mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-08-14 19:29:00 +00:00
488 lines
12 KiB
C++
488 lines
12 KiB
C++
#include <stdio.h>
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#include <unistd.h>
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#include <curses.h>
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#include <termios.h>
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#include <pthread.h>
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#include "applevm.h"
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#include "sdl-display.h"
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#include "sdl-keyboard.h"
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#include "sdl-mouse.h"
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#include "sdl-speaker.h"
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#include "sdl-paddles.h"
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#include "nix-filemanager.h"
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#include "sdl-printer.h"
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#include "appleui.h"
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#include "bios.h"
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#include "nix-prefs.h"
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#include "debugger.h"
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#include "globals.h"
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#include "timeutil.h"
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BIOS bios;
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Debugger debugger;
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#define NB_ENABLE 1
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#define NB_DISABLE 0
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int send_rst = 0;
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char disk1name[256] = "\0";
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char disk2name[256] = "\0";
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volatile bool wantSuspend = false;
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volatile bool wantResume = false;
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volatile bool cpuDebuggerRunning = false;
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volatile bool cpuClockInitialized = false;
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void doDebugging();
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void readPrefs();
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void writePrefs();
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void sigint_handler(int n)
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{
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// If we want control-C to reset the machine, then set this here...
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send_rst = 1;
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// ((AppleVM*)g_vm)->disk6->disk[0]->dumpInfo();
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}
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void nonblock(int state)
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{
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struct termios ttystate;
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//get the terminal state
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tcgetattr(STDIN_FILENO, &ttystate);
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if (state==NB_ENABLE)
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{
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//turn off canonical mode
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ttystate.c_lflag &= ~ICANON;
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//minimum of number input read.
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ttystate.c_cc[VMIN] = 1;
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}
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else if (state==NB_DISABLE)
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{
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//turn on canonical mode
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ttystate.c_lflag |= ICANON;
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}
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//set the terminal attributes.
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tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
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}
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uint8_t read(void *arg, uint16_t address)
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{
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// no action; this is a dummy function until we've finished initializing...
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return 0x00;
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}
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void write(void *arg, uint16_t address, uint8_t v)
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{
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// no action; this is a dummy function until we've finished initializing...
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}
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static struct timespec runBIOS(struct timespec now)
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{
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static bool initialized = false;
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static struct timespec startTime;
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static struct timespec nextRuntime;
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static uint64_t cycleCount = 0;
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if (!initialized) {
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do_gettime(&startTime);
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do_gettime(&nextRuntime);
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initialized = true;
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}
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timespec_add_us(&startTime, 100000*cycleCount, &nextRuntime); // FIXME: what's a good time here? 1/10 sec?
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// Check if it's time to run - and if not, return how long it will
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// be until we need to run
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struct timespec diff = tsSubtract(nextRuntime, now);
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if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
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// The caller can decide to nanosleep(&diff, NULL)
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return diff;
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}
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cycleCount++;
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if (!bios.loop()) {
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printf("BIOS loop has exited\n");
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g_biosInterrupt = false; // that's all she wrote!
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}
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return diff;
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}
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static struct timespec runCPU(struct timespec now)
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{
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static struct timespec startTime;
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static struct timespec nextInstructionTime;
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if (!cpuClockInitialized) {
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do_gettime(&startTime);
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do_gettime(&nextInstructionTime);
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cpuClockInitialized = true;
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}
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// Check for interrupt-like actions before running the CPU
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if (wantSuspend) {
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printf("CPU halted; suspending VM\n");
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g_vm->Suspend("suspend.vm");
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printf("... done; resuming CPU.\n");
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wantSuspend = false;
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}
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if (wantResume) {
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printf("CPU halted; resuming VM\n");
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g_vm->Resume("suspend.vm");
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printf("... done. resuming CPU.\n");
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wantResume = false;
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}
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// Determine correct time for next CPU cycle
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timespec_add_cycles(&startTime, g_cpu->cycles, &nextInstructionTime);
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// Check if it's time to run - and if not, return how long it will be until we need to run
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struct timespec diff = tsSubtract(nextInstructionTime, now);
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if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
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// The caller can decide to nanosleep(&diff, NULL)
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return diff;
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}
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// Run the CPU
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uint8_t executed = 0;
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if (debugger.active()) {
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// With the debugger running, we need to single-step through
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// instructions.
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executed = g_cpu->Run(1);
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} else {
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// Otherwise we can run a bunch of instructions at once to
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// save on the overhead.
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executed = g_cpu->Run(24);
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}
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// The paddles need to be triggered in real-time on the CPU
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// clock. That happens from the VM's CPU maintenance poller.
