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/**
* @file rtems/score/cpuatomic.h
*
* This include file implements the atomic operations for i386 and defines
* atomic data types which are used by the atomic operations API file. This
* file should use fixed name cpuatomic.h and should be included in atomic
* operations API file atomic.h. Most of the parts of implementations are
* imported from FreeBSD kernel.
*/
/*
* Copyright (c) 1998 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _RTEMS_SCORE_ATOMIC_CPU_H
#define _RTEMS_SCORE_ATOMIC_CPU_H
#include <rtems/score/genericcpuatomic.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup RTEMS atomic implementation
*
*/
/**@{*/
#if defined(RTEMS_SMP)
#define MPLOCKED "lock ; "
#else
#define MPLOCKED
#endif
#if !defined(RTEMS_SMP)
/*
* We assume that a = b will do atomic loads and stores. However, on a
* PentiumPro or higher, reads may pass writes, so for that case we have
* to use a serializing instruction (i.e. with LOCK) to do the load in
* SMP kernels. For UP kernels, however, the cache of the single processor
* is always consistent, so we only need to take care of compiler.
*/
#define ATOMIC_STORE_LOAD(NAME, TYPE, LOP, SOP) \
static inline Atomic_##TYPE \
_CPU_Atomic_Load_##NAME(volatile Atomic_##TYPE *p) \
{ \
Atomic_##TYPE tmp; \
\
tmp = *p; \
__asm __volatile("" : : : "memory"); \
return (tmp); \
} \
\
static inline _CPU_Atomic_Load_acq_##NAME(volatile Atomic_##TYPE *p) \
{ \
Atomic_##TYPE tmp; \
\
tmp = *p; \
__asm __volatile("" : : : "memory"); \
return (tmp); \
} \
\
static inline void \
_CPU_Atomic_Store_##NAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v) \
{ \
__asm __volatile("" : : : "memory"); \
*p = v; \
} \
\
static inline void \
_CPU_Atomic_Store_rel_##NAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v) \
{ \
__asm __volatile("" : : : "memory"); \
*p = v; \
} \
#else /* !(!SMP) */
#define ATOMIC_STORE_LOAD(NAME, TYPE, LOP, SOP) \
static inline Atomic_##TYPE \
_CPU_Atomic_Load_##NAME(volatile Atomic_##TYPE *p) \
{ \
Atomic_##TYPE res; \
\
__asm __volatile(MPLOCKED LOP \
: "=a" (res), /* 0 */ \
"=m" (*p) /* 1 */ \
: "m" (*p) /* 2 */ \
: "memory", "cc"); \
\
return (res); \
} \
\
static inline Atomic_##TYPE \
_CPU_Atomic_Load_acq_##NAME(volatile Atomic_##TYPE *p) \
{ \
Atomic_##TYPE res; \
\
__asm __volatile(MPLOCKED LOP \
: "=a" (res), /* 0 */ \
"=m" (*p) /* 1 */ \
: "m" (*p) /* 2 */ \
: "memory", "cc"); \
\
return (res); \
} \
\
/* \
* The XCHG instruction asserts LOCK automagically. \
*/ \
static inline void \
_CPU_Atomic_Store_##NAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v) \
{ \
__asm __volatile(SOP \
: "=m" (*p), /* 0 */ \
"+r" (v) /* 1 */ \
: "m" (*p) /* 2 */ \
: "memory"); \
} \
static inline void \
_CPU_Atomic_Store_rel_##NAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v) \
{ \
__asm __volatile(SOP \
: "=m" (*p), /* 0 */ \
"+r" (v) /* 1 */ \
: "m" (*p) /* 2 */ \
: "memory"); \
} \
#endif /* !SMP */
/*
* The assembly is volatilized to avoid code chunk removal by the compiler.
* GCC aggressively reorders operations and memory clobbering is necessary
* in order to avoid that for memory barriers.
