+
+extern const char *panicstr; /* panic message */
+extern const char version[]; /* system version */
+extern const char copyright[]; /* system copyright */
+
+extern int nblkdev; /* number of entries in bdevsw */
+extern int nchrdev; /* number of entries in cdevsw */
+extern int nswdev; /* number of swap devices */
+extern int nswap; /* size of swap space */
+
+extern int maxmem; /* max memory per process */
+extern int physmem; /* physical memory */
+
+extern dev_t dumpdev; /* dump device */
+extern long dumplo; /* offset into dumpdev */
+
+extern dev_t rootdev; /* root device */
+extern struct vnode *rootvp; /* vnode equivalent to above */
+
+extern dev_t swapdev; /* swapping device */
+extern struct vnode *swapdev_vp;/* vnode equivalent to above */
+
+extern int boothowto; /* reboot flags, from console subsystem */
+#ifdef KADB
+extern char *bootesym; /* end of symbol info from boot */
+#endif
+
+extern u_char curpri; /* priority of current process */
+
+/*
+ * The following macros are used to declare global sets of objects, which
+ * are collected by the linker into a `struct linker_set' as defined below.
+ *
+ * NB: the constants defined below must match those defined in
+ * /usr/src/gnu/ld/ld.h. Since their calculation requires arithmetic, we
+ * can't name them symbolically (e.g., 23 is N_SETT | N_EXT).
+ */
+#define MAKE_SET(set, sym, type) \
+ asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
+#define TEXT_SET(set, sym) MAKE_SET(set, sym, 23)
+#define DATA_SET(set, sym) MAKE_SET(set, sym, 25)
+#define BSS_SET(set, sym) MAKE_SET(set, sym, 27)
+#define ABS_SET(set, sym) MAKE_SET(set, sym, 21)
+
+struct linker_set {
+ int ls_length;
+ caddr_t ls_items[1]; /* really ls_length of them, trailing NULL */
+};
+