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/*-
* Copyright (c) 2008 Marcel Moolenaar
* Copyright (c) 2001 Benno Rice
* Copyright (c) 2001 David E. O'Brien
* 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: release/9.1.0/sys/powerpc/include/atomic.h 222198 2011-05-22 20:55:54Z attilio $
*/
#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
#ifndef _SYS_CDEFS_H_
#error this file needs sys/cdefs.h as a prerequisite
#endif
#define __ATOMIC_BARRIER \
__asm __volatile("sync" : : : "memory")
#define mb() __ATOMIC_BARRIER
#define wmb() mb()
#define rmb() mb()
/*
* atomic_add(p, v)
* { *p += v; }
*/
#define __atomic_add_int(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" add %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_add_int */
#ifdef __powerpc64__
#define __atomic_add_long(p, v, t) \
__asm __volatile( \
"1: ldarx %0, 0, %2\n" \
" add %0, %3, %0\n" \
" stdcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_add_long */
#else
#define __atomic_add_long(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" add %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_add_long */
#endif
#define _ATOMIC_ADD(type) \
static __inline void \
atomic_add_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_add_##type(p, v, t); \
} \
\
static __inline void \
atomic_add_acq_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_add_##type(p, v, t); \
__ATOMIC_BARRIER; \
} \
\
static __inline void \
atomic_add_rel_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__ATOMIC_BARRIER; \
__atomic_add_##type(p, v, t); \
} \
/* _ATOMIC_ADD */
_ATOMIC_ADD(int)
_ATOMIC_ADD(long)
#define atomic_add_32 atomic_add_int
#define atomic_add_acq_32 atomic_add_acq_int
#define atomic_add_rel_32 atomic_add_rel_int
#ifdef __powerpc64__
#define atomic_add_64 atomic_add_long
#define atomic_add_acq_64 atomic_add_acq_long
#define atomic_add_rel_64 atomic_add_rel_long
#define atomic_add_ptr atomic_add_long
#define atomic_add_acq_ptr atomic_add_acq_long
#define atomic_add_rel_ptr atomic_add_rel_long
#else
#define atomic_add_ptr atomic_add_int
#define atomic_add_acq_ptr atomic_add_acq_int
#define atomic_add_rel_ptr atomic_add_rel_int
#endif
#undef _ATOMIC_ADD
#undef __atomic_add_long
#undef __atomic_add_int
/*
* atomic_clear(p, v)
* { *p &= ~v; }
*/
#define __atomic_clear_int(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" andc %0, %0, %3\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_clear_int */
#ifdef __powerpc64__
#define __atomic_clear_long(p, v, t) \
__asm __volatile( \
"1: ldarx %0, 0, %2\n" \
" andc %0, %0, %3\n" \
" stdcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_clear_long */
#else
#define __atomic_clear_long(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" andc %0, %0, %3\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_clear_long */
#endif
#define _ATOMIC_CLEAR(type) \
static __inline void \
atomic_clear_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_clear_##type(p, v, t); \
} \
\
static __inline void \
atomic_clear_acq_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_clear_##type(p, v, t); \
__ATOMIC_BARRIER; \
} \
\
static __inline void \
atomic_clear_rel_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__ATOMIC_BARRIER; \
__atomic_clear_##type(p, v, t); \
} \
/* _ATOMIC_CLEAR */
_ATOMIC_CLEAR(int)
_ATOMIC_CLEAR(long)
#define atomic_clear_32 atomic_clear_int
#define atomic_clear_acq_32 atomic_clear_acq_int
#define atomic_clear_rel_32 atomic_clear_rel_int
#ifdef __powerpc64__
#define atomic_clear_64 atomic_clear_long
#define atomic_clear_acq_64 atomic_clear_acq_long
#define atomic_clear_rel_64 atomic_clear_rel_long
#define atomic_clear_ptr atomic_clear_long
#define atomic_clear_acq_ptr atomic_clear_acq_long
#define atomic_clear_rel_ptr atomic_clear_rel_long
#else
#define atomic_clear_ptr atomic_clear_int
#define atomic_clear_acq_ptr atomic_clear_acq_int
#define atomic_clear_rel_ptr atomic_clear_rel_int
#endif
#undef _ATOMIC_CLEAR
