Add original unix v6

sys/conf.h

@@ -0,0 +1,55 @@
+/*
+ * Used to dissect integer device code
+ * into major (driver designation) and
+ * minor (driver parameter) parts.
+ */
+struct
+{
+	char	d_minor;
+	char	d_major;
+};
+
+/*
+ * Declaration of block device
+ * switch. Each entry (row) is
+ * the only link between the
+ * main unix code and the driver.
+ * The initialization of the
+ * device switches is in the
+ * file conf.c.
+ */
+struct	bdevsw
+{
+	int	(*d_open)();
+	int	(*d_close)();
+	int	(*d_strategy)();
+	int	*d_tab;
+} bdevsw[];
+
+/*
+ * Nblkdev is the number of entries
+ * (rows) in the block switch. It is
+ * set in binit/bio.c by making
+ * a pass over the switch.
+ * Used in bounds checking on major
+ * device numbers.
+ */
+int	nblkdev;
+
+/*
+ * Character device switch.
+ */
+struct	cdevsw
+{
+	int	(*d_open)();
+	int	(*d_close)();
+	int	(*d_read)();
+	int	(*d_write)();
+	int	(*d_sgtty)();
+} cdevsw[];
+
+/*
+ * Number of character switch entries.
+ * Set by cinit/tty.c
+ */
+int	nchrdev;