[urcu.git] / include / urcu / arch / arm.h

// SPDX-FileCopyrightText: 2010 Paul E. McKenney, IBM Corporation.
// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
//
// SPDX-License-Identifier: LGPL-2.1-or-later

#ifndef _URCU_ARCH_ARM_H
#define _URCU_ARCH_ARM_H

/*
 * arch_arm.h: trivial definitions for the ARM architecture.
 */

#include <urcu/compiler.h>
#include <urcu/config.h>
#include <urcu/syscall-compat.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Using DMB is faster than the builtin __sync_synchronize and this instruction is
 * part of the baseline ARMv7 ISA.
 */
#ifdef URCU_ARCH_ARMV7

/* For backwards compat. */
#define CONFIG_RCU_ARM_HAVE_DMB 1

/*
 * Issues full system DMB operation.
 */
#define cmm_mb()	__asm__ __volatile__ ("dmb sy":::"memory")
#define cmm_rmb()	__asm__ __volatile__ ("dmb sy":::"memory")
#define cmm_wmb()	__asm__ __volatile__ ("dmb sy":::"memory")

/*
 * Issues DMB operation only to the inner shareable domain.
 */
#define cmm_smp_mb()	__asm__ __volatile__ ("dmb ish":::"memory")
#define cmm_smp_rmb()	__asm__ __volatile__ ("dmb ish":::"memory")
#define cmm_smp_wmb()	__asm__ __volatile__ ("dmb ish":::"memory")

#endif /* URCU_ARCH_ARMV7 */

#include <stdlib.h>
#include <sys/time.h>

/*
 * On Linux, define the membarrier system call number if not yet available in
 * the system headers.
 */
#if (defined(__linux__) && !defined(__NR_membarrier))
#define __NR_membarrier		389
#endif

/*
 * Error out for compilers with known bugs.
 */

/*
 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
 */
#ifdef URCU_GCC_VERSION
# if URCU_GCC_VERSION >= 40800 && URCU_GCC_VERSION <= 40802
#  error Your gcc version produces clobbered frame accesses
# endif
#endif

/*
 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42263
 */
#ifdef URCU_GCC_VERSION
# if URCU_GCC_VERSION >= 40400 && URCU_GCC_VERSION <= 40402
#  error Your gcc version has a non-functional __sync_synchronize()
# endif
#endif

#ifdef __cplusplus
}
#endif

#include <urcu/arch/generic.h>

#endif /* _URCU_ARCH_ARM_H */
Commit	Line	Data
	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
	6	#ifndef _URCU_ARCH_ARM_H
	7	#define _URCU_ARCH_ARM_H
	8
	9	/*
	10	* arch_arm.h: trivial definitions for the ARM architecture.
	11	*/
	12
	13	#include <urcu/compiler.h>
	14	#include <urcu/config.h>
	15	#include <urcu/syscall-compat.h>
	16
	17	#ifdef __cplusplus
	18	extern "C" {
	19	#endif
	20
	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
	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")
	43
	44	#endif /* URCU_ARCH_ARMV7 */
	45
	46	#include <stdlib.h>
	47	#include <sys/time.h>
	48
	49	/*
	50	* On Linux, define the membarrier system call number if not yet available in
	51	* the system headers.
	52	*/
	53	#if (defined(__linux__) && !defined(__NR_membarrier))
	54	#define __NR_membarrier 389
	55	#endif
	56
	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
	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
	79	#ifdef __cplusplus
	80	}
	81	#endif
	82
	83	#include <urcu/arch/generic.h>
	84
	85	#endif /* _URCU_ARCH_ARM_H */