From: Dan Malek <dan@embeddededge.com>
To: Paul Mackerras <paulus@samba.org>
Cc: linux-ppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: Re: [PATCH] add big endian version of ld_/st_ IO access macros and convert main 8xx code to use it
Date: Thu, 8 Sep 2005 09:56:52 -0400 [thread overview]
Message-ID: <d8324773c7d1a644a85a535515ac5726@embeddededge.com> (raw)
In-Reply-To: <17183.48543.616634.628331@cargo.ozlabs.ibm.com>
On Sep 8, 2005, at 12:27 AM, Paul Mackerras wrote:
> Given how long it takes to access I/O devices, I don't believe an
> extra instruction or two is going to make a measurable difference.
That's kind of true. However, the access to the CPM is nearly
instruction speed, except in the case when you actually use a
real IO register (like a GPIO on a port), then it's a little slower.
-- Dan
next prev parent reply other threads:[~2005-09-08 13:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-07 23:03 [PATCH] add big endian version of ld_/st_ IO access macros and convert main 8xx code to use it Marcelo Tosatti
2005-09-08 0:28 ` Benjamin Herrenschmidt
2005-09-08 0:42 ` Dan Malek
2005-09-08 0:55 ` Benjamin Herrenschmidt
2005-09-08 0:58 ` Marcelo Tosatti
2005-09-08 4:27 ` Paul Mackerras
2005-09-08 13:56 ` Dan Malek [this message]
2005-09-08 19:34 ` Marcelo Tosatti
2005-09-08 0:51 ` Marcelo Tosatti
2005-09-08 1:14 ` Benjamin Herrenschmidt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=d8324773c7d1a644a85a535515ac5726@embeddededge.com \
--to=dan@embeddededge.com \
--cc=linuxppc-embedded@ozlabs.org \
--cc=paulus@samba.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).