1  /* Copyright (C) 2011-2023 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  /* ??? The size of one line in hardware caches (in bytes). */
      37  #define HW_CACHELINE_SIZE 64
      38  
      39  static inline void
      40  cpu_relax (void)
      41  {
      42    /* ??? The kernel uses the condition
      43  	#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
      44       Given that we're actually just waiting, it doesn't seem like it 
      45       hurts to simply use a full barrier all the time.  */
      46    __sync_synchronize ();
      47  }
      48  
      49  } // namespace GTM