#undef __atomic_clear_long
#undef __atomic_clear_int
/*
* atomic_cmpset(p, o, n)
*/
/* TODO -- see below */
/*
* atomic_load_acq(p)
*/
/* TODO -- see below */
/*
* atomic_readandclear(p)
*/
/* TODO -- see below */
/*
* atomic_set(p, v)
* { *p |= v; }
*/
#define __atomic_set_int(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" or %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_set_int */
#ifdef __powerpc64__
#define __atomic_set_long(p, v, t) \
__asm __volatile( \
"1: ldarx %0, 0, %2\n" \
" or %0, %3, %0\n" \
" stdcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_set_long */
#else
#define __atomic_set_long(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" or %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_set_long */
#endif
#define _ATOMIC_SET(type) \
static __inline void \
atomic_set_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_set_##type(p, v, t); \
} \
\
static __inline void \
atomic_set_acq_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_set_##type(p, v, t); \
__ATOMIC_BARRIER; \
} \
\
static __inline void \
atomic_set_rel_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__ATOMIC_BARRIER; \
__atomic_set_##type(p, v, t); \
} \
/* _ATOMIC_SET */
_ATOMIC_SET(int)
_ATOMIC_SET(long)
#define atomic_set_32 atomic_set_int
#define atomic_set_acq_32 atomic_set_acq_int
#define atomic_set_rel_32 atomic_set_rel_int
#ifdef __powerpc64__
#define atomic_set_64 atomic_set_long
#define atomic_set_acq_64 atomic_set_acq_long
#define atomic_set_rel_64 atomic_set_rel_long
#define atomic_set_ptr atomic_set_long
#define atomic_set_acq_ptr atomic_set_acq_long
#define atomic_set_rel_ptr atomic_set_rel_long
#else
#define atomic_set_ptr atomic_set_int
#define atomic_set_acq_ptr atomic_set_acq_int
#define atomic_set_rel_ptr atomic_set_rel_int
#endif
#undef _ATOMIC_SET
#undef __atomic_set_long
#undef __atomic_set_int
/*
* atomic_subtract(p, v)
* { *p -= v; }
*/
#define __atomic_subtract_int(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" subf %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_subtract_int */
#ifdef __powerpc64__
#define __atomic_subtract_long(p, v, t) \
__asm __volatile( \
"1: ldarx %0, 0, %2\n" \
" subf %0, %3, %0\n" \
" stdcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_subtract_long */
#else
#define __atomic_subtract_long(p, v, t) \
__asm __volatile( \
"1: lwarx %0, 0, %2\n" \
" subf %0, %3, %0\n" \
" stwcx. %0, 0, %2\n" \
" bne- 1b\n" \
: "=&r" (t), "=m" (*p) \
: "r" (p), "r" (v), "m" (*p) \
: "cc", "memory") \
/* __atomic_subtract_long */
#endif
#define _ATOMIC_SUBTRACT(type) \
static __inline void \
atomic_subtract_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_subtract_##type(p, v, t); \
} \
\
static __inline void \
atomic_subtract_acq_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__atomic_subtract_##type(p, v, t); \
__ATOMIC_BARRIER; \
} \
\
static __inline void \
atomic_subtract_rel_##type(volatile u_##type *p, u_##type v) { \
u_##type t; \
__ATOMIC_BARRIER; \
__atomic_subtract_##type(p, v, t); \
} \
/* _ATOMIC_SUBTRACT */
_ATOMIC_SUBTRACT(int)
_ATOMIC_SUBTRACT(long)
#define atomic_subtract_32 atomic_subtract_int
#define atomic_subtract_acq_32 atomic_subtract_acq_int
#define atomic_subtract_rel_32 atomic_subtract_rel_int
#ifdef __powerpc64__
#define atomic_subtract_64 atomic_subtract_long
#define atomic_subtract_acq_64 atomic_subract_acq_long
#define atomic_subtract_rel_64 atomic_subtract_rel_long
#define atomic_subtract_ptr atomic_subtract_long
#define atomic_subtract_acq_ptr atomic_subtract_acq_long
#define atomic_subtract_rel_ptr atomic_subtract_rel_long
#else
#define atomic_subtract_ptr atomic_subtract_int
#define atomic_subtract_acq_ptr atomic_subtract_acq_int
#define atomic_subtract_rel_ptr atomic_subtract_rel_int
#endif
#undef _ATOMIC_SUBTRACT
#undef __atomic_subtract_long
#undef __atomic_subtract_int
/*
* atomic_store_rel(p, v)
*/
/* TODO -- see below */
/*
* Old/original implementations that still need revisiting.
