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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
#include <uart.hpp>
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#include <vector.hpp>
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#include <debug.h>
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#include <io.h>
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volatile bool serialports[8] = {false, false, false, false, false, false, false, false};
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Vector<UniversalAsynchronousReceiverTransmitter::Events *> RegisteredEvents;
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namespace UniversalAsynchronousReceiverTransmitter
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{
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#define SERIAL_ENABLE_DLAB 0x80
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#define SERIAL_RATE_38400_LO 0x03
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#define SERIAL_RATE_38400_HI 0x00
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#define SERIAL_BUFFER_EMPTY 0x20
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UART::UART(SerialPorts Port)
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{
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#if defined(__amd64__) || defined(__i386__)
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if (Port == COMNULL)
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return;
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this->Port = Port;
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if (serialports[Port])
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return;
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// Initialize the serial port
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outb(Port + 1, 0x00); // Disable all interrupts
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outb(Port + 3, SERIAL_ENABLE_DLAB); // Enable DLAB (set baud rate divisor)
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outb(Port + 0, SERIAL_RATE_38400_LO); // Set divisor to 3 (lo byte) 38400 baud
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outb(Port + 1, SERIAL_RATE_38400_HI); // (hi byte)
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outb(Port + 3, 0x03); // 8 bits, no parity, one stop bit
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outb(Port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
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outb(Port + 4, 0x0B); // IRQs enabled, RTS/DSR set
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// Check if the serial port is faulty.
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if (inb(Port + 0) != 0xAE)
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{
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static int once = 0;
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if (!once++)
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warn("Serial port %#lx is faulty.", Port);
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// serialports[Port] = false; // ignore for now
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// return;
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}
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// Set to normal operation mode.
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outb(Port + 4, 0x0F);
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serialports[Port] = true;
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#endif
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}
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UART::~UART() {}
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void UART::Write(uint8_t Char)
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{
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#if defined(__amd64__) || defined(__i386__)
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while ((inb(Port + 5) & SERIAL_BUFFER_EMPTY) == 0)
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;
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outb(Port, Char);
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#endif
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foreach (auto e in RegisteredEvents)
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if (e->GetRegisteredPort() == Port || e->GetRegisteredPort() == COMNULL)
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e->OnSent(Char);
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}
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uint8_t UART::Read()
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{
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#if defined(__amd64__) || defined(__i386__)
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while ((inb(Port + 5) & 1) == 0)
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;
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return inb(Port);
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#endif
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foreach (auto e in RegisteredEvents)
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{
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if (e->GetRegisteredPort() == Port || e->GetRegisteredPort() == COMNULL)
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{
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#if defined(__amd64__) || defined(__i386__)
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e->OnReceived(inb(Port));
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#endif
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}
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}
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}
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Events::Events(SerialPorts Port)
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{
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this->Port = Port;
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RegisteredEvents.push_back(this);
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}
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Events::~Events()
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{
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for (uint64_t i = 0; i < RegisteredEvents.size(); i++)
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if (RegisteredEvents[i] == this)
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{
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RegisteredEvents.remove(i);
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return;
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}
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}
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}
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