linux-kernel - [RFC PATCH 3/4] riscv: Instroduce Zalasr instructions

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Message-Id: <20250826145740.92276-4-luxu.kernel@bytedance.com>
Date: Tue, 26 Aug 2025 22:57:39 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	ajones@...tanamicro.com,
	brs@...osinc.com
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [RFC PATCH 3/4] riscv: Instroduce Zalasr instructions

Introduce l{b|h|w|d}.{aq|aqrl} and s{b|h|w|d}.{rl|aqrl} instruction
encodings.

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/include/asm/insn-def.h | 79 +++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/arch/riscv/include/asm/insn-def.h b/arch/riscv/include/asm/insn-def.h
index d5adbaec1d010..3fec7e66ce50f 100644
--- a/arch/riscv/include/asm/insn-def.h
+++ b/arch/riscv/include/asm/insn-def.h
@@ -179,6 +179,7 @@
 #define RV___RS1(v)		__RV_REG(v)
 #define RV___RS2(v)		__RV_REG(v)
 
+#define RV_OPCODE_AMO		RV_OPCODE(47)
 #define RV_OPCODE_MISC_MEM	RV_OPCODE(15)
 #define RV_OPCODE_OP_IMM	RV_OPCODE(19)
 #define RV_OPCODE_SYSTEM	RV_OPCODE(115)
@@ -208,6 +209,84 @@
 	__ASM_STR(.error "hlv.d requires 64-bit support")
 #endif
 
+#define LB_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LB_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LH_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LH_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LW_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LW_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define SB_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SB_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(0), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SH_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SH_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(1), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SW_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SW_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(2), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#ifdef CONFIG_64BIT
+#define LD_AQ(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(26),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define LD_AQRL(dest, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(27),			\
+	       RD(dest), RS1(addr), __RS2(0))
+
+#define SD_RL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(29),			\
+	       __RD(0), RS1(addr), RS2(src))
+
+#define SD_AQRL(src, addr)					\
+	INSN_R(OPCODE_AMO, FUNC3(3), FUNC7(31),			\
+	       __RD(0), RS1(addr), RS2(src))
+#else
+#define LD_AQ(dest, addr)					\
+	__ASM_STR(.error "ld.aq requires 64-bit support")
+
+#define LD_AQRL(dest, addr)					\
+	__ASM_STR(.error "ld.aqrl requires 64-bit support")
+
+#define SD_RL(dest, addr)					\
+	__ASM_STR(.error "sd.rl requires 64-bit support")
+
+#define SD_AQRL(dest, addr)					\
+	__ASM_STR(.error "sd.aqrl requires 64-bit support")
+#endif
+
 #define SINVAL_VMA(vaddr, asid)					\
 	INSN_R(OPCODE_SYSTEM, FUNC3(0), FUNC7(11),		\
 	       __RD(0), RS1(vaddr), RS2(asid))
-- 
2.20.1