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Sender: Emil Renner Berthing <emil.renner.berthing@gmail.com>
From:   Emil Renner Berthing <kernel@esmil.dk>
To:     linux-riscv@lists.infradead.org
Cc:     Emil Renner Berthing <kernel@esmil.dk>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Jason Baron <jbaron@akamai.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        Alexandre Ghiti <alex@ghiti.fr>,
        Jisheng Zhang <jszhang@kernel.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v1 3/7] riscv: Add asm/insn.h header
Date:   Mon, 31 Jan 2022 19:21:41 +0100
Message-Id: <20220131182145.236005-4-kernel@esmil.dk>
In-Reply-To: <20220131182145.236005-1-kernel@esmil.dk>
References: <20220131182145.236005-1-kernel@esmil.dk>
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Add new asm/insn.h header to consolidate RISC-V instruction constants
and inline helper functions.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---
 arch/riscv/include/asm/insn.h | 121 ++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 arch/riscv/include/asm/insn.h

diff --git a/arch/riscv/include/asm/insn.h b/arch/riscv/include/asm/insn.h
new file mode 100644
index 000000000000..2bdb089390f0
--- /dev/null
+++ b/arch/riscv/include/asm/insn.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Emil Renner Berthing
+ */
+#ifndef __ASM_RISCV_INSN_H
+#define __ASM_RISCV_INSN_H
+
+#include <linux/const.h>
+
+#define RISCV_INSN_LD		_AC(0x00003003, U)
+#define RISCV_INSN_ADDI		_AC(0x00000013, U)
+#define RISCV_INSN_NOP		RISCV_INSN_ADDI
+#define RISCV_INSN_AUIPC	_AC(0x00000017, U)
+#define RISCV_INSN_LUI		_AC(0x00000037, U)
+#define RISCV_INSN_JALR		_AC(0x00000067, U)
+#define RISCV_INSN_JAL		_AC(0x0000006f, U)
+
+#define RISCV_INSN_RA		_AC(0x1, U)
+#define RISCV_INSN_T0		_AC(0x5, U)
+#define RISCV_INSN_T1		_AC(0x6, U)
+
+#define RISCV_INSN_RD_POS	7
+#define RISCV_INSN_RD_RA	(RISCV_INSN_RA << RISCV_INSN_RD_POS)
+#define RISCV_INSN_RD_T0	(RISCV_INSN_T0 << RISCV_INSN_RD_POS)
+#define RISCV_INSN_RD_T1	(RISCV_INSN_T1 << RISCV_INSN_RD_POS)
+
+#define RISCV_INSN_RS1_POS	15
+#define RISCV_INSN_RS1_RA	(RISCV_INSN_RA << RISCV_INSN_RS1_POS)
+#define RISCV_INSN_RS1_T0	(RISCV_INSN_T0 << RISCV_INSN_RS1_POS)
+#define RISCV_INSN_RS1_T1	(RISCV_INSN_T1 << RISCV_INSN_RS1_POS)
+
+#define RISCV_INSN_I_IMM_MASK	_AC(0xfff00000, U)
+#define RISCV_INSN_S_IMM_MASK	_AC(0xfe000f80, U)
+#define RISCV_INSN_B_IMM_MASK	_AC(0xfe000f80, U)
+#define RISCV_INSN_U_IMM_MASK	_AC(0xfffff000, U)
+#define RISCV_INSN_J_IMM_MASK	_AC(0xfffff000, U)
+
+#define RISCV_INSN_CI_IMM_MASK	_AC(0x107c, U)
+#define RISCV_INSN_CSS_IMM_MASK	_AC(0x1f80, U)
+#define RISCV_INSN_CIW_IMM_MASK	_AC(0x1fe0, U)
+#define RISCV_INSN_CL_IMM_MASK	_AC(0x1c60, U)
+#define RISCV_INSN_CS_IMM_MASK	_AC(0x1c60, U)
+#define RISCV_INSN_CB_IMM_MASK	_AC(0x1c7c, U)
+#define RISCV_INSN_CJ_IMM_MASK	_AC(0x1ffc, U)
+
+#ifndef __ASSEMBLY__
+#include <linux/bits.h>
+#include <asm/types.h>
+
+static inline bool riscv_insn_valid_20bit_offset(ptrdiff_t val)
+{
+	return !(val & 1) && -(1L << 19) <= val && val < (1L << 19);
+}
+
+static inline bool riscv_insn_valid_32bit_offset(ptrdiff_t val)
+{
+	if (IS_ENABLED(CONFIG_32BIT))
+		return true;
+
+	/*
+	 * auipc+jalr can reach any PC-relative offset in the range
+	 * [-2^31 - 2^11, 2^31 - 2^11)
+	 */
+	return (-(1L << 31) - (1L << 11)) <= val && val < ((1L << 31) - (1L << 11));
+}
+
+static inline u32 riscv_insn_i_imm(u32 imm)
+{
+	return (imm & GENMASK(11, 0)) << 20;
+}
+
+static inline u32 riscv_insn_s_imm(u32 imm)
+{
+	return (imm & GENMASK( 4, 0)) << ( 7 - 0) |
+	       (imm & GENMASK(11, 5)) << (25 - 5);
+}
+
+static inline u32 riscv_insn_b_imm(u32 imm)
+{
+	return (imm & GENMASK(11, 11)) >> (11 -  7) |
+	       (imm & GENMASK( 4,  1)) << ( 8 -  1) |
+	       (imm & GENMASK(10,  5)) << (25 -  5) |
+	       (imm & GENMASK(12, 12)) << (31 - 12);
+}
+
+static inline u32 riscv_insn_u_imm(u32 imm)
+{
+	return imm & GENMASK(31, 12);
+}
+
+static inline u32 riscv_insn_j_imm(u32 imm)
+{
+	return (imm & GENMASK(19, 12)) << (12 - 12) |
+	       (imm & GENMASK(11, 11)) << (20 - 11) |
+	       (imm & GENMASK(10,  1)) << (21 -  1) |
+	       (imm & GENMASK(20, 20)) << (31 - 20);
+}
+
+static inline u16 riscv_insn_rvc_branch_imm(u16 imm)
+{
+	return (imm & GENMASK(5, 5)) >> ( 5 - 2) |
+	       (imm & GENMASK(2, 1)) << ( 3 - 1) |
+	       (imm & GENMASK(7, 6)) >> ( 6 - 5) |
+	       (imm & GENMASK(4, 3)) << (10 - 3) |
+	       (imm & GENMASK(8, 8)) << (12 - 8);
+}
+
+static inline u16 riscv_insn_rvc_jump_imm(u16 imm)
+{
+	return (imm & GENMASK( 5,  5)) >> ( 5 -  2) |
+	       (imm & GENMASK( 3,  1)) << ( 3 -  1) |
+	       (imm & GENMASK( 7,  7)) >> ( 7 -  6) |
+	       (imm & GENMASK( 6,  6)) << ( 7 -  6) |
+	       (imm & GENMASK(10, 10)) >> (10 -  8) |
+	       (imm & GENMASK( 9,  8)) << ( 9 -  8) |
+	       (imm & GENMASK( 4,  4)) << (11 -  4) |
+	       (imm & GENMASK(11, 11)) << (12 - 11);
+}
+
+#endif
+#endif
-- 
2.35.1