WebSVN – Kolibri OS – Diff – /drivers/include/asm/atomic.h



 * atomic_read - read atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically reads the value of @v.
 */
static __always_inline int atomic_read(const atomic_t *v)
{
	return READ_ONCE((v)->counter);
}

 
/**
 * atomic_set - set atomic variable
 * @v: pointer of type atomic_t
 * @i: required value
 *
 * Atomically sets the value of @v to @i.
 */
static __always_inline void atomic_set(atomic_t *v, int i)
{
	WRITE_ONCE(v->counter, i);

}
 
/**
 * atomic_add - add integer to atomic variable
 * @i: integer value to add
 * @v: pointer of type atomic_t
 *
 * Atomically adds @i to @v.
 */
static __always_inline void atomic_add(int i, atomic_t *v)
{
	asm volatile(LOCK_PREFIX "addl %1,%0"
		     : "+m" (v->counter)

 * @i: integer value to subtract
 * @v: pointer of type atomic_t
 *
 * Atomically subtracts @i from @v.
 */
static __always_inline void atomic_sub(int i, atomic_t *v)
{
	asm volatile(LOCK_PREFIX "subl %1,%0"
		     : "+m" (v->counter)
		     : "ir" (i));
}

 *
 * Atomically subtracts @i from @v and returns
 * true if the result is zero, or false for all
 * other cases.
 */
static __always_inline int atomic_sub_and_test(int i, atomic_t *v)
{
	GEN_BINARY_RMWcc(LOCK_PREFIX "subl", v->counter, "er", i, "%0", "e");
}

 
/**
 * atomic_inc - increment atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1.
 */
static __always_inline void atomic_inc(atomic_t *v)
{
	asm volatile(LOCK_PREFIX "incl %0"
		     : "+m" (v->counter));

 * atomic_dec - decrement atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically decrements @v by 1.
 */
static __always_inline void atomic_dec(atomic_t *v)
{
	asm volatile(LOCK_PREFIX "decl %0"
		     : "+m" (v->counter));
}

 *
 * Atomically decrements @v by 1 and
 * returns true if the result is 0, or false for all other
 * cases.
 */
static __always_inline int atomic_dec_and_test(atomic_t *v)
{
	GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");
}

 

 *
 * Atomically increments @v by 1
 * and returns true if the result is zero, or false for all
 * other cases.
 */
static __always_inline int atomic_inc_and_test(atomic_t *v)
{
	GEN_UNARY_RMWcc(LOCK_PREFIX "incl", v->counter, "%0", "e");
}

 

 *
 * Atomically adds @i to @v and returns true
 * if the result is negative, or false when
 * result is greater than or equal to zero.
 */
static __always_inline int atomic_add_negative(int i, atomic_t *v)
{
	GEN_BINARY_RMWcc(LOCK_PREFIX "addl", v->counter, "er", i, "%0", "s");
}

 

 * @i: integer value to add
 * @v: pointer of type atomic_t
 *
 * Atomically adds @i to @v and returns @i + @v
 */
static __always_inline int atomic_add_return(int i, atomic_t *v)
{
	return i + xadd(&v->counter, i);
}

 

 * @v: pointer of type atomic_t
 * @i: integer value to subtract
 *
 * Atomically subtracts @i from @v and returns @v - @i
 */
static __always_inline int atomic_sub_return(int i, atomic_t *v)
{
	return atomic_add_return(-i, v);
}

 
#define atomic_inc_return(v)  (atomic_add_return(1, v))

#define atomic_dec_return(v)  (atomic_sub_return(1, v))
 
static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{

	return cmpxchg(&v->counter, old, new);
}
 
static inline int atomic_xchg(atomic_t *v, int new)

{
	return xchg(&v->counter, new);
}
 
#define ATOMIC_OP(op)							\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	asm volatile(LOCK_PREFIX #op"l %1,%0"				\
			: "+m" (v->counter)				\
			: "ir" (i)					\
			: "memory");					\
}
 
ATOMIC_OP(and)
ATOMIC_OP(or)
ATOMIC_OP(xor)
 
