From owner-freebsd-arm@FreeBSD.ORG  Wed Feb 11 17:41:50 2015
Return-Path: <owner-freebsd-arm@FreeBSD.ORG>
Delivered-To: freebsd-arm@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 450E4E6A
 for <freebsd-arm@freebsd.org>; Wed, 11 Feb 2015 17:41:50 +0000 (UTC)
Received: from mail-qg0-x22b.google.com (mail-qg0-x22b.google.com
 [IPv6:2607:f8b0:400d:c04::22b])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id F2D72CD
 for <freebsd-arm@freebsd.org>; Wed, 11 Feb 2015 17:41:49 +0000 (UTC)
Received: by mail-qg0-f43.google.com with SMTP id i50so3894226qgf.2
 for <freebsd-arm@freebsd.org>; Wed, 11 Feb 2015 09:41:49 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:from:date:message-id:subject:to:content-type;
 bh=vBFNA4k6J1ZH5VN0vievYNJeemhLc3dP2ry+6JLPvdI=;
 b=VQQniogCwiwO2vtKHasL7YcC/faFI2ruEY7w+j9HT0nK1S3mqylia07zYLYXbZCujI
 VWu4PmlojK1Cx/5JidmPBKNy4knCvNe67lOhy5D9l2yLEY7tLuF1Q4ymbMJVYGNL5js9
 5GvgwB54xPcJNz0T62bnsUHN9PXkG3zp7iJ+u5/NUFiVMepAHRCN/X3jQRU1MUy+UQKq
 zrpMyk9jrVKsab2UE2XHkA85zsmB7IWhZn6YBvwRCZMj4sJyjAB2WIF90602wA7MvCHW
 kRUChhT5OwfSdMrnJ0/U577T0Uk25IYMVOVWCOr16QTqsVCIDzWEzXkyQozdwRelM9mq
 1sAQ==
X-Received: by 10.140.48.137 with SMTP id o9mr31608293qga.89.1423676509153;
 Wed, 11 Feb 2015 09:41:49 -0800 (PST)
MIME-Version: 1.0
Sender: carpeddiem@gmail.com
Received: by 10.140.39.209 with HTTP; Wed, 11 Feb 2015 09:41:28 -0800 (PST)
From: Ed Maste <emaste@freebsd.org>
Date: Wed, 11 Feb 2015 12:41:28 -0500
X-Google-Sender-Auth: WfbC8_7c-yMiGElPqVZhPam-UFs
Message-ID: <CAPyFy2A=Ev5gdYPKgEE0LS3-1sY+XmkZA7VCe71E6Fmbb=vMRw@mail.gmail.com>
Subject: FreeBSD/arm64 MACHINE/MACHINE_ARCH identification
To: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
Content-Type: text/plain; charset=UTF-8
X-BeenThere: freebsd-arm@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: "Porting FreeBSD to ARM processors." <freebsd-arm.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm/>
List-Post: <mailto:freebsd-arm@freebsd.org>
List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 11 Feb 2015 17:41:50 -0000

The FreeBSD/arm64 work in progress currently reports "arm64" for the
machine and processor type - i.e., uname -m and uname -p.

It seems that the official, awkward name aarch64 is broadly used
elsewhere - for example, in toolchain triples and autoconf tests.  To
save us grief in the future I think it is worth following suit:

diff --git a/sys/arm64/include/param.h b/sys/arm64/include/param.h
index 5cd0445..525a0e7 100644
--- a/sys/arm64/include/param.h
+++ b/sys/arm64/include/param.h
@@ -43,10 +43,10 @@
 #define STACKALIGN(p)  ((uint64_t)(p) & ~STACKALIGNBYTES)

 #ifndef MACHINE
-#define        MACHINE         "arm64"
+#define        MACHINE         "aarch64"
 #endif
 #ifndef MACHINE_ARCH
-#define        MACHINE_ARCH    "arm64"
+#define        MACHINE_ARCH    "aarch64"
 #endif

I'm not proposing that we rename any of the source files.  I believe
this approach is consistent with the Debian project - they call it the
"arm64" port, but report aarch64 from uname.

I believe it will be much easier for us to carry around any
special-case s/aarch64/arm64/ in the base system (if necessary) than
trying to teach third-party software that the FreeBSD 64-bit ARM
architecture is called arm64 instead of aarch64.

Any objections or concerns?