usr/src/sys/sys/systm.h

/*      systm.h 3.3     %G%     */

/*
 * Random set of variables
 * used by more than one
 * routine.
 */
char    canonb[CANBSIZ];        /* buffer for erase and kill (#@) */
int     cpusid;                 /* cpu SID register */
char    version[];              /* system version */
int     lbolt;                  /* time of day in 60th not in time */
time_t  time;                   /* time in sec from 1970 */
time_t  bootime;                /* time at which booted */

int     hand;                   /* current index into coremap used by daemon */

/*
 * 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;

/*
 * Number of character switch entries.
 * Set by cinit/prim.c
 */
int     nchrdev;

int     mpid;                   /* generic for unique process id's */
char    runin;                  /* scheduling flag */
char    runout;                 /* scheduling flag */
int     runrun;                 /* scheduling flag */
char    kmapwnt;                /* kernel map want flag */
char    curpri;                 /* more scheduling */

int     maxmem;                 /* actual max memory per process */
int     physmem;                /* physical memory on this CPU */

daddr_t swplo;                  /* block number of swap space */
int     nswap;                  /* size of swap space */
int     updlock;                /* lock for sync */
daddr_t rablock;                /* block to be read ahead */
char    msgbuf[MSGBUFS];        /* saved "printf" characters */
int     intstack[512];          /* stack for interrupts */
dev_t   rootdev;                /* device of the root */
dev_t   swapdev;                /* swapping device */
dev_t   pipedev;                /* pipe device */

extern  int icode[];            /* user init code */
extern  int szicode;            /* its size */

extern  int printsw;            /* debug print switch */
extern  int coresw;             /* switch to force action on core dumps */

dev_t   getmdev();
daddr_t bmap();
unsigned max();
unsigned min();
int     memall();
int     uchar();
int     vmemall();
swblk_t vtod();
/*
 * Instrumentation
 */
int     dk_busy;
long    dk_time[32];
long    dk_numb[3];
long    dk_wds[3];
long    tk_nin;
long    tk_nout;

/*
 * Structure of the system-entry table
 */
extern struct sysent
{
        char    sy_narg;                /* total number of arguments */
        char    sy_nrarg;               /* number of args in registers */
        int     (*sy_call)();           /* handler */
} sysent[];

char    vmmap[];                /* poor name! */
int     mcr[3];                 /* memory controller registers */
int     umbabeg,umbaend;        /* where sensitive vm begins/ends */
int     noproc;                 /* no one is running just now */