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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Devices/CharacterDevice.h>
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namespace Kernel {
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class SerialDevice final : public CharacterDevice {
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AK_MAKE_ETERNAL
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friend class DeviceManagement;
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public:
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static NonnullRefPtr<SerialDevice> must_create(size_t com_number);
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virtual ~SerialDevice() override;
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// ^CharacterDevice
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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void put_char(char);
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enum InterruptEnable {
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LowPowerMode = 0x01 << 5,
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SleepMode = 0x01 << 4,
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ModemStatusInterrupt = 0x01 << 3,
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ReceiverLineStatusInterrupt = 0x01 << 2,
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TransmitterHoldingRegisterEmptyInterrupt = 0x01 << 1,
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ReceivedDataAvailableInterrupt = 0x01 << 0
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};
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enum Baud {
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Baud50 = 2304,
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Baud110 = 1047,
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Baud220 = 524,
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Baud300 = 384,
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Baud600 = 192,
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Baud1200 = 96,
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Baud2400 = 48,
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Baud4800 = 24,
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Baud9600 = 12,
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Baud19200 = 6,
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Baud38400 = 3,
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Baud57600 = 2,
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Baud115200 = 1
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};
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enum ParitySelect {
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None = 0x00 << 3,
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Odd = 0x01 << 3,
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Even = 0x03 << 3,
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Mark = 0x05 << 3,
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Space = 0x07 << 3
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};
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enum StopBits {
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One = 0x00 << 2,
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Two = 0x01 << 2
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};
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enum WordLength {
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FiveBits = 0x00,
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SixBits = 0x01,
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SevenBits = 0x02,
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EightBits = 0x03
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};
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enum FIFOControl {
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EnableFIFO = 0x01 << 0,
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ClearReceiveFIFO = 0x01 << 1,
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ClearTransmitFIFO = 0x01 << 2,
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Enable64ByteFIFO = 0x01 << 5,
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TriggerLevel1 = 0x00 << 6,
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TriggerLevel2 = 0x01 << 6,
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TriggerLevel3 = 0x02 << 6,
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TriggerLevel4 = 0x03 << 6
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};
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enum ModemControl {
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AutoflowControlEnabled = 0x01 << 5,
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LoopbackMode = 0x01 << 4,
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AuxiliaryOutput2 = 0x01 << 3,
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AuxiliaryOutput1 = 0x01 << 2,
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RequestToSend = 0x01 << 1,
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DataTerminalReady = 0x01 << 0
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};
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enum LineStatus {
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ErrorInReceivedFIFO = 0x01 << 7,
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EmptyDataHoldingRegisters = 0x01 << 6,
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EmptyTransmitterHoldingRegister = 0x01 << 5,
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BreakInterrupt = 0x01 << 4,
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FramingError = 0x01 << 3,
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ParityError = 0x01 << 2,
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OverrunError = 0x01 << 1,
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DataReady = 0x01 << 0
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};
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private:
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SerialDevice(IOAddress base_addr, unsigned minor);
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friend class PCISerialDevice;
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// ^CharacterDevice
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virtual StringView class_name() const override { return "SerialDevice"sv; }
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void initialize();
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void set_interrupts(bool interrupt_enable);
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void set_baud(Baud);
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void set_fifo_control(u8 fifo_control);
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void set_line_control(ParitySelect, StopBits, WordLength);
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void set_break_enable(bool break_enable);
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void set_modem_control(u8 modem_control);
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u8 get_line_status() const;
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IOAddress m_base_addr;
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bool m_interrupt_enable { false };
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u8 m_fifo_control { 0 };
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Baud m_baud { Baud38400 };
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ParitySelect m_parity_select { None };
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StopBits m_stop_bits { One };
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WordLength m_word_length { EightBits };
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bool m_break_enable { false };
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u8 m_modem_control { 0 };
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bool m_last_put_char_was_carriage_return { false };
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Spinlock m_serial_lock;
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};
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}
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