src/browser/starter.js - emulators/v86 - Rivoreo Source Code Repositories

 "use strict";

 /**
  * Constructor for emulator instances.
  *
  * Usage: `var emulator = new V86Starter(options);`
  *
  * Options can have the following properties (all optional, default in parenthesis):
  *
  * - `memory_size number` (16 * 1024 * 1024) - The memory size in bytes, should
  *   be a power of 2.
  * - `vga_memory_size number` (8 * 1024 * 1024) - VGA memory size in bytes.
  *
  * - `autostart boolean` (false) - If emulation should be started when emulator
  *   is ready.
  *
  * - `disable_keyboard boolean` (false) - If the keyboard should be disabled.
  * - `disable_mouse boolean` (false) - If the mouse should be disabled.
  *
  * - `network_relay_url string` (No network card) - The url of a server running
  *   websockproxy. See [networking.md](networking.md). Setting this will
  *   enable an emulated network card.
  *
  * - `bios Object` (No bios) - Either a url pointing to a bios or an
  *   ArrayBuffer, see below.
  * - `vga_bios Object` (No VGA bios) - VGA bios, see below.
  * - `hda Object` (No hard drive) - First hard disk, see below.
  * - `fda Object` (No floppy disk) - First floppy disk, see below.
  * - `cdrom Object` (No CD) - See below.
  * - `initial_state Object` (Normal boot) - An initial state to load, see
  *   [`restore_state`](#restore_statearraybuffer-state) and below.
  *
  * - `filesystem Object` (No 9p filesystem) - A 9p filesystem, see
  *   [filesystem.md](filesystem.md).
  *
  * - `serial_container HTMLTextAreaElement` (No serial terminal) - A textarea
  *   that will receive and send data to the emulated serial terminal.
  *   Alternatively the serial terminal can also be accessed programatically,
  *   see [serial.html](../examples/serial.html).
  *
  * - `screen_container HTMLElement` (No screen) - An HTMLElement. This should
  *   have a certain structure, see [basic.html](../examples/basic.html).
  *
  * ***
  *
  * There are two ways to load images (`bios`, `vga_bios`, `cdrom`, `hda`, ...):
  *
  * - Pass an object that has a url. Optionally, `async: true` and `size:
  *   size_in_bytes` can be added to the object, so that sectors of the image
  *   are loaded on demand instead of being loaded before boot (slower, but
  *   strongly recommended for big files). In that case, the `Range: bytes=...`
  *   header must be supported on the server.
  *
  *   ```javascript
  *   // download file before boot
  *   options.bios = {
  *       url: "bios/seabios.bin"
  *   }
  *   // download file sectors as requested, size is required
  *   options.hda = {
  *       url: "disk/linux.iso",
  *       async: true,
  *       size: 16 * 1024 * 1024
  *   }
  *   ```
  *
  * - Pass an `ArrayBuffer` or `File` object as `buffer` property.
  *
  *   ```javascript
  *   // use <input type=file>
  *   options.bios = {
  *       buffer: document.all.hd_image.files[0]
  *   }
  *   // start with empty hard drive
  *   options.hda = {
  *       buffer: new ArrayBuffer(16 * 1024 * 1024)
  *   }
  *   ```
  *
  * ***
  *
  * @param {Object} options Options to initialize the emulator with.
  * @constructor
  */
 function V86Starter(options)
 {
     //var worker = new Worker("src/browser/worker.js");
     //var adapter_bus = this.bus = WorkerBus.init(worker);

     this.cpu_is_running = false;

     var bus = Bus.create();
     var adapter_bus = this.bus = bus[0];
     this.emulator_bus = bus[1];
     var emulator = this.v86 = new v86(this.emulator_bus);

     this.bus.register("emulator-stopped", function()
     {
         this.cpu_is_running = false;
     }, this);

     this.bus.register("emulator-started", function()
     {
         this.cpu_is_running = true;
     }, this);

     var settings = {};

     this.disk_images = {
         "fda": undefined,
         "fdb": undefined,
         "hda": undefined,
         "hdb": undefined,
         "cdrom": undefined,
     };

     settings.load_devices = true;
     settings.memory_size = options["memory_size"] || 64 * 1024 * 1024;
     settings.vga_memory_size = options["vga_memory_size"] || 8 * 1024 * 1024;
     settings.boot_order = options["boot_order"] || 0x213;
     settings.fda = undefined;
     settings.fdb = undefined;

     if(options["network_relay_url"])
     {
         this.network_adapter = new NetworkAdapter(options["network_relay_url"], adapter_bus);
         settings.enable_ne2k = true;
     }

     if(!options["disable_keyboard"])
     {
         this.keyboard_adapter = new KeyboardAdapter(adapter_bus);
     }
     if(!options["disable_mouse"])
     {
         this.mouse_adapter = new MouseAdapter(adapter_bus);
     }

     if(options["screen_container"])
     {
         this.screen_adapter = new ScreenAdapter(options["screen_container"], adapter_bus);
     }

     if(options["serial_container"])
     {
         this.serial_adapter = new SerialAdapter(options["serial_container"], adapter_bus);
     }

     // ugly, but required for closure compiler compilation
     function put_on_settings(name, buffer)
     {
         switch(name)
         {
             case "hda":
                 settings.hda = this.disk_images["hda"] = buffer;
                 break;
             case "hdb":
                 settings.hdb = this.disk_images["hdb"] = buffer;
                 break;
             case "cdrom":
                 settings.cdrom = this.disk_images["cdrom"] = buffer;
                 break;
             case "fda":
                 settings.fda = this.disk_images["fda"] = buffer;
                 break;
             case "fdb":
                 settings.fdb = this.disk_images["fdb"] = buffer;
                 break;

             case "bios":
                 settings.bios = buffer.buffer;
                 break;
             case "vga_bios":
                 settings.vga_bios = buffer.buffer;
                 break;
             case "initial_state":
                 settings.initial_state = buffer.buffer;
                 break;
             case "fs9p_json":
                 settings.fs9p_json = buffer.buffer;
                 break;
             default:
                 dbg_assert(false, name);
         }
     }

     var files_to_load = [];

     function add_file(name, file)
     {
         if(!file)
         {
             return;
         }

         if(file["get"] && file["set"] && file["load"])
         {
             files_to_load.push({
                 name: name,
                 loadable: file,
             });
             return;
         }

