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1b2ef8582c
Asking a File if we could possibly read or write it will never mutate the asking FileDescription&, so it should be const.
282 lines
6.4 KiB
C++
282 lines
6.4 KiB
C++
#include "PS2MouseDevice.h"
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#include "IO.h"
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#define IRQ_MOUSE 1
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#define I8042_BUFFER 0x60
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#define I8042_STATUS 0x64
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#define I8042_ACK 0xFA
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#define I8042_BUFFER_FULL 0x01
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#define I8042_WHICH_BUFFER 0x20
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#define I8042_MOUSE_BUFFER 0x20
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#define I8042_KEYBOARD_BUFFER 0x00
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#define PS2MOUSE_SET_RESOLUTION 0xE8
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#define PS2MOUSE_STATUS_REQUEST 0xE9
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#define PS2MOUSE_REQUEST_SINGLE_PACKET 0xEB
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#define PS2MOUSE_GET_DEVICE_ID 0xF2
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#define PS2MOUSE_SET_SAMPLE_RATE 0xF3
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#define PS2MOUSE_ENABLE_PACKET_STREAMING 0xF4
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#define PS2MOUSE_DISABLE_PACKET_STREAMING 0xF5
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#define PS2MOUSE_SET_DEFAULTS 0xF6
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#define PS2MOUSE_RESEND 0xFE
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#define PS2MOUSE_RESET 0xFF
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#define PS2MOUSE_INTELLIMOUSE_ID 0x03
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//#define PS2MOUSE_DEBUG
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static PS2MouseDevice* s_the;
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PS2MouseDevice::PS2MouseDevice()
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: IRQHandler(12)
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, CharacterDevice(10, 1)
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{
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s_the = this;
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initialize();
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}
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PS2MouseDevice::~PS2MouseDevice()
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{
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}
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PS2MouseDevice& PS2MouseDevice::the()
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{
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return *s_the;
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}
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void PS2MouseDevice::handle_irq()
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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_WHICH_BUFFER) == I8042_MOUSE_BUFFER) && (status & I8042_BUFFER_FULL)))
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return;
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u8 data = IO::in8(I8042_BUFFER);
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m_data[m_data_state] = data;
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auto commit_packet = [&] {
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m_data_state = 0;
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#ifdef PS2MOUSE_DEBUG
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dbgprintf("PS2Mouse: %d, %d %s %s (buffered: %u)\n",
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m_data[1],
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m_data[2],
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(m_data[0] & 1) ? "Left" : "",
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(m_data[0] & 2) ? "Right" : "",
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m_queue.size());
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#endif
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parse_data_packet();
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};
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switch (m_data_state) {
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case 0:
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if (!(data & 0x08)) {
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dbgprintf("PS2Mouse: Stream out of sync.\n");
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break;
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}
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++m_data_state;
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break;
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case 1:
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++m_data_state;
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break;
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case 2:
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if (m_has_wheel) {
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++m_data_state;
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break;
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}
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commit_packet();
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break;
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case 3:
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ASSERT(m_has_wheel);
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commit_packet();
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break;
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}
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}
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}
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void PS2MouseDevice::parse_data_packet()
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{
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int x = m_data[1];
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int y = m_data[2];
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int z = 0;
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if (m_has_wheel)
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z = (char)m_data[3];
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bool x_overflow = m_data[0] & 0x40;
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bool y_overflow = m_data[0] & 0x80;
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bool x_sign = m_data[0] & 0x10;
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bool y_sign = m_data[0] & 0x20;
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if (x && x_sign)
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x -= 0x100;
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if (y && y_sign)
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y -= 0x100;
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if (x_overflow || y_overflow) {
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x = 0;
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y = 0;
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}
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MousePacket packet;
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packet.dx = x;
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packet.dy = y;
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packet.dz = z;
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packet.buttons = m_data[0] & 0x07;
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m_queue.enqueue(packet);
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}
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void PS2MouseDevice::wait_then_write(u8 port, u8 data)
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{
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prepare_for_output();
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IO::out8(port, data);
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}
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u8 PS2MouseDevice::wait_then_read(u8 port)
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{
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prepare_for_input();
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return IO::in8(port);
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}
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void PS2MouseDevice::initialize()
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{
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// Enable PS aux port
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wait_then_write(I8042_STATUS, 0xa8);
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check_device_presence();
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if (m_device_present)
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initialize_device();
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}
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void PS2MouseDevice::check_device_presence()
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{
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mouse_write(PS2MOUSE_REQUEST_SINGLE_PACKET);
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u8 maybe_ack = mouse_read();
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if (maybe_ack == I8042_ACK) {
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m_device_present = true;
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kprintf("PS2MouseDevice: Device detected\n");
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// the mouse will send a packet of data, since that's what we asked
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// for. we don't care about the content.
