grub-core/osdep/unix/dl.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2013  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <config.h>
  20 #include <config-util.h>
  21
  22 #include <grub/dl.h>
  23 #include <grub/misc.h>
  24 #include <grub/mm.h>
  25 #include <sys/mman.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 void *
  30 grub_osdep_dl_memalign (grub_size_t align, grub_size_t size)
  31 {
  32   void *ret;
  33   if (align < 8192 * 16)
  34     align = 8192 * 16;
  35   size = ALIGN_UP (size, 8192 * 16);
  36
  37 #if defined(HAVE_POSIX_MEMALIGN)
  38   if (posix_memalign (&ret, align, size) != 0)
  39     ret = 0;
  40 #elif defined(HAVE_MEMALIGN)
  41   ret = memalign (align, size);
  42 #else
  43 #error "Complete this"
  44 #endif
  45
  46   if (!ret)
  47     {
  48       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
  49       return NULL;
  50     }
  51
  52   mprotect (ret, size, PROT_READ | PROT_WRITE | PROT_EXEC);
  53   return ret;
  54 }
  55
  56 void
  57 grub_dl_osdep_dl_free (void *ptr)
  58 {
  59   if (ptr)
  60     free (ptr);
  61 }