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((AppleVM *)g_vm)->cpuMaintenance(g_cpu->cycles);
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if (debugger.active()) {
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debugger.step();
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// FIXME need to reset starttime for this and g_cpu->cycles
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}
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if (send_rst) {
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cpuDebuggerRunning = true;
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printf("Sending reset\n");
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g_cpu->Reset();
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send_rst = 0;
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}
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return diff;
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}
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#define TARGET_FPS 30
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struct timespec runDisplay(struct timespec now)
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{
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static bool initialized = false;
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static struct timespec startTime;
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static struct timespec nextRuntime;
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static uint64_t cycleCount = 0;
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if (!initialized) {
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do_gettime(&startTime);
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do_gettime(&nextRuntime);
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initialized = true;
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}
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timespec_add_us(&startTime, (1000000/TARGET_FPS)*cycleCount, &nextRuntime); // 1000000 uS/S and 30fps target
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// Check if it's time to run - and if not, return how long it will
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// be until we need to run
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struct timespec diff = tsSubtract(nextRuntime, now);
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if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
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// The caller can decide to nanosleep(&diff, NULL)
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return diff;
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}
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cycleCount++;
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if (!g_biosInterrupt) {
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g_ui->blit();
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g_vm->vmdisplay->lockDisplay();
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if (g_vm->vmdisplay->needsRedraw()) {
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AiieRect what = g_vm->vmdisplay->getDirtyRect();
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g_vm->vmdisplay->didRedraw();
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g_display->blit(what);
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}
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g_vm->vmdisplay->unlockDisplay();
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// For SDL, I'm throwing the printer update in with the display update...
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g_printer->update();
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}
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return diff;
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}
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void doDebugging()
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{
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char buf[25];
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static time_t startAt = time(NULL);
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static uint32_t loopCount = 0;
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switch (g_debugMode) {
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case D_SHOWFPS:
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{
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// display some FPS data
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loopCount++;
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uint32_t lenSecs = time(NULL) - startAt;
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if (lenSecs >= 5) {
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sprintf(buf, "%u FPS", loopCount / lenSecs);
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g_display->debugMsg(buf);
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startAt = time(NULL);
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loopCount = 0;
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}
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}
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break;
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case D_SHOWMEMFREE:
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// sprintf(buf, "%lu %u", FreeRamEstimate(), heapSize());
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// g_display->debugMsg(buf);
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break;
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case D_SHOWPADDLES:
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sprintf(buf, "%u %u", g_paddles->paddle0(), g_paddles->paddle1());
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g_display->debugMsg(buf);
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break;
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case D_SHOWPC:
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sprintf(buf, "%X", g_cpu->pc);
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g_display->debugMsg(buf);
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break;
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case D_SHOWCYCLES:
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sprintf(buf, "%llX", g_cpu->cycles);
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g_display->debugMsg(buf);
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break;
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/*
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case D_SHOWBATTERY:
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// sprintf(buf, "BAT %d", analogRead(BATTERYPIN));
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// g_display->debugMsg(buf);
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break;
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case D_SHOWTIME:
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// sprintf(buf, "%.2d:%.2d:%.2d", hour(), minute(), second());
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// g_display->debugMsg(buf);
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break;*/
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}
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}
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struct timespec runMaintenance(struct timespec now)
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{
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static bool initialized = false;
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static struct timespec startTime;
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static struct timespec nextRuntime;
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static uint64_t cycleCount = 0;
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if (!initialized) {
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do_gettime(&startTime);
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do_gettime(&nextRuntime);
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initialized = true;
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}
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timespec_add_us(&startTime, 16667*cycleCount, &nextRuntime); // FIXME: what's a good time here? 60 Hz?
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// Check if it's time to run - and if not, return how long it will
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// be until we need to run
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struct timespec diff = tsSubtract(nextRuntime, now);
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if (diff.tv_sec > 0 || diff.tv_nsec > 0) {
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// The caller can decide to nanosleep(&diff, NULL)
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return diff;
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}
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cycleCount++;
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if (!g_biosInterrupt) {
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// If the BIOS is running, then let it handle the keyboard directly
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g_keyboard->maintainKeyboard();
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g_mouse->maintainMouse();
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}
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doDebugging();
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g_ui->drawPercentageUIElement(UIePowerPercentage, 100);
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return diff;
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}
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void loop()
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{
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struct timespec now;
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do_gettime(&now);
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struct timespec shortest;
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static bool wasBios = false; // so we can tell when it's done
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if (g_biosInterrupt) {
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shortest = runBIOS(now);
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wasBios = true;
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} else {
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if (wasBios) {
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// bios has just exited
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writePrefs();
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// if we turned off debugMode, make sure to clear the debugMsg
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if (g_debugMode == D_NONE) {
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g_display->debugMsg("");
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}
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// Force the display to redraw
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g_display->redraw(); // Redraw the UI
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((AppleDisplay*)(g_vm->vmdisplay))->modeChange(); // force a full re-draw and blit
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cpuClockInitialized = false; // force it to reset so it doesn't fast-forward
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wasBios = false;
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}
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}
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if (!g_biosInterrupt) {
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shortest = runCPU(now); // about 13% CPU utilization on my laptop
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}
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struct timespec diff;
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diff = runDisplay(now); // about 47% CPU utilization on my laptop
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if (tsCompare(&shortest, &diff) > 0)
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shortest = diff;
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diff = runMaintenance(now); // about 1% CPU utilization on my laptop
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if (tsCompare(&shortest, &diff) > 0)
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shortest = diff;
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// If they all have time remaining then sleep until one is ready
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if (shortest.tv_sec || shortest.tv_nsec) {
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nanosleep(&shortest, NULL);
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}
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}
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int main(int argc, char *argv[])
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{
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_init_darwin_shim();
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SDL_Init(SDL_INIT_EVERYTHING);
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g_speaker = new SDLSpeaker();
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g_printer = new SDLPrinter();
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// create the filemanager - the interface to the host file system.
