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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 | #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)
{
int dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%2)\n"
" bne %0, %3, 1f\n"
" addu %1, %4, $0\n"
" sc %1, 0(%2)\n"
" beq %1, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(t), "=&r"(dummy) : "r"(p), "r"(t), "r"(s) : "memory" );
return t;
}
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)
{
int old, dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%2)\n"
" addu %1, %3, $0\n"
" sc %1, 0(%2)\n"
" beq %1, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
return old;
}
static inline int a_fetch_add(volatile int *x, int v)
{
int old, dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%2)\n"
" addu %1, %0, %3\n"
" sc %1, 0(%2)\n"
" beq %1, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
return old;
}
static inline void a_inc(volatile int *x)
{
int dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" addu %0, %0, 1\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(dummy) : "r"(x) : "memory" );
}
static inline void a_dec(volatile int *x)
{
int dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" subu %0, %0, 1\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(dummy) : "r"(x) : "memory" );
}
static inline void a_store(volatile int *p, int x)
{
int dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" addu %0, %2, $0\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(dummy) : "r"(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 dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" and %0, %0, %2\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
}
static inline void a_or(volatile int *p, int v)
{
int dummy;
__asm__ __volatile__(
".set push\n"
".set mips2\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" or %0, %0, %2\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
}
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
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