*/
#define ATOMIC_FETCH_GENERIC(NAME, TYPENAME, TYPE, OP, CONS, V) \
static inline void \
_CPU_Atomic_Fetch_##NAME##_##TYPENAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v) \
{ \
__asm __volatile(MPLOCKED OP \
: "=m" (*p) \
: CONS (V), "m" (*p) \
: "cc"); \
} \
\
static inline void \
_CPU_Atomic_Fetch_##NAME##_barr_##TYPENAME(volatile Atomic_##TYPE *p, Atomic_##TYPE v)\
{ \
__asm __volatile(MPLOCKED OP \
: "=m" (*p) \
: CONS (V), "m" (*p) \
: "memory", "cc"); \
} \
/*
* Atomic compare and set, used by the mutex functions
*
* if (*dst == expect) *dst = src (all 32 bit words)
*
* Returns 0 on failure, non-zero on success
*/
static inline int
_CPU_Atomic_Compare_exchange_int(volatile Atomic_Int *dst, Atomic_Int expect, Atomic_Int src)
{
unsigned char res;
__asm __volatile(
" " MPLOCKED " "
" cmpxchgl %2,%1 ; "
" sete %0 ; "
"1: "
"# atomic_cmpset_int"
: "=a" (res), /* 0 */
"=m" (*dst) /* 1 */
: "r" (src), /* 2 */
"a" (expect), /* 3 */
"m" (*dst) /* 4 */
: "memory", "cc");
return (res);
}
static inline int
_CPU_Atomic_Compare_exchange_long(volatile Atomic_Long *dst, Atomic_Long expect, Atomic_Long src)
{
return (_CPU_Atomic_Compare_exchange_int((volatile Atomic_Int *)dst, (Atomic_Int)expect,
(Atomic_Int)src));
}
ATOMIC_STORE_LOAD(int, Int, "cmpxchgl %0,%1", "xchgl %1,%0");
ATOMIC_STORE_LOAD(long, Long, "cmpxchgl %0,%1", "xchgl %1,%0");
ATOMIC_FETCH_GENERIC(add, int, Int, "addl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(sub, int, Int, "subl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(or, int, Int, "orl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(and, int, Int, "andl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(add, long, Long, "addl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(sub, long, Long, "subl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(or, long, Long, "orl %1,%0", "ir", v);
ATOMIC_FETCH_GENERIC(and, long, Long, "andl %1,%0", "ir", v);
#define _CPU_Atomic_Fetch_or_acq_int _CPU_Atomic_Fetch_or_barr_int
#define _CPU_Atomic_Fetch_or_rel_int _CPU_Atomic_Fetch_or_barr_int
#define _CPU_Atomic_Fetch_and_acq_int _CPU_Atomic_Fetch_and_barr_int
#define _CPU_Atomic_Fetch_and_rel_int _CPU_Atomic_Fetch_and_barr_int
#define _CPU_Atomic_Fetch_add_acq_int _CPU_Atomic_Fetch_add_barr_int
#define _CPU_Atomic_Fetch_add_rel_int _CPU_Atomic_Fetch_add_barr_int
#define _CPU_Atomic_Fetch_sub_acq_int _CPU_Atomic_Fetch_sub_barr_int
#define _CPU_Atomic_Fetch_sub_rel_int _CPU_Atomic_Fetch_sub_barr_int
#define _CPU_Atomic_Compare_exchange_acq_int _CPU_Atomic_Compare_exchange_int
#define _CPU_Atomic_Compare_exchange_rel_int _CPU_Atomic_Compare_exchange_int
#define _CPU_Atomic_Fetch_or_acq_long _CPU_Atomic_Fetch_or_barr_long
#define _CPU_Atomic_Fetch_or_rel_long _CPU_Atomic_Fetch_or_barr_long
#define _CPU_Atomic_Fetch_and_acq_long _CPU_Atomic_Fetch_and_barr_long
#define _CPU_Atomic_Fetch_and_rel_long _CPU_Atomic_Fetch_and_barr_long
#define _CPU_Atomic_Fetch_add_acq_long _CPU_Atomic_Fetch_add_barr_long
#define _CPU_Atomic_Fetch_add_rel_long _CPU_Atomic_Fetch_add_barr_long
#define _CPU_Atomic_Fetch_sub_acq_long _CPU_Atomic_Fetch_sub_barr_long
#define _CPU_Atomic_Fetch_sub_rel_long _CPU_Atomic_Fetch_sub_barr_long
#define _CPU_Atomic_Compare_exchange_acq_long _CPU_Atomic_Compare_exchange_long
#define _CPU_Atomic_Compare_exchange_rel_long _CPU_Atomic_Compare_exchange_long
/* Operations on 32-bit double words. */
#define _CPU_Atomic_Fetch_or_32(p, v) \
_CPU_Atomic_Fetch_or_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_or_acq_32(p, v) \
_CPU_Atomic_Fetch_or_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_or_rel_32(p, v) \
_CPU_Atomic_Fetch_or_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_32(p, v) \
