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29f9a38f76
Instead, try to create the device objects in separate static methods, and if we fail for some odd reason to allocate memory for such devices, just panic with that reason.
140 lines
3.7 KiB
C++
140 lines
3.7 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/Devices/CharacterDevice.h>
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#include <Kernel/IO.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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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 FileDescription&, size_t) const override;
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> write(FileDescription&, 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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// ^Device
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virtual mode_t required_mode() const override { return 0620; }
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virtual String device_name() const override;
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private:
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friend class PCISerialDevice;
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SerialDevice(IOAddress base_addr, unsigned minor);
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// ^CharacterDevice
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virtual const char* class_name() const override { return "SerialDevice"; }
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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<u8> m_serial_lock;
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};
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}
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