/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#ifndef _ASM_INST_H
#define _ASM_INST_H

#include <linux/bitops.h>

#define LOONGARCH_INSN_NOP		0x03400000

enum reg0i15_op {
	break_op	= 0x54,
};

enum reg0i26_op {
	b_op		= 0x14,
	bl_op		= 0x15,
};

enum reg1i21_op {
	beqz_op		= 0x10,
	bnez_op		= 0x11,
	bceqz_op	= 0x12, /* bits[9:8] = 0x00 */
	bcnez_op	= 0x12, /* bits[9:8] = 0x01 */
};

enum reg2_op {
	ertn_op		= 0x1920e,
};

enum reg2i12_op {
	addid_op	= 0x0b,
	andi_op		= 0x0d,
	ldd_op		= 0xa3,
	std_op		= 0xa7,
};

enum reg2i14_op {
	ldptrd_op	= 0x26,
	stptrd_op	= 0x27,
};

enum reg2i16_op {
	jirl_op		= 0x13,
	beq_op		= 0x16,
	bne_op		= 0x17,
	blt_op		= 0x18,
	bge_op		= 0x19,
	bltu_op		= 0x1a,
	bgeu_op		= 0x1b,
};

struct reg0i15_format {
	unsigned int immediate : 15;
	unsigned int opcode : 17;
};

struct reg0i26_format {
	unsigned int immediate_h : 10;
	unsigned int immediate_l : 16;
	unsigned int opcode : 6;
};

struct reg1i21_format {
	unsigned int immediate_h  : 5;
	unsigned int rj : 5;
	unsigned int immediate_l : 16;
	unsigned int opcode : 6;
};

struct reg2_format {
	unsigned int rd : 5;
	unsigned int rj : 5;
	unsigned int opcode : 22;
};

struct reg2i12_format {
	unsigned int rd : 5;
	unsigned int rj : 5;
	unsigned int immediate : 12;
	unsigned int opcode : 10;
};

struct reg2i14_format {
	unsigned int rd : 5;
	unsigned int rj : 5;
	unsigned int immediate : 14;
	unsigned int opcode : 8;
};

struct reg2i16_format {
	unsigned int rd : 5;
	unsigned int rj : 5;
	unsigned int immediate : 16;
	unsigned int opcode : 6;
};

union loongarch_instruction {
	unsigned int word;
	struct reg0i15_format	reg0i15_format;
	struct reg0i26_format	reg0i26_format;
	struct reg1i21_format	reg1i21_format;
	struct reg2_format	reg2_format;
	struct reg2i12_format	reg2i12_format;
	struct reg2i14_format	reg2i14_format;
	struct reg2i16_format	reg2i16_format;
};

#define LOONGARCH_INSN_SIZE	sizeof(union loongarch_instruction)

enum loongarch_gpr {
	LOONGARCH_GPR_ZERO = 0,
	LOONGARCH_GPR_RA = 1,
	LOONGARCH_GPR_TP = 2,
	LOONGARCH_GPR_SP = 3,
	LOONGARCH_GPR_A0 = 4,	/* Reused as V0 for return value */
	LOONGARCH_GPR_A1,	/* Reused as V1 for return value */
	LOONGARCH_GPR_A2,
	LOONGARCH_GPR_A3,
	LOONGARCH_GPR_A4,
	LOONGARCH_GPR_A5,
	LOONGARCH_GPR_A6,
	LOONGARCH_GPR_A7,
	LOONGARCH_GPR_T0 = 12,
	LOONGARCH_GPR_T1,
	LOONGARCH_GPR_T2,
	LOONGARCH_GPR_T3,
	LOONGARCH_GPR_T4,
	LOONGARCH_GPR_T5,
	LOONGARCH_GPR_T6,
	LOONGARCH_GPR_T7,
	LOONGARCH_GPR_T8,
	LOONGARCH_GPR_FP = 22,
	LOONGARCH_GPR_S0 = 23,
	LOONGARCH_GPR_S1,
	LOONGARCH_GPR_S2,
	LOONGARCH_GPR_S3,
	LOONGARCH_GPR_S4,
	LOONGARCH_GPR_S5,
	LOONGARCH_GPR_S6,
	LOONGARCH_GPR_S7,
	LOONGARCH_GPR_S8,
	LOONGARCH_GPR_MAX
};

#define DEF_EMIT_REG2I16_FORMAT(NAME, OP)				\
static inline void emit_##NAME(union loongarch_instruction *insn,	\
			       enum loongarch_gpr rj,			\
			       enum loongarch_gpr rd,			\
			       int offset)				\
{									\
	insn->reg2i16_format.opcode = OP;				\
	insn->reg2i16_format.immediate = offset;			\
	insn->reg2i16_format.rj = rj;					\
	insn->reg2i16_format.rd = rd;					\
}

DEF_EMIT_REG2I16_FORMAT(jirl, jirl_op)

#endif /* _ASM_INST_H */