include/urcu/arch/arm.h

   1 #ifndef _URCU_ARCH_ARM_H
   2 #define _URCU_ARCH_ARM_H
   3
   4 /*
   5  * arch_arm.h: trivial definitions for the ARM architecture.
   6  *
   7  * Copyright (c) 2010 Paul E. McKenney, IBM Corporation.
   8  * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include <urcu/compiler.h>
  26 #include <urcu/config.h>
  27 #include <urcu/syscall-compat.h>
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 /*
  34  * Using DMB is faster than the builtin __sync_synchronize and this instruction is
  35  * part of the baseline ARMv7 ISA.
  36  */
  37 #ifdef URCU_ARCH_ARMV7
  38
  39 /* For backwards compat. */
  40 #define CONFIG_RCU_ARM_HAVE_DMB 1
  41
  42 /*
  43  * Issues full system DMB operation.
  44  */
  45 #define cmm_mb()        __asm__ __volatile__ ("dmb sy":::"memory")
  46 #define cmm_rmb()       __asm__ __volatile__ ("dmb sy":::"memory")
  47 #define cmm_wmb()       __asm__ __volatile__ ("dmb sy":::"memory")
  48
  49 /*
  50  * Issues DMB operation only to the inner shareable domain.
  51  */
  52 #define cmm_smp_mb()    __asm__ __volatile__ ("dmb ish":::"memory")
  53 #define cmm_smp_rmb()   __asm__ __volatile__ ("dmb ish":::"memory")
  54 #define cmm_smp_wmb()   __asm__ __volatile__ ("dmb ish":::"memory")
  55
  56 #endif /* URCU_ARCH_ARMV7 */
  57
  58 #include <stdlib.h>
  59 #include <sys/time.h>
  60
  61 /*
  62  * On Linux, define the membarrier system call number if not yet available in
  63  * the system headers.
  64  */
  65 #if (defined(__linux__) && !defined(__NR_membarrier))
  66 #define __NR_membarrier         389
  67 #endif
  68
  69 /*
  70  * Error out for compilers with known bugs.
  71  */
  72
  73 /*
  74  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
  75  */
  76 #ifdef URCU_GCC_VERSION
  77 # if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
  78 #  error Your gcc version produces clobbered frame accesses
  79 # endif
  80 #endif
  81
  82 /*
  83  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
  84  */
  85 #ifdef URCU_GCC_VERSION
  86 # if URCU_GCC_VERSION >= 40400 && URCU_GCC_VERSION <= 40402
  87 #  error Your gcc version has a non-functional __sync_synchronize()
  88 # endif
  89 #endif
  90
  91 #ifdef __cplusplus
  92 }
  93 #endif
  94
  95 #include <urcu/arch/generic.h>
  96
  97 #endif /* _URCU_ARCH_ARM_H */