2.11BSD#431 - /usr/src/sys/h/systm.h

   1: /*
   2:  * Copyright (c) 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)systm.h	1.3 (2.11BSD GTE) 1996/5/9
   7:  */
   8: 
   9: #ifndef SUPERVISOR
  10: 
  11: /*
  12:  * The `securelevel' variable controls the security level of the system.
  13:  * It can only be decreased by process 1 (/sbin/init).
  14:  *
  15:  * Security levels are as follows:
  16:  *   -1	permannently insecure mode - always run system in level 0 mode.
  17:  *    0	insecure mode - immutable and append-only flags make be turned off.
  18:  *	All devices may be read or written subject to permission modes.
  19:  *    1	secure mode - immutable and append-only flags may not be changed;
  20:  *	raw disks of mounted filesystems, /dev/mem, and /dev/kmem are
  21:  *	read-only.
  22:  *    2	highly secure mode - same as (1) plus raw disks are always
  23:  *	read-only whether mounted or not. This level precludes tampering
  24:  *	with filesystems by unmounting them, but also inhibits running
  25:  *	newfs while the system is secured.
  26:  *
  27:  * In normal operation, the system runs in level 0 mode while single user
  28:  * and in level 1 mode while multiuser. If level 2 mode is desired while
  29:  * running multiuser, it can be set in the multiuser startup script
  30:  * (/etc/rc.local) using sysctl(8). If it is desired to run the system
  31:  * in level 0 mode while multiuser, initialize the variable securelevel
  32:  * in /sys/kern/kern_sysctl.c to -1. Note that it is NOT initialized to
  33:  * zero as that would allow the vmunix binary to be patched to -1.
  34:  * Without initialization, securelevel loads in the BSS area which only
  35:  * comes into existence when the kernel is loaded and hence cannot be
  36:  * patched by a stalking hacker.
  37:  */
  38: extern int securelevel;     /* system security level */
  39: 
  40: extern  char version[];     /* system version */
  41: 
  42: /*
  43:  * Nblkdev is the number of entries (rows) in the block switch.
  44:  * Used in bounds checking on major device numbers.
  45:  */
  46: int nblkdev;
  47: 
  48: /*
  49:  * Number of character switch entries.
  50:  */
  51: int nchrdev;
  52: 
  53: int mpid;           /* generic for unique process id's */
  54: char    runin;          /* scheduling flag */
  55: char    runout;         /* scheduling flag */
  56: int runrun;         /* scheduling flag */
  57: char    curpri;         /* more scheduling */
  58: 
  59: u_int   maxmem;         /* actual max memory per process */
  60: 
  61: u_int   nswap;          /* size of swap space */
  62: int updlock;        /* lock for sync */
  63: daddr_t rablock;        /* block to be read ahead */
  64: dev_t   rootdev;        /* device of the root */
  65: dev_t   dumpdev;        /* device to take dumps on */
  66: long    dumplo;         /* offset into dumpdev */
  67: dev_t   swapdev;        /* swapping device */
  68: dev_t   pipedev;        /* pipe device */
  69: int nodev();        /* no device function used in bdevsw/cdevsw */
  70: 
  71: extern  int icode[];        /* user init code */
  72: extern  int szicode;        /* its size */
  73: 
  74: daddr_t bmap();
  75: 
  76: ubadr_t clstaddr;       /* UNIBUS virtual address of clists */
  77: 
  78: extern int  cputype;    /* type of cpu = 40, 44, 45, 60, or 70 */
  79: 
  80: /*
  81:  * Structure of the system-entry table
  82:  */
  83: extern struct sysent
  84: {
  85:     char    sy_narg;        /* total number of arguments */
  86:     int (*sy_call)();       /* handler */
  87: } sysent[];
  88: 
  89: int noproc;         /* no one is running just now */
  90: char    *panicstr;
  91: int boothowto;      /* reboot flags, from boot */
  92: int selwait;
  93: 
  94: /* casts to keep lint happy */
  95: #ifdef lint
  96: #define insque(q,p) _insque((caddr_t)q,(caddr_t)p)
  97: #define remque(q)   _remque((caddr_t)q)
  98: #endif
  99: 
 100: extern  bool_t  sep_id;     /* separate I/D */
 101: extern  char    regloc[];   /* offsets of saved user registers (trap.c) */
 102: #endif

Defined variables

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Defined macros

Usage of this include