atomic/atomic_alpha.h
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 /* 
  * Copyright (C) 2006 iptelorg GmbH
  *
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  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
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  *
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  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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  */
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 /** 
  * @file
  * @brief Atomic operations and memory barriers (alpha specific)
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  *
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  * Atomic operations and memory barriers (alpha specific)
  * \warning atomic ops do not include memory barriers, see atomic_ops.h
  * for more details.
  * 
  * Config defines:
  * - NOSMP 
  * - __CPU_alpha
  * @ingroup atomic
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  */
 /* 
  * History:
  * --------
  *  2006-03-31  created by andrei
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  *  2007-05-10  added atomic_add & atomic_cmpxchg (andrei)
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  *  2007-05-29  added membar_depends(), membar_*_atomic_op and
  *                membar_*_atomic_setget (andrei)
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  */
 
 
 #ifndef _atomic_alpha_h
 #define _atomic_alpha_h
 
 #define HAVE_ASM_INLINE_ATOMIC_OPS
 #define HAVE_ASM_INLINE_MEMBAR
 
 #warning alpha atomic code was not tested, please report problems to \
 		serdev@iptel.org or andrei@iptel.org
 
 #ifdef NOSMP
 #define membar() asm volatile ("" : : : "memory") /* gcc do not cache barrier*/
 #define membar_read()  membar()
 #define membar_write() membar()
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 #define membar_depends()  do {} while(0) /* really empty, not even a cc bar. */
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 /* lock barriers: empty, not needed for NOSMP; the lock/unlock should already
  * contain gcc barriers*/
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 #define membar_enter_lock() do {} while(0)
 #define membar_leave_lock() do {} while(0)
 /* membars after or before atomic_ops or atomic_setget -> use these or
  *  mb_<atomic_op_name>() if you need a memory barrier in one of these
  *  situations (on some archs where the atomic operations imply memory
  *   barriers is better to use atomic_op_x(); membar_atomic_op() then
  *    atomic_op_x(); membar()) */
 #define membar_atomic_op()				membar()
 #define membar_atomic_setget()			membar()
 #define membar_write_atomic_op()		membar_write()
 #define membar_write_atomic_setget()	membar_write()
 #define membar_read_atomic_op()			membar_read()
 #define membar_read_atomic_setget()		membar_read()
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 #else
 
 #define membar()		asm volatile ("    mb \n\t" : : : "memory" ) 
 #define membar_read()	membar()
 #define membar_write()	asm volatile ("    wmb \n\t" : : : "memory" )
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 #define membar_depends()	asm volatile ("mb \n\t" : : : "memory" )
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 #define membar_enter_lock() asm volatile("mb \n\t" : : : "memory")
 #define membar_leave_lock() asm volatile("mb \n\t" : : : "memory")
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 /* membars after or before atomic_ops or atomic_setget -> use these or
  *  mb_<atomic_op_name>() if you need a memory barrier in one of these
  *  situations (on some archs where the atomic operations imply memory
  *   barriers is better to use atomic_op_x(); membar_atomic_op() then
  *    atomic_op_x(); membar()) */
 #define membar_atomic_op()				membar()
 #define membar_atomic_setget()			membar()
 #define membar_write_atomic_op()		membar_write()
 #define membar_write_atomic_setget()	membar_write()
 #define membar_read_atomic_op()			membar_read()
 #define membar_read_atomic_setget()		membar_read()
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 #endif /* NOSMP */
 
 
 
 /* main asm block 
  * if store failes, jump _forward_ (optimization, because back jumps are
  *  always predicted to happen on alpha )*/
 #define ATOMIC_ASM_OP00_int(op) \
 			"1:   ldl_l %0, %2 \n\t" \
 			"     " op "\n\t" \
 			"     stl_c %0, %2 \n\t" \
 			"     beq %0, 2f \n\t" \
 			".subsection 2 \n\t" \
 			"2:   br 1b \n\t" \
 			".previous \n\t"
 
