317 lines
6.1 KiB
C++
317 lines
6.1 KiB
C++
// (C) 2018-2022 by Folkert van Heusden
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// Released under Apache License v2.0
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#include <atomic>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "error.h"
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#include "console_ncurses.h"
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#include "console_posix.h"
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#include "cpu.h"
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#include "gen.h"
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#include "memory.h"
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#include "terminal.h"
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#include "tests.h"
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#include "tty.h"
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#include "utils.h"
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bool withUI { false };
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uint32_t event { 0 };
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std::atomic_bool terminate { false };
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void loadbin(bus *const b, uint16_t base, const char *const file)
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{
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FILE *fh = fopen(file, "rb");
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while(!feof(fh))
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b -> writeByte(base++, fgetc(fh));
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fclose(fh);
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}
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void setBootLoader(bus *const b)
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{
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cpu *const c = b -> getCpu();
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const uint16_t offset = 01000;
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constexpr uint16_t bootrom[] = {
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0012700,
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0177406,
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0012710,
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0177400,
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0012740,
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0000005,
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0105710,
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0100376,
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0005007
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};
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FILE *fh = fopen("boot.dat", "wb");
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for(size_t i=0; i<sizeof bootrom / 2; i++) {
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b -> writeWord(offset + i * 2, bootrom[i]);
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fputc(bootrom[i] & 255, fh);
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fputc(bootrom[i] >> 8, fh);
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}
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fclose(fh);
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c -> setRegister(7, offset);
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}
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uint16_t loadTape(bus *const b, const char *const file)
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{
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FILE *fh = fopen(file, "rb");
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if (!fh) {
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fprintf(stderr, "Cannot open %s\n", file);
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return -1;
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}
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uint16_t start = 0, end = 0;
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for(;!feof(fh);) {
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uint8_t buffer[6];
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if (fread(buffer, 1, 6, fh) != 6)
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break;
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int count = (buffer[3] << 8) | buffer[2];
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int p = (buffer[5] << 8) | buffer[4];
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uint8_t csum = 0;
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for(int i=2; i<6; i++)
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csum += buffer[i];
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if (count == 6) { // eg no data
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if (p != 1) {
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fprintf(stderr, "Setting start address to %o\n", p);
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start = p;
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}
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}
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fprintf(stderr, "%ld] reading %d (dec) bytes to %o (oct)\n", ftell(fh), count - 6, p);
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for(int i=0; i<count - 6; i++) {
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if (feof(fh)) {
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fprintf(stderr, "short read\n");
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break;
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}
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uint8_t c = fgetc(fh);
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csum += c;
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b -> writeByte(p++, c);
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if (p > end)
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end = p;
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}
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int fcs = fgetc(fh);
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csum += fcs;
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if (csum != 255)
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fprintf(stderr, "checksum error %d\n", csum);
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}
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fclose(fh);
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fh = fopen("test.dat", "wb");
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for(int i=0; i<end; i++)
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fputc(b -> readByte(i), fh);
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fclose(fh);
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return start;
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}
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volatile bool sw = false;
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void sw_handler(int s)
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{
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if (s == SIGWINCH)
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sw = true;
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else {
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fprintf(stderr, "Terminating...\n");
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terminate = true;
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}
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}
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void help()
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{
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printf("-h this help\n");
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printf("-m mode \"tc\": run testcases\n");
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printf("-T t.bin load file as a binary tape file (like simh \"load\" command)\n");
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printf("-R d.rk load file as a RK05 disk device\n");
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printf("-p 123 set CPU start pointer to decimal(!) value\n");
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printf("-L f.bin load file into memory at address given by -p (and run it)\n");
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printf("-n ncurses UI\n");
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printf("-d enable disassemble\n");
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}
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int main(int argc, char *argv[])
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{
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//setlocale(LC_ALL, "");
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fprintf(stderr, "This PDP-11 emulator is called \"kek\" (reason for that is forgotten) and was written by Folkert van Heusden.\n");
