devfs initial implementation

src/include/sys/sysmacros.h

@@ -0,0 +1,8 @@
+#ifndef _SYSMACROS_H_INCLUDE
+#define _SYSMACROS_H_INCLUDE
+
+#define makedev(major,minor) (((major & 0xFFF) << 8) + (minor & 0xFF))
+#define major(dev) ((dev >> 8) & 0xFFF)
+#define minor(dev) (dev & 0xFF)
+
+#endif