| // Copyright 2017 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| use sys_util::EventFd; |
| |
| use BusDevice; |
| |
| /// A i8042 PS/2 controller that emulates just enough to shutdown the machine. |
| pub struct I8042Device { |
| reset_evt: EventFd, |
| } |
| |
| impl I8042Device { |
| /// Constructs a i8042 device that will signal the given event when the guest requests it. |
| pub fn new(reset_evt: EventFd) -> I8042Device { |
| I8042Device { reset_evt } |
| } |
| } |
| |
| // i8042 device is mapped I/O address 0x61. We partially implement two 8-bit |
| // registers: port 0x61 (I8042_PORT_B_REG, offset 0 from base of 0x61), and |
| // port 0x64 (I8042_COMMAND_REG, offset 3 from base of 0x61). |
| impl BusDevice for I8042Device { |
| fn debug_label(&self) -> String { |
| "i8042".to_owned() |
| } |
| |
| fn read(&mut self, offset: u64, data: &mut [u8]) { |
| if data.len() == 1 && offset == 3 { |
| data[0] = 0x0; |
| } else if data.len() == 1 && offset == 0 { |
| // Like kvmtool, we return bit 5 set in I8042_PORT_B_REG to |
| // avoid hang in pit_calibrate_tsc() in Linux kernel. |
| data[0] = 0x20; |
| } |
| } |
| |
| fn write(&mut self, offset: u64, data: &[u8]) { |
| if data.len() == 1 && data[0] == 0xfe && offset == 3 { |
| if let Err(e) = self.reset_evt.write(1) { |
| error!("failed to trigger i8042 reset event: {}", e); |
| } |
| } |
| } |
| } |