ppc.h: use mftb on ppc
[urcu.git] / include / urcu / arch / arm.h
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1// SPDX-FileCopyrightText: 2010 Paul E. McKenney, IBM Corporation.
2// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3//
4// SPDX-License-Identifier: LGPL-2.1-or-later
5
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6#ifndef _URCU_ARCH_ARM_H
7#define _URCU_ARCH_ARM_H
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8
9/*
6aca0125 10 * arch_arm.h: trivial definitions for the ARM architecture.
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11 */
12
13#include <urcu/compiler.h>
14#include <urcu/config.h>
999991c6 15#include <urcu/syscall-compat.h>
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16
17#ifdef __cplusplus
18extern "C" {
67ecffc0 19#endif
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21/*
22 * Using DMB is faster than the builtin __sync_synchronize and this instruction is
23 * part of the baseline ARMv7 ISA.
24 */
25#ifdef URCU_ARCH_ARMV7
26
27/* For backwards compat. */
28#define CONFIG_RCU_ARM_HAVE_DMB 1
29
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30/*
31 * Issues full system DMB operation.
32 */
33#define cmm_mb() __asm__ __volatile__ ("dmb sy":::"memory")
34#define cmm_rmb() __asm__ __volatile__ ("dmb sy":::"memory")
35#define cmm_wmb() __asm__ __volatile__ ("dmb sy":::"memory")
36
37/*
38 * Issues DMB operation only to the inner shareable domain.
39 */
40#define cmm_smp_mb() __asm__ __volatile__ ("dmb ish":::"memory")
41#define cmm_smp_rmb() __asm__ __volatile__ ("dmb ish":::"memory")
42#define cmm_smp_wmb() __asm__ __volatile__ ("dmb ish":::"memory")
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43
44#endif /* URCU_ARCH_ARMV7 */
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45
46#include <stdlib.h>
47#include <sys/time.h>
48
da5b715a 49/*
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50 * On Linux, define the membarrier system call number if not yet available in
51 * the system headers.
da5b715a 52 */
84f4ccb4 53#if (defined(__linux__) && !defined(__NR_membarrier))
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54#define __NR_membarrier 389
55#endif
56
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57/*
58 * Error out for compilers with known bugs.
59 */
60
61/*
62 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
63 */
64#ifdef URCU_GCC_VERSION
65# if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
66# error Your gcc version produces clobbered frame accesses
67# endif
68#endif
69
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70/*
71 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
72 */
73#ifdef URCU_GCC_VERSION
74# if URCU_GCC_VERSION >= 40400 && URCU_GCC_VERSION <= 40402
75# error Your gcc version has a non-functional __sync_synchronize()
76# endif
77#endif
78
67ecffc0 79#ifdef __cplusplus
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80}
81#endif
82
1b9119f8 83#include <urcu/arch/generic.h>
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6aca0125 85#endif /* _URCU_ARCH_ARM_H */
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