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mouse_read();
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mouse_read();
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mouse_read();
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} else {
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m_device_present = false;
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kprintf("PS2MouseDevice: Device not detected\n");
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}
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}
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void PS2MouseDevice::initialize_device()
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{
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if (!m_device_present)
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return;
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// Enable interrupts
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wait_then_write(I8042_STATUS, 0x20);
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// Enable the PS/2 mouse IRQ (12).
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// NOTE: The keyboard uses IRQ 1 (and is enabled by bit 0 in this register).
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u8 status = wait_then_read(I8042_BUFFER) | 2;
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wait_then_write(I8042_STATUS, 0x60);
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wait_then_write(I8042_BUFFER, status);
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// Set default settings.
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mouse_write(PS2MOUSE_SET_DEFAULTS);
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expect_ack();
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// Enable.
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mouse_write(PS2MOUSE_ENABLE_PACKET_STREAMING);
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expect_ack();
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mouse_write(PS2MOUSE_GET_DEVICE_ID);
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expect_ack();
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u8 device_id = mouse_read();
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if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
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// Send magical wheel initiation sequence.
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mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
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expect_ack();
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mouse_write(200);
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expect_ack();
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mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
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expect_ack();
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mouse_write(100);
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expect_ack();
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mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
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expect_ack();
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mouse_write(80);
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expect_ack();
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mouse_write(PS2MOUSE_GET_DEVICE_ID);
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expect_ack();
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device_id = mouse_read();
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}
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if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
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m_has_wheel = true;
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kprintf("PS2MouseDevice: Mouse wheel enabled!\n");
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} else {
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kprintf("PS2MouseDevice: No mouse wheel detected!\n");
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}
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enable_irq();
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}
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void PS2MouseDevice::expect_ack()
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{
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u8 data = mouse_read();
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ASSERT(data == I8042_ACK);
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}
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void PS2MouseDevice::prepare_for_input()
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{
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for (;;) {
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if (IO::in8(I8042_STATUS) & 1)
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return;
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}
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}
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void PS2MouseDevice::prepare_for_output()
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{
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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 PS2MouseDevice::mouse_write(u8 data)
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{
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prepare_for_output();
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IO::out8(I8042_STATUS, 0xd4);
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prepare_for_output();
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IO::out8(I8042_BUFFER, data);
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}
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u8 PS2MouseDevice::mouse_read()
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{
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prepare_for_input();
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return IO::in8(I8042_BUFFER);
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}
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bool PS2MouseDevice::can_read(const FileDescription&) const
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{
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return !m_queue.is_empty();
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}
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ssize_t PS2MouseDevice::read(FileDescription&, u8* buffer, ssize_t size)
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{
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ssize_t nread = 0;
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while (nread < size) {
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if (m_queue.is_empty())
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break;
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// Don't return partial data frames.
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if ((size - nread) < (ssize_t)sizeof(MousePacket))
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break;
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auto packet = m_queue.dequeue();
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memcpy(buffer, &packet, sizeof(MousePacket));
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nread += sizeof(MousePacket);
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}
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return nread;
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}
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ssize_t PS2MouseDevice::write(FileDescription&, const u8*, ssize_t)
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{
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return 0;
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}
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