aiie/sdl/aiie.cpp
2021-01-10 23:52:58 -05:00

488 lines
12 KiB
C++

#include <stdio.h>
#include <unistd.h>
#include <curses.h>
#include <termios.h>
#include <pthread.h>
#include "applevm.h"
#include "sdl-display.h"
#include "sdl-keyboard.h"
#include "sdl-mouse.h"
#include "sdl-speaker.h"
#include "sdl-paddles.h"
#include "nix-filemanager.h"
#include "sdl-printer.h"
#include "appleui.h"
#include "bios.h"
#include "nix-prefs.h"
#include "debugger.h"
#include "globals.h"
#include "timeutil.h"
BIOS bios;
Debugger debugger;
#define NB_ENABLE 1
#define NB_DISABLE 0
int send_rst = 0;
char disk1name[256] = "\0";
char disk2name[256] = "\0";
volatile bool wantSuspend = false;
volatile bool wantResume = false;
volatile bool cpuDebuggerRunning = false;
volatile bool cpuClockInitialized = false;
void doDebugging();
void readPrefs();
void writePrefs();
void sigint_handler(int n)
{
// If we want control-C to reset the machine, then set this here...
send_rst = 1;
// ((AppleVM*)g_vm)->disk6->disk[0]->dumpInfo();
}
void nonblock(int state)
{
struct termios ttystate;
//get the terminal state
tcgetattr(STDIN_FILENO, &ttystate);
if (state==NB_ENABLE)
{
//turn off canonical mode
ttystate.c_lflag &= ~ICANON;
//minimum of number input read.
ttystate.c_cc[VMIN] = 1;
}
else if (state==NB_DISABLE)
{
//turn on canonical mode
ttystate.c_lflag |= ICANON;
}
//set the terminal attributes.
tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
}
uint8_t read(void *arg, uint16_t address)
{
// no action; this is a dummy function until we've finished initializing...
return 0x00;
}
void write(void *arg, uint16_t address, uint8_t v)
{
// no action; this is a dummy function until we've finished initializing...
}
static struct timespec runBIOS(struct timespec now)
{
static bool initialized = false;
static struct timespec startTime;
static struct timespec nextRuntime;
static uint64_t cycleCount = 0;
if (!initialized) {
do_gettime(&startTime);
do_gettime(&nextRuntime);
initialized = true;
}
timespec_add_us(&startTime, 100000*cycleCount, &nextRuntime); // FIXME: what's a good time here? 1/10 sec?
// Check if it's time to run - and if not, return how long it will
// be until we need to run
struct timespec diff = tsSubtract(nextRuntime, now);
if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
// The caller can decide to nanosleep(&diff, NULL)
return diff;
}
cycleCount++;
if (!bios.loop()) {
printf("BIOS loop has exited\n");
g_biosInterrupt = false; // that's all she wrote!
}
return diff;
}
static struct timespec runCPU(struct timespec now)
{
static struct timespec startTime;
static struct timespec nextInstructionTime;
if (!cpuClockInitialized) {
do_gettime(&startTime);
do_gettime(&nextInstructionTime);
cpuClockInitialized = true;
}
// Check for interrupt-like actions before running the CPU
if (wantSuspend) {
printf("CPU halted; suspending VM\n");
g_vm->Suspend("suspend.vm");
printf("... done; resuming CPU.\n");
wantSuspend = false;
}
if (wantResume) {
printf("CPU halted; resuming VM\n");
g_vm->Resume("suspend.vm");
printf("... done. resuming CPU.\n");
wantResume = false;
}
// Determine correct time for next CPU cycle
timespec_add_cycles(&startTime, g_cpu->cycles, &nextInstructionTime);
// Check if it's time to run - and if not, return how long it will be until we need to run
struct timespec diff = tsSubtract(nextInstructionTime, now);
if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
// The caller can decide to nanosleep(&diff, NULL)
return diff;
}
// Run the CPU
uint8_t executed = 0;
if (debugger.active()) {
// With the debugger running, we need to single-step through
// instructions.
executed = g_cpu->Run(1);
} else {
// Otherwise we can run a bunch of instructions at once to
// save on the overhead.
executed = g_cpu->Run(24);
}
// The paddles need to be triggered in real-time on the CPU
// clock. That happens from the VM's CPU maintenance poller.
