cpu.h

/*
 * TamaLIB - A hardware agnostic Tamagotchi P1 emulation library
 *
 * Copyright (C) 2021 Jean-Christophe Rona <jc@rona.fr>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#ifndef _CPU_H_
#define _CPU_H_

#include "hal.h"

#define MEMORY_SIZE        0x140 // MEM_RAM_SIZE + MEM_IO_SIZE

#define MEM_RAM_ADDR        0x000
#define MEM_RAM_SIZE        0x280

#define MEM_DISPLAY1_ADDR     0xE00
#define MEM_DISPLAY1_ADDR_OFS 0xB80
#define MEM_DISPLAY1_SIZE     0x050

#define MEM_DISPLAY2_ADDR     0xE80
#define MEM_DISPLAY2_ADDR_OFS 0xBB0
#define MEM_DISPLAY2_SIZE     0x050

#define MEM_IO_ADDR       0xF00
//#define MEM_IO_ADDR_OFS   0xBE0
#define MEM_IO_ADDR_OFS   0xF00
#define MEM_IO_SIZE       0x080

typedef struct breakpoint {
  u13_t addr;
  struct breakpoint *next;
} breakpoint_t;


typedef struct {
  u4_t factor_flag_reg;
  u4_t mask_reg;
  bool_t triggered; /* 1 if triggered, 0 otherwise */
  u8_t vector;
} interrupt_t;

typedef struct {
  u13_t pc;
  u12_t x;
  u12_t y;
  u4_t a;
  u4_t b;
  u5_t np;
  u8_t sp;
  u4_t flags;
  u32_t tick_counter;
  u32_t clk_timer_timestamp;
  u32_t prog_timer_timestamp;
  bool_t prog_timer_enabled;
  u8_t prog_timer_data;
  u8_t prog_timer_rld;
  u32_t call_depth;
  u4_t *memory;
  interrupt_t interrupts[6];  
 } cpu_state_t;

/* Pins (TODO: add other pins) */
typedef enum {
  PIN_K00 = 0x0,
  PIN_K01 = 0x1,
  PIN_K02 = 0x2,
  PIN_K03 = 0x3,
  PIN_K10 = 0X4,
  PIN_K11 = 0X5,
  PIN_K12 = 0X6,
  PIN_K13 = 0X7,
} pin_t;

typedef enum {
  PIN_STATE_LOW = 0,
  PIN_STATE_HIGH = 1,
} pin_state_t;

typedef enum {
  INT_PROG_TIMER_SLOT = 0,
  INT_SERIAL_SLOT = 1,
  INT_K10_K13_SLOT = 2,
  INT_K00_K03_SLOT = 3,
  INT_STOPWATCH_SLOT = 4,
  INT_CLOCK_TIMER_SLOT = 5,
  INT_SLOT_NUM,
} int_slot_t;


/*
typedef struct {
  u13_t *pc;
  u12_t *x;
  u12_t *y;
  u4_t *a;
  u4_t *b;
  u5_t *np;
  u8_t *sp;
  u4_t *flags;

  u32_t *tick_counter;
  u32_t *clk_timer_timestamp;
  u32_t *prog_timer_timestamp;
  bool_t *prog_timer_enabled;
  u8_t *prog_timer_data;
  u8_t *prog_timer_rld;

  u32_t *call_depth;

  interrupt_t *interrupts;

  u4_t *memory;
} state_t; */

#ifdef __cplusplus
 extern "C" {
#endif

void cpu_add_bp(breakpoint_t **list, u13_t addr);
void cpu_free_bp(breakpoint_t **list);

//void cpu_set_speed(u8_t speed);

void cpu_get_state(cpu_state_t *cpustate);
void cpu_set_state(cpu_state_t *cpustate);

u32_t cpu_get_depth(void);

void cpu_set_input_pin(pin_t pin, pin_state_t state);

void cpu_sync_ref_timestamp(void);

void cpu_refresh_hw(void);

void cpu_reset(void);

//u8_t cpu_get_max_number(void);

//bool_t cpu_init(breakpoint_t *breakpoints, u32_t freq);

bool_t cpu_init(u32_t freq);
void cpu_release(void);

int cpu_step(void);

#ifdef __cplusplus
}
#endif

#endif /* _CPU_H_ */