org

kernel/drivers/serial/serial.c

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "serial.h"
+#include "../../../arch/i386/asm/asm.h"
+
+#define COM1 (0x3F8)
+
+int serial_init() {
+  outb(COM1 + 1, 0x01);
+  outb(COM1 + 3, 0x80);
+  outb(COM1 + 0, 0x03);
+  outb(COM1 + 1, 0x00);
+  outb(COM1 + 3, 0x03);
+  outb(COM1 + 2, 0xC7);
+  outb(COM1 + 4, 0x0B);
+  outb(COM1 + 4, 0x0F);
+  return 0;
+}
+
+int serial_has_tx() { return inb(COM1 + 5) & 0x20; }
+
+int serial_has_rx() { return inb(COM1 + 5) & 1; }
+
+void serial_tx(char a) {
+  while (serial_has_tx() == 0)
+    ;
+
+  outb(COM1, a);
+}
+
+char serial_rx() {
+  while (serial_has_rx() == 0)
+    ;
+
+  return inb(COM1);
+}

kernel/drivers/serial/serial.h

@@ -0,0 +1,5 @@
+#pragma once
+
+int  serial_init();
+void serial_tx(char);
+char serial_rx();