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+<!doctype html>
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+<title>Basic Emulator</title><!-- not BASIC! -->
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+<style>
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+ div {
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+ font-size: 12px;
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+ line-height: 16px;
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+ }
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+ BODY {
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+ background-color: #111;
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+ display: flex;
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+ justify-content: center;
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+ align-items: center;
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+ height: 100vh;
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+ overflow: hidden;
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+ }
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+</style>
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+
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+<script src="../build/libv86.js"></script>
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+<script>
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+"use strict";
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+
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+// Libs
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+ // SO: 40031688
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+ function buf2hex(buffer) { // buffer is an ArrayBuffer
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+ return [...new Uint8Array(buffer)]
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+ .map(x => x.toString(16).padStart(2, '0'))
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+ .join('');
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+ }
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+
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+class ATStream {
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+ constructor ({ delegate, acc, transform, observe }) {
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+ this.delegate = delegate;
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+ if ( acc ) this.acc = acc;
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+ if ( transform ) this.transform = transform;
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+ if ( observe ) this.observe = observe;
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+ this.state = {};
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+ this.carry = [];
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+ }
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+ [Symbol.asyncIterator]() { return this; }
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+ async next_value_ () {
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+ if ( this.carry.length > 0 ) {
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+ console.log('got from carry!', this.carry);
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+ return {
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+ value: this.carry.shift(),
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+ done: false,
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+ };
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+ }
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+ return await this.delegate.next();
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+ }
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+ async acc ({ value }) {
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+ return value;
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+ }
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+ async next_ () {
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+ for (;;) {
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+ const ret = await this.next_value_();
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+ if ( ret.done ) return ret;
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+ const v = await this.acc({
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+ state: this.state,
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+ value: ret.value,
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+ carry: v => this.carry.push(v),
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+ });
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+ if ( this.carry.length >= 0 && v === undefined ) {
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+ throw new Error(`no value, but carry value exists`);
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+ }
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+ if ( v === undefined ) continue;
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+ // We have a value, clear the state!
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+ this.state = {};
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+ if ( this.transform ) {
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+ const new_value = await this.transform(
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+ { value: ret.value });
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+ return { ...ret, value: new_value };
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+ }
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+ return { ...ret, value: v };
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+ }
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+ }
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+ async next () {
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+ const ret = await this.next_();
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+ if ( this.observe && !ret.done ) {
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+ this.observe(ret);
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+ }
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+ return ret;
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+ }
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+ async enqueue_ (v) {
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+ this.queue.push(v);
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+ }
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+}
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+
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+const NewCallbackByteStream = () => {
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+ let listener;
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+ let queue = [];
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+ const NOOP = () => {};
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+ let signal = NOOP;
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+ (async () => {
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+ for (;;) {
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+ const v = await new Promise((rslv, rjct) => {
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+ listener = rslv;
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+ });
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+ queue.push(v);
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+ signal();
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+ }
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+ })();
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+ const stream = {
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+ [Symbol.asyncIterator](){
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+ return this;
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+ },
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+ async next () {
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+ if ( queue.length > 0 ) {
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+ return {
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+ value: queue.shift(),
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+ done: false,
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+ };
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+ }
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+ await new Promise(rslv => {
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+ signal = rslv;
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+ });
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+ signal = NOOP;
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+ const v = queue.shift();
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+ return { value: v, done: false };
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+ }
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+ };
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+ stream.listener = data => {
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+ listener(data);
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+ };
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+ return stream;
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+}
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+
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+// Tiny inline little-endian integer library
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+const get_int = (n_bytes, array8, signed=false) => {
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+ return (v => signed ? v : v >>> 0)(
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+ array8.slice(0,n_bytes).reduce((v,e,i)=>v|=e<<8*i,0));
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+}
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+const to_int = (n_bytes, num) => {
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+ return (new Uint8Array()).map((_,i)=>(num>>8*i)&0xFF);
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+}
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+
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+const NewVirtioFrameStream = byteStream => {
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+ return new ATStream({
