diff mbox series

[02/11,v2] powerpc/fsl: Add macro to flush the branch predictor

Message ID 1545413437-5538-3-git-send-email-diana.craciun@nxp.com (mailing list archive)
State Not Applicable
Headers show
Series powerpc/fsl: NXP PowerPC Spectre variant 2 workarounds | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning next/apply_patch Patch failed to apply
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Diana Craciun Dec. 21, 2018, 5:30 p.m. UTC 
The BUCSR register can be used to invalidate the entries in the
branch prediction mechanisms.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
---
v1-->v2
- no change

 arch/powerpc/include/asm/ppc_asm.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index b5d0236..5c901bf 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -821,4 +821,14 @@  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 */