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| Current File : //sys/ia64/include/atomic.h |
/*-
* 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/ia64/include/atomic.h 185163 2008-11-22 06:56:49Z marcel $
*/
#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
#define mb() __asm __volatile("mf")
#define wmb() mb()
#define rmb() mb()
/*
* Various simple arithmetic on memory which is atomic in the presence
* of interrupts and SMP safe.
*/
/*
* Everything is built out of cmpxchg.
*/
#define IA64_CMPXCHG(sz, sem, p, cmpval, newval, ret) \
__asm __volatile ( \
"mov ar.ccv=%2;;\n\t" \
"cmpxchg" #sz "." #sem " %0=%4,%3,ar.ccv\n\t" \
: "=r" (ret), "=m" (*p) \
: "r" ((uint64_t)cmpval), "r" (newval), "m" (*p) \
: "memory")
/*
* Some common forms of cmpxch.
*/
static __inline uint32_t
ia64_cmpxchg_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval)
{
uint32_t ret;
IA64_CMPXCHG(4, acq, p, cmpval, newval, ret);
return (ret);
}
static __inline uint32_t
ia64_cmpxchg_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval)
{
uint32_t ret;
IA64_CMPXCHG(4, rel, p, cmpval, newval, ret);
return (ret);
}
static __inline uint64_t
ia64_cmpxchg_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval)
{
uint64_t ret;
IA64_CMPXCHG(8, acq, p, cmpval, newval, ret);
return (ret);
}
static __inline uint64_t
ia64_cmpxchg_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval)
{
uint64_t ret;
IA64_CMPXCHG(8, rel, p, cmpval, newval, ret);
return (ret);
}
#define ATOMIC_STORE_LOAD(type, width, size) \
static __inline uint##width##_t \
ia64_ld_acq_##width(volatile uint##width##_t* p) \
{ \
uint##width##_t v; \
__asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \
: "m" (*p) : "memory"); \
return (v); \
} \
\
static __inline uint##width##_t \
atomic_load_acq_##width(volatile uint##width##_t* p) \
{ \
uint##width##_t v; \
__asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \
: "m" (*p) : "memory"); \
return (v); \
} \
\
static __inline uint##width##_t \
atomic_load_acq_##type(volatile uint##width##_t* p) \
{ \
uint##width##_t v; \
__asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \
: "m" (*p) : "memory"); \
return (v); \
} \
\
static __inline void \
ia64_st_rel_##width(volatile uint##width##_t* p, uint##width##_t v) \
{ \
__asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \
: "r" (v) : "memory"); \
} \
\
static __inline void \
atomic_store_rel_##width(volatile uint##width##_t* p, \
uint##width##_t v) \
{ \
__asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \
: "r" (v) : "memory"); \
} \
\
static __inline void \
atomic_store_rel_##type(volatile uint##width##_t* p, \
uint##width##_t v) \
{ \
__asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \
: "r" (v) : "memory"); \
}
ATOMIC_STORE_LOAD(char, 8, "1")
ATOMIC_STORE_LOAD(short, 16, "2")
ATOMIC_STORE_LOAD(int, 32, "4")
ATOMIC_STORE_LOAD(long, 64, "8")
#undef ATOMIC_STORE_LOAD
#define atomic_load_acq_ptr(p) \
((void *)atomic_load_acq_64((volatile uint64_t *)p))
#define atomic_store_rel_ptr(p, v) \
atomic_store_rel_64((volatile uint64_t *)p, (uint64_t)v)
#define IA64_ATOMIC(sz, type, name, width, op) \
static __inline type \
atomic_##name##_acq_##width(volatile type *p, type v) \
{ \
type old, ret; \
do { \
old = *p; \
IA64_CMPXCHG(sz, acq, p, old, old op v, ret); \
} while (ret != old); \
return (old); \
} \
\
static __inline type \