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+ delegate: byteStream,
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+ async acc ({ value, carry }) {
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+ if ( ! this.state.buffer ) {
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+ const size = get_int(4, value);
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+ // 512MiB limit in case of attempted abuse or a bug
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+ // (assuming this won't happen under normal conditions)
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+ if ( size > 512*(1024**2) ) {
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+ throw new Error(`Way too much data! (${size} bytes)`);
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+ }
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+ value = value.slice(4);
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+ this.state.buffer = new Uint8Array(size);
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+ this.state.index = 0;
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+ }
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+
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+ const needed = this.state.buffer.length - this.state.index;
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+ if ( value.length > needed ) {
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+ const remaining = value.slice(needed);
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+ console.log('we got more bytes than we needed',
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+ needed,
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+ remaining,
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+ value.length,
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+ this.state.buffer.length,
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+ this.state.index,
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+ );
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+ carry(remaining);
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+ }
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+
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+ const amount = Math.min(value.length, needed);
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+ const added = value.slice(0, amount);
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+ this.state.buffer.set(added, this.state.index);
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+ this.state.index += amount;
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+
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+ if ( this.state.index > this.state.buffer.length ) {
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+ throw new Error('WUT');
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+ }
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+ if ( this.state.index == this.state.buffer.length ) {
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+ return this.state.buffer;
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+ }
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+ }
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+ });
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+};
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+
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+const wisp_types = [
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+ {
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+ id: 3,
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+ label: 'CONTINUE',
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+ describe: ({ payload }) => {
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+ return `buffer: ${get_int(4, payload)}B`;
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+ },
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+ getAttributes ({ payload }) {
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+ return {
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+ buffer_size: get_int(4, payload),
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+ };
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+ }
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+ },
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+ {
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+ id: 5,
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+ label: 'INFO',
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+ describe: ({ payload }) => {
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+ return `v${payload[0]}.${payload[1]} ` +
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+ buf2hex(payload.slice(2));
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+ },
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+ getAttributes ({ payload }) {
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+ return {
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+ version_major: payload[0],
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+ version_minor: payload[1],
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+ extensions: payload.slice(2),
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+ }
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+ }
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+ },
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+];
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+
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+class WispPacket {
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+ static SEND = Symbol('SEND');
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+ static RECV = Symbol('RECV');
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+ constructor ({ data, direction, extra }) {
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+ this.direction = direction;
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+ this.data_ = data;
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+ this.extra = extra ?? {};
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+ this.types_ = {
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+ 1: { label: 'CONNECT' },
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+ 2: { label: 'DATA' },
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+ 4: { label: 'CLOSE' },
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+ };
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+ for ( const item of wisp_types ) {
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+ this.types_[item.id] = item;
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+ }
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+ }
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+ get type () {
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+ const i_ = this.data_[0];
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+ return this.types_[i_];
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+ }
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+ get attributes () {
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+ if ( ! this.type.getAttributes ) return {};
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+ const attrs = {};
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+ Object.assign(attrs, this.type.getAttributes({
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+ payload: this.data_.slice(5),
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+ }));
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+ Object.assign(attrs, this.extra);
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+ return attrs;
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+ }
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+ toVirtioFrame () {
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+ const arry = new Uint8Array(this.data_.length + 4);
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+ arry.set(to_int(4, this.data_.length), 0);
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+ arry.set(this.data_, 4);
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+ return arry;
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+ }
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+ describe () {
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+ return this.type.label + '(' +
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+ (this.type.describe?.({
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+ payload: this.data_.slice(5),
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+ }) ?? '?') + ')';
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+ }
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+ log () {
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+ const arrow =
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+ this.direction === this.constructor.SEND ? '->' :
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+ this.direction === this.constructor.RECV ? '<-' :
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+ '<>' ;
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+ console.groupCollapsed(`WISP ${arrow} ${this.describe()}`);
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+ const attrs = this.attributes;
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+ for ( const k in attrs ) {
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+ console.log(k, attrs[k]);
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+ }
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+ console.groupEnd();
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+ }
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+ reflect () {
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+ const reflected = new WispPacket({
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+ data: this.data_,
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+ direction:
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+ this.direction === this.constructor.SEND ?
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+ this.constructor.RECV :
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+ this.direction === this.constructor.RECV ?