*/
static __inline u_int
atomic_readandclear_int(volatile u_int *addr)
{
u_int result,temp;
#ifdef __GNUCLIKE_ASM
__asm __volatile (
"\tsync\n" /* drain writes */
"1:\tlwarx %0, 0, %3\n\t" /* load old value */
"li %1, 0\n\t" /* load new value */
"stwcx. %1, 0, %3\n\t" /* attempt to store */
"bne- 1b\n\t" /* spin if failed */
: "=&r"(result), "=&r"(temp), "=m" (*addr)
: "r" (addr), "m" (*addr)
: "cc", "memory");
#endif
return (result);
}
#ifdef __powerpc64__
static __inline u_long
atomic_readandclear_long(volatile u_long *addr)
{
u_long result,temp;
#ifdef __GNUCLIKE_ASM
__asm __volatile (
"\tsync\n" /* drain writes */
"1:\tldarx %0, 0, %3\n\t" /* load old value */
"li %1, 0\n\t" /* load new value */
"stdcx. %1, 0, %3\n\t" /* attempt to store */
"bne- 1b\n\t" /* spin if failed */
: "=&r"(result), "=&r"(temp), "=m" (*addr)
: "r" (addr), "m" (*addr)
: "cc", "memory");
#endif
return (result);
}
#endif
#define atomic_readandclear_32 atomic_readandclear_int
#ifdef __powerpc64__
#define atomic_readandclear_64 atomic_readandclear_long
#define atomic_readandclear_ptr atomic_readandclear_long
#else
static __inline u_long
atomic_readandclear_long(volatile u_long *addr)
{
return ((u_long)atomic_readandclear_int((volatile u_int *)addr));
}
#define atomic_readandclear_ptr atomic_readandclear_int
#endif
/*
* We assume that a = b will do atomic loads and stores.
*/
#define ATOMIC_STORE_LOAD(TYPE) \
static __inline u_##TYPE \
atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
{ \
u_##TYPE v; \
\
v = *p; \
__ATOMIC_BARRIER; \
return (v); \
} \
\
static __inline void \
atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \
{ \
__ATOMIC_BARRIER; \
*p = v; \
}
ATOMIC_STORE_LOAD(int)
#define atomic_load_acq_32 atomic_load_acq_int
#define atomic_store_rel_32 atomic_store_rel_int
#ifdef __powerpc64__
ATOMIC_STORE_LOAD(long)
#define atomic_load_acq_64 atomic_load_acq_long
#define atomic_store_rel_64 atomic_store_rel_long
#define atomic_load_acq_ptr atomic_load_acq_long
#define atomic_store_rel_ptr atomic_store_rel_long
#else
static __inline u_long
atomic_load_acq_long(volatile u_long *addr)
{
return ((u_long)atomic_load_acq_int((volatile u_int *)addr));
}
static __inline void
atomic_store_rel_long(volatile u_long *addr, u_long val)
{
atomic_store_rel_int((volatile u_int *)addr, (u_int)val);
}
#define atomic_load_acq_ptr atomic_load_acq_int
#define atomic_store_rel_ptr atomic_store_rel_int
#endif
#undef ATOMIC_STORE_LOAD
/*
* Atomically compare the value stored at *p with cmpval and if the
* two values are equal, update the value of *p with newval. Returns
* zero if the compare failed, nonzero otherwise.