         // Anything coming from the outside world needs to be quoted for
         // Closure Compiler compilation
         file = {
             buffer: file["buffer"],
             async: file["async"],
             url: file["url"],
             size: file["size"],
         };

         if(name === "bios" || name === "vga_bios" || name === "initial_state")
         {
             // Ignore async for these because they must be availabe before boot.
             // This should make result.buffer available after the object is loaded
             file.async = false;
         }

         if(file.buffer instanceof ArrayBuffer)
         {
             var buffer = new SyncBuffer(file.buffer);
             files_to_load.push({
                 name: name,
                 loadable: buffer,
             });
         }
         else if(file.buffer instanceof File)
         {
             // SyncFileBuffer:
             // - loads the whole disk image into memory, impossible for large files (more than 1GB)
             // - can later serve get/set operations fast and synchronously
             // - takes some time for first load, neglectable for small files (up to 100Mb)
             //
             // AsyncFileBuffer:
             // - loads slices of the file asynchronously as requested
             // - slower get/set

             // Heuristics: If file is smaller than 256M, use SyncFileBuffer
             if(file.async === undefined)
             {
                 file.async = file.buffer.size < 256 * 1024 * 1024;
             }

             if(file.async)
             {
                 var buffer = new v86util.SyncFileBuffer(file.buffer);
             }
             else
             {
                 var buffer = new v86util.AsyncFileBuffer(file.buffer);
             }

             files_to_load.push({
                 name: name,
                 loadable: buffer,
             });
         }
         else if(file.url)
         {
             if(file.async)
             {
                 var buffer = new v86util.AsyncXHRBuffer(file.url, file.size);
                 files_to_load.push({
                     name: name,
                     loadable: buffer,
                 });
             }
             else
             {
                 files_to_load.push({
                     name: name,
                     url: file.url,
                     size: file.size,
                 });
             }
         }
         else
         {
             dbg_log("Ignored file: url=" + file.url + " buffer=" + file.buffer);
         }
     }

     var image_names = [
         "bios", "vga_bios",
         "cdrom", "hda", "hdb", "fda", "fdb",
         "initial_state",
     ];

     for(var i = 0; i < image_names.length; i++)
     {
         add_file(image_names[i], options[image_names[i]]);
     }

     if(options["filesystem"])
     {
         var fs_url = options["filesystem"]["basefs"];
         var base_url = options["filesystem"]["baseurl"];

         this.fs9p = new FS(base_url);
         settings.fs9p = this.fs9p;

         if(fs_url)
         {
             console.assert(base_url, "Filesystem: baseurl must be specified");

             var size;

             if(typeof fs_url === "object")
             {
                 size = fs_url["size"];
                 fs_url = fs_url["url"];
             }
             dbg_assert(typeof fs_url === "string");

             files_to_load.push({
                 name: "fs9p_json",
                 url: fs_url,
                 size: size,
                 as_text: true,
             });
         }
     }

     var starter = this;
     var total = files_to_load.length;

     var cont = function(index)
     {
         if(index === total)
         {
             setTimeout(done.bind(this), 0);
             return;
         }

         var f = files_to_load[index];

         if(f.loadable)
         {
             f.loadable.onload = function(e)
             {
                 put_on_settings.call(this, f.name, f.loadable);
                 cont(index + 1);
             }.bind(this);
             f.loadable.load();
         }
         else
         {
             v86util.load_file(f.url, {
                 done: function(result)
                 {
                     put_on_settings.call(this, f.name, new SyncBuffer(result));
                     cont(index + 1);
                 }.bind(this),
                 progress: function progress(e)
                 {
                     starter.emulator_bus.send("download-progress", {
                         file_index: index,
                         file_count: total,
                         file_name: f.url,

                         lengthComputable: e.lengthComputable,
                         total: f.size || e.total,
                         loaded: e.loaded,
                     });
                 },
                 as_text: f.as_text,
             });
         }
     }.bind(this);
     cont(0);

     function done()
     {
         if(settings.initial_state)
         {
             settings.no_initial_alloc = true;
         }

         this.bus.send("cpu-init", settings);

         setTimeout(function()
         {
             if(settings.initial_state)
             {
                 emulator.restore_state(settings.initial_state);
             }

             setTimeout(function()
             {
                 if(settings.fs9p && settings.fs9p_json)
                 {
                     settings.fs9p.OnJSONLoaded(settings.fs9p_json);
                 }

                 if(options["autostart"])
                 {
                     this.bus.send("cpu-run");
                 }
             }.bind(this), 0)
         }.bind(this), 0);
     }
 }

 /**
  * Start emulation. Do nothing if emulator is running already. Can be
  * asynchronous.
  */
 V86Starter.prototype.run = function()
 {
     this.bus.send("cpu-run");
 };

 /**
  * Stop emulation. Do nothing if emulator is not running. Can be asynchronous.
  */
 V86Starter.prototype.stop = function()
 {
     this.bus.send("cpu-stop");
 };

 /**
  * @ignore
  */
 V86Starter.prototype.destroy = function()
 {
     this.keyboard_adapter.destroy();
 };

 /**
  * Restart (force a reboot).
  */
 V86Starter.prototype.restart = function()
 {
     this.bus.send("cpu-restart");
 };

 /**
  * Add an event listener (the emulator is an event emitter). A list of events
  * can be found at [events.md](events.md).
  *
  * The callback function gets a single argument which depends on the event.
  *
  * @param {string} event Name of the event.
  * @param {function(*)} listener The callback function.
  */
 V86Starter.prototype.add_listener = function(event, listener)
 {
     this.bus.register(event, listener, this);
 };

