From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 07 Jun 2007 07:24:17 +0100 (BST) Received: from [222.92.8.141] ([222.92.8.141]:39825 "HELO lemote.com") by ftp.linux-mips.org with SMTP id S20022670AbXFGGYO (ORCPT ); Thu, 7 Jun 2007 07:24:14 +0100 Received: (qmail 9566 invoked by uid 511); 7 Jun 2007 06:30:41 -0000 Received: from unknown (HELO ?192.168.1.9?) (222.92.8.142) by lemote.com with SMTP; 7 Jun 2007 06:30:41 -0000 Message-ID: <4667A443.8060105@lemote.com> Date: Thu, 07 Jun 2007 14:22:59 +0800 From: Fuxin Zhang User-Agent: Thunderbird 2.0.0.0 (Windows/20070326) MIME-Version: 1.0 To: tiansm@lemote.com CC: linux-mips@linux-mips.org Subject: Re: [PATCH] override of arch/mips/mm/cache.c: __uncached_access References: <20070606182814.GD30017@linux-mips.org> <11811962573610-git-send-email-tiansm@lemote.com> In-Reply-To: <11811962573610-git-send-email-tiansm@lemote.com> Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 8bit 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: 15314 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: zhangfx@lemote.com Precedence: bulk X-list: linux-mips Recent Xorg depends on this hack/patch. For example,if we are using this memory layout: 0-256MB phys mem 256-512M pci io/mem region 512-768MB phys mem Xorg will crash due to pci video memory mapping problem. So this is not really only for Fulong. BTW: Songmao, we'd better add a comment to justify this code. tiansm@lemote.com 写道: > From: Songmao Tian > > Signed-off-by: Songmao Tian > --- > arch/mips/lemote/lm2e/Makefile | 2 +- > arch/mips/lemote/lm2e/mem.c | 25 +++++++++++++++++++++++++ > 2 files changed, 26 insertions(+), 1 deletions(-) > create mode 100644 arch/mips/lemote/lm2e/mem.c > > diff --git a/arch/mips/lemote/lm2e/Makefile b/arch/mips/lemote/lm2e/Makefile > index 0ba6f12..fb1b48c 100644 > --- a/arch/mips/lemote/lm2e/Makefile > +++ b/arch/mips/lemote/lm2e/Makefile > @@ -2,6 +2,6 @@ > # Makefile for Lemote Fulong mini-PC board. > # > > -obj-y += setup.o prom.o reset.o irq.o pci.o bonito-irq.o dbg_io.o > +obj-y += setup.o prom.o reset.o irq.o pci.o bonito-irq.o dbg_io.o mem.o > EXTRA_AFLAGS := $(CFLAGS) > > diff --git a/arch/mips/lemote/lm2e/mem.c b/arch/mips/lemote/lm2e/mem.c > new file mode 100644 > index 0000000..6068a17 > --- /dev/null > +++ b/arch/mips/lemote/lm2e/mem.c > @@ -0,0 +1,25 @@ > +/* > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2 of the License, or (at your > + * option) any later version. > + */ > + > +#include > +#include > +#include > + > +/* override of arch/mips/mm/cache.c: __uncached_access */ > +int __uncached_access(struct file *file, unsigned long addr) > +{ > + if (file->f_flags & O_SYNC) > + return 1; > + > + /* > + * on lemote loongson 2e system, peripheral register > + * reside between 0x1000 0000 and 0x2000 0000 > + */ > + return addr >= __pa(high_memory) || > + ((addr >=0x10000000) && (addr < 0x20000000)); > +} > + > -- ------------------------------------------------ 张福新 江苏中科龙梦科技有限公司 地址：江苏省常熟市虞山镇梦兰工业园 General Manager JiangSu Lemote Corp. Ltd. MengLan, Yushan, Changshu, JiangSu Province, China ZIP: 215500 Tel: 86-512-52308679 Fax: 86-512-52308688 Email: zhangfx@lemote.com http://www.lemote.com ------------------------------------------------