Add original unix v6

sys/systm.h

@@ -0,0 +1,54 @@
+/*
+ * Random set of variables
+ * used by more than one
+ * routine.
+ */
+char	canonb[CANBSIZ];	/* buffer for erase and kill (#@) */
+int	coremap[CMAPSIZ];	/* space for core allocation */
+int	swapmap[SMAPSIZ];	/* space for swap allocation */
+int	*rootdir;		/* pointer to inode of root directory */
+int	cputype;		/* type of cpu =40, 45, or 70 */
+int	execnt;			/* number of processes in exec */
+int	lbolt;			/* time of day in 60th not in time */
+int	time[2];		/* time in sec from 1970 */
+int	tout[2];		/* time of day of next sleep */
+/*
+ * The callout structure is for
+ * a routine arranging
+ * to be called by the clock interrupt
+ * (clock.c) with a specified argument,
+ * in a specified amount of time.
+ * Used, for example, to time tab
+ * delays on teletypes.
+ */
+struct	callo
+{
+	int	c_time;		/* incremental time */
+	int	c_arg;		/* argument to routine */
+	int	(*c_func)();	/* routine */
+} callout[NCALL];
+/*
+ * Mount structure.
+ * One allocated on every mount.
+ * Used to find the super block.
+ */
+struct	mount
+{
+	int	m_dev;		/* device mounted */
+	int	*m_bufp;	/* pointer to superblock */
+	int	*m_inodp;	/* pointer to mounted on inode */
+} mount[NMOUNT];
+int	mpid;			/* generic for unique process id's */
+char	runin;			/* scheduling flag */
+char	runout;			/* scheduling flag */
+char	runrun;			/* scheduling flag */
+char	curpri;			/* more scheduling */
+int	maxmem;			/* actual max memory per process */
+int	*lks;			/* pointer to clock device */
+int	rootdev;		/* dev of root see conf.c */
+int	swapdev;		/* dev of swap see conf.c */
+int	swplo;			/* block number of swap space */
+int	nswap;			/* size of swap space */
+int	updlock;		/* lock for sync */
+int	rablock;		/* block to be read ahead */
+char	regloc[];		/* locs. of saved user registers (trap.c) */