Mouse support

.eslintrc

@@ -41,6 +41,7 @@ rules:
     - 2
     -
       props: false
+  no-shadow: 0
 
 parserOptions:
   ecmaVersion: 6

js/core/index.js

@@ -19,6 +19,7 @@ require('./polyfill');
 
 const random = require('./random');
 const keyboard = require('./keyboard');
+const mouse = require('./mouse');
 const ps2 = require('./ps2');
 const pci = require('./pci');
 const net = require('./net');
@@ -29,6 +30,7 @@ class Runtime {
     Object.assign(this, {
       random,
       keyboard,
+      mouse,
       pci,
       ps2,
       allocator,

js/core/mouse/index.js

@@ -0,0 +1,20 @@
+// Copyright 2016-present runtime.js project authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+const EventController = require('event-controller');
+exports.onMousedown = new EventController();
+exports.onMouseup = new EventController();
+exports.onMousemove = new EventController();

js/core/ps2/index.js

@@ -26,3 +26,13 @@ exports.setKeyboardDriver = (driver) => {
     ioPort: driverUtils.ioPort(0x60),
   });
 };
+
+exports.setMouseDriver = (driver) => {
+  assert(typeutils.isFunction(driver.init));
+  assert(typeutils.isFunction(driver.reset));
+
+  driver.init({
+    irq: driverUtils.irq(12),
+    ioPorts: [driverUtils.ioPort(0x60), driverUtils.ioPort(0x64)],
+  });
+};

js/driver/ps2/index.js

@@ -14,3 +14,4 @@
 
 'use strict';
 require('./keyboard');
+require('./mouse');

js/driver/ps2/mouse.js

@@ -0,0 +1,196 @@
+// Copyright 2016-present runtime.js project authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Some code modified and adapted for use by runtime.js from http://forum.osdev.org/viewtopic.php?t=10247
+
+'use strict';
+
+const runtime = require('../../core');
+
+const flags = {
+  middle: false,
+  right: false,
+  left: false,
+};
+
+function splitByte(byte) {
+  const ret = [];
+  for (let i = 7; i >= 0; i--) ret.push(byte & (1 << i) ? 1 : 0);
+  return ret;
+}
+
+function processPacket(packet) {
+  const split = splitByte(packet[0]);
+  const info = {
+    yOverflow: split[0],
+    xOverflow: split[1],
+    ySign: split[2],
+    xSign: split[3],
+    alwaysOne: split[4],
+    buttons: {
+      middle: split[5],
+      right: split[6],
+      left: split[7],
+    },
+    xOffset: packet[1],
+    yOffset: packet[2],
+  };
+
+  // just a sanity check:
+  if (info.alwaysOne !== 1) return; // something's wrong with this packet
+
+  if (flags.middle && info.buttons.middle === 0) {
+    flags.middle = false;
+    setImmediate(() => {
+      runtime.mouse.onMouseup.dispatch(1);
+    });
+  } else if (!flags.middle && info.buttons.middle === 1) {
+    flags.middle = true;
+    setImmediate(() => {
+      runtime.mouse.onMousedown.dispatch(1);
+    });
+  } else if (flags.right && info.buttons.right === 0) {
+    flags.right = false;
+    setImmediate(() => {
+      runtime.mouse.onMouseup.dispatch(2);
+    });
+  } else if (!flags.right && info.buttons.right === 1) {
+    flags.right = true;
+    setImmediate(() => {
+      runtime.mouse.onMousedown.dispatch(2);
+    });
+  } else if (flags.left && info.buttons.left === 0) {
+    flags.left = false;
+    setImmediate(() => {
+      runtime.mouse.onMouseup.dispatch(0);
+    });
+  } else if (!flags.left && info.buttons.left === 1) {
+    flags.left = true;
+    setImmediate(() => {
+      runtime.mouse.onMousedown.dispatch(0);
+    });
+  }
+
+  if (info.xOffset !== 0 || info.yOffset !== 0) {
+    setImmediate(() => {
+      runtime.mouse.onMousemove.dispatch({
+        x: (info.xSign) ? (info.xOffset | 0xffffff00) : info.xOffset,
+        y: (info.ySign) ? (info.yOffset | 0xffffff00) : info.yOffset,
+      });
+    });
+  }
+}
+
+const driver = {
+  init(device) {
+    const irq = device.irq;
+    const [mainPort, port64] = device.ioPorts;
+
+    function mouseWait(type) {
+      return new Promise((resolve, reject) => {
+        let maxIter = 1500;
+        function loop() {
+          return new Promise((resolve, reject) => {
+            if (maxIter === 0) return resolve();
+            if (type === 0) {
+              if ((port64.read8() & 1) === 1) {
+                return resolve();
+              }
+            } else {
+              if ((port64.read8() & 2) === 0) {
+                return resolve();
+              }
+            }
+            maxIter--;
+            setImmediate(() => {
+              loop().then(resolve).catch(reject);
+            });
+          });
+        }
+        setImmediate(() => {
+          loop().then(resolve).catch(reject);
+        });
+      });
+    }
+
+    function mouseWrite(data) {
+      return new Promise((resolve, reject) => {
+        mouseWait(1).then(() => {
+          port64.write8(0xd4);
+          return mouseWait(1);
+        }).then(() => {
+          mainPort.write8(data);
+          resolve();
+        }).catch(reject);
+      });
+    }
+
+    function mouseRead() {
+      return new Promise((resolve, reject) => {
+        mouseWait(0).then(() => {
+          resolve(mainPort.read8());
+        }).catch(reject);
+      });
+    }
+
+    let status;
+
+    /* eslint-disable newline-per-chained-call */
+    mouseWait(1).then(() => {
+      port64.write8(0xa8); // enable the aux mouse device
+      return mouseWait(1);
+    }).then(() => {
+      port64.write8(0x20); // use interupts
+      return mouseWait(0);
+    }).then(() => {
+      status = (mainPort.read8() | 2);
+      return mouseWait(1);
+    }).then(() => {
+      port64.write8(0x60);
+      return mouseWait(1); // end use interupts
+    }).then(() => {
+      mainPort.write8(status);
+      return mouseWrite(0xf6); // use defaults
+    })
+    .then(() => mouseRead()) // ACK
+    .then(() => mouseWrite(0xf4)) // enable the mouse
+    .then(() => mouseRead()) // ACK
+    .then(() => {
+      let cycle = 0;
+      let packet = [];
+      irq.on(() => {
+        if (cycle === 0) {
+          packet = [];
+          packet[0] = mainPort.read8();
+          cycle++;
+        } else if (cycle === 1) {
+          packet[1] = mainPort.read8();
+          cycle++;
+        } else if (cycle === 2) {
+          packet[2] = mainPort.read8();
+          cycle = 0;
+          ((packet) => {
+            setImmediate(() => {
+              processPacket(packet);
+            });
+          })(packet);
+        }
+      });
+    });
+    /* eslint-enable newline-per-chained-call */
+  },
+  reset() {},
+};
+
+runtime.ps2.setMouseDriver(driver);