1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
#ifndef __ARCH_S390_ATOMIC__
#define __ARCH_S390_ATOMIC__
/*
* include/asm-s390/atomic.h
*
* S390 version
* Copyright (C) 1999-2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Denis Joseph Barrow,
* Arnd Bergmann (arndb@de.ibm.com)
*
* Derived from "include/asm-i386/bitops.h"
* Copyright (C) 1992, Linus Torvalds
*
*/
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
* S390 uses 'Compare And Swap' for atomicity in SMP enviroment
*/
typedef struct {
volatile int counter;
} __attribute__ ((aligned (4))) atomic_t;
#define ATOMIC_INIT(i) { (i) }
#ifdef __KERNEL__
#define __CS_LOOP(ptr, op_val, op_string) ({ \
typeof(ptr->counter) old_val, new_val; \
__asm__ __volatile__(" l %0,0(%3)\n" \
"0: lr %1,%0\n" \
op_string " %1,%4\n" \
" cs %0,%1,0(%3)\n" \
" jl 0b" \
: "=&d" (old_val), "=&d" (new_val), \
"=m" (((atomic_t *)(ptr))->counter) \
: "a" (ptr), "d" (op_val), \
"m" (((atomic_t *)(ptr))->counter) \
: "cc", "memory" ); \
new_val; \
})
#define atomic_read(v) ((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
static __inline__ void atomic_add(int i, atomic_t * v)
{
__CS_LOOP(v, i, "ar");
}
static __inline__ int atomic_add_return(int i, atomic_t * v)
{
return __CS_LOOP(v, i, "ar");
}
static __inline__ int atomic_add_negative(int i, atomic_t * v)
{
return __CS_LOOP(v, i, "ar") < 0;
}
static __inline__ void atomic_sub(int i, atomic_t * v)
{
__CS_LOOP(v, i, "sr");
}
static __inline__ int atomic_sub_return(int i, atomic_t * v)
{
return __CS_LOOP(v, i, "sr");
}
static __inline__ void atomic_inc(volatile atomic_t * v)
{
__CS_LOOP(v, 1, "ar");
}
static __inline__ int atomic_inc_return(volatile atomic_t * v)
{
return __CS_LOOP(v, 1, "ar");
}
static __inline__ int atomic_inc_and_test(volatile atomic_t * v)
{
return __CS_LOOP(v, 1, "ar") == 0;
}
static __inline__ void atomic_dec(volatile atomic_t * v)
{
__CS_LOOP(v, 1, "sr");
}
static __inline__ int atomic_dec_return(volatile atomic_t * v)
{
return __CS_LOOP(v, 1, "sr");
}
static __inline__ int atomic_dec_and_test(volatile atomic_t * v)
{
return __CS_LOOP(v, 1, "sr") == 0;
}
static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t * v)
{
__CS_LOOP(v, ~mask, "nr");
}
static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v)
{
__CS_LOOP(v, mask, "or");
}
#undef __CS_LOOP
#ifdef __s390x__
typedef struct {
volatile long long counter;
} __attribute__ ((aligned (8))) atomic64_t;
#define ATOMIC64_INIT(i) { (i) }
#define __CSG_LOOP(ptr, op_val, op_string) ({ \
typeof(ptr->counter) old_val, new_val; \
__asm__ __volatile__(" lg %0,0(%3)\n" \
"0: lgr %1,%0\n" \
op_string " %1,%4\n" \
" csg %0,%1,0(%3)\n" \
" jl 0b" \
: "=&d" (old_val), "=&d" (new_val), \
"=m" (((atomic_t *)(ptr))->counter) \
: "a" (ptr), "d" (op_val), \
"m" (((atomic_t *)(ptr))->counter) \
: "cc", "memory" ); \
new_val; \
})
#define atomic64_read(v) ((v)->counter)
#define atomic64_set(v,i) (((v)->counter) = (i))
static __inline__ void atomic64_add(int i, atomic64_t * v)
{
__CSG_LOOP(v, i, "agr");
}
static __inline__ long long atomic64_add_return(int i, atomic64_t * v)
{
return __CSG_LOOP(v, i, "agr");
}
static __inline__ long long atomic64_add_negative(int i, atomic64_t * v)
{
return __CSG_LOOP(v, i, "agr") < 0;
}
static __inline__ void atomic64_sub(int i, atomic64_t * v)
{
__CSG_LOOP(v, i, "sgr");
}
static __inline__ void atomic64_inc(volatile atomic64_t * v)
{
__CSG_LOOP(v, 1, "agr");
}
static __inline__ long long atomic64_inc_return(volatile atomic64_t * v)
{
return __CSG_LOOP(v, 1, "agr");
}
static __inline__ long long atomic64_inc_and_test(volatile atomic64_t * v)
{
return __CSG_LOOP(v, 1, "agr") == 0;
}
static __inline__ void atomic64_dec(volatile atomic64_t * v)
{
__CSG_LOOP(v, 1, "sgr");
}
static __inline__ long long atomic64_dec_return(volatile atomic64_t * v)
{
return __CSG_LOOP(v, 1, "sgr");
}
static __inline__ long long atomic64_dec_and_test(volatile atomic64_t * v)
{
return __CSG_LOOP(v, 1, "sgr") == 0;
}
static __inline__ void atomic64_clear_mask(unsigned long mask, atomic64_t * v)
{
__CSG_LOOP(v, ~mask, "ngr");
}
static __inline__ void atomic64_set_mask(unsigned long mask, atomic64_t * v)
{
__CSG_LOOP(v, mask, "ogr");
}
#undef __CSG_LOOP
#endif
/*
returns 0 if expected_oldval==value in *v ( swap was successful )
returns 1 if unsuccessful.
This is non-portable, use bitops or spinlocks instead!
*/
static __inline__ int
atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v)
{
int retval;
__asm__ __volatile__(
" lr %0,%3\n"
" cs %0,%4,0(%2)\n"
" ipm %0\n"
" srl %0,28\n"
"0:"
: "=&d" (retval), "=m" (v->counter)
: "a" (v), "d" (expected_oldval) , "d" (new_val),
"m" (v->counter) : "cc", "memory" );
return retval;
}
#define smp_mb__before_atomic_dec() smp_mb()
#define smp_mb__after_atomic_dec() smp_mb()
#define smp_mb__before_atomic_inc() smp_mb()
#define smp_mb__after_atomic_inc() smp_mb()
#endif /* __KERNEL__ */
#endif /* __ARCH_S390_ATOMIC__ */
|
