Date: Sat, 3 Aug 2013 12:01:14 -0600 From: Warner Losh <imp@bsdimp.com> To: Mark R V Murray <mark@grondar.org> Cc: "freebsd-arm@freebsd.org" <arm@freebsd.org>, Aleksandr Rybalko <ray@freebsd.org> Subject: Re: PATCH: get_cyclecount() on ARMv6 and better Message-ID: <9342F2DA-2A30-4209-B8C6-A43F194852DA@bsdimp.com> In-Reply-To: <E173CC12-0008-408B-B6BC-9FA162051C9F@grondar.org> References: <78D22A66-86E5-43B1-ABCA-7BF14F8061AB@grondar.org> <20130803145135.38196156.ray@freebsd.org> <E173CC12-0008-408B-B6BC-9FA162051C9F@grondar.org>
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On Aug 3, 2013, at 6:26 AM, Mark R V Murray wrote: > > On 3 Aug 2013, at 12:51, Aleksandr Rybalko <ray@freebsd.org> wrote: >> Hi Mark! >> >> Do we setup Performance Monitor Control Register before use that >> counter? > > I've read up on PNMC register now, an looked for it in the code, > and unless it is very well hidden, then NO, we don't set it up. > > I've read now what I need to do; where is the best place do do it? > I suspect it should be in start-up code right when the ARM is starting > up; is that a good guess? I'd make a timecounter for this, and put that in its initialization code. Warner
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