x86_64 port IO

Added byte port IO with outb() and inb()

src/arch/x86_64/include/arch/io.h

@@ -0,0 +1,14 @@
+#ifndef _IO_H_INCLUDE
+#define _IO_H_INCLUDE
+
+static inline void outb(uint16_t port, uint8_t data){
+	asm("out %%al, %%dx" : : "a"(data), "d"(port));
+}
+
+static inline uint8_t inb(uint16_t port){
+	uint8_t ret;
+	asm("in %%dx, %%al" : "=a"(ret) : "d"(port));
+	return ret;
+}
+
+#endif