/usr/include/xenomai/asm-nios2/atomic.h is in libxenomai-dev 2.6.2.1-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2009 Philippe Gerum <rpm@xenomai.org>.
*
* Xenomai is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* Xenomai is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Xenomai; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _XENO_ASM_NIOS2_ATOMIC_H
#define _XENO_ASM_NIOS2_ATOMIC_H
#ifdef __KERNEL__
#include <linux/bitops.h>
#include <asm/atomic.h>
#include <asm/system.h>
#define xnarch_atomic_xchg(ptr,v) xchg(ptr,v)
#define xnarch_memory_barrier() smp_mb()
#define xnarch_read_memory_barrier() rmb()
#define xnarch_write_memory_barrier() wmb()
static inline void atomic_set_mask(unsigned long mask, unsigned long *addr)
{
unsigned long flags;
local_irq_save_hw(flags);
*addr |= mask;
local_irq_restore_hw(flags);
}
#define xnarch_atomic_set(pcounter,i) atomic_set(pcounter,i)
#define xnarch_atomic_get(pcounter) atomic_read(pcounter)
#define xnarch_atomic_inc(pcounter) atomic_inc(pcounter)
#define xnarch_atomic_dec(pcounter) atomic_dec(pcounter)
#define xnarch_atomic_inc_and_test(pcounter) atomic_inc_and_test(pcounter)
#define xnarch_atomic_dec_and_test(pcounter) atomic_dec_and_test(pcounter)
#define xnarch_atomic_set_mask(pflags,mask) atomic_set_mask(mask, pflags)
#define xnarch_atomic_clear_mask(pflags,mask) atomic_clear_mask(mask, pflags)
#define xnarch_atomic_cmpxchg(pcounter,old,new) atomic_cmpxchg((pcounter), (old), (new))
typedef atomic_t atomic_counter_t;
typedef atomic_t xnarch_atomic_t;
#else /* !__KERNEL__ */
#include <asm/xenomai/features.h>
#include <asm/xenomai/syscall.h>
typedef struct { int counter;} xnarch_atomic_t;
#define xnarch_atomic_get(v) ((v)->counter)
#define xnarch_atomic_set(v, i) (((v)->counter) = i)
static __inline__ unsigned long xnarch_atomic_xchg(unsigned long *ptr, unsigned long x)
{
unsigned long oldval;
XENOMAI_SYSCALL4(__xn_sys_arch, __xn_lsys_xchg, ptr, x, &oldval);
return oldval;
}
#define xnarch_memory_barrier() __asm__ __volatile__("": : :"memory")
#define cpu_relax() xnarch_memory_barrier()
#define xnarch_read_memory_barrier() xnarch_memory_barrier()
#define xnarch_write_memory_barrier() xnarch_memory_barrier()
#endif /* __KERNEL__ */
typedef unsigned long atomic_flags_t;
#endif /* !_XENO_ASM_NIOS2_ATOMIC_H */
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