 /**
  * Remove an event listener.
  *
  * @param {string} event
  * @param {function(*)} listener
  */
 V86Starter.prototype.remove_listener = function(event, listener)
 {
     this.bus.unregister(event, listener);
 };

 /**
  * Restore the emulator state from the given state, which must be an
  * ArrayBuffer returned by
  * [`save_state`](#save_statefunctionobject-arraybuffer-callback).
  *
  * Note that the state can only be restored correctly if this constructor has
  * been created with the same options as the original instance (e.g., same disk
  * images, memory size, etc.).
  *
  * Different versions of the emulator might use a different format for the
  * state buffer.
  *
  * @param {ArrayBuffer} state
  */
 V86Starter.prototype.restore_state = function(state)
 {
     this.v86.restore_state(state);
 };

 /**
  * Asynchronously save the current state of the emulator. The first argument to
  * the callback is an Error object if something went wrong and is null
  * otherwise.
  *
  * @param {function(Object, ArrayBuffer)} callback
  */
 V86Starter.prototype.save_state = function(callback)
 {
     // Might become asynchronous at some point

     setTimeout(function()
     {
         try
         {
             callback(null, this.v86.save_state());
         }
         catch(e)
         {
             callback(e, null);
         }
     }.bind(this), 0);
 };

 /**
  * Return an object with several statistics. Return value looks similar to
  * (but can be subject to change in future versions or different
  * configurations, so use defensively):
  *
  * ```javascript
  * {
  *     "cpu": {
  *         "instruction_counter": 2821610069
  *     },
  *     "hda": {
  *         "sectors_read": 95240,
  *         "sectors_written": 952,
  *         "bytes_read": 48762880,
  *         "bytes_written": 487424,
  *         "loading": false
  *     },
  *     "cdrom": {
  *         "sectors_read": 0,
  *         "sectors_written": 0,
  *         "bytes_read": 0,
  *         "bytes_written": 0,
  *         "loading": false
  *     },
  *     "mouse": {
  *         "enabled": true
  *     },
  *     "vga": {
  *         "is_graphical": true,
  *         "res_x": 800,
  *         "res_y": 600,
  *         "bpp": 32
  *     }
  * }
  * ```
  *
  * @deprecated
  * @return {Object}
  */
 V86Starter.prototype.get_statistics = function()
 {
     console.warn("V86Starter.prototype.get_statistics is deprecated. Use events instead.");

     var stats = {
         cpu: {
             instruction_counter: this.get_instruction_counter(),
         },
     };

     if(!this.v86)
     {
         return stats;
     }

     var devices = this.v86.cpu.devices;

     if(devices.hda)
     {
         stats.hda = devices.hda.stats;
     }

     if(devices.cdrom)
     {
         stats.cdrom = devices.cdrom.stats;
     }

     if(devices.ps2)
     {
         stats["mouse"] = {
             "enabled": devices.ps2.use_mouse,
         };
     }

     if(devices.vga)
     {
         stats["vga"] = {
             "is_graphical": devices.vga.stats.is_graphical,
         };
     }

     return stats;
 };

 /**
  * @return {number}
  * @ignore
  */
 V86Starter.prototype.get_instruction_counter = function()
 {
     if(this.v86)
     {
         return this.v86.cpu.timestamp_counter;
     }
     else
     {
         // TODO: Should be handled using events
         return 0;
     }
 };

 /**
  * @return {boolean}
  */
 V86Starter.prototype.is_running = function()
 {
     return this.cpu_is_running;
 };

 /**
  * Send a sequence of scan codes to the emulated PS2 controller. A list of
  * codes can be found at http://stanislavs.org/helppc/make_codes.html.
  * Do nothing if there is no keyboard controller.
  *
  * @param {Array.<number>} codes
  */
 V86Starter.prototype.keyboard_send_scancodes = function(codes)
 {
     for(var i = 0; i < codes.length; i++)
     {
         this.bus.send("keyboard-code", codes[i]);
     }
 };

 /**
  * Send translated keys
  * @ignore
  */
 V86Starter.prototype.keyboard_send_keys = function(codes)
 {
     for(var i = 0; i < codes.length; i++)
     {
         this.keyboard_adapter.simulate_press(codes[i]);
     }
 };

 /**
  * Send text
  * @ignore
  */
 V86Starter.prototype.keyboard_send_text = function(string)
 {
     for(var i = 0; i < string.length; i++)
     {
         this.keyboard_adapter.simulate_char(string[i]);
     }
 };

 /**
  * Download a screenshot.
  *
  * @ignore
  */
 V86Starter.prototype.screen_make_screenshot = function()
 {
     if(this.screen_adapter)
     {
         this.screen_adapter.make_screenshot();
     }
 };

 /**
  * Set the scaling level of the emulated screen.
  *
  * @param {number} sx
  * @param {number} sy
  *
  * @ignore
  */
 V86Starter.prototype.screen_set_scale = function(sx, sy)
 {
     if(this.screen_adapter)
     {
         this.screen_adapter.set_scale(sx, sy);
     }
 };

 /**
  * Go fullscreen.
  *
  * @ignore
  */
 V86Starter.prototype.screen_go_fullscreen = function()
 {
     if(!this.screen_adapter)
     {
         return;
     }

     var elem = document.getElementById("screen_container");

     if(!elem)
     {
         return;
     }

     // bracket notation because otherwise they get renamed by closure compiler
     var fn = elem["requestFullScreen"] ||
             elem["webkitRequestFullscreen"] ||
             elem["mozRequestFullScreen"] ||
             elem["msRequestFullScreen"];

     if(fn)
     {
         fn.call(elem);

         // This is necessary, because otherwise chromium keyboard doesn't work anymore.
         // Might (but doesn't seem to) break something else
         var focus_element = document.getElementsByClassName("phone_keyboard")[0];
         focus_element && focus_element.focus();
     }

