From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752203Ab0CIRTc (ORCPT ); Tue, 9 Mar 2010 12:19:32 -0500 Received: from mail-fx0-f213.google.com ([209.85.220.213]:43931 "EHLO mail-fx0-f213.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751414Ab0CIRT3 (ORCPT ); Tue, 9 Mar 2010 12:19:29 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :mime-version:content-type:content-transfer-encoding; b=uws2FXVvp60uh7KSEz2R5A8Q8PLpEBI38zyYfcrAYMP/nFb5otPiFBhN3XFPfwxUE5 S+2fQ8gWZ1ePN9JBq2wJ8yU2HArwUqw+tg4ec5nFMPm8GuFBoL2s+3g6fxkOaJaxw+Yf K4NPDVIzS14AUh4r60Ln2VUK4W+hvSRHpnPUM= From: Wu Zhangjin To: Ralf Baechle , Greg KH Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Wu Zhangjin Subject: [PATCH 1/3] Loongson-2F: Flush the branch target history such as BTB and RAS Date: Wed, 10 Mar 2010 01:12:31 +0800 Message-Id: X-Mailer: git-send-email 1.7.0.1 In-Reply-To: References: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wu Zhangjin As the Chapter 15: "Errata: Issue of Out-of-order in loongson"[1] shows, to workaround the Issue of Loongson-2F，We need to do: "When switching from user model to kernel model, you should flush the branch target history such as BTB and RAS." This patch did clear BTB(branch target buffer), forbid RAS(row address strobe) via Loongson-2F's 64bit diagnostic register. [1] Chinese Version: http://www.loongson.cn/uploadfile/file/200808211 [2] English Version of Chapter 15: http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source Signed-off-by: Wu Zhangjin --- arch/mips/include/asm/stackframe.h | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index 3b6da33..b84cfda 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -121,6 +121,25 @@ .endm #else .macro get_saved_sp /* Uniprocessor variation */ +#ifdef CONFIG_CPU_LOONGSON2F + /* + * Clear BTB(branch target buffer), forbid RAS(row address + * strobe) to workaround the Out-of-oder Issue in Loongson2F + * via it's diagnostic register. + */ + move k0, ra + jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: move ra, k0 + li k0, 3 + mtc0 k0, $22 +#endif /* CONFIG_CPU_LOONGSON2F */ #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else -- 1.7.0.1