loongson: Flush RAS and BTB for CPU predictively execution

From b023ba02ea5c0983ffb33ff486b3b4f8b5d972e6 Mon Sep 17 00:00:00 2001
From: Wu Zhangjin <[email protected]>
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(-)

b/arch/mips/include/asm/stackframe.h
index db0fa7b..204286e 100644

@@ -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