From: Benjamin Herrenschmidt <bh40@calva.net>
To: David Edelsohn <dje@watson.ibm.com>, <linuxppc-dev@lists.linuxppc.org>
Subject: Re: rtc again...
Date: Fri, 4 Aug 2000 17:50:23 +0200 [thread overview]
Message-ID: <20000804155023.5420@mailhost.mipsys.com> (raw)
In-Reply-To: <200008041525.LAA30014@mal-ach.watson.ibm.com>
>
> On RS/6000 CHRP (RS/6000 Platform Architecture), RTAS provides
>freeze-time-base and thaw-time-base calls which signal all of the
>processors inan SMP complex to stop and start the TB. I do not know of
>any functionality within the PowerPC architecture which would allow
>processors to coordinate their TBs without some external intervention.
>
> Normally AIX boot freezes the TB, zeroes the TB on each processor,
>and then starts the timebase synchronized. Because the functionality is
>part of RTAS, this can be done at any time. I do not know what PreP SMP
>systems do and I know that Apple discourages use of RTAS because it is not
>intended to work.
On recent Core99 machines, Apple has a HW timer in the KeyLargo ASIC that
can be used to sync timebases. (It looks like a 64 bits bus-cycle timer,
but I'm not completely sure yet). There's also, I beleive, the OpenPIC timer.
Ben.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-08-04 15:50 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-02 22:48 rtc again Iain Sandoe
2000-08-03 9:00 ` Martin Costabel
2000-08-03 9:30 ` Benjamin Herrenschmidt
2000-08-03 10:54 ` Gabriel Paubert
2000-08-03 11:14 ` Benjamin Herrenschmidt
2000-08-03 11:25 ` Gabriel Paubert
2000-08-03 11:45 ` Gabriel Paubert
2000-08-03 13:25 ` Benjamin Herrenschmidt
2000-08-03 23:33 ` Takashi Oe
2000-08-04 8:55 ` Gabriel Paubert
2000-08-04 15:25 ` David Edelsohn
2000-08-04 15:50 ` Benjamin Herrenschmidt [this message]
2000-08-07 12:33 ` Gabriel Paubert
2000-08-07 11:51 ` Gabriel Paubert
2000-08-07 13:18 ` Benjamin Herrenschmidt
2000-08-07 15:14 ` David Edelsohn
2000-08-07 21:16 ` Gabriel Paubert
2000-08-08 1:39 ` Paul Mackerras
2000-08-11 11:04 ` Gabriel Paubert
2000-08-12 6:29 ` Paul Mackerras
2000-08-12 12:02 ` Ethan Benson
2000-08-12 12:51 ` Gabriel Paubert
2000-08-12 18:46 ` Gabriel Paubert
2000-09-17 16:47 ` dual G4 time issues Troy Benjegerdes
2000-08-14 12:59 ` rtc again Gabriel Paubert
[not found] ` <Pine.LNX.3.96LJ1.1b7.1000803182949.650C-100000@ofey.earthl ink.net>
2000-08-03 23:58 ` Franz Sirl
2000-08-04 0:33 ` Takashi Oe
2000-08-04 12:54 ` Benjamin Herrenschmidt
2000-08-04 13:40 ` Takashi Oe
2000-08-04 13:20 ` Geert Uytterhoeven
2000-08-08 11:20 ` Gabriel Paubert
2000-08-03 10:31 ` Franz Sirl
-- strict thread matches above, loose matches on Subject: below --
2000-08-03 9:41 Iain Sandoe
2000-08-03 9:56 Iain Sandoe
2000-08-03 10:13 ` Benjamin Herrenschmidt
2000-08-03 11:58 ` Martin Costabel
2000-08-03 11:24 Iain Sandoe
[not found] <20000804205524.383@192.168.1.10>
2000-08-05 1:10 ` Takashi Oe
2000-08-05 11:25 ` Benjamin Herrenschmidt
2000-08-05 14:44 ` Takashi Oe
2000-08-08 11:35 Iain Sandoe
2000-08-08 13:14 ` Geert Uytterhoeven
2000-08-08 14:31 Iain Sandoe
2000-08-08 17:08 ` Michael Schmitz
2000-08-08 17:41 ` Benjamin Herrenschmidt
2000-08-08 22:44 ` Gabriel Paubert
2000-08-09 8:44 ` Benjamin Herrenschmidt
2000-08-09 11:32 ` Martin Costabel
2000-08-09 13:50 ` Gabriel Paubert
2000-08-09 15:25 ` Benjamin Herrenschmidt
2000-08-09 16:54 ` Takashi Oe
2000-08-09 17:04 ` Benjamin Herrenschmidt
2000-08-09 23:12 ` Takashi Oe
2000-08-09 23:48 ` Benjamin Herrenschmidt
2000-08-09 22:13 ` Gabriel Paubert
2000-08-09 22:48 ` Benjamin Herrenschmidt
2000-08-10 3:08 ` Gabriel Paubert
2000-08-10 0:00 ` William Blew
2000-08-09 14:26 ` Takashi Oe
2000-08-09 0:55 ` Takashi Oe
2000-08-09 8:48 ` Benjamin Herrenschmidt
2000-08-09 16:37 ` Takashi Oe
2000-08-09 22:46 ` Gabriel Paubert
2000-08-09 14:24 ` Geert Uytterhoeven
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