1 #ifndef _URCU_ARCH_ARM_H
2 #define _URCU_ARCH_ARM_H
5 * arch_arm.h: trivial definitions for the ARM architecture.
7 * Copyright (c) 2010 Paul E. McKenney, IBM Corporation.
8 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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
25 #include <urcu/compiler.h>
26 #include <urcu/config.h>
27 #include <urcu/syscall-compat.h>
34 * Using DMB is faster than the builtin __sync_synchronize and this instruction is
35 * part of the baseline ARMv7 ISA.
37 #ifdef URCU_ARCH_ARMV7
39 /* For backwards compat. */
40 #define CONFIG_RCU_ARM_HAVE_DMB 1
43 * Issues full system DMB operation.
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")
50 * Issues DMB operation only to the inner shareable domain.
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")
56 #endif /* URCU_ARCH_ARMV7 */
62 * On Linux, define the membarrier system call number if not yet available in
65 #if (defined(__linux__) && !defined(__NR_membarrier))
66 #define __NR_membarrier 389
70 * Error out for compilers with known bugs.
74 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
76 #ifdef URCU_GCC_VERSION
77 # if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
78 # error Your gcc version produces clobbered frame accesses
83 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
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()
95 #include <urcu/arch/generic.h>
97 #endif /* _URCU_ARCH_ARM_H */
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