uxn/src/uxn.h

/*
Copyright (c) 2021 Devine Lu Linvega

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

typedef unsigned char Uint8;
typedef signed char Sint8;
typedef unsigned short Uint16;
typedef signed short Sint16;
typedef unsigned int Uint32;

#define PAGE_PROGRAM 0x0100
#define VISOR_DEV 0xfa00
#define VISOR_WST 0xfb00
#define VISOR_RST 0xfc00
#define PAGE_DEV 0xfd00
#define PAGE_WST 0xfe00
#define PAGE_RST 0xff00

/* clang-format off */

#define DEVPEEK16(o, x) { (o) = (d->dat[(x)] << 8) + d->dat[(x) + 1]; }
#define DEVPOKE16(x, y) { d->dat[(x)] = (y) >> 8; d->dat[(x) + 1] = (y); }
#define GETVECTOR(d) ((d)->dat[0] << 8 | (d)->dat[1])

/* clang-format on */

typedef struct {
	Uint8 ptr, dat[255];
} Stack;

typedef struct Device {
	struct Uxn *u;
	Uint8 dat[16], *mem;
	Uint8 (*dei)(struct Device *d, Uint8);
	void (*deo)(struct Device *d, Uint8);
} Device;

typedef struct Uxn {
	Uint8 *ram;
	Stack wst, rst;
	Device dev[16];
} Uxn;

int uxn_boot(Uxn *u, Uint8 *ram);
int uxn_eval(Uxn *u, Uint16 pc);
int uxn_halt(Uxn *u, Uint8 error, Uint16 addr);
int uxn_interrupt(Uxn *u);
Device *uxn_port(Uxn *u, Uint8 id, Uint8 (*deifn)(Device *, Uint8), void (*deofn)(Device *, Uint8));