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v86
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<!doctype html>
<title>Serial example</title>

<script src="../build/libv86.js"></script>
<script>
"use strict";

window.onload = function()
{
    var emulator = new V86({
        wasm_path: "../build/v86.wasm",

        // Uncomment to see what's going on
        //screen_container: document.getElementById("screen_container"),

        bios: {
            url: "../bios/seabios.bin",
        },
        vga_bios: {
            url: "../bios/vgabios.bin",
        },
        bzimage: {
            url: "../images/buildroot-bzimage68.bin",
            async: false,
        },
        filesystem: {},
        cmdline: "tsc=reliable mitigations=off random.trust_cpu=on",
        autostart: true,
        disable_keyboard: true,
    });

    // In this example we wait for output from the serial terminal, which
    // should be running busybox. We log in as soon as a prompt appears and then
    // retrieve a directory listing of the root directory
    var data = "";

    var stages = [
        {
            test: "~% ",
            send: "ls -1 --color=never /\n",
        },
        {
            test: "~% ",
            send: "lua -e 'print(3+4)'\n",
        },
    ];
    var stage = 0;

    emulator.add_listener("serial0-output-byte", function(byte)
    {
        var char = String.fromCharCode(byte);
        if(char === "\r")
        {
            return;
        }

        data += char;
        document.getElementById("terminal").value += char;

        var current = stages[stage];

        if(!current)
        {
            return;
        }

        if(data.endsWith(current.test))
        {
            stage++;
            emulator.serial0_send(current.send);

            var log = "Sending: " + current.send.replace(/\n/g, "\\n") + "\n";
            document.getElementById("log").value += log;
        }
    });
};
</script>

<textarea readonly rows=25 cols=60 id="log">Waiting for boot ...
</textarea>

<textarea readonly rows=25 cols=60 id="terminal"></textarea>

<div id="screen_container">
    <div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
    <canvas style="display: none"></canvas>
</div>