avr11.cc

#include <assert.h>
#include <cstdlib>
#include <setjmp.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>

#include "avr11.h"
#include "kb11.h"

KB11 cpu;

void setup(char *disk) {
    struct termios old_terminal_settings, new_terminal_settings;

    // Get the current terminal settings
    if (tcgetattr(0, &old_terminal_settings) < 0)
        perror("tcgetattr()");

    memcpy(&new_terminal_settings, &old_terminal_settings,
           sizeof(struct termios));

    // disable canonical mode processing in the line discipline driver
    new_terminal_settings.c_iflag &= ~ICRNL;
    new_terminal_settings.c_lflag &= ~ICANON;
    new_terminal_settings.c_lflag &= ~ECHO;

    // apply our new settings
    if (tcsetattr(0, TCSANOW, &new_terminal_settings) < 0)
        perror("tcsetattr ICANON");
    cpu.unibus.rk11.rkdata = fopen(disk, "rb+");
    cpu.reset();
    printf("Ready\n");
}

jmp_buf trapbuf;

void loop0();

[[noreturn]] void trap(uint16_t vec) { longjmp(trapbuf, vec); }

void loop() {
    auto vec = setjmp(trapbuf);
    if (vec == 0) {
        loop0();
    } else {
        cpu.trapat(vec);
    }
}

void loop0() {
    while (true) {
        cpu.step();
        if ((cpu.itab[0].vec > 0) && (cpu.itab[0].pri >= cpu.priority())) {
            cpu.trapat(cpu.itab[0].vec);
            cpu.popirq();
            return; // exit from loop to reset trapbuf
        }
        cpu.unibus.rk11.step();
        cpu.unibus.cons.poll();
    }
}

int main(int argc, char *argv[]) {
    assert(argc > 1);
    setup(argv[1]);
    while (1)
        loop();
}

void panic() {
    cpu.printstate();
    std::abort();
}