     //this.lock_mouse(elem);
     this.lock_mouse();
 };

 /**
  * Lock the mouse cursor: It becomes invisble and is not moved out of the
  * browser window.
  *
  * @ignore
  */
 V86Starter.prototype.lock_mouse = function()
 {
     var elem = document.body;

     var fn = elem["requestPointerLock"] ||
                 elem["mozRequestPointerLock"] ||
                 elem["webkitRequestPointerLock"];

     if(fn)
     {
         fn.call(elem);
     }
 };

 /**
  * Enable or disable sending mouse events to the emulated PS2 controller.
  *
  * @param {boolean} enabled
  */
 V86Starter.prototype.mouse_set_status = function(enabled)
 {
     if(this.mouse_adapter)
     {
         this.mouse_adapter.emu_enabled = enabled;
     }
 };

 /**
  * Enable or disable sending keyboard events to the emulated PS2 controller.
  *
  * @param {boolean} enabled
  */
 V86Starter.prototype.keyboard_set_status = function(enabled)
 {
     if(this.keyboard_adapter)
     {
         this.keyboard_adapter.emu_enabled = enabled;
     }
 };


 /**
  * Send a string to the first emulated serial terminal.
  *
  * @param {string} data
  */
 V86Starter.prototype.serial0_send = function(data)
 {
     for(var i = 0; i < data.length; i++)
     {
         this.bus.send("serial0-input", data.charCodeAt(i));
     }
 };

 /**
  * Write to a file in the 9p filesystem. Nothing happens if no filesystem has
  * been initialized. First argument to the callback is an error object if
  * something went wrong and null otherwise.
  *
  * @param {string} file
  * @param {Uint8Array} data
  * @param {function(Object)=} callback
  */
 V86Starter.prototype.create_file = function(file, data, callback)
 {
     var fs = this.fs9p;

     if(!fs)
     {
         return;
     }

     var parts = file.split("/");
     var filename = parts[parts.length - 1];

     var path_infos = fs.SearchPath(file);
     var parent_id = path_infos.parentid;
     var not_found = filename === "" || parent_id === -1

     if(!not_found)
     {
         fs.CreateBinaryFile(filename, parent_id, data);
     }

     if(callback)
     {
         setTimeout(function()
         {
             if(not_found)
             {
                 callback(new FileNotFoundError());
             }
             else
             {
                 callback(null);
             }
         }, 0);
     }
 };

 /**
  * Read a file in the 9p filesystem. Nothing happens if no filesystem has been
  * initialized.
  *
  * @param {string} file
  * @param {function(Object, Uint8Array)} callback
  */
 V86Starter.prototype.read_file = function(file, callback)
 {
     var fs = this.fs9p;

     if(!fs)
     {
         return;
     }

     var path_infos = fs.SearchPath(file);
     var id = path_infos.id;

     if(id === -1)
     {
         callback(new FileNotFoundError(), null);
     }
     else
     {
         fs.OpenInode(id, undefined);
         fs.AddEvent(
             id,
             function()
             {
                 var data = fs.inodedata[id];

                 if(data)
                 {
                     callback(null, data.subarray(0, fs.inodes[id].size));
                 }
                 else
                 {
                     callback(new FileNotFoundError(), null);
                 }
             }
         );
     }
 };

 /**
  * @ignore
  * @constructor
  *
  * @param {string=} message
  */
 function FileNotFoundError(message)
 {
     this.message = message || "File not found";
 }
 FileNotFoundError.prototype = Error.prototype;

 // Closure Compiler's way of exporting
 if(typeof window !== "undefined")
 {
     window["V86Starter"] = V86Starter;
     window["V86"] = V86Starter;
 }
 else if(typeof module !== "undefined" && typeof module.exports !== "undefined")
 {
     module.exports["V86Starter"] = V86Starter;
     module.exports["V86"] = V86Starter;
 }
 else if(typeof importScripts === "function")
 {
     // web worker
     self["V86Starter"] = V86Starter;
     self["V86"] = V86Starter;
 }

 V86Starter.prototype["run"] = V86Starter.prototype.run;
 V86Starter.prototype["stop"] = V86Starter.prototype.stop;
 V86Starter.prototype["restart"] = V86Starter.prototype.restart;
 V86Starter.prototype["destroy"] = V86Starter.prototype.destroy;
 V86Starter.prototype["add_listener"] = V86Starter.prototype.add_listener;
 V86Starter.prototype["remove_listener"] = V86Starter.prototype.remove_listener;
 V86Starter.prototype["restore_state"] = V86Starter.prototype.restore_state;
 V86Starter.prototype["save_state"] = V86Starter.prototype.save_state;
 V86Starter.prototype["get_statistics"] = V86Starter.prototype.get_statistics;
 V86Starter.prototype["is_running"] = V86Starter.prototype.is_running;
 V86Starter.prototype["keyboard_send_scancodes"] = V86Starter.prototype.keyboard_send_scancodes;
 V86Starter.prototype["keyboard_send_keys"] = V86Starter.prototype.keyboard_send_keys;
 V86Starter.prototype["keyboard_send_text"] = V86Starter.prototype.keyboard_send_text;
 V86Starter.prototype["screen_make_screenshot"] = V86Starter.prototype.screen_make_screenshot;
 V86Starter.prototype["screen_set_scale"] = V86Starter.prototype.screen_set_scale;
 V86Starter.prototype["screen_go_fullscreen"] = V86Starter.prototype.screen_go_fullscreen;
 V86Starter.prototype["lock_mouse"] = V86Starter.prototype.lock_mouse;
 V86Starter.prototype["mouse_set_status"] = V86Starter.prototype.mouse_set_status;
 V86Starter.prototype["keyboard_set_status"] = V86Starter.prototype.keyboard_set_status;
 V86Starter.prototype["serial0_send"] = V86Starter.prototype.serial0_send;
 V86Starter.prototype["create_file"] = V86Starter.prototype.create_file;
 V86Starter.prototype["read_file"] = V86Starter.prototype.read_file;
	"use strict";

