Driver section separation

src/drivers/serial.c

@@ -0,0 +1,65 @@
+#include "../kernel/io.h"
+#include "serial.h"
+
+int init_serial()
+{
+  outb(PORT+1, 0x00);
+  outb(PORT+3, 0x80);
+  outb(PORT+0, 0x03);
+  outb(PORT+1, 0x00);
+
+  outb(PORT+3, 0x03);
+  outb(PORT+2, 0xC7);
+  outb(PORT+4, 0x0B);
+  outb(PORT+4, 0x1E);
+  outb(PORT+0, 0xAE);
+
+  if (inb(PORT+0) != 0xAE) {
+    return 1;
+  }
+
+  outb(PORT+4, 0x0F);
+  return 0;
+}
+
+int is_transmit_empty()
+{
+  return inb(PORT+5) & 0x20;
+}
+
+void write_serial(const char a)
+{
+  while (is_transmit_empty() == 0);
+  outb(PORT, a);
+}
+
+void serial_puts(const char* str)
+{
+  unsigned int i = 0;
+  write_serial(str[0]); // Transmit first byte 2 times
+  while (*str++)
+  {
+    write_serial(str[i]);
+  }
+}
+
+void log(const char* str, const int errlevel)
+{
+  switch (errlevel)
+  {
+    case 0:
+      serial_puts("[ERROR] ");
+      break;
+    case 1:
+      serial_puts("[WARNING] ");
+      break;
+    case 2:
+      serial_puts("[INFO] ");
+      break;
+    case 3:
+      serial_puts("[DEBUG] ");
+      break;
+  }
+  serial_puts(str);
+  serial_puts("\n");
+}