asm suggested 64bit improvment [Was: [parisc-linux] clear user page test] Joel Soete

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