	/**
	* Constructor for emulator instances.
	*
	* Usage: `var emulator = new V86Starter(options);`
	*
	* Options can have the following properties (all optional, default in parenthesis):
	*
	* - `memory_size number` (16 * 1024 * 1024) - The memory size in bytes, should
	* be a power of 2.
	* - `vga_memory_size number` (8 * 1024 * 1024) - VGA memory size in bytes.
	*
	* - `autostart boolean` (false) - If emulation should be started when emulator
	* is ready.
	*
	* - `disable_keyboard boolean` (false) - If the keyboard should be disabled.
	* - `disable_mouse boolean` (false) - If the mouse should be disabled.
	*
	* - `network_relay_url string` (No network card) - The url of a server running
	* websockproxy. See [networking.md](networking.md). Setting this will
	* enable an emulated network card.
	*
	* - `bios Object` (No bios) - Either a url pointing to a bios or an
	* ArrayBuffer, see below.
	* - `vga_bios Object` (No VGA bios) - VGA bios, see below.
	* - `hda Object` (No hard drive) - First hard disk, see below.
	* - `fda Object` (No floppy disk) - First floppy disk, see below.
	* - `cdrom Object` (No CD) - See below.
	* - `initial_state Object` (Normal boot) - An initial state to load, see
	* [`restore_state`](#restore_statearraybuffer-state) and below.
	*
	* - `filesystem Object` (No 9p filesystem) - A 9p filesystem, see
	* [filesystem.md](filesystem.md).
	*
	* - `serial_container HTMLTextAreaElement` (No serial terminal) - A textarea
	* that will receive and send data to the emulated serial terminal.
	* Alternatively the serial terminal can also be accessed programatically,
	* see [serial.html](../examples/serial.html).
	*
	* - `screen_container HTMLElement` (No screen) - An HTMLElement. This should
	* have a certain structure, see [basic.html](../examples/basic.html).
	*
	* ***
	*
	* There are two ways to load images (`bios`, `vga_bios`, `cdrom`, `hda`, ...):
	*
	* - Pass an object that has a url. Optionally, `async: true` and `size:
	* size_in_bytes` can be added to the object, so that sectors of the image
	* are loaded on demand instead of being loaded before boot (slower, but
	* strongly recommended for big files). In that case, the `Range: bytes=...`
	* header must be supported on the server.
	*
	* ```javascript
	* // download file before boot
	* options.bios = {
	* url: "bios/seabios.bin"
	* }
	* // download file sectors as requested, size is required
	* options.hda = {
	* url: "disk/linux.iso",
	* async: true,
	* size: 16 * 1024 * 1024
	* }
	* ```
	*
	* - Pass an `ArrayBuffer` or `File` object as `buffer` property.
	*
	* ```javascript
	* // use <input type=file>
	* options.bios = {
	* buffer: document.all.hd_image.files[0]
	* }
	* // start with empty hard drive
	* options.hda = {
	* buffer: new ArrayBuffer(16 * 1024 * 1024)
	* }
	* ```
	*
	* ***
	*
	* @param {Object} options Options to initialize the emulator with.
	* @constructor
	*/
	function V86Starter(options)
	{
	//var worker = new Worker("src/browser/worker.js");
	//var adapter_bus = this.bus = WorkerBus.init(worker);

	this.cpu_is_running = false;

	var bus = Bus.create();
	var adapter_bus = this.bus = bus[0];
	this.emulator_bus = bus[1];
	var emulator = this.v86 = new v86(this.emulator_bus);

	this.bus.register("emulator-stopped", function()
	{
	this.cpu_is_running = false;
	}, this);

	this.bus.register("emulator-started", function()
	{
	this.cpu_is_running = true;
	}, this);

	var settings = {};

	this.disk_images = {
	"fda": undefined,
	"fdb": undefined,
	"hda": undefined,
	"hdb": undefined,
	"cdrom": undefined,
	};

	settings.load_devices = true;
	settings.memory_size = options["memory_size"] \|\| 64 * 1024 * 1024;
	settings.vga_memory_size = options["vga_memory_size"] \|\| 8 * 1024 * 1024;
	settings.boot_order = options["boot_order"] \|\| 0x213;
	settings.fda = undefined;
	settings.fdb = undefined;

	if(options["network_relay_url"])
	{
	this.network_adapter = new NetworkAdapter(options["network_relay_url"], adapter_bus);
	settings.enable_ne2k = true;
	}

	if(!options["disable_keyboard"])
	{
	this.keyboard_adapter = new KeyboardAdapter(adapter_bus);
	}
	if(!options["disable_mouse"])
	{
	this.mouse_adapter = new MouseAdapter(adapter_bus);
	}

	if(options["screen_container"])
	{
	this.screen_adapter = new ScreenAdapter(options["screen_container"], adapter_bus);
	}

	if(options["serial_container"])
	{
	this.serial_adapter = new SerialAdapter(options["serial_container"], adapter_bus);
	}

	// ugly, but required for closure compiler compilation
	function put_on_settings(name, buffer)
	{
	switch(name)
	{
	case "hda":
	settings.hda = this.disk_images["hda"] = buffer;
	break;
	case "hdb":
	settings.hdb = this.disk_images["hdb"] = buffer;
	break;
	case "cdrom":
	settings.cdrom = this.disk_images["cdrom"] = buffer;
	break;
	case "fda":
	settings.fda = this.disk_images["fda"] = buffer;
	break;
	case "fdb":
	settings.fdb = this.disk_images["fdb"] = buffer;
	break;

	case "bios":
	settings.bios = buffer.buffer;
	break;
	case "vga_bios":
	settings.vga_bios = buffer.buffer;
	break;
	case "initial_state":
	settings.initial_state = buffer.buffer;
	break;
	case "fs9p_json":
	settings.fs9p_json = buffer.buffer;
	break;
	default:
	dbg_assert(false, name);
	}
	}

	var files_to_load = [];

	function add_file(name, file)
	{
	if(!file)
	{
	return;
	}

	if(file["get"] && file["set"] && file["load"])
	{
	files_to_load.push({
	name: name,
	loadable: file,
	});
	return;
	}

