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https://github.com/RGBCube/serenity
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Kernel: Introduce a new HID subsystem
The end goal of this commit is to allow to boot on bare metal with no PS/2 device connected to the system. It turned out that the original code relied on the existence of the PS/2 keyboard, so VirtualConsole called it even though ACPI indicated the there's no i8042 controller on my real machine because I didn't plug any PS/2 device. The code is much more flexible, so adding HID support for other type of hardware (e.g. USB HID) could be much simpler. Briefly describing the change, we have a new singleton called HIDManagement, which is responsible to initialize the i8042 controller if exists, and to enumerate its devices. I also abstracted a bit things, so now every Human interface device is represented with the HIDDevice class. Then, there are 2 types of it - the MouseDevice and KeyboardDevice classes; both are responsible to handle the interface in the DevFS. PS2KeyboardDevice, PS2MouseDevice and VMWareMouseDevice classes are responsible for handling the hardware-specific interface they are assigned to. Therefore, they are inheriting from the IRQHandler class.
This commit is contained in:
Liav A
Andreas Kling
parent
32dd9c554b
commit
8e3e3a71cb
23 changed files with 942 additions and 410 deletions
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/*
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* Copyright (c) 2020, The SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/ACPI/Parser.h>
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#include <Kernel/Devices/KeyboardDevice.h>
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#include <Kernel/Devices/PS2MouseDevice.h>
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#include <Kernel/IO.h>
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namespace Kernel {
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static I8042Controller* s_the;
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UNMAP_AFTER_INIT void I8042Controller::initialize()
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{
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if (ACPI::Parser::the()->have_8042())
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new I8042Controller;
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}
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I8042Controller& I8042Controller::the()
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{
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VERIFY(s_the);
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return *s_the;
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}
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UNMAP_AFTER_INIT I8042Controller::I8042Controller()
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{
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VERIFY(!s_the);
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s_the = this;
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u8 configuration;
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{
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ScopedSpinLock lock(m_lock);
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// Disable devices
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do_wait_then_write(I8042_STATUS, 0xad);
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do_wait_then_write(I8042_STATUS, 0xa7); // ignored if it doesn't exist
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// Drain buffers
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do_drain();
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do_wait_then_write(I8042_STATUS, 0x20);
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configuration = do_wait_then_read(I8042_BUFFER);
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do_wait_then_write(I8042_STATUS, 0x60);
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configuration &= ~3; // Disable IRQs for all
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do_wait_then_write(I8042_BUFFER, configuration);
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m_is_dual_channel = (configuration & (1 << 5)) != 0;
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dbgln("I8042: {} channel controller",
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m_is_dual_channel ? "Dual" : "Single");
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// Perform controller self-test
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do_wait_then_write(I8042_STATUS, 0xaa);
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if (do_wait_then_read(I8042_BUFFER) == 0x55) {
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// Restore configuration in case the controller reset
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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} else {
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dbgln("I8042: Controller self test failed");
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}
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// Test ports and enable them if available
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do_wait_then_write(I8042_STATUS, 0xab); // test
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m_devices[0].available = (do_wait_then_read(I8042_BUFFER) == 0);
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if (m_devices[0].available) {
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do_wait_then_write(I8042_STATUS, 0xae); //enable
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configuration |= 1;
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configuration &= ~(1 << 4);
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} else {
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dbgln("I8042: Keyboard port not available");
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}
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if (m_is_dual_channel) {
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do_wait_then_write(I8042_STATUS, 0xa9); // test
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m_devices[1].available = (do_wait_then_read(I8042_BUFFER) == 0);
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if (m_devices[1].available) {
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do_wait_then_write(I8042_STATUS, 0xa8); // enable
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configuration |= 2;
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configuration &= ~(1 << 5);
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} else {
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dbgln("I8042: Mouse port not available");
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}
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}
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// Enable IRQs for the ports that are usable
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if (m_devices[0].available || m_devices[1].available) {
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configuration &= ~0x30; // renable clocks
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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// Try to detect and initialize the devices
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if (m_devices[0].available) {
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if (KeyboardDevice::the().initialize()) {
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m_devices[0].device = &KeyboardDevice::the();
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} else {
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dbgln("I8042: Keyboard device failed to initialize, disable");
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m_devices[0].available = false;
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configuration &= ~1;
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configuration |= 1 << 4;
