vm_unix.c

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    1 /*
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1991, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
   39  *
   40  *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
   41  * $FreeBSD$
   42  */
   43 
   44 /*
   45  * Traditional sbrk/grow interface to VM
   46  */
   47 #include <sys/param.h>
   48 #include <sys/sysproto.h>
   49 #include <sys/proc.h>
   50 #include <sys/resourcevar.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_param.h>
   54 #include <sys/lock.h>
   55 #include <vm/pmap.h>
   56 #include <vm/vm_map.h>
   57 #include <vm/swap_pager.h>
   58 #include <vm/vm_prot.h>
   59 
   60 #ifndef _SYS_SYSPROTO_H_
   61 struct obreak_args {
   62         char *nsize;
   63 };
   64 #endif
   65 
   66 /* ARGSUSED */
   67 int
   68 obreak(p, uap)
   69         struct proc *p;
   70         struct obreak_args *uap;
   71 {
   72         register struct vmspace *vm = p->p_vmspace;
   73         vm_offset_t new, old, base;
   74         int rv;
   75 
   76         base = round_page((vm_offset_t) vm->vm_daddr);
   77         new = round_page((vm_offset_t)uap->nsize);
   78         if (new > base) {
   79                 if ((new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
   80                         return ENOMEM;
   81                 if (new >= VM_MAXUSER_ADDRESS)
   82                         return (ENOMEM);
   83         } else if (new < base) {
   84                 /*
   85                  * This is simply an invalid value.  If someone wants to
   86                  * do fancy address space manipulations, mmap and munmap
   87                  * can do most of what the user would want.
   88                  */
   89                 return EINVAL;
   90         }
   91 
   92         old = base + ctob(vm->vm_dsize);
   93 
   94         if (new > old) {
   95                 vm_size_t diff;
   96                 if (swap_pager_full) {
   97                         return (ENOMEM);
   98                 }
   99                 diff = new - old;
  100                 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
  101                         VM_PROT_ALL, VM_PROT_ALL, 0);
  102                 if (rv != KERN_SUCCESS) {
  103                         return (ENOMEM);
  104                 }
  105                 vm->vm_dsize += btoc(diff);
  106         } else if (new < old) {
  107                 rv = vm_map_remove(&vm->vm_map, new, old);
  108                 if (rv != KERN_SUCCESS) {
  109                         return (ENOMEM);
  110                 }
  111                 vm->vm_dsize -= btoc(old - new);
  112         }
  113         return (0);
  114 }
  115 
  116 #ifndef _SYS_SYSPROTO_H_
  117 struct ovadvise_args {
  118         int anom;
  119 };
  120 #endif
  121 
  122 /* ARGSUSED */
  123 int
  124 ovadvise(p, uap)
  125         struct proc *p;
  126         struct ovadvise_args *uap;
  127 {
  128 
  129         return (EINVAL);
  130 }

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FreeBSD/Linux Kernel Cross Reference sys/vm/vm_unix.c

FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_unix.c