2.11BSD#431 - /usr/src/sys/h/map.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:  *	@(#)map.h	1.1 (2.10BSD Berkeley) 12/1/86
   7:  */
   8: 
   9: /*
  10:  * Resource Allocation Maps.
  11:  *
  12:  * Associated routines manage allocation of an address space using
  13:  * an array of segment descriptors.
  14:  *
  15:  * Malloc and mfree allocate and free the resource described
  16:  * by the resource map.  If the resource map becomes too fragmented
  17:  * to be described in the available space, then some of the resource
  18:  * is discarded.  This may lead to critical shortages,
  19:  * but is better than not checking (as the previous versions of
  20:  * these routines did) or giving up and calling panic().
  21:  *
  22:  * N.B.: The address 0 in the resource address space is not available
  23:  * as it is used internally by the resource map routines.
  24:  */
  25: 
  26: struct map {
  27:     struct mapent   *m_map;     /* start of the map */
  28:     struct mapent   *m_limit;   /* address of last slot in map */
  29:     char    *m_name;        /* name of resource */
  30: /* we use m_name when the map overflows, in warning messages */
  31: };
  32: 
  33: struct mapent {
  34:     size_t  m_size;     /* size of this segment of the map */
  35:     memaddr m_addr;     /* resource-space addr of start of segment */
  36: };
  37: 
  38: #ifdef KERNEL
  39: extern struct   map coremap[1]; /* space for core allocation */
  40: extern struct   map swapmap[1]; /* space for swap allocation */
  41: extern struct   map ub_map[1];  /* space for UNIBUS allocation */
  42: #endif

Defined struct's

Usage of this include