From: Diana Craciun <diana.craciun@nxp.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Diana Craciun <diana.craciun@nxp.com>
Subject: [PATCH 02/11 v2] powerpc/fsl: Add macro to flush the branch predictor
Date: Fri, 21 Dec 2018 19:30:28 +0200 [thread overview]
Message-ID: <1545413437-5538-3-git-send-email-diana.craciun@nxp.com> (raw)
In-Reply-To: <1545413437-5538-1-git-send-email-diana.craciun@nxp.com>
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 --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 */
--
2.5.5
next prev parent reply other threads:[~2018-12-21 17:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-21 17:30 [PATCH 00/11 v2] powerpc/fsl: NXP PowerPC Spectre variant 2 workarounds Diana Craciun
2018-12-21 17:30 ` [PATCH 01/11 v2] powerpc/fsl: Add infrastructure to fixup branch predictor flush Diana Craciun
2018-12-21 17:30 ` Diana Craciun [this message]
2018-12-21 17:30 ` [PATCH 03/11 v2] powerpc/fsl: Fix spectre_v2 mitigations reporting Diana Craciun
2018-12-21 17:30 ` [PATCH 04/11 v2] powerpc/fsl: Emulate SPRN_BUCSR register Diana Craciun
2018-12-21 17:30 ` [PATCH 05/11 v2] powerpc/fsl: Add nospectre_v2 command line argument Diana Craciun
2018-12-21 17:30 ` [PATCH 06/11 v2] powerpc/fsl: Flush the branch predictor at each kernel entry (64bit) Diana Craciun
2018-12-21 17:30 ` [PATCH 07/11 v2] powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) Diana Craciun
2018-12-21 17:30 ` [PATCH 08/11 v2] powerpc/fsl: Flush branch predictor when entering KVM Diana Craciun
2018-12-21 17:30 ` [PATCH 09/11 v2] powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used Diana Craciun
2018-12-21 17:30 ` [PATCH 10/11 v2] powerpc/fsl: Update Spectre v2 reporting Diana Craciun
2018-12-21 17:30 ` [PATCH 11/11 v2] powerpc/fsl: Add FSL_PPC_BOOK3E as supported arch for nospectre_v2 boot arg Diana Craciun
2018-12-22 10:07 ` [PATCH 00/11 v2] powerpc/fsl: NXP PowerPC Spectre variant 2 workarounds Michael Ellerman
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