Date: Sun, 4 Aug 2013 08:43:57 +0100 From: Mark R V Murray <mark@grondar.org> To: Aleksandr Rybalko <ray@freebsd.org> Cc: "freebsd-arm@freebsd.org" <arm@freebsd.org> Subject: Re: PATCH: get_cyclecount() on ARMv6 and better Message-ID: <5923E430-A98D-4396-ACD3-83654B7F5D84@grondar.org> In-Reply-To: <20130804011535.b87e1f39.ray@freebsd.org> References: <78D22A66-86E5-43B1-ABCA-7BF14F8061AB@grondar.org> <20130803145135.38196156.ray@freebsd.org> <E173CC12-0008-408B-B6BC-9FA162051C9F@grondar.org> <9342F2DA-2A30-4209-B8C6-A43F194852DA@bsdimp.com> <20130804011535.b87e1f39.ray@freebsd.org>
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--Apple-Mail=_F002862B-D3A8-4559-B246-2B577EA01389 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii On 3 Aug 2013, at 23:15, Aleksandr Rybalko <ray@freebsd.org> wrote: > Another potential useful thing, not to close it under #ifdef ARMv6, but > check ARM processor Feature registers. > MRC p15, 0, <Rt>, c0, c1, 2; Read Debug Feature Register 0 > Here is [27:24] bits - Performance monitor model, zero - lack of PMU. > But unfortunately, Cortex-A8 have no such bits, but have CCNT reg. :) Thanks for the hint, but it soinnds like I'm going to need a bit more expert knowledge here. So what will work on all ARMs, then? M -- Mark R V Murray --Apple-Mail=_F002862B-D3A8-4559-B246-2B577EA01389 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.20 (Darwin) Comment: GPGTools - http://gpgtools.org iQCVAwUBUf4GRN58vKOKE6LNAQrfBgP/XdLHrW5vNf7PQ11CKOsCLajq1nQfcL36 rwqay7afALHdJ7G/zPZaDLuTJWXf4+pUlKjMuLNJVwQkvF3dJAcXi0WCI9XGMKJZ Cl2UTb36dnbPuTuiuGFbtny+Eu7xgfM/VproTihLDWgKni6RSNDsAte6xXmQJRv+ i8WUotXgTBo= =JEq+ -----END PGP SIGNATURE----- --Apple-Mail=_F002862B-D3A8-4559-B246-2B577EA01389--
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