/usr/include/xenomai/asm-x86/atomic.h is in libxenomai-dev 2.5.5.2-1ubuntu2.
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) 2007 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_X86_ATOMIC_H
#define _XENO_ASM_X86_ATOMIC_H
#include <asm/xenomai/features.h>
typedef unsigned long atomic_flags_t;
#ifdef __KERNEL__
#include <linux/bitops.h>
#include <asm/atomic.h>
#include <asm/system.h>
#include <asm/xenomai/wrappers.h>
#define xnarch_atomic_set(pcounter,i) atomic_long_set(pcounter,i)
#define xnarch_atomic_get(pcounter) atomic_long_read(pcounter)
#define xnarch_atomic_inc(pcounter) atomic_long_inc(pcounter)
#define xnarch_atomic_dec(pcounter) atomic_long_dec(pcounter)
#define xnarch_atomic_inc_and_test(pcounter) \
atomic_long_inc_and_test(pcounter)
#define xnarch_atomic_dec_and_test(pcounter) \
atomic_long_dec_and_test(pcounter)
#define xnarch_atomic_cmpxchg(pcounter,old,new) \
atomic_long_cmpxchg((pcounter),(old),(new))
typedef atomic_long_t atomic_counter_t;
typedef atomic_long_t xnarch_atomic_t;
#define xnarch_atomic_set_mask(pflags,mask) \
atomic_set_mask((mask),(unsigned *)(pflags))
#define xnarch_atomic_clear_mask(pflags,mask) \
atomic_clear_mask((mask),(unsigned *)(pflags))
#define xnarch_atomic_xchg(ptr,x) xchg(ptr,x)
#define xnarch_memory_barrier() smp_mb()
#else /* !__KERNEL__ */
#include <xeno_config.h>
#ifdef CONFIG_SMP
#define LOCK_PREFIX "lock ; "
#else
#define LOCK_PREFIX ""
#endif
typedef struct { unsigned long counter; } xnarch_atomic_t;
#define xnarch_atomic_get(v) ((v)->counter)
#define xnarch_atomic_set(v,i) (((v)->counter) = (i))
#define xnarch_write_memory_barrier() xnarch_memory_barrier()
#ifdef __i386__
struct __xeno_xchg_dummy { unsigned long a[100]; };
#define __xeno_xg(x) ((struct __xeno_xchg_dummy *)(x))
static inline unsigned long xnarch_atomic_xchg (volatile void *ptr,
unsigned long x)
{
__asm__ __volatile__("xchgl %0,%1"
:"=r" (x)
:"m" (*__xeno_xg(ptr)), "0" (x)
:"memory");
return x;
}
static inline unsigned long
xnarch_atomic_cmpxchg(xnarch_atomic_t *v, unsigned long old, unsigned long newval)
{
volatile void *ptr = &v->counter;
unsigned long prev;
__asm__ __volatile__(LOCK_PREFIX "cmpxchgl %1,%2"
: "=a"(prev)
: "r"(newval), "m"(*__xeno_xg(ptr)), "0"(old)
: "memory");
return prev;
}
#define xnarch_memory_barrier() __asm__ __volatile__("": : :"memory")
#define xnarch_read_memory_barrier() \
__asm__ __volatile__ (LOCK_PREFIX "addl $0,0(%%esp)": : :"memory")
#else /* x86_64 */
#define __xeno_xg(x) ((volatile long *)(x))
static inline unsigned long xnarch_atomic_xchg (volatile void *ptr,
unsigned long x)
{
__asm__ __volatile__("xchgq %0,%1"
:"=r" (x)
:"m" (*__xeno_xg(ptr)), "0" (x)
:"memory");
return x;
}
static inline unsigned long
xnarch_atomic_cmpxchg(xnarch_atomic_t *v, unsigned long old, unsigned long newval)
{
volatile void *ptr = &v->counter;
unsigned long prev;
__asm__ __volatile__(LOCK_PREFIX "cmpxchgq %1,%2"
: "=a"(prev)
: "r"(newval), "m"(*__xeno_xg(ptr)), "0"(old)
: "memory");
return prev;
}
#define xnarch_memory_barrier() asm volatile("mfence":::"memory")
#define xnarch_read_memory_barrier() asm volatile("lfence":::"memory")
#endif /* x86_64 */
#endif /* __KERNEL__ */
#endif /* !_XENO_ASM_X86_ATOMIC_64_H */
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