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+ this.constructor.SEND :
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+ undefined,
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+ extra: {
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+ reflectedFrom: this,
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+ }
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+ });
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+ return reflected;
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+ }
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+}
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+
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+for ( const item of wisp_types ) {
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+ WispPacket[item.label] = item;
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+}
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+
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+const NewWispPacketStream = frameStream => {
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+ return new ATStream({
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+ delegate: frameStream,
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+ transform ({ value }) {
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+ return new WispPacket({
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+ data: value,
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+ direction: WispPacket.RECV,
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+ });
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+ },
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+ observe ({ value }) {
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+ value.log();
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+ }
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+ });
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+}
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+
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+class WispClient {
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+ constructor ({
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+ packetStream,
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+ sendFn,
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+ }) {
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+ this.packetStream = packetStream;
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+ this.sendFn = sendFn;
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+ }
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+ send (packet) {
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+ packet.log();
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+ this.sendFn(packet);
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+ }
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+}
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+
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+window.onload = async function()
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+{
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+ const resp = await fetch(
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+ './image/build/x86images/rootfs.bin'
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+ );
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+ const arrayBuffer = await resp.arrayBuffer();
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+ var emulator = window.emulator = new V86({
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+ wasm_path: "../build/v86.wasm",
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+ memory_size: 512 * 1024 * 1024,
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+ vga_memory_size: 2 * 1024 * 1024,
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+ screen_container: document.getElementById("screen_container"),
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+ bios: {
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+ url: "../bios/seabios.bin",
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+ },
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+ vga_bios: {
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+ url: "../bios/vgabios.bin",
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+ },
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+
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+ initrd: {
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+ url: './image/build/x86images/boot/initramfs-lts',
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+ },
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+ bzimage: {
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+ url: './image/build/x86images/boot/vmlinuz-lts',
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+ async: false
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+ },
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+ cmdline: 'rw root=/dev/sda init=/sbin/init rootfstype=ext4',
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+ // cmdline: 'rw root=/dev/sda init=/bin/bash rootfstype=ext4',
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+ // cmdline: "rw init=/sbin/init root=/dev/sda rootfstype=ext4",
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+ // cmdline: "rw init=/sbin/init root=/dev/sda rootfstype=ext4 random.trust_cpu=on 8250.nr_uarts=10 spectre_v2=off pti=off mitigations=off",
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+
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+ // cdrom: {
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+ // // url: "../images/al32-2024.07.10.iso",
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+ // url: "./image/build/x86images/rootfs.bin",
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+ // },
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+ hda: {
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+ buffer: arrayBuffer,
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+ // url: './image/build/x86images/rootfs.bin',
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+ async: true,
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+ // size: 1073741824,
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+ // size: 805306368,
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+ },
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+ // bzimage_initrd_from_filesystem: true,
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+ autostart: true,
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+
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+ network_relay_url: "wisp://127.0.0.1:3000",
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+ virtio_console: true,
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+ });
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+
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+
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+ const decoder = new TextDecoder();
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+ const byteStream = NewCallbackByteStream();
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+ emulator.add_listener('virtio-console0-output-bytes',
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+ byteStream.listener);
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+ const virtioStream = NewVirtioFrameStream(byteStream);
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+ const wispStream = NewWispPacketStream(virtioStream);
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+
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+ class PTYManager {
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+ constructor ({ client }) {
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+ this.client = client;
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+ }
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+ init () {
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+ this.run_();
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+ }
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+ async run_ () {
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+ const handlers_ = {
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+ [WispPacket.INFO.id]: ({ packet }) => {
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+ // console.log('guess we doing info packets now', packet);
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+ this.client.send(packet.reflect());
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+ }
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+ };
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+ for await ( const packet of this.client.packetStream ) {
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+ // console.log('what we got here?',
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+ // packet.type,
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+ // packet,
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+ // );
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+ handlers_[packet.type.id]?.({ packet });
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+ }
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+ }
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+ }
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+
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+ const ptyMgr = new PTYManager({
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+ client: new WispClient({
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+ packetStream: wispStream,
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+ sendFn: packet => {
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+ emulator.bus.send(
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+ "virtio-console0-input-bytes",
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+ packet.toVirtioFrame(),
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+ );
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+ }
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+ })
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+ });
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+ ptyMgr.init();
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+}
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+</script>
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+
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+<!-- A minimal structure for the ScreenAdapter defined in browser/screen.js -->
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|
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+<div id="screen_container">
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|
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+ <div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
|
|
|
+ <canvas style="display: none"></canvas>
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|
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+</div>
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KernelDeimos