atomic_##name##_rel_##width(volatile type *p, type v) \
{ \
type old, ret; \
do { \
old = *p; \
IA64_CMPXCHG(sz, rel, p, old, old op v, ret); \
} while (ret != old); \
return (old); \
}
IA64_ATOMIC(1, uint8_t, set, 8, |)
IA64_ATOMIC(2, uint16_t, set, 16, |)
IA64_ATOMIC(4, uint32_t, set, 32, |)
IA64_ATOMIC(8, uint64_t, set, 64, |)
IA64_ATOMIC(1, uint8_t, clear, 8, &~)
IA64_ATOMIC(2, uint16_t, clear, 16, &~)
IA64_ATOMIC(4, uint32_t, clear, 32, &~)
IA64_ATOMIC(8, uint64_t, clear, 64, &~)
IA64_ATOMIC(1, uint8_t, add, 8, +)
IA64_ATOMIC(2, uint16_t, add, 16, +)
IA64_ATOMIC(4, uint32_t, add, 32, +)
IA64_ATOMIC(8, uint64_t, add, 64, +)
IA64_ATOMIC(1, uint8_t, subtract, 8, -)
IA64_ATOMIC(2, uint16_t, subtract, 16, -)
IA64_ATOMIC(4, uint32_t, subtract, 32, -)
IA64_ATOMIC(8, uint64_t, subtract, 64, -)
#undef IA64_ATOMIC
#define atomic_set_8 atomic_set_acq_8
#define atomic_clear_8 atomic_clear_acq_8
#define atomic_add_8 atomic_add_acq_8
#define atomic_subtract_8 atomic_subtract_acq_8
#define atomic_set_16 atomic_set_acq_16
#define atomic_clear_16 atomic_clear_acq_16
#define atomic_add_16 atomic_add_acq_16
#define atomic_subtract_16 atomic_subtract_acq_16
#define atomic_set_32 atomic_set_acq_32
#define atomic_clear_32 atomic_clear_acq_32
#define atomic_add_32 atomic_add_acq_32
#define atomic_subtract_32 atomic_subtract_acq_32
#define atomic_set_64 atomic_set_acq_64
#define atomic_clear_64 atomic_clear_acq_64
#define atomic_add_64 atomic_add_acq_64
#define atomic_subtract_64 atomic_subtract_acq_64
#define atomic_set_char atomic_set_8
#define atomic_clear_char atomic_clear_8
#define atomic_add_char atomic_add_8
#define atomic_subtract_char atomic_subtract_8
#define atomic_set_acq_char atomic_set_acq_8
#define atomic_clear_acq_char atomic_clear_acq_8
#define atomic_add_acq_char atomic_add_acq_8
#define atomic_subtract_acq_char atomic_subtract_acq_8
#define atomic_set_rel_char atomic_set_rel_8
#define atomic_clear_rel_char atomic_clear_rel_8
#define atomic_add_rel_char atomic_add_rel_8
#define atomic_subtract_rel_char atomic_subtract_rel_8
#define atomic_set_short atomic_set_16
#define atomic_clear_short atomic_clear_16
#define atomic_add_short atomic_add_16
#define atomic_subtract_short atomic_subtract_16
#define atomic_set_acq_short atomic_set_acq_16
#define atomic_clear_acq_short atomic_clear_acq_16
#define atomic_add_acq_short atomic_add_acq_16
#define atomic_subtract_acq_short atomic_subtract_acq_16
#define atomic_set_rel_short atomic_set_rel_16
#define atomic_clear_rel_short atomic_clear_rel_16
#define atomic_add_rel_short atomic_add_rel_16
#define atomic_subtract_rel_short atomic_subtract_rel_16
#define atomic_set_int atomic_set_32
#define atomic_clear_int atomic_clear_32
#define atomic_add_int atomic_add_32
#define atomic_subtract_int atomic_subtract_32
#define atomic_set_acq_int atomic_set_acq_32
#define atomic_clear_acq_int atomic_clear_acq_32
#define atomic_add_acq_int atomic_add_acq_32
#define atomic_subtract_acq_int atomic_subtract_acq_32
#define atomic_set_rel_int atomic_set_rel_32
#define atomic_clear_rel_int atomic_clear_rel_32
#define atomic_add_rel_int atomic_add_rel_32
#define atomic_subtract_rel_int atomic_subtract_rel_32
#define atomic_set_long atomic_set_64
#define atomic_clear_long atomic_clear_64
#define atomic_add_long atomic_add_64
#define atomic_subtract_long atomic_subtract_64
