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968902dfec
These statements are useful for understanding the cause of reset or shutdown of the VM and are not spammy so should be included at info!() level. Signed-off-by: Rob Bradford <robert.bradford@intel.com>
46 lines
1.6 KiB
Rust
46 lines
1.6 KiB
Rust
// Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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use std::sync::{Arc, Barrier};
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use vm_device::BusDevice;
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use vmm_sys_util::eventfd::EventFd;
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/// A i8042 PS/2 controller that emulates just enough to shutdown the machine.
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pub struct I8042Device {
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reset_evt: EventFd,
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}
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impl I8042Device {
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/// Constructs a i8042 device that will signal the given event when the guest requests it.
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pub fn new(reset_evt: EventFd) -> I8042Device {
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I8042Device { reset_evt }
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}
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}
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// i8042 device is located at I/O port 0x61. We partially implement two 8-bit
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// registers: port 0x61 (I8042_PORT_B_REG, offset 0 from base of 0x61), and
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// port 0x64 (I8042_COMMAND_REG, offset 3 from base of 0x61).
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impl BusDevice for I8042Device {
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fn read(&mut self, _base: u64, offset: u64, data: &mut [u8]) {
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if data.len() == 1 && offset == 3 {
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data[0] = 0x0;
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} else if data.len() == 1 && offset == 0 {
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// Like kvmtool, we return bit 5 set in I8042_PORT_B_REG to
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// avoid hang in pit_calibrate_tsc() in Linux kernel.
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data[0] = 0x20;
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}
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}
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fn write(&mut self, _base: u64, offset: u64, data: &[u8]) -> Option<Arc<Barrier>> {
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if data.len() == 1 && data[0] == 0xfe && offset == 3 {
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info!("i8042 reset signalled");
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if let Err(e) = self.reset_evt.write(1) {
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error!("Error triggering i8042 reset event: {}", e);
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}
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}
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None
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}
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}
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