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fprintf(stderr, "Build on: " __DATE__ " " __TIME__ "\n");
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bus *b = new bus();
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cpu *c = new cpu(b, &event);
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b->add_cpu(c);
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c -> setEmulateMFPT(true);
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bool testCases = false;
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int opt = -1;
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while((opt = getopt(argc, argv, "hm:T:R:p:ndL:")) != -1)
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{
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switch(opt) {
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case 'h':
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help();
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return 1;
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case 'd':
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c->setDisassemble(true);
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break;
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case 'n':
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withUI = true;
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break;
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case 'm':
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if (strcasecmp(optarg, "tc") == 0)
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testCases = true;
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else {
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fprintf(stderr, "\"-m %s\" is not known\n", optarg);
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return 1;
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}
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break;
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case 'T':
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c->setRegister(7, loadTape(b, optarg));
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break;
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case 'R': {
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b->add_rk05(new rk05(optarg, b, nullptr, nullptr));
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setBootLoader(b);
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break;
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}
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case 'p':
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c->setRegister(7, atoi(optarg));
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break;
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case 'L':
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loadbin(b, c->getRegister(7), optarg);
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break;
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default:
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fprintf(stderr, "-%c is not understood\n", opt);
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return 1;
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}
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}
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console *cnsl = nullptr;
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if (withUI)
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cnsl = new console_ncurses(&terminate);
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else
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cnsl = new console_posix(&terminate);
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tty *tty_ = new tty(cnsl);
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b->add_tty(tty_);
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if (testCases)
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tests(c);
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fprintf(stderr, "Start running at %o\n", c->getRegister(7));
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struct sigaction sa { };
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sa.sa_handler = sw_handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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if (withUI) {
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sigaction(SIGWINCH, &sa, nullptr);
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}
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sigaction(SIGTERM, &sa, nullptr);
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sigaction(SIGINT , &sa, nullptr);
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uint32_t icount = 0;
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uint64_t total_icount = 0;
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uint32_t refresh_interval = 262144;
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constexpr uint32_t pdp_11_70_mips = 1000000000 / 300; // 300ns cache
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const unsigned long start = get_ms();
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unsigned long interval_start = start;
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for(;;) {
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c->step();
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if (event) {
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#if !defined(ESP32)
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FILE *fh = fopen("halt.mac", "wb");
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if (fh) {
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uint16_t pc = 024320;
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fprintf(fh, "\t.LINK %06o\n", pc);
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for(int i=0; i<4096; i += 2)
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fprintf(fh, "\t.DW %06o\n", b->readWord((pc + i) & 0xffff));
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fprintf(fh, "\tmake_raw\n");
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fclose(fh);
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}
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#endif
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//c->setRegister(7, 01000);
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//c->resetHalt();
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break;
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}
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icount++;
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if (icount >= refresh_interval) {
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total_icount += icount;
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unsigned long now = get_ms();
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unsigned long took_ms = std::max(1ul, now - interval_start);
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refresh_interval = (1000 * icount) / took_ms;
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if (refresh_interval == 0)
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refresh_interval = 65536;
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else if (refresh_interval > pdp_11_70_mips)
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refresh_interval = pdp_11_70_mips;
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D(fprintf(stderr, "instructions_executed: %u, took_ms: %lu, new refresh_interval: %u\n", icount, took_ms, refresh_interval);)
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// if (withUI) {
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// mvwprintw(w_main_b -> win, 0, 24, "%.1f/s ", icount * 1000.0 / took_ms);
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// mvwprintw(w_main_b -> win, 0, 42, "%06o", b->get_switch_register());
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// mydoupdate();
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// }
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if (terminate)
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event = 1;
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interval_start = now;
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icount = 0;
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}
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}
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terminate = true;
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delete b;
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delete cnsl;
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fprintf(stderr, "Instructions per second: %.3f\n\n", total_icount * 1000.0 / (get_ms() - start));
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return 0;
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}
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