service_runtime/nacl_ldt.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl local descriptor table (LDT) management - common for all platforms
  34  */
  35
  36 #include "native_client/include/nacl_platform.h"
  37 #include "native_client/service_runtime/nacl_ldt.h"
  38
  39 extern int NaClLdtInitPlatformSpecific();
  40 extern int NaClLdtFiniPlatformSpecific();
  41
  42 int NaClLdtInit()
  43 {
  44   if (!NaClLdtInitPlatformSpecific()) {
  45     return 0;
  46   }
  47   /* Allocate the last LDT entry to force LDT grow to its maximum size */
  48   if (!NaClLdtAllocateSelector(LDT_ENTRIES - 1, 0,
  49     NACL_LDT_DESCRIPTOR_DATA, 0, 0, 0)) {
  50       return 0;
  51   }
  52   return 1;
  53 }
  54
  55 void NaClLdtFini()
  56 {
  57   NaClLdtFiniPlatformSpecific();
  58 }