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g_filemanager = new NixFileManager();
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g_display = new SDLDisplay();
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// g_displayType = m_blackAndWhite;
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g_ui = new AppleUI();
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// paddles have to be created after g_display created the window
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g_paddles = new SDLPaddles();
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// Next create the virtual CPU. This needs the VM's MMU in order to run, but we don't have that yet.
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g_cpu = new Cpu();
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// Create the virtual machine. This may read from g_filemanager to get ROMs if necessary.
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// (The actual Apple VM we've built has them compiled in, though.) It will create its virutal
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// hardware (MMU, video driver, floppy, paddles, whatever).
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g_vm = new AppleVM();
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g_keyboard = new SDLKeyboard(g_vm->getKeyboard());
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g_mouse = new SDLMouse();
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// Now that the VM exists and it has created an MMU, we tell the CPU how to access memory through the MMU.
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g_cpu->SetMMU(g_vm->getMMU());
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// Now that all the virtual hardware is glued together, reset the VM
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g_vm->Reset();
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g_cpu->rst();
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// g_display->blit();
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g_display->redraw();
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/* Load prefs & reset globals appropriately now */
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readPrefs();
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if (argc >= 2) {
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printf("Inserting disk %s\n", argv[1]);
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((AppleVM *)g_vm)->insertDisk(0, argv[1]);
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strcpy(disk1name, argv[1]);
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}
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if (argc == 3) {
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printf("Inserting disk %s\n", argv[2]);
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((AppleVM *)g_vm)->insertDisk(1, argv[2]);
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strcpy(disk2name, argv[2]);
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}
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// FIXME: fixed test disk...
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// ((AppleVM *)g_vm)->insertHD(0, "hd32.img");
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nonblock(NB_ENABLE);
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signal(SIGINT, sigint_handler);
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signal(SIGPIPE, SIG_IGN); // debugger might have a SIGPIPE happen if the remote end drops
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g_speaker->begin();
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printf("Starting loop\n");
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while (1) {
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loop();
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}
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}
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void readPrefs()
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{
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NixPrefs np;
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prefs_t p;
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if (np.readPrefs(&p)) {
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g_volume = p.volume;
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g_displayType = p.displayType;
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g_debugMode = p.debug;
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g_speed = (p.speed * (1023000/2)); // steps of half normal speed
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if (g_speed < (1023000/2))
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g_speed = (1023000/2);
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if (p.disk1[0]) {
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((AppleVM *)g_vm)->insertDisk(0, p.disk1);
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strcpy(disk1name, p.disk1);
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}
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if (p.disk2[0]) {
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((AppleVM *)g_vm)->insertDisk(1, p.disk2);
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strcpy(disk2name, p.disk2);
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}
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if (p.hd1[0]) {
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((AppleVM *)g_vm)->insertHD(0, p.hd1);
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}
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if (p.hd2[0]) {
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((AppleVM *)g_vm)->insertHD(1, p.hd2);
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}
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}
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}
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void writePrefs()
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{
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NixPrefs np;
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prefs_t p;
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p.magic = PREFSMAGIC;
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p.prefsSize = sizeof(prefs_t);
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p.version = PREFSVERSION;
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p.volume = g_volume;
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p.displayType = g_displayType;
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p.debug = g_debugMode;
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p.speed = g_speed / (1023000/2);
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strcpy(p.disk1, ((AppleVM *)g_vm)->DiskName(0));
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strcpy(p.disk2, ((AppleVM *)g_vm)->DiskName(1));
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strcpy(p.hd1, ((AppleVM *)g_vm)->HDName(0));
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strcpy(p.hd2, ((AppleVM *)g_vm)->HDName(1));
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bool ret = np.writePrefs(&p);
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printf("writePrefs returns %s\n", ret ? "true" : "false");
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}
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