#define atomic_set_acq_long atomic_set_acq_64
#define atomic_clear_acq_long atomic_clear_acq_64
#define atomic_add_acq_long atomic_add_acq_64
#define atomic_subtract_acq_long atomic_subtract_acq_64
#define atomic_set_rel_long atomic_set_rel_64
#define atomic_clear_rel_long atomic_clear_rel_64
#define atomic_add_rel_long atomic_add_rel_64
#define atomic_subtract_rel_long atomic_subtract_rel_64
/* XXX Needs casting. */
#define atomic_set_ptr atomic_set_64
#define atomic_clear_ptr atomic_clear_64
#define atomic_add_ptr atomic_add_64
#define atomic_subtract_ptr atomic_subtract_64
#define atomic_set_acq_ptr atomic_set_acq_64
#define atomic_clear_acq_ptr atomic_clear_acq_64
#define atomic_add_acq_ptr atomic_add_acq_64
#define atomic_subtract_acq_ptr atomic_subtract_acq_64
#define atomic_set_rel_ptr atomic_set_rel_64
#define atomic_clear_rel_ptr atomic_clear_rel_64
#define atomic_add_rel_ptr atomic_add_rel_64
#define atomic_subtract_rel_ptr atomic_subtract_rel_64
#undef IA64_CMPXCHG
/*
* 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_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval)
{
return (ia64_cmpxchg_acq_32(p, cmpval, newval) == cmpval);
}
static __inline int
atomic_cmpset_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval)
{
return (ia64_cmpxchg_rel_32(p, cmpval, newval) == cmpval);
}
/*
* 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_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval)
{
return (ia64_cmpxchg_acq_64(p, cmpval, newval) == cmpval);
}
static __inline int
atomic_cmpset_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval)
{
return (ia64_cmpxchg_rel_64(p, cmpval, newval) == cmpval);
}
#define atomic_cmpset_32 atomic_cmpset_acq_32
#define atomic_cmpset_64 atomic_cmpset_acq_64
#define atomic_cmpset_int atomic_cmpset_32
#define atomic_cmpset_long atomic_cmpset_64
#define atomic_cmpset_acq_int atomic_cmpset_acq_32
#define atomic_cmpset_rel_int atomic_cmpset_rel_32
#define atomic_cmpset_acq_long atomic_cmpset_acq_64
#define atomic_cmpset_rel_long atomic_cmpset_rel_64
#define atomic_cmpset_acq_ptr(p, o, n) \
(atomic_cmpset_acq_64((volatile uint64_t *)p, (uint64_t)o, (uint64_t)n))
#define atomic_cmpset_ptr atomic_cmpset_acq_ptr
#define atomic_cmpset_rel_ptr(p, o, n) \
(atomic_cmpset_rel_64((volatile uint64_t *)p, (uint64_t)o, (uint64_t)n))
static __inline uint32_t
atomic_readandclear_32(volatile uint32_t* p)
{
uint32_t val;
do {
val = *p;
} while (!atomic_cmpset_32(p, val, 0));
return (val);
}
static __inline uint64_t
atomic_readandclear_64(volatile uint64_t* p)
{
uint64_t val;
do {
val = *p;
} while (!atomic_cmpset_64(p, val, 0));
return (val);
}
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_readandclear_long atomic_readandclear_64
#define atomic_readandclear_ptr atomic_readandclear_64
/*
* Atomically add the value of v to the integer pointed to by p and return
* the previous value of *p.
*
* XXX: Should we use the fetchadd instruction here?
*/
static __inline uint32_t
atomic_fetchadd_32(volatile uint32_t *p, uint32_t v)
{
uint32_t value;
do {
value = *p;
} while (!atomic_cmpset_32(p, value, value + v));
return (value);
}
#define atomic_fetchadd_int atomic_fetchadd_32
static __inline u_long
atomic_fetchadd_long(volatile u_long *p, u_long v)
{
u_long value;
do {
value = *p;
} while (!atomic_cmpset_64(p, value, value + v));
return (value);
}
#endif /* ! _MACHINE_ATOMIC_H_ */