 /* as above, but output in %1 instead of %0 (%0 is not clobbered) */
 #define ATOMIC_ASM_OP01_int(op) \
 			"1:   ldl_l %0, %3 \n\t" \
 			"     " op "\n\t" \
 			"     stl_c %1, %3 \n\t" \
 			"     beq %1, 2f \n\t" \
 			".subsection 2 \n\t" \
 			"2:   br 1b \n\t" \
 			".previous \n\t"
 
 #define ATOMIC_ASM_OP00_long(op) \
 			"1:   ldq_l %0, %2 \n\t" \
 			"     " op "\n\t" \
 			"     stq_c %0, %2 \n\t" \
 			"     beq %0, 2f \n\t" \
 			".subsection 2 \n\t" \
 			"2:   br 1b \n\t" \
 			".previous \n\t"
 
 /* as above, but output in %1 instead of %0 (%0 is not clobbered) */
 #define ATOMIC_ASM_OP01_long(op) \
 			"1:   ldq_l %0, %3 \n\t" \
 			"     " op "\n\t" \
 			"     stq_c %1, %3 \n\t" \
 			"     beq %1, 2f \n\t" \
 			".subsection 2 \n\t" \
 			"2:   br 1b \n\t" \
 			".previous \n\t"
 
 
 
 /* input in %0, output in %0 */
 #define ATOMIC_FUNC_DECL0_0(NAME, OP, P_TYPE, RET_TYPE, RET_EXPR) \
 	inline static RET_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var) \
 	{ \
 		P_TYPE ret; \
 		asm volatile( \
 			ATOMIC_ASM_OP00_##P_TYPE(OP) : "=&r"(ret), "=m"(*var) : "m"(*var) \
 			); \
 		return RET_EXPR; \
 	}
 
 
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 #if defined __GNUC__ &&  __GNUC__ < 3 && __GNUC_MINOR__ < 9
 #define ATOMIC_FUNC_DECL01_1(NAME, OP, P_TYPE, RET_TYPE, RET_EXPR) \
 	inline static RET_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var, \
 														P_TYPE v ) \
 	{ \
 		P_TYPE ret; \
 		asm volatile( \
 			ATOMIC_ASM_OP01_##P_TYPE(OP) \
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 			: "=&r"(ret), "=r"(v), "=m"(*var)  : "m"(*var), "1"(v) \
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 			); \
 		return RET_EXPR; \
 	}
 #else
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 /* input in %0, and %1 (param), output in %1,  %0 goes in ret */
 #define ATOMIC_FUNC_DECL01_1(NAME, OP, P_TYPE, RET_TYPE, RET_EXPR) \
 	inline static RET_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var, \
 														P_TYPE v ) \
 	{ \
 		P_TYPE ret; \
 		asm volatile( \
 			ATOMIC_ASM_OP01_##P_TYPE(OP) \
 			: "=&r"(ret), "+r"(v), "=m"(*var)  : "m"(*var) \
 			); \
 		return RET_EXPR; \
 	}
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 #endif /* gcc && gcc version < 2.9 */
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 /* input in %0, output in %1, %0 goes in ret */
 #define ATOMIC_FUNC_DECL0_1(NAME, OP, P_TYPE, RET_TYPE, RET_EXPR) \
 	inline static RET_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var) \
 	{ \
 		P_TYPE ret, tmp; \
 		asm volatile( \
 			ATOMIC_ASM_OP01_##P_TYPE(OP) \
 			: "=&r"(ret), "=&r"(tmp), "=m"(*var)  : "m"(*var) \
 			); \
 		return RET_EXPR; \
 	}
 
 
 /* input in %0 and %3 (param), output in %0 */
 #define ATOMIC_FUNC_DECL03_0(NAME, OP, P_TYPE, RET_TYPE, RET_EXPR) \
 	inline static RET_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var, \
 														P_TYPE v) \
 	{ \
 		P_TYPE ret; \
 		asm volatile( \
 			ATOMIC_ASM_OP00_##P_TYPE(OP) \
 			: "=&r"(ret), "=m"(*var)  : "m"(*var), "r"(v) \
 			); \
 		return RET_EXPR; \
 	}
 
