From: Diana Craciun <diana.craciun@nxp.com>
Date: Wed, 12 Dec 2018 14:03:01 +0000 (+0200)
Subject: powerpc/fsl: Add macro to flush the branch predictor
X-Git-Tag: for-linus-20190104~90^2~70
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=1cbf8990d79ff69da8ad09e8a3df014e1494462b;p=linux-block.git

powerpc/fsl: Add macro to flush the branch predictor

The BUCSR register can be used to invalidate the entries in the
branch prediction mechanisms.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 378432995eb7..e0637730a8e7 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -806,4 +806,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
 	stringify_in_c(.long (_target) - . ;)	\
 	stringify_in_c(.previous)
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+#define BTB_FLUSH(reg)			\
+	lis reg,BUCSR_INIT@h;		\
+	ori reg,reg,BUCSR_INIT@l;	\
+	mtspr SPRN_BUCSR,reg;		\
+	isync;
+#else
+#define BTB_FLUSH(reg)
+#endif /* CONFIG_PPC_FSL_BOOK3E */
+
 #endif /* _ASM_POWERPC_PPC_ASM_H */