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Subject: Re: svn commit: r323580 - in head/sys/arm: arm include
From: Andrew Turner <andrew@fubar.geek.nz>
In-Reply-To: <2385698.hFNfOSpqlD@ralph.baldwin.cx>
Date: Thu, 14 Sep 2017 17:27:14 +0100
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To: John Baldwin <jhb@freebsd.org>
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> On 14 Sep 2017, at 15:54, John Baldwin <jhb@freebsd.org> wrote:
>=20
> On Thursday, September 14, 2017 02:30:44 PM John Baldwin wrote:
>> Author: jhb
>> Date: Thu Sep 14 14:30:43 2017
>> New Revision: 323580
>> URL: https://svnweb.freebsd.org/changeset/base/323580
>>=20
>> Log:
>>  Add AT_HWCAP flags for VFP settings for FreeBSD/arm.
>>=20
>>  These flags match the meaning and value of flags in Linux, though
>>  Linux has many more flags.
>>=20
>>  Reviewed by:	stevek, Michal Meloun <meloun-miracle-cz> =
(earlier version)
>>  MFC after:	1 month
>>  Differential Revision:	https://reviews.freebsd.org/D12291
>=20
> It would probably be good to add HWCAP_NEON if someone knows the right =
things
> to check to detect it.

You=E2=80=99ll need to check the mvfr1 register for it. Linux checks the =
A_SIMD SPFP, A_SIMD integer, and A_SIMD load/store fields are all 1.

Andrew=20