/*
 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2010 chysun2000@gmail.com
 *
 * This file is part of nios2sim-ng.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _NIOS2_H_
#define _NIOS2_H_

#include "instruction.h"

#define NIOS2_GP_REG_COUNT	32
/* there are really 32, but 16-31 are reserved for future use */
#define NIOS2_CTRL_REG_COUNT	16

struct nios2 {
	/* General-Purpose Registers */
	uint32_t gp_regs[NIOS2_GP_REG_COUNT];
	/* Control Registers */
	uint32_t ctrl_regs[NIOS2_CTRL_REG_COUNT];
	/* Program counter */
	uint32_t pc;
};

/* Aliases for general-purpors registers */
enum {
	zero = 0,
	at,
	et = 24,
	bt,
	gp,
	sp,
	fp,
	ea,
	ba,
	ra,
};

/* Aliases for control registers */
enum {
	status = 0,
	estatus,
	bstatus,
	ienable,
	ipending,
	cpuid,
	/* reserved */
	exception = 7,
	pteaddr,
	tlbacc,
	tlbmisc,
	/* reserved */
	badaddr = 12,
	config,
	mpubase,
	mpuacc,

};

extern void nios2_cpu_reset(struct nios2 *cpu);

#endif /* _NIOS2_H_ */