libitm/config/arm/target.h

   1 /* Copyright (C) 2011-2013 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Transactional Memory Library (libitm).
   5
   6    Libitm is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 namespace GTM HIDDEN {
  26
  27 typedef struct gtm_jmpbuf
  28 {
  29   unsigned long long vfp[8];    /* d8-d15 */
  30   unsigned long long iwmmxt[6]; /* cr10-cr15 */
  31   unsigned long gr[8];          /* r4-r11 */
  32   void *cfa;
  33   unsigned long pc;
  34 } gtm_jmpbuf;
  35
  36 /* ARM generally uses a fixed page size of 4K.  */
  37 #define PAGE_SIZE       4096
  38 #define FIXED_PAGE_SIZE 1
  39
  40 /* ??? The size of one line in hardware caches (in bytes). */
  41 #define HW_CACHELINE_SIZE 64
  42
  43 static inline void
  44 cpu_relax (void)
  45 {
  46   /* ??? The kernel uses the condition
  47         #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
  48      Given that we're actually just waiting, it doesn't seem like it
  49      hurts to simply use a full barrier all the time.  */
  50   __sync_synchronize ();
  51 }
  52
  53 } // namespace GTM