	// Anything coming from the outside world needs to be quoted for
	// Closure Compiler compilation
	file = {
	buffer: file["buffer"],
	async: file["async"],
	url: file["url"],
	size: file["size"],
	};

	if(name === "bios" \|\| name === "vga_bios" \|\| name === "initial_state")
	{
	// Ignore async for these because they must be availabe before boot.
	// This should make result.buffer available after the object is loaded
	file.async = false;
	}

	if(file.buffer instanceof ArrayBuffer)
	{
	var buffer = new SyncBuffer(file.buffer);
	files_to_load.push({
	name: name,
	loadable: buffer,
	});
	}
	else if(file.buffer instanceof File)
	{
	// SyncFileBuffer:
	// - loads the whole disk image into memory, impossible for large files (more than 1GB)
	// - can later serve get/set operations fast and synchronously
	// - takes some time for first load, neglectable for small files (up to 100Mb)
	//
	// AsyncFileBuffer:
	// - loads slices of the file asynchronously as requested
	// - slower get/set

	// Heuristics: If file is smaller than 256M, use SyncFileBuffer
	if(file.async === undefined)
	{
	file.async = file.buffer.size < 256 * 1024 * 1024;
	}

	if(file.async)
	{
	var buffer = new v86util.SyncFileBuffer(file.buffer);
	}
	else
	{
	var buffer = new v86util.AsyncFileBuffer(file.buffer);
	}

	files_to_load.push({
	name: name,
	loadable: buffer,
	});
	}
	else if(file.url)
	{
	if(file.async)
	{
	var buffer = new v86util.AsyncXHRBuffer(file.url, file.size);
	files_to_load.push({
	name: name,
	loadable: buffer,
	});
	}
	else
	{
	files_to_load.push({
	name: name,
	url: file.url,
	size: file.size,
	});
	}
	}
	else
	{
	dbg_log("Ignored file: url=" + file.url + " buffer=" + file.buffer);
	}
	}

	var image_names = [
	"bios", "vga_bios",
	"cdrom", "hda", "hdb", "fda", "fdb",
	"initial_state",
	];

	for(var i = 0; i < image_names.length; i++)
	{
	add_file(image_names[i], options[image_names[i]]);
	}

	if(options["filesystem"])
	{
	var fs_url = options["filesystem"]["basefs"];
	var base_url = options["filesystem"]["baseurl"];

	this.fs9p = new FS(base_url);
	settings.fs9p = this.fs9p;

	if(fs_url)
	{
	console.assert(base_url, "Filesystem: baseurl must be specified");

	var size;

	if(typeof fs_url === "object")
	{
	size = fs_url["size"];
	fs_url = fs_url["url"];
	}
	dbg_assert(typeof fs_url === "string");

	files_to_load.push({
	name: "fs9p_json",
	url: fs_url,
	size: size,
	as_text: true,
	});
	}
	}

	var starter = this;
	var total = files_to_load.length;

	var cont = function(index)
	{
	if(index === total)
	{
	setTimeout(done.bind(this), 0);
	return;
	}

	var f = files_to_load[index];

	if(f.loadable)
	{
	f.loadable.onload = function(e)
	{
	put_on_settings.call(this, f.name, f.loadable);
	cont(index + 1);
	}.bind(this);
	f.loadable.load();
	}
	else
	{
	v86util.load_file(f.url, {
	done: function(result)
	{
	put_on_settings.call(this, f.name, new SyncBuffer(result));
	cont(index + 1);
	}.bind(this),
	progress: function progress(e)
	{
	starter.emulator_bus.send("download-progress", {
	file_index: index,
	file_count: total,
	file_name: f.url,

	lengthComputable: e.lengthComputable,
	total: f.size \|\| e.total,
	loaded: e.loaded,
	});
	},
	as_text: f.as_text,
	});
	}
	}.bind(this);
	cont(0);

	function done()
	{
	if(settings.initial_state)
	{
	settings.no_initial_alloc = true;
	}

	this.bus.send("cpu-init", settings);

	setTimeout(function()
	{
	if(settings.initial_state)
	{
	emulator.restore_state(settings.initial_state);
	}

	setTimeout(function()
	{
	if(settings.fs9p && settings.fs9p_json)
	{
	settings.fs9p.OnJSONLoaded(settings.fs9p_json);
	}

	if(options["autostart"])
	{
	this.bus.send("cpu-run");
	}
	}.bind(this), 0)
	}.bind(this), 0);
	}
	}

	/**
	* Start emulation. Do nothing if emulator is running already. Can be
	* asynchronous.
	*/
	V86Starter.prototype.run = function()
	{
	this.bus.send("cpu-run");
	};

	/**
	* Stop emulation. Do nothing if emulator is not running. Can be asynchronous.
	*/
	V86Starter.prototype.stop = function()
	{
	this.bus.send("cpu-stop");
	};

	/**
	* @ignore
	*/
	V86Starter.prototype.destroy = function()
	{
	this.keyboard_adapter.destroy();
	};

	/**
	* Restart (force a reboot).
	*/
	V86Starter.prototype.restart = function()
	{
	this.bus.send("cpu-restart");
	};

	/**
	* Add an event listener (the emulator is an event emitter). A list of events
	* can be found at [events.md](events.md).
	*
	* The callback function gets a single argument which depends on the event.
	*
	* @param {string} event Name of the event.
	* @param {function(*)} listener The callback function.
	*/
	V86Starter.prototype.add_listener = function(event, listener)
	{
	this.bus.register(event, listener, this);
	};

