Add original unix v6

sys/text.h

@@ -0,0 +1,15 @@
+/*
+ * Text structure.
+ * One allocated per pure
+ * procedure on swap device.
+ * Manipulated by text.c
+ */
+struct text
+{
+	int	x_daddr;	/* disk address of segment */
+	int	x_caddr;	/* core address, if loaded */
+	int	x_size;		/* size (*64) */
+	int	*x_iptr;	/* inode of prototype */
+	char	x_count;	/* reference count */
+	char	x_ccount;	/* number of loaded references */
+} text[NTEXT];