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ScopedSpinLock lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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if (m_devices[1].available) {
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if (PS2MouseDevice::the().initialize()) {
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m_devices[1].device = &PS2MouseDevice::the();
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} else {
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dbgln("I8042: Mouse device failed to initialize, disable");
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m_devices[1].available = false;
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configuration |= 1 << 5;
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ScopedSpinLock lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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// Enable IRQs after both are detected and initialized
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if (m_devices[0].device)
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m_devices[0].device->enable_interrupts();
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if (m_devices[1].device)
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m_devices[1].device->enable_interrupts();
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}
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void I8042Controller::irq_process_input_buffer(Device)
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{
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VERIFY(Processor::current().in_irq());
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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return;
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Device data_for_device = ((status & I8042_WHICH_BUFFER) == I8042_MOUSE_BUFFER) ? Device::Mouse : Device::Keyboard;
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u8 byte = IO::in8(I8042_BUFFER);
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if (auto* device = m_devices[data_for_device == Device::Keyboard ? 0 : 1].device)
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device->irq_handle_byte_read(byte);
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}
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void I8042Controller::do_drain()
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{
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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return;
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IO::in8(I8042_BUFFER);
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}
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}
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bool I8042Controller::do_reset_device(Device device)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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if (do_send_command(device, 0xff) != I8042_ACK)
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return false;
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// Wait until we get the self-test result
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return do_wait_then_read(I8042_BUFFER) == 0xaa;
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}
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u8 I8042Controller::do_send_command(Device device, u8 command)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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return do_write_to_device(device, command);
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}
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u8 I8042Controller::do_send_command(Device device, u8 command, u8 data)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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u8 response = do_write_to_device(device, command);
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if (response == I8042_ACK)
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response = do_write_to_device(device, data);
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return response;
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}
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u8 I8042Controller::do_write_to_device(Device device, u8 data)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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int attempts = 0;
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u8 response;
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do {
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if (device != Device::Keyboard) {
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prepare_for_output();
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IO::out8(I8042_STATUS, 0xd4);
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}
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prepare_for_output();
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IO::out8(I8042_BUFFER, data);
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response = do_wait_then_read(I8042_BUFFER);
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} while (response == I8042_RESEND && ++attempts < 3);
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if (attempts >= 3)
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dbgln("Failed to write byte to device, gave up");
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return response;
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}
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u8 I8042Controller::do_read_from_device(Device device)
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{
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VERIFY(device != Device::None);
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prepare_for_input(device);
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return IO::in8(I8042_BUFFER);
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}
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void I8042Controller::prepare_for_input(Device device)
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{
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VERIFY(m_lock.is_locked());
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const u8 buffer_type = device == Device::Keyboard ? I8042_KEYBOARD_BUFFER : I8042_MOUSE_BUFFER;
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if ((status & I8042_BUFFER_FULL) && (device == Device::None || ((status & I8042_WHICH_BUFFER) == buffer_type)))
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return;
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}
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}
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void I8042Controller::prepare_for_output()
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{
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VERIFY(m_lock.is_locked());
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for (;;) {
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if (!(IO::in8(I8042_STATUS) & 2))
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return;
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}
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}
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void I8042Controller::do_wait_then_write(u8 port, u8 data)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_output();
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IO::out8(port, data);
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}
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u8 I8042Controller::do_wait_then_read(u8 port)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_input(Device::None);
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return IO::in8(port);
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}
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}
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