mirror of https://github.com/trudnai/Steve2.git
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
//
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// 6502.h
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// 6502
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//
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// Created by Tamas Rudnai on 7/22/19.
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// Copyright © 2019 GameAlloy. All rights reserved.
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//
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#ifndef __6502_H__
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#define __6502_H__
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#include <stdint.h>
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#include "../../src/util/common.h"
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extern unsigned long long MHz_6502;
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extern unsigned long long clk_6502_per_frm;
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extern unsigned long long clk_6502_per_frm_set;
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typedef enum {
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NO_INT,
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HLT,
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IRQ,
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NMI,
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HARDRESET,
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SOFTRESET,
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} interrupt_t;
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typedef struct debugLevel_s {
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uint8_t trace : 1;
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uint8_t step : 1;
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uint8_t brk : 1;
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uint8_t rts : 1;
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uint8_t bra : 1;
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uint8_t bra_true : 1;
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uint8_t bra_false : 1;
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uint8_t compile : 1;
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} debugLevel_t;
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typedef struct m6502_s {
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uint8_t A; // Accumulator
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uint8_t X; // X index register
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uint8_t Y; // Y index register
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// union {
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// uint8_t instr; // Instruction
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// struct {
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// uint8_t cc:2;
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// uint8_t bbb:3;
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// uint8_t aaa:3;
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// };
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// };
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union {
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uint8_t SR; // Status Register
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struct {
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uint8_t C:1; // Carry Flag
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uint8_t Z:1; // Zero Flag
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uint8_t I:1; // Interrupt Flag
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uint8_t D:1; // Decimal Flag
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uint8_t B:1; // B Flag
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uint8_t res:1; // reserved -- should be always 1
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uint8_t V:1; // Overflow Flag ???
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uint8_t N:1; // Negative Flag
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};
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};
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uint16_t PC; // Program Counter
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uint8_t SP; // Stack Pointer ( stack addr = 0x01 + sp )
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// unsigned clk; // Clock Counter
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uint64_t clktime;
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uint64_t clklast;
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debugLevel_t dbgLevel; // 0: No Debug, 1: Disassembly Only, 2: Run till BRK, 3: StepByStep
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union {
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unsigned int IF; // interrut flag
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interrupt_t interrupt;
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};
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} m6502_t;
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typedef struct disassembly_s {
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char addr[5]; // 4 digits + \0
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char opcode[4 * 3 + 1]; // max 4 bytes * (2 digits + 1 space) + \0
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char * pOpcode; // pointer for opcode string builder
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char inst[6 + 1]; // 3 char (unknown instr? -- give it 6 chars) + \0
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char oper[14 + 2 + 1 + 1 + 1]; // 4 digits + 2 brackets + 1 comma + 1 index + \0
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char comment[256]; // to be able to add some comments
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} disassembly_t;
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typedef union videoMode_u {
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struct {
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uint8_t text : 1; // 0: graphics 1: text
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uint8_t col80 : 1; // 0: 40 col 1: 80 col
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uint8_t altChr : 1; // 0: normal 1: alternate character set
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uint8_t mixed : 1; // 0: no mix 1: mixed graphics and text when in graphics mode
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uint8_t hires : 1; // 0: loRes 1: hiRes
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uint8_t page : 1; // 0: page 1 1: page 2 (aux video memory)
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};
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uint8_t mode;
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} videoMode_t;
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extern videoMode_t videoMode;
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extern m6502_t m6502;
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extern uint8_t * RAM;
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extern uint32_t * videoMemPtr;
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extern void hires_Update(void);
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extern double mips;
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extern double mhz;
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#define fps 30
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extern void rom_loadFile( const char * bundlePath, const char * filename );
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extern void woz_loadFile( const char * bundlePath, const char * filename );
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extern void tst6502(void);
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extern void m6502_ColdReset( const char * bundlePath, const char * romFilePath );
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extern void m6502_Run(void);
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extern void kbdInput ( uint8_t code );
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extern void setIO ( uint16_t ioaddr, uint8_t val );
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#endif /* __6502_H__ */
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