sysdeps/mach/pagecopy.h

   1 /* Macros for copying by pages; used in memcpy, memmove.  Mach version.
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library 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 GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <mach.h>
  21
  22 /* Threshold at which vm_copy is more efficient than well-optimized copying
  23    by words.  This parameter should be tuned as necessary.  */
  24 #define PAGE_THRESHOLD          (2 * PAGE_SIZE) /* XXX ? */
  25
  26 #define PAGE_SIZE               __vm_page_size
  27 #define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes)                        \
  28   ((nbytes_left) = ((nbytes) -                                                \
  29                     (__vm_copy (__mach_task_self (),                          \
  30                                 (vm_address_t) srcp, trunc_page (nbytes),     \
  31                                 (vm_address_t) dstp) == KERN_SUCCESS          \
  32                      ? trunc_page (nbytes)                                    \
  33                      : 0)))
  34
  35 /* Get the generic macro.  */
  36 #include_next <pagecopy.h>