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ewm/src/one.c

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// The MIT License (MIT)
//
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include <ctype.h>
#include <getopt.h>
#include <stdlib.h>
#include <SDL2/SDL.h>
#include "sdl.h"
#include "cpu.h"
#include "mem.h"
#include "pia.h"
#include "tty.h"
#include "one.h"
static void ewm_one_pia_callback(struct ewm_pia_t *pia, void *obj, uint8_t ddr, uint8_t v) {
struct ewm_one_t *one = (struct ewm_one_t*) obj;
if (one->model == EWM_ONE_MODEL_APPLE1) {
v &= 0x7f;
}
ewm_tty_write(one->tty, v);
}
static int ewm_one_init(struct ewm_one_t *one, int model, SDL_Renderer *renderer) {
memset(one, 0, sizeof(struct ewm_one_t));
one->model = model;
switch (model) {
case EWM_ONE_MODEL_APPLE1:
one->cpu = cpu_create(EWM_CPU_MODEL_6502);
cpu_add_ram(one->cpu, 0x0000, 8 * 1024 - 1);
cpu_add_rom_file(one->cpu, 0xff00, "rom/apple1.rom");
one->tty = ewm_tty_create(renderer);
one->pia = ewm_pia_create(one->cpu);
one->pia->callback = ewm_one_pia_callback;
one->pia->callback_obj = one;
break;
case EWM_ONE_MODEL_REPLICA1:
one->cpu = cpu_create(EWM_CPU_MODEL_65C02);
cpu_add_ram(one->cpu, 0x0000, 32 * 1024 - 1);
cpu_add_rom_file(one->cpu, 0xe000, "rom/krusader.rom");
one->tty = ewm_tty_create(renderer);
one->pia = ewm_pia_create(one->cpu);
one->pia->callback = ewm_one_pia_callback;
one->pia->callback_obj = one;
break;
}
return 0;
}
void ewm_one_destroy(struct ewm_one_t *one) {
// TODO
}
static void ewm_one_keydown(struct ewm_one_t *one, uint8_t key) {
ewm_pia_set_ina(one->pia, key | 0x80);
ewm_pia_set_irqa1(one->pia);
}
static bool ewm_one_poll_event(struct ewm_one_t *one, SDL_Window *window) {
SDL_Event event;
while (SDL_PollEvent(&event) != 0) {
switch (event.type) {
case SDL_QUIT:
return false;
case SDL_WINDOWEVENT:
one->tty->screen_dirty = true;
break;
case SDL_KEYDOWN:
if (event.key.keysym.mod & KMOD_CTRL) {
if (event.key.keysym.sym >= SDLK_a && event.key.keysym.sym <= SDLK_z) {
ewm_one_keydown(one, event.key.keysym.sym - SDLK_a);
} else {
// TODO Implement control codes 1b - 1f
}
} else if (event.key.keysym.mod & KMOD_GUI) {
switch (event.key.keysym.sym) {
case SDLK_ESCAPE:
cpu_reset(one->cpu);
break;
case SDLK_RETURN:
if (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN) {
SDL_SetWindowFullscreen(window, 0);
} else {
SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN);
}
break;
}
} else if (event.key.keysym.mod == KMOD_NONE) {
switch (event.key.keysym.sym) {
case SDLK_RETURN:
ewm_one_keydown(one, 0x0d); // CR
break;
case SDLK_TAB:
ewm_one_keydown(one, 0x09); // HT
case SDLK_DELETE:
ewm_one_keydown(one, 0x7f); // DEL
break;
case SDLK_LEFT:
ewm_one_keydown(one, 0x08); // BS
break;
case SDLK_RIGHT:
ewm_one_keydown(one, 0x15); // NAK
break;
case SDLK_UP:
ewm_one_keydown(one, 0x0b); // VT
break;
case SDLK_DOWN:
ewm_one_keydown(one, 0x0a); // LF
break;
case SDLK_ESCAPE:
ewm_one_keydown(one, 0x1b); // ESC
break;
}
}
break;
case SDL_TEXTINPUT:
if (strlen(event.text.text) == 1) {
ewm_one_keydown(one, toupper(event.text.text[0]));
}
break;
}
}
return true;
}
static bool ewm_one_step_cpu(struct ewm_one_t *one, int cycles) {
while (true) {
int ret = cpu_step(one->cpu);
if (ret < 0) {
// These only happen in strict mode
switch (ret) {
case EWM_CPU_ERR_UNIMPLEMENTED_INSTRUCTION:
fprintf(stderr, "CPU: Exited because of unimplemented instructions 0x%.2x at 0x%.4x\n",
mem_get_byte(one->cpu, one->cpu->state.pc), one->cpu->state.pc);
break;
case EWM_CPU_ERR_STACK_OVERFLOW:
fprintf(stderr, "CPU: Exited because of stack overflow at 0x%.4x\n", one->cpu->state.pc);
break;
case EWM_CPU_ERR_STACK_UNDERFLOW:
fprintf(stderr, "CPU: Exited because of stack underflow at 0x%.4x\n", one->cpu->state.pc);
break;
}
return false;
}
cycles -= ret;
if (cycles <= 0) {
break;
}
}
return true;
}
#define EWM_ONE_OPT_HELP (0)
#define EWM_ONE_OPT_MODEL (1)
#define EWM_ONE_OPT_MEMORY (2)
#define EWM_ONE_OPT_TRACE (3)
#define EWM_ONE_OPT_STRICT (4)
static struct option one_options[] = {
{ "help", no_argument, NULL, EWM_ONE_OPT_HELP },
{ "model", required_argument, NULL, EWM_ONE_OPT_MODEL },
