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https://github.com/SerenityOS/serenity
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61 lines
2 KiB
C++
61 lines
2 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/HID/VMWareMouseDevice.h>
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#include <Kernel/Firmware/Hypervisor/VMWareBackdoor.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<VMWareMouseDevice>> VMWareMouseDevice::try_to_initialize(I8042Controller const& ps2_controller)
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{
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// FIXME: return the correct error
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if (!VMWareBackdoor::the())
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return Error::from_errno(EIO);
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if (!VMWareBackdoor::the()->vmmouse_is_absolute())
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return Error::from_errno(EIO);
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auto mouse_device = TRY(DeviceManagement::try_create_device<VMWareMouseDevice>(ps2_controller));
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TRY(mouse_device->initialize());
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return mouse_device;
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}
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void VMWareMouseDevice::irq_handle_byte_read(u8)
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{
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auto backdoor = VMWareBackdoor::the();
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VERIFY(backdoor);
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VERIFY(backdoor->vmmouse_is_absolute());
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// We will receive 4 bytes from the I8042 controller that we are going to
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// ignore. Instead, we will check with VMWareBackdoor to see how many bytes
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// of mouse event data are waiting for us. For each multiple of 4, we
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// produce a mouse packet.
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constexpr u8 max_iterations = 128;
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u8 current_iteration = 0;
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while (++current_iteration < max_iterations) {
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auto number_of_mouse_event_bytes = backdoor->read_mouse_status_queue_size();
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if (number_of_mouse_event_bytes == 0)
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break;
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VERIFY(number_of_mouse_event_bytes % 4 == 0);
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auto mouse_packet = backdoor->receive_mouse_packet();
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m_entropy_source.add_random_event(mouse_packet);
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{
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SpinlockLocker lock(m_queue_lock);
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m_queue.enqueue(mouse_packet);
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}
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}
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evaluate_block_conditions();
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}
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VMWareMouseDevice::VMWareMouseDevice(I8042Controller const& ps2_controller)
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: PS2MouseDevice(ps2_controller)
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{
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}
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VMWareMouseDevice::~VMWareMouseDevice() = default;
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}
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