The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/emulation/43bsd/43bsd_vm.c

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    1 /*
    2  * (MPSAFE)
    3  *
    4  * 43BSD_VM.C           - 4.3BSD compatibility virtual memory syscalls
    5  *
    6  * Copyright (c) 1988 University of Utah.
    7  * Copyright (c) 1991, 1993
    8  *      The Regents of the University of California.  All rights reserved.
    9  *
   10  * This code is derived from software contributed to Berkeley by
   11  * the Systems Programming Group of the University of Utah Computer
   12  * Science Department.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  * 3. 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  * $DragonFly: src/sys/emulation/43bsd/43bsd_vm.c,v 1.4 2006/09/17 21:07:25 dillon Exp $
   39  *      from: DragonFly vm/vm_unix.c,v 1.3
   40  *      from: DragonFly vm/vm_mmap.c,v 1.15
   41  */
   42 
   43 #include "opt_compat.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/sysproto.h>
   47 #include <sys/kern_syscall.h>
   48 #include <sys/mman.h>
   49 #include <sys/proc.h>
   50 
   51 #include <sys/thread.h>
   52 #include <sys/thread2.h>
   53 
   54 /*
   55  * No requirements
   56  */
   57 int
   58 sys_ovadvise(struct ovadvise_args *uap)
   59 {
   60         return (EINVAL);
   61 }
   62 
   63 /*
   64  * No requirements
   65  */
   66 int
   67 sys_ogetpagesize(struct getpagesize_args *uap)
   68 {
   69         uap->sysmsg_iresult = PAGE_SIZE;
   70         return (0);
   71 }
   72 
   73 /*
   74  * No requirements
   75  */
   76 int
   77 sys_ommap(struct ommap_args *uap)
   78 {
   79         static const char cvtbsdprot[8] = {
   80                 0,
   81                 PROT_EXEC,
   82                 PROT_WRITE,
   83                 PROT_EXEC | PROT_WRITE,
   84                 PROT_READ,
   85                 PROT_EXEC | PROT_READ,
   86                 PROT_WRITE | PROT_READ,
   87                 PROT_EXEC | PROT_WRITE | PROT_READ,
   88         };
   89         int error, flags, prot;
   90 
   91 #define OMAP_ANON       0x0002
   92 #define OMAP_COPY       0x0020
   93 #define OMAP_SHARED     0x0010
   94 #define OMAP_FIXED      0x0100
   95 #define OMAP_INHERIT    0x0800
   96 
   97         prot = cvtbsdprot[uap->prot & 0x7];
   98         flags = 0;
   99         if (uap->flags & OMAP_ANON)
  100                 flags |= MAP_ANON;
  101         if (uap->flags & OMAP_COPY)
  102                 flags |= MAP_COPY;
  103         if (uap->flags & OMAP_SHARED)
  104                 flags |= MAP_SHARED;
  105         else
  106                 flags |= MAP_PRIVATE;
  107         if (uap->flags & OMAP_FIXED)
  108                 flags |= MAP_FIXED;
  109         if (uap->flags & OMAP_INHERIT)
  110                 flags |= MAP_INHERIT;
  111 
  112         error = kern_mmap(curproc->p_vmspace, uap->addr, uap->len,
  113                           prot, flags, uap->fd, uap->pos,
  114                           &uap->sysmsg_resultp);
  115 
  116         return (error);
  117 }

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