#undef ATOMIC_OP
 
/**
 * __atomic_add_unless - add unless the number is already a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as @v was not already @u.
 * Returns the old value of @v.
 */
static __always_inline int __atomic_add_unless(atomic_t *v, int a, int u)
{

 * @v: pointer to type int
 *
 * Atomically adds 1 to @v
 * Returns the new value of @u
 */
static __always_inline short int atomic_inc_short(short int *v)
{
	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
	return *v;
}

 
 
 
 
 
 
 
 
 
 
 
#ifdef CONFIG_X86_32
# include 
#else
# include 

Rev 5270	Rev 6082
Line 20...	Line 20...
20	* atomic_read - read atomic variable	20	* atomic_read - read atomic variable
21	* @v: pointer of type atomic_t	21	* @v: pointer of type atomic_t
22	*	22	*
23	* Atomically reads the value of @v.	23	* Atomically reads the value of @v.
24	*/	24	*/
25	static inline int atomic_read(const atomic_t *v)	25	static __always_inline int atomic_read(const atomic_t *v)
26	{	26	{
27	return ACCESS_ONCE((v)->counter);	27	return READ_ONCE((v)->counter);
28	}	28	}
Line 29...	Line 29...
29		29
30	/**	30	/**
31	* atomic_set - set atomic variable	31	* atomic_set - set atomic variable
32	* @v: pointer of type atomic_t	32	* @v: pointer of type atomic_t
33	* @i: required value	33	* @i: required value
34	*	34	*
35	* Atomically sets the value of @v to @i.	35	* Atomically sets the value of @v to @i.
36	*/	36	*/
37	static inline void atomic_set(atomic_t *v, int i)	37	static __always_inline void atomic_set(atomic_t *v, int i)
38	{	38	{
39	v->counter = i;	39	WRITE_ONCE(v->counter, i);
Line 40...	Line 40...
40	}	40	}
41		41
42	/**	42	/**
43	* atomic_add - add integer to atomic variable	43	* atomic_add - add integer to atomic variable
44	* @i: integer value to add	44	* @i: integer value to add
45	* @v: pointer of type atomic_t	45	* @v: pointer of type atomic_t
46	*	46	*
47	* Atomically adds @i to @v.	47	* Atomically adds @i to @v.
48	*/	48	*/
49	static inline void atomic_add(int i, atomic_t *v)	49	static __always_inline void atomic_add(int i, atomic_t *v)
50	{	50	{
51	asm volatile(LOCK_PREFIX "addl %1,%0"	51	asm volatile(LOCK_PREFIX "addl %1,%0"
52	: "+m" (v->counter)	52	: "+m" (v->counter)
Line 58...	Line 58...
58	* @i: integer value to subtract	58	* @i: integer value to subtract
59	* @v: pointer of type atomic_t	59	* @v: pointer of type atomic_t
60	*	60	*
61	* Atomically subtracts @i from @v.	61	* Atomically subtracts @i from @v.
62	*/	62	*/
63	static inline void atomic_sub(int i, atomic_t *v)	63	static __always_inline void atomic_sub(int i, atomic_t *v)
64	{	64	{
65	asm volatile(LOCK_PREFIX "subl %1,%0"	65	asm volatile(LOCK_PREFIX "subl %1,%0"
66	: "+m" (v->counter)	66	: "+m" (v->counter)
67	: "ir" (i));	67	: "ir" (i));
68	}	68	}
Line 74...	Line 74...
74	*	74	*
75	* Atomically subtracts @i from @v and returns	75	* Atomically subtracts @i from @v and returns
76	* true if the result is zero, or false for all	76	* true if the result is zero, or false for all
77	* other cases.	77	* other cases.
78	*/	78	*/
79	static inline int atomic_sub_and_test(int i, atomic_t *v)	79	static __always_inline int atomic_sub_and_test(int i, atomic_t *v)
80	{	80	{
81	GEN_BINARY_RMWcc(LOCK_PREFIX "subl", v->counter, "er", i, "%0", "e");	81	GEN_BINARY_RMWcc(LOCK_PREFIX "subl", v->counter, "er", i, "%0", "e");
82	}	82	}
Line 83...	Line 83...
83		83
84	/**	84	/**
85	* atomic_inc - increment atomic variable	85	* atomic_inc - increment atomic variable
