aiie/linuxfb/aiie.cpp
Jorj Bauer 99d0c8e72c Squashed commit of
* New BIOS interface
 * New linux framebuffer version
 * Unified linuxfb and SDL with Teensy
 * Abstracted VM RAM
 * Fixed disk image corruption due to bad cache handling
 * Variable CPU speed support
2018-02-07 10:28:40 -05:00

541 lines
14 KiB
C++

#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <pthread.h>
#include <sys/vt.h>
#include <sys/ioctl.h>
#include <signal.h>
#include "applevm.h"
#include "fb-display.h"
#include "linux-keyboard.h"
#include "linux-speaker.h"
#include "fb-paddles.h"
#include "nix-filemanager.h"
#include "linux-printer.h"
#include "appleui.h"
#include "bios.h"
#include "globals.h"
#include "timeutil.h"
//#define SHOWFPS
//#define SHOWPC
//#define DEBUGCPU
//#define SHOWMEMPAGE
BIOS bios;
static struct timespec nextInstructionTime, startTime;
#define NB_ENABLE 1
#define NB_DISABLE 0
int send_rst = 0;
pthread_t cpuThreadID;
char disk1name[256] = "\0";
char disk2name[256] = "\0";
volatile bool wantSuspend = false;
volatile bool wantResume = false;
void doDebugging();
void sigint_handler(int n)
{
send_rst = 1;
}
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 void *cpu_thread(void *dummyptr) {
struct timespec currentTime;
struct timespec nextCycleTime;
uint32_t nextSpeakerCycle = 0;
#if 0
int policy;
struct sched_param param;
pthread_getschedparam(pthread_self(), &policy, &param);
param.sched_priority = sched_get_priority_max(policy);
pthread_setschedparam(pthread_self(), policy, &param);
#endif
_init_darwin_shim();
do_gettime(&startTime);
printf("Start time: %lu,%lu\n", startTime.tv_sec, startTime.tv_nsec);
do_gettime(&nextInstructionTime);
printf("free-running\n");
while (1) {
if (g_biosInterrupt) {
printf("BIOS blocking\n");
while (g_biosInterrupt) {
usleep(100);
}
printf("BIOS block complete\n");
}
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;
}
do_gettime(&currentTime);
/* The speaker is our priority. The CPU runs in batches anyway,
sometimes a little behind and sometimes a little ahead; but the
speaker has to be right on time. */
struct timespec diff;
#if 0
// Wait until nextSpeakerCycle
timespec_add_cycles(&startTime, nextSpeakerCycle, &nextCycleTime);
diff = tsSubtract(nextCycleTime, currentTime);
if (diff.tv_sec >= 0 || diff.tv_nsec >= 0) {
nanosleep(&diff, NULL);
}
// Speaker runs 48 cycles behind the CPU (an arbitrary number)
if (nextSpeakerCycle >= 48) {
timespec_add_cycles(&startTime, nextSpeakerCycle-48, &nextCycleTime);
uint64_t microseconds = nextCycleTime.tv_sec * 1000000 +
(double)nextCycleTime.tv_nsec / 1000.0;
g_speaker->maintainSpeaker(nextSpeakerCycle-48, microseconds);
}
// Bump speaker cycle for next go-round
nextSpeakerCycle++;
#endif
/* Next up is the CPU. */
// tsSubtract doesn't return negatives; it bounds at 0.
