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https://github.com/LadybirdBrowser/ladybird.git
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208cfcb0a5
This commit adds support for initializing multiple serial ports per PCI board, as well as initializing multiple different pci serial boards Currently we just choose the first PCI serial port seen as the debug port, but this should probably be made configurable some how in the future.
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/*
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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/PCISerialDevice.h>
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namespace Kernel {
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static SerialDevice* s_the = nullptr;
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void PCISerialDevice::detect()
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{
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size_t current_device_minor = 68;
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PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
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if (address.is_null())
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return;
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for (auto& board_definition : board_definitions) {
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if (board_definition.device_id != id)
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continue;
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auto bar_base = PCI::get_BAR(address, board_definition.pci_bar) & ~1;
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auto port_base = IOAddress(bar_base + board_definition.first_offset);
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for (size_t i = 0; i < board_definition.port_count; i++) {
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auto serial_device = new SerialDevice(port_base.offset(board_definition.port_size * i), current_device_minor++);
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if (board_definition.baud_rate != SerialDevice::Baud::Baud38400) // non-default baud
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serial_device->set_baud(board_definition.baud_rate);
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// If this is the first port of the first pci serial device, store it as the debug PCI serial port (TODO: Make this configurable somehow?)
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if (!is_available())
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s_the = serial_device;
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// NOTE: We intentionally leak the reference to serial_device here, as it is eternal
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}
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dmesgln("PCISerialDevice: Found {} @ {}", board_definition.name, address);
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return;
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}
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});
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}
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SerialDevice& PCISerialDevice::the()
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{
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VERIFY(s_the);
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return *s_the;
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}
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bool PCISerialDevice::is_available()
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{
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return s_the;
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}
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}
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