From: David Howells <dhowells@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linux Torvalds <torvalds@transmeta.com>,
bcrl@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: Using %cr2 to reference "current"
Date: Wed, 07 Nov 2001 15:32:07 +0000 [thread overview]
Message-ID: <1820.1005147127@warthog.cambridge.redhat.com> (raw)
In-Reply-To: Message from Alan Cox <alan@lxorguk.ukuu.org.uk> of "Wed, 07 Nov 2001 14:54:00 GMT." <E161U5Y-0004Lc-00@the-village.bc.nu>
Instead of using %cr2, how about giving each CPU it's own GDT (the GDT doesn't
need to contain many entries). Have one segment number point to a CPU specific
data area that contains things like the current task pointer for that CPU, the
CPU number, etc, etc. This same segment number will be used on all CPU's, but
will be multiplexed via the per-CPU GDTs instead.
Then you can load up a segment register with this segment on entry to the
kernel, and then make CPU data accesses relative to that.
David
next prev parent reply other threads:[~2001-11-07 15:32 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-06 7:18 Using %cr2 to reference "current" H. Peter Anvin
2001-11-06 8:01 ` Robert Love
2001-11-06 10:55 ` Alan Cox
2001-11-06 17:31 ` Michael Barabanov
2001-11-06 14:14 ` Manfred Spraul
2001-11-06 10:58 ` Alan Cox
2001-11-06 17:04 ` Linus Torvalds
2001-11-06 17:46 ` Alan Cox
2001-11-06 17:59 ` Linus Torvalds
2001-11-06 18:14 ` Alan Cox
2001-11-06 16:55 ` Marcelo Tosatti
2001-11-06 18:14 ` Linus Torvalds
2001-11-06 18:31 ` Alan Cox
2001-11-06 22:38 ` Linus Torvalds
2001-11-07 0:00 ` Martin Dalecki
2001-11-06 23:19 ` Alan Cox
2001-11-07 0:43 ` Martin Dalecki
2001-11-07 0:27 ` Alan Cox
2001-11-07 0:35 ` Jeff Garzik
2001-11-07 14:00 ` Martin Dalecki
2001-11-07 13:38 ` Alan Cox
2001-11-07 14:59 ` Martin Dalecki
2001-11-07 14:17 ` Alan Cox
2001-11-07 14:34 ` Dirk Moerenhout
2001-11-07 14:54 ` Alan Cox
2001-11-07 15:32 ` David Howells [this message]
2001-11-07 14:39 ` Intel compiler [Re: Using %cr2 to reference "current"] Sebastian Heidl
2001-11-07 22:05 ` lists
2001-11-07 15:36 ` Using %cr2 to reference "current" Martin Dalecki
2001-11-08 14:08 ` Martin Dalecki
2001-11-13 16:49 ` Merge BUG in 2.4.15-pre4 serial.c Martin Dalecki
2001-11-13 16:21 ` Russell King
2001-11-13 17:37 ` Martin Dalecki
2001-11-13 16:53 ` Russell King
2001-11-13 18:05 ` Martin Dalecki
2001-11-13 17:11 ` Alan Cox
2001-11-13 18:23 ` Martin Dalecki
2001-11-07 20:04 ` Using %cr2 to reference "current" Andrew Morton
2001-11-11 13:16 ` Martin Dalecki
2001-11-11 13:06 ` Keith Owens
2001-11-12 11:28 ` PATCH 2.4.14 mregparm=3 compilation fixes Martin Dalecki
2001-11-12 16:10 ` Keith Owens
2001-11-12 16:25 ` Christoph Hellwig
2001-11-12 17:56 ` Martin Dalecki
2001-11-12 16:42 ` Linus Torvalds
2001-11-12 18:51 ` Martin Dalecki
2001-11-12 20:05 ` Corsspatch patch-2.4.15-pre2 patch-2.4.15-pre3 Martin Dalecki
2001-11-12 20:13 ` BUG BUG hunt the bugs!!! patch-2.4.15-pre5 Martin Dalecki
2001-11-06 17:02 ` Using %cr2 to reference "current" Linus Torvalds
2001-11-06 17:13 ` Benjamin LaHaise
2001-11-06 17:49 ` Linus Torvalds
2001-11-06 18:19 ` Alan Cox
2001-11-09 21:52 ` Jamie Lokier
2001-11-06 18:42 ` Benjamin LaHaise
2001-11-06 19:09 ` H. Peter Anvin
2001-11-06 19:16 ` Dave Jones
2001-11-06 20:10 ` Ricky Beam
2001-11-06 23:09 ` Alan Cox
2001-11-06 23:15 ` Dave Jones
-- strict thread matches above, loose matches on Subject: below --
2001-11-06 22:05 Mikael Pettersson
2002-11-10 21:23 Igor Levicki
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