	/**
	* Remove an event listener.
	*
	* @param {string} event
	* @param {function(*)} listener
	*/
	V86Starter.prototype.remove_listener = function(event, listener)
	{
	this.bus.unregister(event, listener);
	};

	/**
	* Restore the emulator state from the given state, which must be an
	* ArrayBuffer returned by
	* [`save_state`](#save_statefunctionobject-arraybuffer-callback).
	*
	* Note that the state can only be restored correctly if this constructor has
	* been created with the same options as the original instance (e.g., same disk
	* images, memory size, etc.).
	*
	* Different versions of the emulator might use a different format for the
	* state buffer.
	*
	* @param {ArrayBuffer} state
	*/
	V86Starter.prototype.restore_state = function(state)
	{
	this.v86.restore_state(state);
	};

	/**
	* Asynchronously save the current state of the emulator. The first argument to
	* the callback is an Error object if something went wrong and is null
	* otherwise.
	*
	* @param {function(Object, ArrayBuffer)} callback
	*/
	V86Starter.prototype.save_state = function(callback)
	{
	// Might become asynchronous at some point

	setTimeout(function()
	{
	try
	{
	callback(null, this.v86.save_state());
	}
	catch(e)
	{
	callback(e, null);
	}
	}.bind(this), 0);
	};

	/**
	* Return an object with several statistics. Return value looks similar to
	* (but can be subject to change in future versions or different
	* configurations, so use defensively):
	*
	* ```javascript
	* {
	* "cpu": {
	* "instruction_counter": 2821610069
	* },
	* "hda": {
	* "sectors_read": 95240,
	* "sectors_written": 952,
	* "bytes_read": 48762880,
	* "bytes_written": 487424,
	* "loading": false
	* },
	* "cdrom": {
	* "sectors_read": 0,
	* "sectors_written": 0,
	* "bytes_read": 0,
	* "bytes_written": 0,
	* "loading": false
	* },
	* "mouse": {
	* "enabled": true
	* },
	* "vga": {
	* "is_graphical": true,
	* "res_x": 800,
	* "res_y": 600,
	* "bpp": 32
	* }
	* }
	* ```
	*
	* @deprecated
	* @return {Object}
	*/
	V86Starter.prototype.get_statistics = function()
	{
	console.warn("V86Starter.prototype.get_statistics is deprecated. Use events instead.");

	var stats = {
	cpu: {
	instruction_counter: this.get_instruction_counter(),
	},
	};

	if(!this.v86)
	{
	return stats;
	}

	var devices = this.v86.cpu.devices;

	if(devices.hda)
	{
	stats.hda = devices.hda.stats;
	}

	if(devices.cdrom)
	{
	stats.cdrom = devices.cdrom.stats;
	}

	if(devices.ps2)
	{
	stats["mouse"] = {
	"enabled": devices.ps2.use_mouse,
	};
	}

	if(devices.vga)
	{
	stats["vga"] = {
	"is_graphical": devices.vga.stats.is_graphical,
	};
	}

	return stats;
	};

	/**
	* @return {number}
	* @ignore
	*/
	V86Starter.prototype.get_instruction_counter = function()
	{
	if(this.v86)
	{
	return this.v86.cpu.timestamp_counter;
	}
	else
	{
	// TODO: Should be handled using events
	return 0;
	}
	};

	/**
	* @return {boolean}
	*/
	V86Starter.prototype.is_running = function()
	{
	return this.cpu_is_running;
	};

	/**
	* Send a sequence of scan codes to the emulated PS2 controller. A list of
	* codes can be found at http://stanislavs.org/helppc/make_codes.html.
	* Do nothing if there is no keyboard controller.
	*
	* @param {Array.<number>} codes
	*/
	V86Starter.prototype.keyboard_send_scancodes = function(codes)
	{
	for(var i = 0; i < codes.length; i++)
	{
	this.bus.send("keyboard-code", codes[i]);
	}
	};

	/**
	* Send translated keys
	* @ignore
	*/
	V86Starter.prototype.keyboard_send_keys = function(codes)
	{
	for(var i = 0; i < codes.length; i++)
	{
	this.keyboard_adapter.simulate_press(codes[i]);
	}
	};

	/**
	* Send text
	* @ignore
	*/
	V86Starter.prototype.keyboard_send_text = function(string)
	{
	for(var i = 0; i < string.length; i++)
	{
	this.keyboard_adapter.simulate_char(string[i]);
	}
	};

	/**
	* Download a screenshot.
	*
	* @ignore
	*/
	V86Starter.prototype.screen_make_screenshot = function()
	{
	if(this.screen_adapter)
	{
	this.screen_adapter.make_screenshot();
	}
	};

	/**
	* Set the scaling level of the emulated screen.
	*
	* @param {number} sx
	* @param {number} sy
	*
	* @ignore
	*/
	V86Starter.prototype.screen_set_scale = function(sx, sy)
	{
	if(this.screen_adapter)
	{
	this.screen_adapter.set_scale(sx, sy);
	}
	};

	/**
	* Go fullscreen.
	*
	* @ignore
	*/
	V86Starter.prototype.screen_go_fullscreen = function()
	{
	if(!this.screen_adapter)
	{
	return;
	}

	var elem = document.getElementById("screen_container");

	if(!elem)
	{
	return;
	}

	// bracket notation because otherwise they get renamed by closure compiler
	var fn = elem["requestFullScreen"] \|\|
	elem["webkitRequestFullscreen"] \|\|
	elem["mozRequestFullScreen"] \|\|
	elem["msRequestFullScreen"];

	if(fn)
	{
	fn.call(elem);

	// This is necessary, because otherwise chromium keyboard doesn't work anymore.
	// Might (but doesn't seem to) break something else
	var focus_element = document.getElementsByClassName("phone_keyboard")[0];
	focus_element && focus_element.focus();
	}

	//this.lock_mouse(elem);
	this.lock_mouse();
	};