diff = tsSubtract(nextInstructionTime, currentTime);
uint8_t executed = 0;
if (diff.tv_sec == 0 && diff.tv_nsec == 0) {
#ifdef DEBUGCPU
executed = g_cpu->Run(1);
#else
executed = g_cpu->Run(24);
#endif
// calculate the real time that we should be at now, and schedule
// that as our next instruction time
timespec_add_cycles(&startTime, g_cpu->cycles, &nextInstructionTime);
// 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);
#ifdef DEBUGCPU
{
uint8_t p = g_cpu->flags;
printf("OP: $%02x A: %02x X: %02x Y: %02x PC: $%04x SP: %02x Flags: %c%cx%c%c%c%c%c\n",
g_vm->getMMU()->read(g_cpu->pc),
g_cpu->a, g_cpu->x, g_cpu->y, g_cpu->pc, g_cpu->sp,
p & (1<<7) ? 'N':' ',
p & (1<<6) ? 'V':' ',
p & (1<<4) ? 'B':' ',
p & (1<<3) ? 'D':' ',
p & (1<<2) ? 'I':' ',
p & (1<<1) ? 'Z':' ',
p & (1<<0) ? 'C':' '
);
}
#endif
if (send_rst) {
#if 0
printf("Scheduling suspend request...\n");
wantSuspend = true;
#endif
#if 0
printf("Scheduling resume resume request...\n");
wantResume = true;
#endif
#if 0
printf("Sending reset\n");
g_cpu->Reset();
// testing startup keyboard presses - perform Apple //e self-test
//g_vm->getKeyboard()->keyDepressed(RA);
//g_vm->Reset();
//g_cpu->Reset();
//((AppleVM *)g_vm)->insertDisk(0, "disks/DIAGS.DSK");
#endif
#if 0
// Swap disks
if (disk1name[0] && disk2name[0]) {
printf("Swapping disks\n");
printf("Inserting disk %s in drive 1\n", disk2name);
((AppleVM *)g_vm)->insertDisk(0, disk2name);
printf("Inserting disk %s in drive 2\n", disk1name);
((AppleVM *)g_vm)->insertDisk(1, disk1name);
}
#endif
#if 0
MMU *mmu = g_vm->getMMU();
printf("PC: 0x%X\n", g_cpu->pc);
for (int i=g_cpu->pc; i<g_cpu->pc + 0x100; i++) {
printf("0x%X ", mmu->read(i));
}
printf("\n");
printf("Dropping to monitor\n");
// drop directly to monitor.
g_cpu->pc = 0xff69; // "call -151"
mmu->read(0xC054); // make sure we're in page 1
mmu->read(0xC056); // and that hires is off
mmu->read(0xC051); // and text mode is on
mmu->read(0xC08A); // and we have proper rom in place
mmu->read(0xc008); // main zero-page
mmu->read(0xc006); // rom from cards
mmu->write(0xc002 + mmu->read(0xc014)? 1 : 0, 0xff); // make sure aux ram read and write match
mmu->write(0x20, 0); // text window
mmu->write(0x21, 40);
mmu->write(0x22, 0);
mmu->write(0x23, 24);
mmu->write(0x33, '>');
mmu->write(0x48, 0); // from 0xfb2f: part of text init
#endif
send_rst = 0;
}
}
}
}
int main(int argc, char *argv[])
{
int fd;
struct vt_stat vts;
int newVT;
int initialVT;
if ((fd=open("/dev/console", O_WRONLY)) < 0) {
perror("opening /dev/console");
exit(1);
}
ioctl(fd, VT_GETSTATE, &vts);
initialVT = vts.v_active; // find what VT we were on originally
ioctl(fd, VT_OPENQRY, &newVT);
if (newVT == -1) {
printf("No VTs available");
exit(1);
}
// Switch to new VT
ioctl(fd, VT_ACTIVATE, newVT);
ioctl(0, VT_WAITACTIVE, newVT);
printf("Now on VT %d\n", newVT);
// If we want stdout/stderr to move with us to the new VT, do this sorta thing, but to the right TTY
// freopen("/dev/tty2", "w", stdout);
// freopen("/dev/tty2", "w", stderr);
// Turn off cursor
system("echo 0 > /sys/class/graphics/fbcon/cursor_blink");
#if 0
// Timing consistency check
sleep(2); // kinda random, hopefully sloppy? - to make startTime != 0,0
printf("starting time consistency check\n");
do_gettime(&startTime);
for (int i=0; i<10000000; i++) {
// Calculate the time delta from startTime to cycle # i
timespec_add_cycles(&startTime, i, &nextInstructionTime);
// Recalculate the time difference between nextInstructionTime and startTime
struct timespec runtime = tsSubtract(nextInstructionTime, startTime);
// See if it's the same as cycles_since_time
double guesstimate = cycles_since_time(&runtime);
printf("cycle %d guesstimate %f\n", i, guesstimate);
if (guesstimate != i) {
printf("FAILED: cycle %d has guesstimate %f\n", i, guesstimate);
exit(1);
}
}
printf("All ok\n");
exit(1);
#endif
g_speaker = new LinuxSpeaker();
g_printer = new LinuxPrinter();
// create the filemanager - the interface to the host file system.