_CPU_Atomic_Fetch_and_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_acq_32(p, v) \
_CPU_Atomic_Fetch_and_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_rel_32(p, v) \
_CPU_Atomic_Fetch_and_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_32(p, v) \
_CPU_Atomic_Fetch_add_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_acq_32(p, v) \
_CPU_Atomic_Fetch_add_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_rel_32(p, v) \
_CPU_Atomic_Fetch_add_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_32(p, v) \
_CPU_Atomic_Fetch_sub_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_acq_32(p, v) \
_CPU_Atomic_Fetch_sub_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_rel_32(p, v) \
_CPU_Atomic_Fetch_sub_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Load_32(p) \
_CPU_Atomic_Load_int((volatile Atomic_Int *)(p))
#define _CPU_Atomic_Load_acq_32(p) \
_CPU_Atomic_Load_acq_int((volatile Atomic_Int *)(p))
#define _CPU_Atomic_Store_32(p, v) \
_CPU_Atomic_Store_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Store_rel_32(p, v) \
_CPU_Atomic_Store_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Compare_exchange_32(dst, old, new) \
_CPU_Atomic_Compare_exchange_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), (Atomic_Int)(new))
#define _CPU_Atomic_Compare_exchange_acq_32(dst, old, new) \
_CPU_Atomic_Compare_exchange_acq_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), (Atomic_Int)(new))
#define _CPU_Atomic_Compare_exchange_rel_32(dst, old, new) \
_CPU_Atomic_Compare_exchange_rel_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), (Atomic_Int)(new))
/* Operations on pointers. */
#define _CPU_Atomic_Fetch_or_ptr(p, v) \
_CPU_Atomic_Fetch_or_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_or_acq_ptr(p, v) \
_CPU_Atomic_Fetch_or_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_or_rel_ptr(p, v) \
_CPU_Atomic_Fetch_or_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_ptr(p, v) \
_CPU_Atomic_Fetch_and_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_acq_ptr(p, v) \
_CPU_Atomic_Fetch_and_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_and_rel_ptr(p, v) \
_CPU_Atomic_Fetch_and_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_ptr(p, v) \
_CPU_Atomic_Fetch_add_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_acq_ptr(p, v) \
_CPU_Atomic_Fetch_add_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_add_rel_ptr(p, v) \
_CPU_Atomic_Fetch_add_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_ptr(p, v) \
_CPU_Atomic_Fetch_sub_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_acq_ptr(p, v) \
_CPU_Atomic_Fetch_sub_acq_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Fetch_sub_rel_ptr(p, v) \
_CPU_Atomic_Fetch_sub_rel_int((volatile Atomic_Int *)(p), (Atomic_Int)(v))
#define _CPU_Atomic_Load_ptr(p) \
_CPU_Atomic_Load_int((volatile Atomic_Int *)(p))
#define _CPU_Atomic_Load_acq_ptr(p) \
_CPU_Atomic_Load_acq_int((volatile Atomic_Int *)(p))
#define _CPU_Atomic_Store_ptr(p, v) \
_CPU_Atomic_Store_int((volatile Atomic_Int *)(p), (v))
#define _CPU_Atomic_Store_rel_ptr(p, v) \
_CPU_Atomic_Store_rel_int((volatile Atomic_Int *)(p), (v))
#define _CPU_Atomic_Compare_exchange_ptr(dst, old, new) \
_CPU_Atomic_Compare_exchange_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), (Atomic_Int)(new))
#define _CPU_Atomic_Compare_exchange_acq_ptr(dst, old, new) \
_CPU_Atomic_Compare_exchange_acq_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), \
(Atomic_Int)(new))
#define _CPU_Atomic_Compare_exchange_rel_ptr(dst, old, new) \
_CPU_Atomic_Compare_exchange_rel_int((volatile Atomic_Int *)(dst), (Atomic_Int)(old), \
(Atomic_Int)(new))
#ifdef __cplusplus
}
#endif
/**@}*/
#endif
/* end of include file */
|