((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
if (debugger.active()) {
debugger.step();
// FIXME need to reset starttime for this and g_cpu->cycles
}
if (send_rst) {
cpuDebuggerRunning = true;
printf("Sending reset\n");
g_cpu->Reset();
send_rst = 0;
}
return diff;
}
#define TARGET_FPS 30
struct timespec runDisplay(struct timespec now)
{
static bool initialized = false;
static struct timespec startTime;
static struct timespec nextRuntime;
static uint64_t cycleCount = 0;
if (!initialized) {
do_gettime(&startTime);
do_gettime(&nextRuntime);
initialized = true;
}
timespec_add_us(&startTime, (1000000/TARGET_FPS)*cycleCount, &nextRuntime); // 1000000 uS/S and 30fps target
// Check if it's time to run - and if not, return how long it will
// be until we need to run
struct timespec diff = tsSubtract(nextRuntime, now);
if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
// The caller can decide to nanosleep(&diff, NULL)
return diff;
}
cycleCount++;
if (!g_biosInterrupt) {
g_ui->blit();
g_vm->vmdisplay->lockDisplay();
if (g_vm->vmdisplay->needsRedraw()) {
AiieRect what = g_vm->vmdisplay->getDirtyRect();
g_vm->vmdisplay->didRedraw();
g_display->blit(what);
}
g_vm->vmdisplay->unlockDisplay();
// For SDL, I'm throwing the printer update in with the display update...
g_printer->update();
}
return diff;
}
void doDebugging()
{
char buf[25];
static time_t startAt = time(NULL);
static uint32_t loopCount = 0;
switch (g_debugMode) {
case D_SHOWFPS:
{
// display some FPS data
loopCount++;
uint32_t lenSecs = time(NULL) - startAt;
if (lenSecs >= 5) {
sprintf(buf, "%u FPS", loopCount / lenSecs);
g_display->debugMsg(buf);
startAt = time(NULL);
loopCount = 0;
}
}
break;
case D_SHOWMEMFREE:
// sprintf(buf, "%lu %u", FreeRamEstimate(), heapSize());
// g_display->debugMsg(buf);
break;
case D_SHOWPADDLES:
sprintf(buf, "%u %u", g_paddles->paddle0(), g_paddles->paddle1());
g_display->debugMsg(buf);
break;
case D_SHOWPC:
sprintf(buf, "%X", g_cpu->pc);
g_display->debugMsg(buf);
break;
case D_SHOWCYCLES:
sprintf(buf, "%llX", g_cpu->cycles);
g_display->debugMsg(buf);
break;
/*
case D_SHOWBATTERY:
// sprintf(buf, "BAT %d", analogRead(BATTERYPIN));
// g_display->debugMsg(buf);
break;
case D_SHOWTIME:
// sprintf(buf, "%.2d:%.2d:%.2d", hour(), minute(), second());
// g_display->debugMsg(buf);
break;*/
}
}
struct timespec runMaintenance(struct timespec now)
{
static bool initialized = false;
static struct timespec startTime;
static struct timespec nextRuntime;
static uint64_t cycleCount = 0;
if (!initialized) {
do_gettime(&startTime);
do_gettime(&nextRuntime);
initialized = true;
}
timespec_add_us(&startTime, 16667*cycleCount, &nextRuntime); // FIXME: what's a good time here? 60 Hz?
// Check if it's time to run - and if not, return how long it will
// be until we need to run
struct timespec diff = tsSubtract(nextRuntime, now);
if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
// The caller can decide to nanosleep(&diff, NULL)
return diff;
}
cycleCount++;
if (!g_biosInterrupt) {
// If the BIOS is running, then let it handle the keyboard directly
g_keyboard->maintainKeyboard();
g_mouse->maintainMouse();
}
doDebugging();
g_ui->drawPercentageUIElement(UIePowerPercentage, 100);
return diff;
}
void loop()
{
struct timespec now;
do_gettime(&now);
struct timespec shortest;
static bool wasBios = false; // so we can tell when it's done
if (g_biosInterrupt) {
shortest = runBIOS(now);
wasBios = true;
} else {
if (wasBios) {
// bios has just exited
writePrefs();
// if we turned off debugMode, make sure to clear the debugMsg
if (g_debugMode == D_NONE) {
g_display->debugMsg("");
}
// Force the display to redraw
g_display->redraw(); // Redraw the UI
((AppleDisplay*)(g_vm->vmdisplay))->modeChange(); // force a full re-draw and blit
cpuClockInitialized = false; // force it to reset so it doesn't fast-forward
wasBios = false;
}
}
if (!g_biosInterrupt) {
shortest = runCPU(now); // about 13% CPU utilization on my laptop
}
struct timespec diff;
diff = runDisplay(now); // about 47% CPU utilization on my laptop
if (tsCompare(&shortest, &diff) > 0)
shortest = diff;
diff = runMaintenance(now); // about 1% CPU utilization on my laptop
if (tsCompare(&shortest, &diff) > 0)
shortest = diff;
// If they all have time remaining then sleep until one is ready
if (shortest.tv_sec || shortest.tv_nsec) {
nanosleep(&shortest, NULL);
}
}
int main(int argc, char *argv[])
{
_init_darwin_shim();
SDL_Init(SDL_INIT_EVERYTHING);
g_speaker = new SDLSpeaker();
g_printer = new SDLPrinter();
// create the filemanager - the interface to the host file system.