g_filemanager = new NixFileManager();
g_display = new FBDisplay();
// g_displayType = m_blackAndWhite;
g_ui = new AppleUI();
// paddles have to be created after g_display created the window
g_paddles = new FBPaddles();
// 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 LinuxKeyboard(g_vm->getKeyboard());
// 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->redraw();
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);
printf("creating CPU thread\n");
if (!pthread_create(&cpuThreadID, NULL, &cpu_thread, (void *)NULL)) {
printf("thread created\n");
// pthread_setschedparam(cpuThreadID, SCHED_RR, PTHREAD_MAX_PRIORITY);
}
while (1) {
if (g_biosInterrupt) {
printf("Invoking BIOS\n");
if (bios.runUntilDone()) {
// if it returned true, we have something to store
// persistently in EEPROM.
// writePrefs();
}
printf("BIOS done\n");
// if we turned off debugMode, make sure to clear the debugMsg
if (g_debugMode == D_NONE) {
g_display->debugMsg("");
}
g_biosInterrupt = false;
// clear the CPU next-step counters
g_cpu->cycles = 0;
do_gettime(&startTime);
do_gettime(&nextInstructionTime);
// Drain the speaker queue (FIXME: a little hacky)
g_speaker->maintainSpeaker(-1, -1);
/* FIXME
// Force the display to redraw
((AppleDisplay*)(g_vm->vmdisplay))->modeChange();
*/
// Poll the keyboard before we start, so we can do selftest on startup
g_keyboard->maintainKeyboard();
}
static uint32_t usleepcycles = 16384; // step-down for display drawing. Dynamically updated based on FPS calculations.
// fill disk buffer when needed
((AppleVM*)g_vm)->disk6->fillDiskBuffer();
// Make this a little friendlier, and the expense of some framerate?
// usleep(10000);
if (g_vm->vmdisplay->needsRedraw()) {
AiieRect what = g_vm->vmdisplay->getDirtyRect();
// make sure to clear the flag before drawing; there's no lock
// on didRedraw, so the other thread might update it
g_vm->vmdisplay->didRedraw();
g_display->blit(what);
}
g_printer->update();
g_keyboard->maintainKeyboard();
g_ui->drawPercentageUIElement(UIePowerPercentage, 100);
doDebugging();
// calculate FPS & dynamically step up/down as necessary
static time_t startAt = time(NULL);
static uint32_t loopCount = 0;
loopCount++;
uint32_t lenSecs = time(NULL) - startAt;
if (lenSecs >= 5) {
float fps = loopCount / lenSecs;
#ifdef SHOWFPS
char buf[25];
sprintf(buf, "%f FPS [delay %u]", fps, usleepcycles);
g_display->debugMsg(buf);
#endif
if (fps > 60) {
usleepcycles *= 2;
} else if (fps < 40) {
usleepcycles /= 2;
}
// reset the counter & we'll adjust again in 5 seconds
loopCount = 0;
startAt = time(NULL);
}
if (usleepcycles >= 2) {
usleep(usleepcycles);
}
#ifdef SHOWPC
{
char buf[25];
sprintf(buf, "%X", g_cpu->pc);
g_display->debugMsg(buf);
}
#endif
#ifdef SHOWMEMPAGE
{
char buf[40];
sprintf(buf, "AUX %c/%c BNK %d BSR %c/%c ZP %c 80 %c INT %c",
g_vm->auxRamRead?'R':'_',
g_vm->auxRamWrite?'W':'_',
g_vm->bank1,
g_vm->readbsr ? 'R':'_',
g_vm->writebsr ? 'W':'_',
g_vm->altzp ? 'Y':'_',
g_vm->_80store ? 'Y' : '_',
g_vm->intcxrom ? 'Y' : '_');
g_display->debugMsg(buf);
}
#endif
}
}
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, "%X", 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;*/
}
}