[PATCH 20/30] loongson: Flush RAS and BTB for CPU predictively execution

To:	linux-mips@linux-mips.org, Ralf Baechle <ralf@linux-mips.org>
Subject:	[PATCH 20/30] loongson: Flush RAS and BTB for CPU predictively execution
From:	Wu Zhangjin <wuzhangjin@gmail.com>
Date:	Sat, 16 May 2009 06:19:37 +0800
Cc:	Arnaud Patard <apatard@mandriva.com>, loongson-dev@googlegroups.com, zhangfx@lemote.com, yanh@lemote.com, Philippe Vachon <philippe@cowpig.ca>, Zhang Le <r0bertz@gentoo.org>, Erwan Lerale <erwan@thiscow.com>
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Original-recipient:	rfc822;linux-mips@linux-mips.org
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>From b023ba02ea5c0983ffb33ff486b3b4f8b5d972e6 Mon Sep 17 00:00:00 2001
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Sat, 16 May 2009 04:32:13 +0800
Subject: [PATCH 20/30] loongson: Flush RAS and BTB for CPU predictively
execution

---
 arch/mips/include/asm/stackframe.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/mips/include/asm/stackframe.h
b/arch/mips/include/asm/stackframe.h
index db0fa7b..204286e 100644
--- a/arch/mips/include/asm/stackframe.h
+++ b/arch/mips/include/asm/stackframe.h
@@ -117,6 +117,24 @@
                .endm
 #else
                .macro  get_saved_sp    /* Uniprocessor variation */
+#ifdef CONFIG_CPU_LOONGSON2
+               move k0,ra
+               jal 2008f
+               nop
+               2008:
+               jal 2008f
+               nop
+               2008:
+               jal 2008f
+               nop
+               2008:
+               jal 2008f
+               nop
+               2008:
+               move ra,k0
+               li k0,3
+               mtc0 k0,$22
+#endif
 #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
                lui     k1, %hi(kernelsp)
 #else
-- 
1.6.2.1

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