86	* @v: pointer of type atomic_t	86	* @v: pointer of type atomic_t
87	*	87	*
88	* Atomically increments @v by 1.	88	* Atomically increments @v by 1.
89	*/	89	*/
90	static inline void atomic_inc(atomic_t *v)	90	static __always_inline void atomic_inc(atomic_t *v)
91	{	91	{
92	asm volatile(LOCK_PREFIX "incl %0"	92	asm volatile(LOCK_PREFIX "incl %0"
93	: "+m" (v->counter));	93	: "+m" (v->counter));
Line 97...	Line 97...
97	* atomic_dec - decrement atomic variable	97	* atomic_dec - decrement atomic variable
98	* @v: pointer of type atomic_t	98	* @v: pointer of type atomic_t
99	*	99	*
100	* Atomically decrements @v by 1.	100	* Atomically decrements @v by 1.
101	*/	101	*/
102	static inline void atomic_dec(atomic_t *v)	102	static __always_inline void atomic_dec(atomic_t *v)
103	{	103	{
104	asm volatile(LOCK_PREFIX "decl %0"	104	asm volatile(LOCK_PREFIX "decl %0"
105	: "+m" (v->counter));	105	: "+m" (v->counter));
106	}	106	}
Line 111...	Line 111...
111	*	111	*
112	* Atomically decrements @v by 1 and	112	* Atomically decrements @v by 1 and
113	* returns true if the result is 0, or false for all other	113	* returns true if the result is 0, or false for all other
114	* cases.	114	* cases.
115	*/	115	*/
116	static inline int atomic_dec_and_test(atomic_t *v)	116	static __always_inline int atomic_dec_and_test(atomic_t *v)
117	{	117	{
118	GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");	118	GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");
119	}	119	}
Line 120...	Line 120...
120		120
Line 124...	Line 124...
124	*	124	*
125	* Atomically increments @v by 1	125	* Atomically increments @v by 1
126	* and returns true if the result is zero, or false for all	126	* and returns true if the result is zero, or false for all
127	* other cases.	127	* other cases.
128	*/	128	*/
129	static inline int atomic_inc_and_test(atomic_t *v)	129	static __always_inline int atomic_inc_and_test(atomic_t *v)
130	{	130	{
131	GEN_UNARY_RMWcc(LOCK_PREFIX "incl", v->counter, "%0", "e");	131	GEN_UNARY_RMWcc(LOCK_PREFIX "incl", v->counter, "%0", "e");
132	}	132	}
Line 133...	Line 133...
133		133
Line 138...	Line 138...
138	*	138	*
139	* Atomically adds @i to @v and returns true	139	* Atomically adds @i to @v and returns true
140	* if the result is negative, or false when	140	* if the result is negative, or false when
141	* result is greater than or equal to zero.	141	* result is greater than or equal to zero.
142	*/	142	*/
143	static inline int atomic_add_negative(int i, atomic_t *v)	143	static __always_inline int atomic_add_negative(int i, atomic_t *v)
144	{	144	{
145	GEN_BINARY_RMWcc(LOCK_PREFIX "addl", v->counter, "er", i, "%0", "s");	145	GEN_BINARY_RMWcc(LOCK_PREFIX "addl", v->counter, "er", i, "%0", "s");
146	}	146	}
Line 147...	Line 147...
147		147
Line 150...	Line 150...
150	* @i: integer value to add	150	* @i: integer value to add
151	* @v: pointer of type atomic_t	151	* @v: pointer of type atomic_t
152	*	152	*
153	* Atomically adds @i to @v and returns @i + @v	153	* Atomically adds @i to @v and returns @i + @v
154	*/	154	*/
155	static inline int atomic_add_return(int i, atomic_t *v)	155	static __always_inline int atomic_add_return(int i, atomic_t *v)
156	{	156	{
157	return i + xadd(&v->counter, i);	157	return i + xadd(&v->counter, i);
158	}	158	}
Line 159...	Line 159...
159		159
Line 162...	Line 162...
162	* @v: pointer of type atomic_t	162	* @v: pointer of type atomic_t
163	* @i: integer value to subtract	163	* @i: integer value to subtract
