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| 1 #ifndef _INTERNAL_ATOMIC_H | |
| 2 #define _INTERNAL_ATOMIC_H | |
| 3 | |
| 4 #include <stdint.h> | |
| 5 | |
| 6 static inline int a_ctz_l(unsigned long x) | |
| 7 { | |
| 8 static const char debruijn32[32] = { | |
| 9 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13, | |
| 10 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14 | |
| 11 }; | |
| 12 return debruijn32[(x&-x)*0x076be629 >> 27]; | |
| 13 } | |
| 14 | |
| 15 static inline int a_ctz_64(uint64_t x) | |
| 16 { | |
| 17 uint32_t y = x; | |
| 18 if (!y) { | |
| 19 y = x>>32; | |
| 20 return 32 + a_ctz_l(y); | |
| 21 } | |
| 22 return a_ctz_l(y); | |
| 23 } | |
| 24 | |
| 25 static inline int a_cas(volatile int *p, int t, int s) | |
| 26 { | |
| 27 register int old, tmp; | |
| 28 __asm__ __volatile__ ( | |
| 29 " addi %0, r0, 0\n" | |
| 30 "1: lwx %0, %2, r0\n" | |
| 31 " rsubk %1, %0, %3\n" | |
| 32 " bnei %1, 1f\n" | |
| 33 " swx %4, %2, r0\n" | |
| 34 " addic %1, r0, 0\n" | |
| 35 " bnei %1, 1b\n" | |
| 36 "1: " | |
| 37 : "=&r"(old), "=&r"(tmp) | |
| 38 : "r"(p), "r"(t), "r"(s) | |
| 39 : "cc", "memory" ); | |
| 40 return old; | |
| 41 } | |
| 42 | |
| 43 static inline void *a_cas_p(volatile void *p, void *t, void *s) | |
| 44 { | |
| 45 return (void *)a_cas(p, (int)t, (int)s); | |
| 46 } | |
| 47 | |
| 48 static inline int a_swap(volatile int *x, int v) | |
| 49 { | |
| 50 register int old, tmp; | |
| 51 __asm__ __volatile__ ( | |
| 52 " addi %0, r0, 0\n" | |
| 53 "1: lwx %0, %2, r0\n" | |
| 54 " swx %3, %2, r0\n" | |
| 55 " addic %1, r0, 0\n" | |
| 56 " bnei %1, 1b\n" | |
| 57 "1: " | |
| 58 : "=&r"(old), "=&r"(tmp) | |
| 59 : "r"(x), "r"(v) | |
| 60 : "cc", "memory" ); | |
| 61 return old; | |
| 62 } | |
| 63 | |
| 64 static inline int a_fetch_add(volatile int *x, int v) | |
| 65 { | |
| 66 register int new, tmp; | |
| 67 __asm__ __volatile__ ( | |
| 68 " addi %0, r0, 0\n" | |
| 69 "1: lwx %0, %2, r0\n" | |
| 70 " addk %0, %0, %3\n" | |
| 71 " swx %0, %2, r0\n" | |
| 72 " addic %1, r0, 0\n" | |
| 73 " bnei %1, 1b\n" | |
| 74 "1: " | |
| 75 : "=&r"(new), "=&r"(tmp) | |
| 76 : "r"(x), "r"(v) | |
| 77 : "cc", "memory" ); | |
| 78 return new-v; | |
| 79 } | |
| 80 | |
| 81 static inline void a_inc(volatile int *x) | |
| 82 { | |
| 83 a_fetch_add(x, 1); | |
| 84 } | |
| 85 | |
| 86 static inline void a_dec(volatile int *x) | |
| 87 { | |
| 88 a_fetch_add(x, -1); | |
| 89 } | |
| 90 | |
| 91 static inline void a_store(volatile int *p, int x) | |
| 92 { | |
| 93 __asm__ __volatile__ ( | |
| 94 "swi %1, %0" | |
| 95 : "=m"(*p) : "r"(x) : "memory" ); | |
| 96 } | |
| 97 | |
| 98 #define a_spin a_barrier | |
| 99 | |
| 100 static inline void a_barrier() | |
| 101 { | |
| 102 a_cas(&(int){0}, 0, 0); | |
| 103 } | |
| 104 | |
| 105 static inline void a_crash() | |
| 106 { | |
| 107 *(volatile char *)0=0; | |
| 108 } | |
| 109 | |
| 110 static inline void a_and(volatile int *p, int v) | |
| 111 { | |
| 112 int old; | |
| 113 do old = *p; | |
| 114 while (a_cas(p, old, old&v) != old); | |
| 115 } | |
| 116 | |
| 117 static inline void a_or(volatile int *p, int v) | |
| 118 { | |
| 119 int old; | |
| 120 do old = *p; | |
| 121 while (a_cas(p, old, old|v) != old); | |
| 122 } | |
| 123 | |
| 124 static inline void a_or_l(volatile void *p, long v) | |
| 125 { | |
| 126 a_or(p, v); | |
| 127 } | |
| 128 | |
| 129 static inline void a_and_64(volatile uint64_t *p, uint64_t v) | |
| 130 { | |
| 131 union { uint64_t v; uint32_t r[2]; } u = { v }; | |
| 132 a_and((int *)p, u.r[0]); | |
| 133 a_and((int *)p+1, u.r[1]); | |
| 134 } | |
| 135 | |
| 136 static inline void a_or_64(volatile uint64_t *p, uint64_t v) | |
| 137 { | |
| 138 union { uint64_t v; uint32_t r[2]; } u = { v }; | |
| 139 a_or((int *)p, u.r[0]); | |
| 140 a_or((int *)p+1, u.r[1]); | |
| 141 } | |
| 142 | |
| 143 #endif | |
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Chromium Code Reviews
Issue 1574103002:
Remove cruft from fusl (Closed)
Base URL: https://github.com/domokit/mojo.git@master