Add serial0 console output

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/serial.h b/drivers/serial.h
new file mode 100644
index 0000000..0579dd4
--- /dev/null
+++ b/drivers/serial.h
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stdlib.h>
+#include "ports.h"
+
+/*
+ * Serial Port
+ *
+ * useful links:
+ * https://wiki.osdev.org/Serial_Ports
+ * https://www.lowlevel.eu/wiki/Serielle_Schnittstelle
+ */
+
+class SerialPort : public Console {
+public:
+  SerialPort();
+  ~SerialPort() = default;
+
+  bool ready_read();
+  uint8_t read();
+
+  bool ready_write();
+  void write(char c) override;
+  void write(ViewIterator& iter) override {
+    while (iter) {
+      write(iter.next());
+    }
+  }
+
+  void update_cursor() override {}
+
+private:
+  enum PortOffset : uint16_t {
+    BaudDiv_l = 0,         // if dlab is set
+    BaudDiv_h = 1,         // if dlab is set
+    Data = 0,              // read from receive buffer / write to transmit buffer
+    InterruptControl = 1,  // interrupt enable
+    FifoControl = 2,       // interrupt ID and FIFO control
+    LineControl = 3,       // most significant bit is the DLAB
+    ModemControl = 4,
+    LineStatus = 5,
+    ModemStatus = 6,
+    Scratch = 7,
+  };
+
+  com1_port_t port;
+};