From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Wed, 12 Sep 2007 17:53:32 +0100 (BST) Received: from localhost.localdomain ([127.0.0.1]:23260 "EHLO dl5rb.ham-radio-op.net") by ftp.linux-mips.org with ESMTP id S20023186AbXILQxa (ORCPT ); Wed, 12 Sep 2007 17:53:30 +0100 Received: from denk.linux-mips.net (denk.linux-mips.net [127.0.0.1]) by dl5rb.ham-radio-op.net (8.14.1/8.13.8) with ESMTP id l8CGrURX010259; Wed, 12 Sep 2007 17:53:30 +0100 Received: (from ralf@localhost) by denk.linux-mips.net (8.14.1/8.14.1/Submit) id l8CGrU3P010258; Wed, 12 Sep 2007 17:53:30 +0100 Date: Wed, 12 Sep 2007 17:53:30 +0100 From: Ralf Baechle To: zhuzhenhua Cc: linux-mips Subject: Re: does the SAVE_ALL nesting in kernel? Message-ID: <20070912165330.GH4571@linux-mips.org> References: <50c9a2250709111921g1b49cb0du7f97ebb3e1fb7d07@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <50c9a2250709111921g1b49cb0du7f97ebb3e1fb7d07@mail.gmail.com> User-Agent: Mutt/1.5.14 (2007-02-12) Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 16480 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Wed, Sep 12, 2007 at 10:21:53AM +0800, zhuzhenhua wrote: > i have a mips board, and the SDRAM speed(bus clock) is not too > fast. > so i want change the SAVE_ALL and RESTORE_ALL to use > internal-ram(high speed). > i just wonder whether the SAVE_ALL netsting in kernel for mips > arch? > if not, i think maybe 1k byte for SAVE_ALL is enough( 32regs > X4, and some cp0_regs). > but if the SAVE_ALL nesting, maybe i need to keep a stack in > internal-ram. > thanks for any hints． Nesting works but due to the use of k0/k1 you need to ensure SAVE_ALL is only invoked with interrupts disabled. Ralf