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
|
#ifndef _INTERNAL_ATOMIC_H
#define _INTERNAL_ATOMIC_H
#include <stdint.h>
static inline int a_ctz_l(unsigned long x)
{
static const char debruijn32[32] = {
0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
};
return debruijn32[(x&-x)*0x076be629 >> 27];
}
static inline int a_ctz_64(uint64_t x)
{
uint32_t y = x;
if (!y) {
y = x>>32;
return 32 + a_ctz_l(y);
}
return a_ctz_l(y);
}
static inline int a_cas(volatile int *p, int t, int s)
{
register int old, tmp;
__asm__ __volatile__ (
" addi %0, r0, 0\n"
"1: lwx %0, %2, r0\n"
" rsubk %1, %0, %3\n"
" bnei %1, 1f\n"
" swx %4, %2, r0\n"
" addic %1, r0, 0\n"
" bnei %1, 1b\n"
"1: "
: "=&r"(old), "=&r"(tmp)
: "r"(p), "r"(t), "r"(s)
: "cc", "memory" );
return old;
}
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
return (void *)a_cas(p, (int)t, (int)s);
}
static inline long a_cas_l(volatile void *p, long t, long s)
{
return a_cas(p, t, s);
}
static inline int a_swap(volatile int *x, int v)
{
register int old, tmp;
__asm__ __volatile__ (
" addi %0, r0, 0\n"
"1: lwx %0, %2, r0\n"
" swx %3, %2, r0\n"
" addic %1, r0, 0\n"
" bnei %1, 1b\n"
"1: "
: "=&r"(old), "=&r"(tmp)
: "r"(x), "r"(v)
: "cc", "memory" );
return old;
}
static inline int a_fetch_add(volatile int *x, int v)
{
register int new, tmp;
__asm__ __volatile__ (
" addi %0, r0, 0\n"
"1: lwx %0, %2, r0\n"
" addk %0, %0, %3\n"
" swx %0, %2, r0\n"
" addic %1, r0, 0\n"
" bnei %1, 1b\n"
"1: "
: "=&r"(new), "=&r"(tmp)
: "r"(x), "r"(v)
: "cc", "memory" );
return new-v;
}
static inline void a_inc(volatile int *x)
{
a_fetch_add(x, 1);
}
static inline void a_dec(volatile int *x)
{
a_fetch_add(x, -1);
}
static inline void a_store(volatile int *p, int x)
{
__asm__ __volatile__ (
"swi %1, %0"
: "=m"(*p) : "r"(x) : "memory" );
}
static inline void a_spin()
{
}
static inline void a_crash()
{
*(volatile char *)0=0;
}
static inline void a_and(volatile int *p, int v)
{
int old;
do old = *p;
while (a_cas(p, old, old&v) != old);
}
static inline void a_or(volatile int *p, int v)
{
int old;
do old = *p;
while (a_cas(p, old, old|v) != old);
}
static inline void a_or_l(volatile void *p, long v)
{
a_or(p, v);
}
static inline void a_and_64(volatile uint64_t *p, uint64_t v)
{
union { uint64_t v; uint32_t r[2]; } u = { v };
a_and((int *)p, u.r[0]);
a_and((int *)p+1, u.r[1]);
}
static inline void a_or_64(volatile uint64_t *p, uint64_t v)
{
union { uint64_t v; uint32_t r[2]; } u = { v };
a_or((int *)p, u.r[0]);
a_or((int *)p+1, u.r[1]);
}
#endif
|