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 /* input in %0 and %3 (param), output in %0 */
 /* cmpxchg var in %1, old in %0, new_v in %
  * makes the xchg if old==*var
  * returns initial *var (so if ret==old => new_v was written into var)*/
 #define ATOMIC_CMPXCHG_DECL(NAME,  P_TYPE) \
 	inline static P_TYPE atomic_##NAME##_##P_TYPE (volatile P_TYPE *var, \
 														P_TYPE old, \
 														P_TYPE new_v) \
 	{ \
 		P_TYPE ret; \
 		P_TYPE tmp; \
 		asm volatile( \
 			ATOMIC_ASM_OP01_##P_TYPE("subq  %0, %5, %2 \n\t bne %2, 3f")\
 			"3:    \n\t" \
 			: "=&r"(ret), "=&r"(new_v), "=r"(tmp), "=m"(*var)  :\
 				"m"(*var), "r"(old), "1"(new_v) :"cc" \
 			); \
 		return ret; \
 	}
 
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 ATOMIC_FUNC_DECL0_0(inc, "addl %0, 1, %0", int, void, /* no return */ )
 ATOMIC_FUNC_DECL0_0(dec, "subl %0, 1, %0", int, void, /* no return */ )
 ATOMIC_FUNC_DECL03_0(and, "and %0, %3, %0", int, void, /* no return */ )
 ATOMIC_FUNC_DECL03_0(or,  "bis %0, %3, %0", int, void, /* no return */ )
 ATOMIC_FUNC_DECL0_1(inc_and_test, "addl %0, 1, %1", int, int, (ret+1)==0 )
 ATOMIC_FUNC_DECL0_1(dec_and_test, "subl %0, 1, %1", int, int, (ret-1)==0 )
 ATOMIC_FUNC_DECL01_1(get_and_set, "" /* nothing needed */, int, int, ret )
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 ATOMIC_CMPXCHG_DECL(cmpxchg, int )
 ATOMIC_FUNC_DECL01_1(add, "addl %1, %0, %1", int, int, ret+v)
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 ATOMIC_FUNC_DECL0_0(inc, "addq %0, 1, %0", long, void, /* no return */ )
 ATOMIC_FUNC_DECL0_0(dec, "subq %0, 1, %0", long, void, /* no return */ )
 ATOMIC_FUNC_DECL03_0(and, "and %0, %3, %0", long, void, /* no return */ )
 ATOMIC_FUNC_DECL03_0(or,  "bis %0, %3, %0", long, void, /* no return */ )
 ATOMIC_FUNC_DECL0_1(inc_and_test, "addq %0, 1, %1", long, long, (ret+1)==0 )
 ATOMIC_FUNC_DECL0_1(dec_and_test, "subq %0, 1, %1", long, long, (ret-1)==0 )
 ATOMIC_FUNC_DECL01_1(get_and_set, "" /* nothing needed */, long, long, ret )
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 ATOMIC_CMPXCHG_DECL(cmpxchg, long )
 ATOMIC_FUNC_DECL01_1(add, "addq %1, %0, %1", long, long, ret+v)
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 #define atomic_inc(var) atomic_inc_int(&(var)->val)
 #define atomic_dec(var) atomic_dec_int(&(var)->val)
 #define atomic_and(var, mask) atomic_and_int(&(var)->val, (mask))
 #define atomic_or(var, mask)  atomic_or_int(&(var)->val, (mask))
 #define atomic_dec_and_test(var) atomic_dec_and_test_int(&(var)->val)
 #define atomic_inc_and_test(var) atomic_inc_and_test_int(&(var)->val)
 #define atomic_get_and_set(var, i) atomic_get_and_set_int(&(var)->val, i)
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 #define atomic_cmpxchg(var, old, new_v) \
 		atomic_cmpxchg_int(&(var)->val, old, new_v)
 #define atomic_add(var, v) atomic_add_int(&(var)->val, (v))
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 /* with integrated membar */
 
 #define mb_atomic_set_int(v, i) \
 	do{ \
 		membar(); \
 		atomic_set_int(v, i); \
 	}while(0)
 
 
 
 inline static int mb_atomic_get_int(volatile int* v)
 {
 	membar();
 	return atomic_get_int(v);
 }
 
 
 #define mb_atomic_inc_int(v) \
 	do{ \
 		membar(); \
 		atomic_inc_int(v); \
 	}while(0)
 