{ "memory", required_argument, NULL, EWM_ONE_OPT_MEMORY },
{ "trace", optional_argument, NULL, EWM_ONE_OPT_TRACE },
{ "strict", no_argument, NULL, EWM_ONE_OPT_STRICT },
{ NULL, 0, NULL, 0 }
};
static void usage() {
fprintf(stderr, "Usage: ewm one [options]\n");
fprintf(stderr, " --model <model> model to emulate (default: apple1)\n");
fprintf(stderr, " --memory <region> add memory region (ram|rom:address:path)\n");
fprintf(stderr, " --trace <file> trace cpu to file\n");
fprintf(stderr, " --strict run emulator in strict mode\n");
fprintf(stderr, "\n");
fprintf(stderr, "Supported models:\n");
fprintf(stderr, " apple1 Classic Apple 1, 6502, 8KB RAM, Woz Monitor\n");
fprintf(stderr, " replica1 Replica 1, 65C02, 48KB RAM, KRUSADER\n");
}
int ewm_one_main(int argc, char **argv) {
// Parse Apple 1 specific options
int model = EWM_ONE_MODEL_DEFAULT;
struct ewm_memory_option_t *extra_memory = NULL;
char *trace_path = NULL;
bool strict = false;
int ch;
while ((ch = getopt_long_only(argc, argv, "", one_options, NULL)) != -1) {
switch (ch) {
case EWM_ONE_OPT_HELP: {
usage();
exit(0);
}
case EWM_ONE_OPT_MODEL: {
if (strcmp(optarg, "apple1") == 0) {
model = EWM_ONE_MODEL_APPLE1;
} else if (strcmp(optarg, "replica1") == 0) {
model = EWM_ONE_MODEL_REPLICA1;
} else {
fprintf(stderr, "Unknown --model specified\n");
exit(1);
}
break;
}
case EWM_ONE_OPT_MEMORY: {
struct ewm_memory_option_t *m = parse_memory_option(optarg);
if (m == NULL) {
exit(1);
}
m->next = extra_memory;
extra_memory = m;
break;
}
case EWM_ONE_OPT_TRACE: {
trace_path = optarg ? optarg : "/dev/stderr";
break;
}
case EWM_ONE_OPT_STRICT: {
strict = true;
break;
}
default: {
usage();
exit(1);
}
}
}
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_EVENTS) < 0) {
fprintf(stderr, "Failed to initialize SDL: %s\n", SDL_GetError());
return 1;
}
SDL_Window *window = SDL_CreateWindow("EWM v0.1 - Apple 1", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
280*3, 192*3, SDL_WINDOW_SHOWN);
if (window == NULL) {
fprintf(stderr, "Failed create window: %s\n", SDL_GetError());
return 1;
}
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
if (renderer == NULL) {
fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError());
return 1;
}
if (ewm_sdl_check_renderer(renderer) != 0) {
fprintf(stderr, "ewm: boo: unsupported renderer\n");
return 1;
}
SDL_RenderSetLogicalSize(renderer, 280, 192);
// Create the machine
struct ewm_one_t *one = ewm_one_create(model, renderer);
if (one == NULL) {
fprintf(stderr, "Failed to create ewm_one_t\n");
return 1;
}
// Add extra memory, if any
if (extra_memory != NULL) {
if (cpu_add_memory_from_options(one->cpu, extra_memory) != 0) {
exit(1);
}
}
cpu_strict(one->cpu, strict);
cpu_trace(one->cpu, trace_path);
cpu_reset(one->cpu);
// Main loop
SDL_StartTextInput();
uint32_t ticks = SDL_GetTicks();
uint32_t phase = 1;
while (true) {
if (!ewm_one_poll_event(one, window)) { // TODO Move window into one
break;
}
// This is very basic throttling that does bursts of CPU cycles.
if ((SDL_GetTicks() - ticks) >= (1000 / EWM_ONE_FPS)) {
if (!ewm_one_step_cpu(one, EWM_ONE_CPS / EWM_ONE_FPS)) {
break;
}
if (one->tty->screen_dirty || (phase == 0) || ((phase % (EWM_ONE_FPS / 4)) == 0)) {
SDL_SetRenderDrawColor(one->tty->renderer, 0, 0, 0, 255);
SDL_RenderClear(one->tty->renderer);
ewm_tty_refresh(one->tty, phase, EWM_ONE_FPS);
one->tty->screen_dirty = false;
SDL_Texture *texture = SDL_CreateTextureFromSurface(one->tty->renderer, one->tty->surface);
if (texture != NULL) {
SDL_RenderCopy(one->tty->renderer, texture, NULL, NULL);
SDL_DestroyTexture(texture);
}
SDL_RenderPresent(one->tty->renderer);
}
ticks = SDL_GetTicks();
phase += 1;
if (phase == EWM_ONE_FPS) {
phase = 0;
}
}
}
// Destroy SDL
SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
SDL_Quit();
return 0;
}
struct ewm_one_t *ewm_one_create(int model, SDL_Renderer *renderer) {
struct ewm_one_t *one = (struct ewm_one_t*) malloc(sizeof(struct ewm_one_t));
if (ewm_one_init(one, model, renderer) != 0) {
free(one);
one = NULL;
}
return one;
}
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