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This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow, UserOrKernelBuffer and ScopedCritical classes being moved to the Kernel/Library subdirectory. Also, move the panic and assertions handling code to that directory.
140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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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/SerialDevice.h>
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#include <Kernel/Library/IOWindow.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT SerialDevice::SerialDevice(NonnullOwnPtr<IOWindow> registers_io_window, unsigned minor)
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: CharacterDevice(4, minor)
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, m_registers_io_window(move(registers_io_window))
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{
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initialize();
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}
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UNMAP_AFTER_INIT SerialDevice::~SerialDevice() = default;
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bool SerialDevice::can_read(OpenFileDescription const&, u64) const
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{
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return (get_line_status() & DataReady) != 0;
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}
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ErrorOr<size_t> SerialDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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if (!size)
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return 0;
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SpinlockLocker lock(m_serial_lock);
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if (!(get_line_status() & DataReady))
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return 0;
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return buffer.write_buffered<128>(size, [&](Bytes bytes) {
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for (auto& byte : bytes)
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byte = m_registers_io_window->read8(0);
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return bytes.size();
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});
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}
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bool SerialDevice::can_write(OpenFileDescription const&, u64) const
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{
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return (get_line_status() & EmptyTransmitterHoldingRegister) != 0;
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}
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ErrorOr<size_t> SerialDevice::write(OpenFileDescription& description, u64, UserOrKernelBuffer const& buffer, size_t size)
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{
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if (!size)
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return 0;
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SpinlockLocker lock(m_serial_lock);
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if (!can_write(description, size))
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return EAGAIN;
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return buffer.read_buffered<128>(size, [&](ReadonlyBytes bytes) {
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for (const auto& byte : bytes)
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put_char(byte);
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return bytes.size();
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});
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}
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void SerialDevice::put_char(char ch)
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{
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while ((get_line_status() & EmptyTransmitterHoldingRegister) == 0)
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;
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if (ch == '\n' && !m_last_put_char_was_carriage_return)
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m_registers_io_window->write8(0, '\r');
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m_registers_io_window->write8(0, ch);
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m_last_put_char_was_carriage_return = (ch == '\r');
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}
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UNMAP_AFTER_INIT void SerialDevice::initialize()
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{
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set_interrupts(false);
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set_baud(Baud38400);
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set_line_control(None, One, EightBits);
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set_fifo_control(EnableFIFO | ClearReceiveFIFO | ClearTransmitFIFO | TriggerLevel4);
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set_modem_control(RequestToSend | DataTerminalReady);
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}
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UNMAP_AFTER_INIT void SerialDevice::set_interrupts(bool interrupt_enable)
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{
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m_interrupt_enable = interrupt_enable;
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m_registers_io_window->write8(1, interrupt_enable);
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}
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void SerialDevice::set_baud(Baud baud)
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{
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m_baud = baud;
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m_registers_io_window->write8(3, m_registers_io_window->read8(3) | 0x80); // turn on DLAB
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m_registers_io_window->write8(0, ((u8)(baud)) & 0xff); // lower half of divisor
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m_registers_io_window->write8(1, ((u8)(baud)) >> 2); // lower half of divisor
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m_registers_io_window->write8(3, m_registers_io_window->read8(3) & 0x7f); // turn off DLAB
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}
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void SerialDevice::set_fifo_control(u8 fifo_control)
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{
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m_fifo_control = fifo_control;
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m_registers_io_window->write8(2, fifo_control);
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}
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void SerialDevice::set_line_control(ParitySelect parity_select, StopBits stop_bits, WordLength word_length)
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{
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m_parity_select = parity_select;
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m_stop_bits = stop_bits;
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m_word_length = word_length;
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m_registers_io_window->write8(3, (m_registers_io_window->read8(3) & ~0x3f) | parity_select | stop_bits | word_length);
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}
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void SerialDevice::set_break_enable(bool break_enable)
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{
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m_break_enable = break_enable;
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m_registers_io_window->write8(3, m_registers_io_window->read8(3) & (break_enable ? 0xff : 0xbf));
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}
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void SerialDevice::set_modem_control(u8 modem_control)
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{
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m_modem_control = modem_control;
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m_registers_io_window->write8(4, modem_control);
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}
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u8 SerialDevice::get_line_status() const
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{
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return m_registers_io_window->read8(5);
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}
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}
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