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Kernel: Allow boot without mouse attached by checking for presence

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This commit is contained in:
Conrad Pankoff 2019-08-12 20:49:17 +10:00 committed by Andreas Kling
parent 8faeead753
commit e60577aab6
Notes: sideshowbarker 2024-07-19 12:43:27 +09:00 
Author: https://github.com/deoxxa
Commit: https://github.com/SerenityOS/serenity/commit/e60577aab61
Pull-request: https://github.com/SerenityOS/serenity/pull/443
2 changed files with 53 additions and 12 deletions
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62
Kernel/Devices/PS2MouseDevice.cpp
View File

@ -10,8 +10,16 @@
#define I8042_MOUSE_BUFFER 0x20
#define I8042_KEYBOARD_BUFFER 0x00
#define PS2MOUSE_SET_RESOLUTION 0xE8
#define PS2MOUSE_STATUS_REQUEST 0xE9
#define PS2MOUSE_REQUEST_SINGLE_PACKET 0xEB
#define PS2MOUSE_GET_DEVICE_ID 0xF2
#define PS2MOUSE_SET_SAMPLE_RATE 0xF3
#define PS2MOUSE_ENABLE_PACKET_STREAMING 0xF4
#define PS2MOUSE_DISABLE_PACKET_STREAMING 0xF5
#define PS2MOUSE_SET_DEFAULTS 0xF6
#define PS2MOUSE_RESEND 0xFE
#define PS2MOUSE_RESET 0xFF
#define PS2MOUSE_INTELLIMOUSE_ID 0x03
@ -128,23 +136,53 @@ u8 PS2MouseDevice::wait_then_read(u8 port)
void PS2MouseDevice::initialize()
{
// Enable PS aux port
wait_then_write(0x64, 0xa8);
wait_then_write(I8042_STATUS, 0xa8);
check_device_presence();
if (m_device_present)
initialize_device();
}
void PS2MouseDevice::check_device_presence()
{
mouse_write(PS2MOUSE_REQUEST_SINGLE_PACKET);
u8 maybe_ack = mouse_read();
if (maybe_ack == I8042_ACK) {
m_device_present = true;
kprintf("PS2MouseDevice: Device detected\n");
// the mouse will send a packet of data, since that's what we asked
// for. we don't care about the content.
mouse_read();
mouse_read();
mouse_read();
} else {
m_device_present = false;
kprintf("PS2MouseDevice: Device not detected\n");
}
}
void PS2MouseDevice::initialize_device()
{
if (!m_device_present)
return;
// Enable interrupts
wait_then_write(0x64, 0x20);
wait_then_write(I8042_STATUS, 0x20);
// Enable the PS/2 mouse IRQ (12).
// NOTE: The keyboard uses IRQ 1 (and is enabled by bit 0 in this register).
u8 status = wait_then_read(0x60) | 2;
wait_then_write(0x64, 0x60);
wait_then_write(0x60, status);
u8 status = wait_then_read(I8042_BUFFER) | 2;
wait_then_write(I8042_STATUS, 0x60);
wait_then_write(I8042_BUFFER, status);
// Set default settings.
mouse_write(0xf6);
mouse_write(PS2MOUSE_SET_DEFAULTS);
expect_ack();
// Enable.
mouse_write(0xf4);
mouse_write(PS2MOUSE_ENABLE_PACKET_STREAMING);
expect_ack();
mouse_write(PS2MOUSE_GET_DEVICE_ID);
@ -190,7 +228,7 @@ void PS2MouseDevice::expect_ack()
void PS2MouseDevice::prepare_for_input()
{
for (;;) {
if (IO::in8(0x64) & 1)
if (IO::in8(I8042_STATUS) & 1)
return;
}
}
@ -198,7 +236,7 @@ void PS2MouseDevice::prepare_for_input()
void PS2MouseDevice::prepare_for_output()
{
for (;;) {
if (!(IO::in8(0x64) & 2))
if (!(IO::in8(I8042_STATUS) & 2))
return;
}
}
@ -206,15 +244,15 @@ void PS2MouseDevice::prepare_for_output()
void PS2MouseDevice::mouse_write(u8 data)
{
prepare_for_output();
IO::out8(0x64, 0xd4);
IO::out8(I8042_STATUS, 0xd4);
prepare_for_output();
IO::out8(0x60, data);
IO::out8(I8042_BUFFER, data);
}
u8 PS2MouseDevice::mouse_read()
{
prepare_for_input();
return IO::in8(0x60);
return IO::in8(I8042_BUFFER);
}
bool PS2MouseDevice::can_read(FileDescription&) const

3
Kernel/Devices/PS2MouseDevice.h
View File

@ -27,6 +27,8 @@ private:
virtual const char* class_name() const override { return "PS2MouseDevice"; }
void initialize();
void check_device_presence();
void initialize_device();
void prepare_for_input();
void prepare_for_output();
void mouse_write(u8);
@ -36,6 +38,7 @@ private:
void parse_data_packet();
void expect_ack();
bool m_device_present { false };
CircularQueue<MousePacket, 100> m_queue;
u8 m_data_state { 0 };
u8 m_data[4];