Add uart printing support.

1 files changed, 18 insertions, 0 deletions

diff --git a/io.h b/io.h
new file mode 100644
index 0000000..c58c271
--- /dev/null
+++ b/io.h
@@ -0,0 +1,18 @@
+#ifndef IO_H
+#define IO_H
+
+#include "cia.h"
+
+static inline unsigned long
+inb(unsigned long port)
+{
+  return *(volatile unsigned char *)(CIA_BW_IO + port);
+}
+
+static inline void
+outb(unsigned char val, unsigned long port)
+{
+  *(volatile unsigned char *)(CIA_BW_IO + port) = val;
+}
+
+#endif