miniemu/cpu.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

#pragma once

typedef enum {
	Z_FLAG = 0x00, /* zero flag */
	C_FLAG = 0x01, /* carry flag */
	V_FLAG = 0x02 /* overflow flag */
} CCRFlag;

typedef struct Cpu {
	int PC; /* program counter */
	int AX; /* accumulator register */
	int BX; /* base register */
	int CX; /* counter register */
	int DX; /* data register */
	int SP; /* stack register holding address to top of stack */
	int CCR; /* condition code register */
	struct Memory *memory;
	int stopped;
	int error;
	int debug;
} Cpu;

void cpu_init( Cpu *cpu, struct Memory *memory );
void cpu_done( Cpu *cpu );
void cpu_reset( Cpu *cpu );
void cpu_step( Cpu *cpu );
int cpu_stopped( Cpu *cpu );
int cpu_has_errors( Cpu *cpu );
void cpu_debug( Cpu *cpu, int enable );
void cpu_print_dump( Cpu *cpu );