 #define mb_atomic_dec_int(v) \
 	do{ \
 		membar(); \
 		atomic_dec_int(v); \
 	}while(0)
 
 #define mb_atomic_or_int(v, m) \
 	do{ \
 		membar(); \
 		atomic_or_int(v, m); \
 	}while(0)
 
 #define mb_atomic_and_int(v, m) \
 	do{ \
 		membar(); \
 		atomic_and_int(v, m); \
 	}while(0)
 
 inline static int mb_atomic_inc_and_test_int(volatile int* v)
 {
 	membar();
 	return atomic_inc_and_test_int(v);
 }
 
 inline static int mb_atomic_dec_and_test_int(volatile int* v)
 {
 	membar();
 	return atomic_dec_and_test_int(v);
 }
 
 
 inline static int mb_atomic_get_and_set_int(volatile int* v, int i)
 {
 	membar();
 	return atomic_get_and_set_int(v, i);
 }
 
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 inline static int mb_atomic_cmpxchg_int(volatile int* v, int o, int n)
 {
 	membar();
 	return atomic_cmpxchg_int(v, o, n);
 }
 
 inline static int mb_atomic_add_int(volatile int* v, int i)
 {
 	membar();
 	return atomic_add_int(v, i);
 }
 
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 #define mb_atomic_set_long(v, i) \
 	do{ \
 		membar(); \
 		atomic_set_long(v, i); \
 	}while(0)
 
 
 
 inline static long mb_atomic_get_long(volatile long* v)
 {
 	membar();
 	return atomic_get_long(v);
 }
 
 
 #define mb_atomic_inc_long(v) \
 	do{ \
 		membar(); \
 		atomic_inc_long(v); \
 	}while(0)
 
 
 #define mb_atomic_dec_long(v) \
 	do{ \
 		membar(); \
 		atomic_dec_long(v); \
 	}while(0)
 
 #define mb_atomic_or_long(v, m) \
 	do{ \
 		membar(); \
 		atomic_or_long(v, m); \
 	}while(0)
 
 #define mb_atomic_and_long(v, m) \
 	do{ \
 		membar(); \
 		atomic_and_long(v, m); \
 	}while(0)
 
 inline static long mb_atomic_inc_and_test_long(volatile long* v)
 {
 	membar();
 	return atomic_inc_and_test_long(v);
 }
 
 inline static long mb_atomic_dec_and_test_long(volatile long* v)
 {
 	membar();
 	return atomic_dec_and_test_long(v);
 }
 
 
 inline static long mb_atomic_get_and_set_long(volatile long* v, long l)
 {
 	membar();
 	return atomic_get_and_set_long(v, l);
 }
 
 
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 inline static long mb_atomic_cmpxchg_long(volatile long* v, long o, long n)
 {
 	membar();
 	return atomic_cmpxchg_long(v, o, n);
 }
 
 inline static long mb_atomic_add_long(volatile long* v, long i)
 {
 	membar();
 	return atomic_add_long(v, i);
 }
 
 
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 #define mb_atomic_inc(var) mb_atomic_inc_int(&(var)->val)
 #define mb_atomic_dec(var) mb_atomic_dec_int(&(var)->val)
 #define mb_atomic_and(var, mask) mb_atomic_and_int(&(var)->val, (mask))
 #define mb_atomic_or(var, mask)  mb_atomic_or_int(&(var)->val, (mask))
 #define mb_atomic_dec_and_test(var) mb_atomic_dec_and_test_int(&(var)->val)
 #define mb_atomic_inc_and_test(var) mb_atomic_inc_and_test_int(&(var)->val)
 #define mb_atomic_get(var)	mb_atomic_get_int(&(var)->val)
 #define mb_atomic_set(var, i)	mb_atomic_set_int(&(var)->val, i)
 #define mb_atomic_get_and_set(var, i) mb_atomic_get_and_set_int(&(var)->val, i)
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 #define mb_atomic_cmpxchg(var, o, n) mb_atomic_cmpxchg_int(&(var)->val, o, n)
 #define mb_atomic_add(var, i) mb_atomic_add_int(&(var)->val, i)
 
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 #endif