linux-kernel - [RFC PATCH 3/5] arm64: aarch64-insn: Add barrier encodings

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Message-Id: <20210120171745.1657762-4-jthierry@redhat.com>
Date:   Wed, 20 Jan 2021 18:17:43 +0100
From:   Julien Thierry <jthierry@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        broonie@...nel.org, Julien Thierry <jthierry@...hat.com>
Subject: [RFC PATCH 3/5] arm64: aarch64-insn: Add barrier encodings

Create necessary functions to encode/decode aarch64 data/instruction
barriers.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 arch/arm64/include/asm/aarch64-insn.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/include/asm/aarch64-insn.h b/arch/arm64/include/asm/aarch64-insn.h
index 200bee726172..d0fee47bbe6e 100644
--- a/arch/arm64/include/asm/aarch64-insn.h
+++ b/arch/arm64/include/asm/aarch64-insn.h
@@ -379,6 +379,9 @@ __AARCH64_INSN_FUNCS(eret_auth,	0xFFFFFBFF, 0xD69F0BFF)
 __AARCH64_INSN_FUNCS(mrs,	0xFFF00000, 0xD5300000)
 __AARCH64_INSN_FUNCS(msr_imm,	0xFFF8F01F, 0xD500401F)
 __AARCH64_INSN_FUNCS(msr_reg,	0xFFF00000, 0xD5100000)
+__AARCH64_INSN_FUNCS(dmb,	0xFFFFF0FF, 0xD50330BF)
+__AARCH64_INSN_FUNCS(dsb,	0xFFFFF0FF, 0xD503309F)
+__AARCH64_INSN_FUNCS(isb,	0xFFFFF0FF, 0xD50330DF)
 
 #undef	__AARCH64_INSN_FUNCS
 
@@ -390,6 +393,12 @@ static inline bool aarch64_insn_is_adr_adrp(u32 insn)
 	return aarch64_insn_is_adr(insn) || aarch64_insn_is_adrp(insn);
 }
 
+static inline bool aarch64_insn_is_barrier(u32 insn)
+{
+	return aarch64_insn_is_dmb(insn) || aarch64_insn_is_dsb(insn) ||
+	       aarch64_insn_is_isb(insn);
+}
+
 enum aarch64_insn_encoding_class aarch64_get_insn_class(u32 insn);
 bool aarch64_insn_uses_literal(u32 insn);
 bool aarch64_insn_is_branch(u32 insn);
-- 
2.25.4