collapseos/emul/z80/emul.h
Virgil Dupras 23885dac33 emul: add TRS-80 emulator
Not complete yet, but has @KEY and @DSP, enough to get prompt.
2020-12-05 22:04:22 -05:00

51 lines
1.3 KiB
C

#pragma once
#include <stdint.h>
#include <stdbool.h>
#include "z80.h"
#define MAX_PCHOOK_COUNT 8
typedef byte (*IORD) ();
typedef void (*IOWR) (byte data);
typedef byte (*EXCH) (byte data);
typedef struct _Machine {
Z80Context cpu;
byte mem[0x10000];
// Set to non-zero to specify where ROM ends. Any memory write attempt
// below ramstart will trigger a warning.
ushort ramstart;
// The minimum value reached by SP at any point during execution.
ushort minsp;
// same principle for IX
ushort maxix;
// Array of 0x100 function pointers to IO read and write routines. Leave to
// NULL when IO port is unhandled.
IORD iord[0x100];
IOWR iowr[0x100];
// function to call when PC falls in one of the hooks
void (*pchookfunc) (struct _Machine *m);
// List of PC values at which we want to call pchookfunc
ushort pchooks[MAX_PCHOOK_COUNT];
byte pchooks_cnt;
} Machine;
typedef enum {
TRI_HIGH,
TRI_LOW,
TRI_HIGHZ
} Tristate;
Machine* emul_init(char *binpath, ushort binoffset);
void emul_deinit();
bool emul_step();
bool emul_steps(unsigned int steps);
void emul_loop();
void emul_trace(ushort addr);
void emul_memdump();
void emul_debugstr(char *s);
void emul_printdebug();
// use when a port is a NOOP, but it's not an error to access it.
byte iord_noop();
void iowr_noop(byte val);