*/
static __inline int
atomic_cmpset_int(volatile u_int* p, u_int cmpval, u_int newval)
{
int ret;
#ifdef __GNUCLIKE_ASM
__asm __volatile (
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
"cmplw %3, %0\n\t" /* compare */
"bne 2f\n\t" /* exit if not equal */
"stwcx. %4, 0, %2\n\t" /* attempt to store */
"bne- 1b\n\t" /* spin if failed */
"li %0, 1\n\t" /* success - retval = 1 */
"b 3f\n\t" /* we've succeeded */
"2:\n\t"
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
"li %0, 0\n\t" /* failure - retval = 0 */
"3:\n\t"
: "=&r" (ret), "=m" (*p)
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
: "cc", "memory");
#endif
return (ret);
}
static __inline int
atomic_cmpset_long(volatile u_long* p, u_long cmpval, u_long newval)
{
int ret;
#ifdef __GNUCLIKE_ASM
__asm __volatile (
#ifdef __powerpc64__
"1:\tldarx %0, 0, %2\n\t" /* load old value */
"cmpld %3, %0\n\t" /* compare */
"bne 2f\n\t" /* exit if not equal */
"stdcx. %4, 0, %2\n\t" /* attempt to store */
#else
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
"cmplw %3, %0\n\t" /* compare */
"bne 2f\n\t" /* exit if not equal */
"stwcx. %4, 0, %2\n\t" /* attempt to store */
#endif
"bne- 1b\n\t" /* spin if failed */
"li %0, 1\n\t" /* success - retval = 1 */
"b 3f\n\t" /* we've succeeded */
"2:\n\t"
#ifdef __powerpc64__
"stdcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
#else
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
#endif
"li %0, 0\n\t" /* failure - retval = 0 */
"3:\n\t"
: "=&r" (ret), "=m" (*p)
: "r" (p), "r" (cmpval), "r" (newval), "m" (*p)
: "cc", "memory");
#endif
return (ret);
}
static __inline int
atomic_cmpset_acq_int(volatile u_int *p, u_int cmpval, u_int newval)
{
int retval;
retval = atomic_cmpset_int(p, cmpval, newval);
__ATOMIC_BARRIER;
return (retval);
}
static __inline int
atomic_cmpset_rel_int(volatile u_int *p, u_int cmpval, u_int newval)
{
__ATOMIC_BARRIER;
return (atomic_cmpset_int(p, cmpval, newval));
}
static __inline int
atomic_cmpset_acq_long(volatile u_long *p, u_long cmpval, u_long newval)
{
u_long retval;
retval = atomic_cmpset_long(p, cmpval, newval);
__ATOMIC_BARRIER;
return (retval);
}
static __inline int
atomic_cmpset_rel_long(volatile u_long *p, u_long cmpval, u_long newval)
{
__ATOMIC_BARRIER;
return (atomic_cmpset_long(p, cmpval, newval));
}
#define atomic_cmpset_32 atomic_cmpset_int
#define atomic_cmpset_acq_32 atomic_cmpset_acq_int
#define atomic_cmpset_rel_32 atomic_cmpset_rel_int
#ifdef __powerpc64__
#define atomic_cmpset_64 atomic_cmpset_long
#define atomic_cmpset_acq_64 atomic_cmpset_acq_long
#define atomic_cmpset_rel_64 atomic_cmpset_rel_long
#define atomic_cmpset_ptr atomic_cmpset_long
#define atomic_cmpset_acq_ptr atomic_cmpset_acq_long
#define atomic_cmpset_rel_ptr atomic_cmpset_rel_long
#else
#define atomic_cmpset_ptr atomic_cmpset_int
#define atomic_cmpset_acq_ptr atomic_cmpset_acq_int
#define atomic_cmpset_rel_ptr atomic_cmpset_rel_int
#endif
static __inline u_int
atomic_fetchadd_int(volatile u_int *p, u_int v)
{
u_int value;
do {
value = *p;
} while (!atomic_cmpset_int(p, value, value + v));
return (value);
}
static __inline u_long
atomic_fetchadd_long(volatile u_long *p, u_long v)
{
u_long value;
do {
value = *p;
} while (!atomic_cmpset_long(p, value, value + v));
return (value);
}
#define atomic_fetchadd_32 atomic_fetchadd_int
#ifdef __powerpc64__
#define atomic_fetchadd_64 atomic_fetchadd_long
#endif
#endif /* ! _MACHINE_ATOMIC_H_ */