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From: "David S. Miller" <davem@redhat.com>
To: phillips@arcor.de
Cc: imran.badr@cavium.com, linux-kernel@vger.kernel.org
Subject: Re: Calculating kernel logical address ..
Date: Sun, 08 Sep 2002 22:00:08 -0700 (PDT)	[thread overview]
Message-ID: <20020908.220008.79156946.davem@redhat.com> (raw)
In-Reply-To: <E17oGD2-0006lP-00@starship>

   From: Daniel Phillips <phillips@arcor.de>
   Date: Sun, 8 Sep 2002 20:44:17 +0200

   > For anything else you're in non-portablt land, including and
   > in partiular:
   > 
   > 1) kernel stack addresses
   
   Could you elaborate on what bad things happen here?
   
Kernel stack allocation is defined per-architecture.  On
sun4c sparc systems, we carve virtual pages out from the kernel
address space and hard map them into the TLB by hand.

   > 2) addresses within the main kernel image text/data/bss
   
   Yep.  MIPS's KSEG0 (a stupid design if there ever was one)

Actually, KSEG0 the most Linux friendly design in the world
particularly in 64-bit mode.  There is no need to have page tables at
all for the main kernel physical memory map.  It would shave a lot of
code from the sparc64 TLB miss handlers if I didn't have to handle
PAGE_OFFSET pages, for example.

Alpha does something akin to KSEG0 as well.

I pine constantly for it appearing some day on a future UltraSPARC
revision :-)

  reply	other threads:[~2002-09-09  5:03 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-04 22:00 BYTE Unix Benchmarks Version 3.6 Paolo Ciarrocchi
2002-09-04 22:44 ` Cliff White
2002-09-04 23:57 ` Andrea Arcangeli
2002-09-05 13:48 ` side-by-side " bert hubert
2002-09-05 15:11   ` venom
2002-09-06  3:23   ` Daniel Phillips
2002-09-06  3:34     ` Calculating kernel logical address Imran Badr
2002-09-07  1:44       ` Daniel Phillips
2002-09-08  0:01         ` David S. Miller
2002-09-08 18:44           ` Daniel Phillips
2002-09-09  5:00             ` David S. Miller [this message]
2002-09-09  5:17               ` Daniel Phillips
2002-09-09  5:28                 ` David S. Miller
2002-09-06  7:09     ` side-by-side Re: BYTE Unix Benchmarks Version 3.6 bert hubert
  -- strict thread matches above, loose matches on Subject: below --
2002-09-06 15:44 Calculating kernel logical address Manfred Spraul
2002-09-06 17:13 ` Imran Badr
2002-09-07  1:57   ` Daniel Phillips
2002-09-09 17:06 Imran Badr
2002-09-09 17:29 ` Richard B. Johnson
2002-09-09 17:23   ` David S. Miller
2002-09-09 17:34     ` Martin J. Bligh
2002-09-09 17:40     ` Daniel Phillips
2002-09-09 17:31   ` Imran Badr
2002-09-09 18:00     ` Richard B. Johnson
2002-09-09 18:12       ` Imran Badr
2002-09-09 18:27         ` Daniel Phillips
2002-09-09 18:41           ` Imran Badr
2002-09-09 21:55         ` Alan Cox
2002-09-09 22:52           ` Imran Badr
2002-09-09 23:09             ` Alan Cox
2002-09-09 18:13       ` Jesse Barnes
2002-09-09 18:25         ` Daniel Phillips
2002-09-09 19:40           ` Andrew Morton
2002-09-09 20:41             ` Daniel Phillips
2002-09-10  6:43               ` Jens Axboe
2002-09-10  7:12                 ` Andrew Morton
2002-09-09 18:42         ` Andrew Morton
2002-09-10  7:03           ` Gerd Knorr
2002-09-09 18:16       ` Kurt Ferreira
2002-09-09 18:17       ` David S. Miller
2002-09-09 18:17       ` Daniel Phillips
2002-09-09 18:43         ` Richard B. Johnson
2002-09-09 18:50           ` Daniel Phillips
2002-09-09 18:57             ` Richard B. Johnson
2002-09-09 18:08     ` Andrew Morton
2002-09-09 18:23       ` Daniel Phillips
2002-09-09 18:49         ` Imran Badr
2002-09-09 18:46           ` David S. Miller
2002-09-09 19:06           ` Daniel Phillips
2002-09-09 19:14             ` Andrew Morton
2002-09-09 19:23               ` Imran Badr
2002-09-09 21:02 Manfred Spraul
2002-09-09 21:07 ` Imran Badr
2002-09-09 21:19 Manfred Spraul
2002-09-09 21:47 ` Andrew Morton
2002-09-10 17:01   ` Manfred Spraul

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