g_filemanager = new NixFileManager();
g_display = new SDLDisplay();
// g_displayType = m_blackAndWhite;
g_ui = new AppleUI();
// paddles have to be created after g_display created the window
g_paddles = new SDLPaddles();
// Next create the virtual CPU. This needs the VM's MMU in order to run, but we don't have that yet.
g_cpu = new Cpu();
// Create the virtual machine. This may read from g_filemanager to get ROMs if necessary.
// (The actual Apple VM we've built has them compiled in, though.) It will create its virutal
// hardware (MMU, video driver, floppy, paddles, whatever).
g_vm = new AppleVM();
g_keyboard = new SDLKeyboard(g_vm->getKeyboard());
g_mouse = new SDLMouse();
// Now that the VM exists and it has created an MMU, we tell the CPU how to access memory through the MMU.
g_cpu->SetMMU(g_vm->getMMU());
// Now that all the virtual hardware is glued together, reset the VM
g_vm->Reset();
g_cpu->rst();
// g_display->blit();
g_display->redraw();
/* Load prefs & reset globals appropriately now */
readPrefs();
if (argc >= 2) {
printf("Inserting disk %s\n", argv[1]);
((AppleVM *)g_vm)->insertDisk(0, argv[1]);
strcpy(disk1name, argv[1]);
}
if (argc == 3) {
printf("Inserting disk %s\n", argv[2]);
((AppleVM *)g_vm)->insertDisk(1, argv[2]);
strcpy(disk2name, argv[2]);
}
// FIXME: fixed test disk...
// ((AppleVM *)g_vm)->insertHD(0, "hd32.img");
nonblock(NB_ENABLE);
signal(SIGINT, sigint_handler);
signal(SIGPIPE, SIG_IGN); // debugger might have a SIGPIPE happen if the remote end drops
g_speaker->begin();
printf("Starting loop\n");
while (1) {
loop();
}
}
void readPrefs()
{
NixPrefs np;
prefs_t p;
if (np.readPrefs(&p)) {
g_volume = p.volume;
g_displayType = p.displayType;
g_debugMode = p.debug;
g_speed = (p.speed * (1023000/2)); // steps of half normal speed
if (g_speed < (1023000/2))
g_speed = (1023000/2);
if (p.disk1[0]) {
((AppleVM *)g_vm)->insertDisk(0, p.disk1);
strcpy(disk1name, p.disk1);
}
if (p.disk2[0]) {
((AppleVM *)g_vm)->insertDisk(1, p.disk2);
strcpy(disk2name, p.disk2);
}
if (p.hd1[0]) {
((AppleVM *)g_vm)->insertHD(0, p.hd1);
}
if (p.hd2[0]) {
((AppleVM *)g_vm)->insertHD(1, p.hd2);
}
}
}
void writePrefs()
{
NixPrefs np;
prefs_t p;
p.magic = PREFSMAGIC;
p.prefsSize = sizeof(prefs_t);
p.version = PREFSVERSION;
p.volume = g_volume;
p.displayType = g_displayType;
p.debug = g_debugMode;
p.speed = g_speed / (1023000/2);
strcpy(p.disk1, ((AppleVM *)g_vm)->DiskName(0));
strcpy(p.disk2, ((AppleVM *)g_vm)->DiskName(1));
strcpy(p.hd1, ((AppleVM *)g_vm)->HDName(0));
strcpy(p.hd2, ((AppleVM *)g_vm)->HDName(1));
bool ret = np.writePrefs(&p);
printf("writePrefs returns %s\n", ret ? "true" : "false");
}