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/*
* 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"
#include "memory.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;
/* User or Supervisor mode */
int mode;
/* Configurable processor features */
bool has_mul; /* mul, muli */
bool has_mulx; /* mulxss, mulxsu, mulxuu */
bool has_div; /* div, divu */
bool has_mmu; /* Memory Management Unit */
struct memory *mem;
/* Exception handler address */
uint32_t exception_handler_addr;
};
/* Aliases for general-purpose 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,
};
/* status register fields */
#define NIOS2_STATUS_PIE 0
#define NIOS2_STATUS_U 1
#define NIOS2_STATUS_EH 2
/* exception causes */
#define NIOS2_EX_RESET 0
#define NIOS2_EX_PROC_ONLY_RESET 1
#define NIOS2_EX_IRQ 2
#define NIOS2_EX_UNIMPLEMENTED 4
#define NIOS2_EX_DIV_ERR 8
#define NIOS2_EX_SUPERVISOR_ONLY_I 9
#define NIOS2_EX_SUPERVISOR_ONLY_D 11
#define NIOS2_EX_FAST_TLB_MISS 12
enum {
NIOS2_SUPERVISOR_MODE,
NIOS2_USER_MODE,
};
extern void nios2_cpu_reset(struct nios2 *cpu);
extern void nios2_cpu_init(struct nios2 *cpu);
extern void nios2_simulate(struct nios2 *cpu);
extern void nios2_cpu_inc_pc(struct nios2 *cpu);
extern bool nios2_in_user_mode(struct nios2 *cpu);
extern bool nios2_in_supervisor_mode(struct nios2 *cpu);
extern void nios2_exception(struct nios2 *cpu, uint8_t cause);
extern uint32_t nios2_fetch_instr(struct nios2 *cpu);
extern int nios2_execute_instr(struct nios2 *cpu, uint32_t instr);
extern int nios2_load(struct nios2 *cpu, uint32_t addr, void *data, size_t size);
extern int nios2_store(struct nios2 *cpu, uint32_t addr, void *data, size_t size);
extern void nios2_dump_registers(struct nios2 *cpu);
#endif /* _NIOS2_H_ */
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