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Steve2/src/cpu/6502.h

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//
// 6502.h
// 6502
//
// Created by Tamas Rudnai on 7/22/19.
// Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
//
// This file is part of Steve ][ -- The Apple ][ Emulator.
//
// Steve ][ 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 3 of the License, or
// (at your option) any later version.
//
// Steve ][ 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 Steve ][. If not, see <https://www.gnu.org/licenses/>.
//
#ifndef __6502_H__
#define __6502_H__
#include <stdint.h>
#include "common.h"
#include "woz.h"
typedef enum cpuMode_e {
cpuMode_normal = 0,
cpuMode_eco,
cpuMode_game,
} cpuMode_s;
typedef enum cpuState_e {
cpuState_unknown = 0,
cpuState_inited,
cpuState_running,
cpuState_halting,
cpuState_halted,
} cpuState_s;
extern volatile cpuMode_s cpuMode;
extern volatile cpuState_s cpuState;
extern const double default_MHz_6502;
extern const double iigs_MHz_6502;
extern const double iicplus_MHz_6502;
extern double MHz_6502;
extern unsigned long long clk_6502_per_frm;
extern unsigned long long clk_6502_per_frm_set;
extern unsigned long long clk_6502_per_frm_max;
extern unsigned long long clk_6502_per_frm_max_sound;
extern unsigned int clkfrm;
typedef enum {
NO_INT,
HALT,
IRQ,
NMI,
HARDRESET,
SOFTRESET,
} interrupt_t;
typedef struct debugLevel_s {
uint8_t trace : 1;
uint8_t step : 1;
uint8_t brk : 1;
uint8_t rts : 1;
uint8_t bra : 1;
uint8_t bra_true : 1;
uint8_t bra_false : 1;
uint8_t compile : 1;
} debugLevel_t;
typedef union flags_u {
struct {
uint8_t C:1; // Carry Flag
uint8_t Z:1; // Zero Flag
uint8_t I:1; // Interrupt Flag
uint8_t D:1; // Decimal Flag
uint8_t B:1; // B Flag
uint8_t res:1; // reserved -- should be always 1
uint8_t V:1; // Overflow Flag ???
uint8_t N:1; // Negative Flag
};
uint8_t SR;
} flags_t;
typedef struct m6502_s {
uint8_t A; // Accumulator
uint8_t X; // X index register
uint8_t Y; // Y index register
// union {
// uint8_t instr; // Instruction
// struct {
// uint8_t cc:2;
// uint8_t bbb:3;
// uint8_t aaa:3;
// };
// };
struct { // no bitfield faster processing
uint8_t C; // Carry Flag
uint8_t Z; // Zero Flag
uint8_t I; // Interrupt Flag
uint8_t D; // Decimal Flag
uint8_t B; // B Flag
uint8_t res; // reserved -- should be always 1
uint8_t V; // Overflow Flag ???
uint8_t N; // Negative Flag
};
uint16_t PC; // Program Counter
uint8_t SP; // Stack Pointer ( stack addr = 0x01 + sp )
// unsigned clk; // Clock Counter
uint64_t clktime;
uint64_t clklast;
debugLevel_t dbgLevel; // 0: No Debug, 1: Disassembly Only, 2: Run till BRK, 3: StepByStep
union {
unsigned int IF; // interrut flag
interrupt_t interrupt;
};
} m6502_t;
typedef struct disassembly_s {
uint64_t clk; // clock time
char addr[5]; // 4 digits + \0
char opcode[4 * 3 + 1]; // max 4 bytes * (2 digits + 1 space) + \0
char * pOpcode; // pointer for opcode string builder
char inst[6 + 1]; // 3 char (unknown instr? -- give it 6 chars) + \0
char oper[14 + 2 + 1 + 1 + 1]; // 4 digits + 2 brackets + 1 comma + 1 index + \0
char comment[256]; // to be able to add some comments
} disassembly_t;
// Memory Config
typedef struct MEMcfg_s {
unsigned RAM_16K : 1;
unsigned RAM_128K : 1;
unsigned RD_INT_RAM : 1;
unsigned WR_RAM : 1;
unsigned RAM_BANK_2 : 1;
unsigned AUX_BANK : 1;
unsigned txt_page_2 : 1; // 0: page 1 1: page 2 (aux video memory)
unsigned int_Cx_ROM : 1; // 0: Slot Cx ROM 1: Internal Cx ROM
unsigned slot_C3_ROM : 1; // 0: Internal ROM 1: Slot 3 ROM
unsigned is_80STORE : 1;
unsigned RD_AUX_MEM : 1;
unsigned WR_AUX_MEM : 1;
unsigned ALT_ZP : 1;
} MEMcfg_t;
typedef union videoMode_u {
struct {
uint8_t text : 1; // 0: graphics 1: text
uint8_t col80 : 1; // 0: 40 col 1: 80 col
uint8_t altChr : 1; // 0: normal 1: alternate character set
uint8_t mixed : 1; // 0: no mix 1: mixed graphics and text when in graphics mode
uint8_t hires : 1; // 0: loRes 1: hiRes
};
uint8_t mode;
} videoMode_t;
extern videoMode_t videoMode;
extern MEMcfg_t MEMcfg;
extern m6502_t m6502;
extern uint8_t * const AUX; // Pointer to the auxiliary memory so we can use this from Swift
extern uint8_t * const RAM;
extern uint8_t * const MEM; // Pointer to the Shadow Memory Map so we can use this from Swift//extern uint8_t * AUX_VID_RAM;
extern uint32_t * videoMemPtr;
extern double * pdl_valarr;
extern double * pdl_prevarr;
extern double * pdl_diffarr;
//extern void hires_Update(void);
extern double mips;
extern double mhz;
#define DEFAULT_FPS 30U
#define DEF_VIDEO_DIV 1U
#define DEF_SPKR_DIV 1U
#define GAME_FPS 600U
#define GAME_VIDEO_DIV 10U // 600 / 10 = 60 FPS
extern unsigned int video_fps_divider;
extern unsigned int fps;
extern void rom_loadFile( const char * bundlePath, const char * filename );
extern void tst6502(void);
extern void m6502_ColdReset( const char * bundlePath, const char * romFilePath );
extern void m6502_Run(void);
extern void kbdInput ( uint8_t code );
extern void kbdUp (void);
extern void setIO ( uint16_t ioaddr, uint8_t val );
extern void interrupt_IRQ(void);
extern void interrupt_NMI(void);
extern void hardReset(void);
extern void softReset(void);
extern void openLog(void);
extern void closeLog(void);
#endif /* __6502_H__ */
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