From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 01 Oct 2007 10:11:48 +0100 (BST) Received: from n6.bullet.mud.yahoo.com ([216.252.100.57]:36949 "HELO n6.bullet.mud.yahoo.com") by ftp.linux-mips.org with SMTP id S20022052AbXJAJLj (ORCPT ); Mon, 1 Oct 2007 10:11:39 +0100 Received: from [68.142.194.244] by n6.bullet.mud.yahoo.com with NNFMP; 01 Oct 2007 09:10:17 -0000 Received: from [209.191.119.163] by t2.bullet.mud.yahoo.com with NNFMP; 01 Oct 2007 09:10:17 -0000 Received: from [127.0.0.1] by omp102.mail.mud.yahoo.com with NNFMP; 01 Oct 2007 09:10:17 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 130687.14103.bm@omp102.mail.mud.yahoo.com Received: (qmail 35417 invoked by uid 60001); 1 Oct 2007 09:04:33 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.in; h=X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=lUVapiL1EKJnQozhcUV8Go1a4BzqxjAdmJst7d0WMrogji9z0oVMERAXx+UfrPvswLbvpLf0XOZ+w1tVryHaTjv8c3sM6Zv/onTj/4igs0/ESJNfAOBRkcDZNRbsLhMZpz2WEjS1p0SEIvzxLxc4AnKs0gM6tTACvHc1QatGQFg=; X-YMail-OSG: OvqjJSIVM1k_lSVRAynBOP_A43iN1H_VzB1zKuh_Bsd6U_rNdd8hCJ7YDDBBBSvEl6mpv3CG8S3CblaZVZjTJfBgdqq9I4fWKvzRWeEnf3bX9SghKLoaIpCUk2P1HQ-- Received: from [199.239.167.162] by web8401.mail.in.yahoo.com via HTTP; Mon, 01 Oct 2007 10:04:32 BST Date: Mon, 1 Oct 2007 10:04:32 +0100 (BST) From: veerasena reddy Subject: linux cache routines for Write-back cache policy on MIPS24KE To: linux-mips , "linux-kernel.org" MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <119374.35234.qm@web8401.mail.in.yahoo.com> 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: 16752 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: veerasena_b@yahoo.co.in Precedence: bulk X-list: linux-mips Hi, I have ported Linux-2.6.18 kernel on MIPS24KE processor. I am using write back cache policy. Could you please guide me under what cases the below cache API's are being used: - dma_cache_wback_inv() : Could you explain what exactly this function does - dma_cache_wback() : This function write back the cache data to memory - dma_cache_inv : This function invalidate the cache tags. so subsequent access will fetch from memory. Once I looked the above function definitions in linux-2.6.18/arch/mips/mm/c-r4k.c. All these function's implemetation are same except bc_wbak_inv() is called in both dma_cache_wback-inv() and dma_cache_wback(), where as bc_inv() is called in case of dma_cache_inv. Also, bc_inv()/bc_wbak_inv are define as null implementation for R4000. That means all three functions are doing same functionality in case of R4000. What are the difference between these three functions. Under what cases these functions are used. Please guide me if you have any links which will explain these API's. Thanks in advance. Regards, Veerasena. Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php