164	*	164	*
165	* Atomically subtracts @i from @v and returns @v - @i	165	* Atomically subtracts @i from @v and returns @v - @i
166	*/	166	*/
167	static inline int atomic_sub_return(int i, atomic_t *v)	167	static __always_inline int atomic_sub_return(int i, atomic_t *v)
168	{	168	{
169	return atomic_add_return(-i, v);	169	return atomic_add_return(-i, v);
170	}	170	}
Line 171...	Line 171...
171		171
172	#define atomic_inc_return(v) (atomic_add_return(1, v))	172	#define atomic_inc_return(v) (atomic_add_return(1, v))
Line 173...	Line 173...
173	#define atomic_dec_return(v) (atomic_sub_return(1, v))	173	#define atomic_dec_return(v) (atomic_sub_return(1, v))
174		174
175	static inline int atomic_cmpxchg(atomic_t *v, int old, int new)	175	static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new)
176	{	176	{
Line 177...	Line 177...
177	return cmpxchg(&v->counter, old, new);	177	return cmpxchg(&v->counter, old, new);
178	}	178	}
179		179
180	static inline int atomic_xchg(atomic_t *v, int new)	180	static inline int atomic_xchg(atomic_t *v, int new)
Line -...	Line 181...
-		181	{
-		182	return xchg(&v->counter, new);
-		183	}
-		184
-		185	#define ATOMIC_OP(op) \
-		186	static inline void atomic_##op(int i, atomic_t *v) \
-		187	{ \
-		188	asm volatile(LOCK_PREFIX #op"l %1,%0" \
-		189	: "+m" (v->counter) \
-		190	: "ir" (i) \
-		191	: "memory"); \
-		192	}
-		193
-		194	ATOMIC_OP(and)
-		195	ATOMIC_OP(or)
181	{	196	ATOMIC_OP(xor)
182	return xchg(&v->counter, new);	197
183	}	198	#undef ATOMIC_OP
184		199
185	/**	200	/**
186	* __atomic_add_unless - add unless the number is already a given value	201	* __atomic_add_unless - add unless the number is already a given value
187	* @v: pointer of type atomic_t	202	* @v: pointer of type atomic_t
188	* @a: the amount to add to v...	203	* @a: the amount to add to v...
189	* @u: ...unless v is equal to u.	204	* @u: ...unless v is equal to u.
190	*	205	*
191	* Atomically adds @a to @v, so long as @v was not already @u.	206	* Atomically adds @a to @v, so long as @v was not already @u.
192	* Returns the old value of @v.	207	* Returns the old value of @v.
193	*/	208	*/
194	static inline int __atomic_add_unless(atomic_t *v, int a, int u)	209	static __always_inline int __atomic_add_unless(atomic_t *v, int a, int u)
195	{	210	{
Line 211...	Line 226...
211	* @v: pointer to type int	226	* @v: pointer to type int
212	*	227	*
213	* Atomically adds 1 to @v	228	* Atomically adds 1 to @v
214	* Returns the new value of @u	229	* Returns the new value of @u
215	*/	230	*/
216	static inline short int atomic_inc_short(short int *v)	231	static __always_inline short int atomic_inc_short(short int *v)
217	{	232	{
218	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));	233	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
219	return *v;	234	return *v;
220	}	235	}
Line 221...	Line -...
221		-
222	/* These are x86-specific, used by some header files */	-
223	#define atomic_clear_mask(mask, addr) \	-
224	asm volatile(LOCK_PREFIX "andl %0,%1" \	-
225	: : "r" (~(mask)), "m" (*(addr)) : "memory")	-
226		-
227	#define atomic_set_mask(mask, addr) \	-
228	asm volatile(LOCK_PREFIX "orl %0,%1" \	-
229	: : "r" ((unsigned)(mask)), "m" (*(addr)) \	-
230	: "memory")	-
231		236
232	#ifdef CONFIG_X86_32	237	#ifdef CONFIG_X86_32
233	# include	238	# include
234	#else	239	#else
235	# include	240	# include

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(root)/drivers/include/asm/atomic.h – Rev 5270 → 6082