	/**
	* Lock the mouse cursor: It becomes invisble and is not moved out of the
	* browser window.
	*
	* @ignore
	*/
	V86Starter.prototype.lock_mouse = function()
	{
	var elem = document.body;

	var fn = elem["requestPointerLock"] \|\|
	elem["mozRequestPointerLock"] \|\|
	elem["webkitRequestPointerLock"];

	if(fn)
	{
	fn.call(elem);
	}
	};

	/**
	* Enable or disable sending mouse events to the emulated PS2 controller.
	*
	* @param {boolean} enabled
	*/
	V86Starter.prototype.mouse_set_status = function(enabled)
	{
	if(this.mouse_adapter)
	{
	this.mouse_adapter.emu_enabled = enabled;
	}
	};

	/**
	* Enable or disable sending keyboard events to the emulated PS2 controller.
	*
	* @param {boolean} enabled
	*/
	V86Starter.prototype.keyboard_set_status = function(enabled)
	{
	if(this.keyboard_adapter)
	{
	this.keyboard_adapter.emu_enabled = enabled;
	}
	};


	/**
	* Send a string to the first emulated serial terminal.
	*
	* @param {string} data
	*/
	V86Starter.prototype.serial0_send = function(data)
	{
	for(var i = 0; i < data.length; i++)
	{
	this.bus.send("serial0-input", data.charCodeAt(i));
	}
	};

	/**
	* Write to a file in the 9p filesystem. Nothing happens if no filesystem has
	* been initialized. First argument to the callback is an error object if
	* something went wrong and null otherwise.
	*
	* @param {string} file
	* @param {Uint8Array} data
	* @param {function(Object)=} callback
	*/
	V86Starter.prototype.create_file = function(file, data, callback)
	{
	var fs = this.fs9p;

	if(!fs)
	{
	return;
	}

	var parts = file.split("/");
	var filename = parts[parts.length - 1];

	var path_infos = fs.SearchPath(file);
	var parent_id = path_infos.parentid;
	var not_found = filename === "" \|\| parent_id === -1

	if(!not_found)
	{
	fs.CreateBinaryFile(filename, parent_id, data);
	}

	if(callback)
	{
	setTimeout(function()
	{
	if(not_found)
	{
	callback(new FileNotFoundError());
	}
	else
	{
	callback(null);
	}
	}, 0);
	}
	};

	/**
	* Read a file in the 9p filesystem. Nothing happens if no filesystem has been
	* initialized.
	*
	* @param {string} file
	* @param {function(Object, Uint8Array)} callback
	*/
	V86Starter.prototype.read_file = function(file, callback)
	{
	var fs = this.fs9p;

	if(!fs)
	{
	return;
	}

	var path_infos = fs.SearchPath(file);
	var id = path_infos.id;

	if(id === -1)
	{
	callback(new FileNotFoundError(), null);
	}
	else
	{
	fs.OpenInode(id, undefined);
	fs.AddEvent(
	id,
	function()
	{
	var data = fs.inodedata[id];

	if(data)
	{
	callback(null, data.subarray(0, fs.inodes[id].size));
	}
	else
	{
	callback(new FileNotFoundError(), null);
	}
	}
	);
	}
	};

	/**
	* @ignore
	* @constructor
	*
	* @param {string=} message
	*/
	function FileNotFoundError(message)
	{
	this.message = message \|\| "File not found";
	}
	FileNotFoundError.prototype = Error.prototype;

	// Closure Compiler's way of exporting
	if(typeof window !== "undefined")
	{
	window["V86Starter"] = V86Starter;
	window["V86"] = V86Starter;
	}
	else if(typeof module !== "undefined" && typeof module.exports !== "undefined")
	{
	module.exports["V86Starter"] = V86Starter;
	module.exports["V86"] = V86Starter;
	}
	else if(typeof importScripts === "function")
	{
	// web worker
	self["V86Starter"] = V86Starter;
	self["V86"] = V86Starter;
	}

	V86Starter.prototype["run"] = V86Starter.prototype.run;
	V86Starter.prototype["stop"] = V86Starter.prototype.stop;
	V86Starter.prototype["restart"] = V86Starter.prototype.restart;
	V86Starter.prototype["destroy"] = V86Starter.prototype.destroy;
	V86Starter.prototype["add_listener"] = V86Starter.prototype.add_listener;
	V86Starter.prototype["remove_listener"] = V86Starter.prototype.remove_listener;
	V86Starter.prototype["restore_state"] = V86Starter.prototype.restore_state;
	V86Starter.prototype["save_state"] = V86Starter.prototype.save_state;
	V86Starter.prototype["get_statistics"] = V86Starter.prototype.get_statistics;
	V86Starter.prototype["is_running"] = V86Starter.prototype.is_running;
	V86Starter.prototype["keyboard_send_scancodes"] = V86Starter.prototype.keyboard_send_scancodes;
	V86Starter.prototype["keyboard_send_keys"] = V86Starter.prototype.keyboard_send_keys;
	V86Starter.prototype["keyboard_send_text"] = V86Starter.prototype.keyboard_send_text;
	V86Starter.prototype["screen_make_screenshot"] = V86Starter.prototype.screen_make_screenshot;
	V86Starter.prototype["screen_set_scale"] = V86Starter.prototype.screen_set_scale;
	V86Starter.prototype["screen_go_fullscreen"] = V86Starter.prototype.screen_go_fullscreen;
	V86Starter.prototype["lock_mouse"] = V86Starter.prototype.lock_mouse;
	V86Starter.prototype["mouse_set_status"] = V86Starter.prototype.mouse_set_status;
	V86Starter.prototype["keyboard_set_status"] = V86Starter.prototype.keyboard_set_status;
	V86Starter.prototype["serial0_send"] = V86Starter.prototype.serial0_send;
	V86Starter.prototype["create_file"] = V86Starter.prototype.create_file;
	V86Starter.prototype["read_file"] = V86Starter.prototype.read_file;