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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2005-2011. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Native ethread atomics on x86/x86-64.
* Author: Mikael Pettersson.
*
* This code requires a 486 or newer processor.
*/
#undef ETHR_INCLUDE_ATOMIC_IMPL__
#if !defined(ETHR_X86_ATOMIC32_H__) \
&& defined(ETHR_ATOMIC_WANT_32BIT_IMPL__)
# define ETHR_X86_ATOMIC32_H__
# define ETHR_INCLUDE_ATOMIC_IMPL__ 4
# undef ETHR_ATOMIC_WANT_32BIT_IMPL__
#elif !defined(ETHR_X86_ATOMIC64_H__) \
&& defined(ETHR_ATOMIC_WANT_64BIT_IMPL__)
# define ETHR_X86_ATOMIC64_H__
# define ETHR_INCLUDE_ATOMIC_IMPL__ 8
# undef ETHR_ATOMIC_WANT_64BIT_IMPL__
#endif
#ifdef ETHR_INCLUDE_ATOMIC_IMPL__
# ifndef ETHR_X86_ATOMIC_COMMON__
# define ETHR_X86_ATOMIC_COMMON__
# define ETHR_ATOMIC_HAVE_INC_DEC_INSTRUCTIONS 1
# endif /* ETHR_X86_ATOMIC_COMMON__ */
# if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_NATIVE_ATOMIC32 1
# define ETHR_NATIVE_ATOMIC32_IMPL "ethread"
# define ETHR_NATMC_FUNC__(X) ethr_native_atomic32_ ## X
# define ETHR_ATMC_T__ ethr_native_atomic32_t
# define ETHR_AINT_T__ ethr_sint32_t
# define ETHR_AINT_SUFFIX__ "l"
# elif ETHR_INCLUDE_ATOMIC_IMPL__ == 8
# define ETHR_HAVE_NATIVE_ATOMIC64 1
# define ETHR_NATIVE_ATOMIC64_IMPL "ethread"
# define ETHR_NATMC_FUNC__(X) ethr_native_atomic64_ ## X
# define ETHR_ATMC_T__ ethr_native_atomic64_t
# define ETHR_AINT_T__ ethr_sint64_t
# define ETHR_AINT_SUFFIX__ "q"
# else
# error "Unsupported integer size"
# endif
/* An atomic is an aligned ETHR_AINT_T__ accessed via locked operations.
*/
typedef struct {
volatile ETHR_AINT_T__ counter;
} ETHR_ATMC_T__;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADDR 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADDR 1
#endif
static ETHR_INLINE ETHR_AINT_T__ *
ETHR_NATMC_FUNC__(addr)(ETHR_ATMC_T__ *var)
{
return (ETHR_AINT_T__ *) &var->counter;
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_CMPXCHG_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_CMPXCHG_MB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(cmpxchg_mb)(ETHR_ATMC_T__ *var,
ETHR_AINT_T__ new,
ETHR_AINT_T__ old)
{
__asm__ __volatile__(
"lock; cmpxchg" ETHR_AINT_SUFFIX__ " %2, %3"
: "=a"(old), "=m"(var->counter)
: "r"(new), "m"(var->counter), "0"(old)
: "cc", "memory"); /* full memory clobber to make this a compiler barrier */
return old;
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_XCHG_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_XCHG_MB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(xchg_mb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ val)
{
ETHR_AINT_T__ tmp = val;
__asm__ __volatile__(
"xchg" ETHR_AINT_SUFFIX__ " %0, %1"
: "=r"(tmp)
: "m"(var->counter), "0"(tmp)
: "memory");
/* now tmp is the atomic's previous value */
return tmp;
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_SET 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_SET 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ i)
{
var->counter = i;
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_SET_RELB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_SET_RELB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set_relb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ i)
{
#if defined(_M_IX86)
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
(void) ETHR_NATMC_FUNC__(xchg_mb)(var, i);
else
#endif /* _M_IX86 */
{
ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreStore);
var->counter = i;
}
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_SET_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_SET_MB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(set_mb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ i)
{
(void) ETHR_NATMC_FUNC__(xchg_mb)(var, i);
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_READ 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_READ 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(read)(ETHR_ATMC_T__ *var)
{
return var->counter;
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADD_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADD_MB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(add_mb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ incr)
{
__asm__ __volatile__(
"lock; add" ETHR_AINT_SUFFIX__ " %1, %0"
: "=m"(var->counter)
: "ir"(incr), "m"(var->counter)
: "memory");
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_INC_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_INC_MB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(inc_mb)(ETHR_ATMC_T__ *var)
{
__asm__ __volatile__(
"lock; inc" ETHR_AINT_SUFFIX__ " %0"
: "=m"(var->counter)
: "m"(var->counter)
: "memory");
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_DEC_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_DEC_MB 1
#endif
static ETHR_INLINE void
ETHR_NATMC_FUNC__(dec_mb)(ETHR_ATMC_T__ *var)
{
__asm__ __volatile__(
"lock; dec" ETHR_AINT_SUFFIX__ " %0"
: "=m"(var->counter)
: "m"(var->counter)
: "memory");
}
#if ETHR_INCLUDE_ATOMIC_IMPL__ == 4
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADD_RETURN_MB 1
#else
# define ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADD_RETURN_MB 1
#endif
static ETHR_INLINE ETHR_AINT_T__
ETHR_NATMC_FUNC__(add_return_mb)(ETHR_ATMC_T__ *var, ETHR_AINT_T__ incr)
{
ETHR_AINT_T__ tmp;
tmp = incr;
__asm__ __volatile__(
"lock; xadd" ETHR_AINT_SUFFIX__ " %0, %1" /* xadd didn't exist prior to the 486 */
: "=r"(tmp)
: "m"(var->counter), "0"(tmp)
: "memory");
/* now tmp is the atomic's previous value */
return tmp + incr;
}
#endif /* ETHR_TRY_INLINE_FUNCS */
#undef ETHR_NATMC_FUNC__
#undef ETHR_ATMC_T__
#undef ETHR_AINT_T__
#undef ETHR_AINT_SUFFIX__
#endif /* ETHR_INCLUDE_ATOMIC_IMPL__ */
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