1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_ATOMIC64_64_H 3 #define _ASM_X86_ATOMIC64_64_H 4 5 #include <linux/types.h> 6 #include <asm/alternative.h> 7 #include <asm/cmpxchg.h> 8 9 /* The 64-bit atomic type */ 10 11 #define ATOMIC64_INIT(i) { (i) } 12 13 /** 14 * arch_atomic64_read - read atomic64 variable 15 * @v: pointer of type atomic64_t 16 * 17 * Atomically reads the value of @v. 18 * Doesn't imply a read memory barrier. 19 */ 20 static inline s64 arch_atomic64_read(const atomic64_t *v) 21 { 22 return READ_ONCE((v)->counter); 23 } 24 25 /** 26 * arch_atomic64_set - set atomic64 variable 27 * @v: pointer to type atomic64_t 28 * @i: required value 29 * 30 * Atomically sets the value of @v to @i. 31 */ 32 static inline void arch_atomic64_set(atomic64_t *v, s64 i) 33 { 34 WRITE_ONCE(v->counter, i); 35 } 36 37 /** 38 * arch_atomic64_add - add integer to atomic64 variable 39 * @i: integer value to add 40 * @v: pointer to type atomic64_t 41 * 42 * Atomically adds @i to @v. 43 */ 44 static __always_inline void arch_atomic64_add(s64 i, atomic64_t *v) 45 { 46 asm volatile(LOCK_PREFIX "addq %1,%0" 47 : "=m" (v->counter) 48 : "er" (i), "m" (v->counter) : "memory"); 49 } 50 51 /** 52 * arch_atomic64_sub - subtract the atomic64 variable 53 * @i: integer value to subtract 54 * @v: pointer to type atomic64_t 55 * 56 * Atomically subtracts @i from @v. 57 */ 58 static inline void arch_atomic64_sub(s64 i, atomic64_t *v) 59 { 60 asm volatile(LOCK_PREFIX "subq %1,%0" 61 : "=m" (v->counter) 62 : "er" (i), "m" (v->counter) : "memory"); 63 } 64 65 /** 66 * arch_atomic64_sub_and_test - subtract value from variable and test result 67 * @i: integer value to subtract 68 * @v: pointer to type atomic64_t 69 * 70 * Atomically subtracts @i from @v and returns 71 * true if the result is zero, or false for all 72 * other cases. 73 */ 74 static inline bool arch_atomic64_sub_and_test(s64 i, atomic64_t *v) 75 { 76 return GEN_BINARY_RMWcc(LOCK_PREFIX "subq", v->counter, e, "er", i); 77 } 78 #define arch_atomic64_sub_and_test arch_atomic64_sub_and_test 79 80 /** 81 * arch_atomic64_inc - increment atomic64 variable 82 * @v: pointer to type atomic64_t 83 * 84 * Atomically increments @v by 1. 85 */ 86 static __always_inline void arch_atomic64_inc(atomic64_t *v) 87 { 88 asm volatile(LOCK_PREFIX "incq %0" 89 : "=m" (v->counter) 90 : "m" (v->counter) : "memory"); 91 } 92 #define arch_atomic64_inc arch_atomic64_inc 93 94 /** 95 * arch_atomic64_dec - decrement atomic64 variable 96 * @v: pointer to type atomic64_t 97 * 98 * Atomically decrements @v by 1. 99 */ 100 static __always_inline void arch_atomic64_dec(atomic64_t *v) 101 { 102 asm volatile(LOCK_PREFIX "decq %0" 103 : "=m" (v->counter) 104 : "m" (v->counter) : "memory"); 105 } 106 #define arch_atomic64_dec arch_atomic64_dec 107 108 /** 109 * arch_atomic64_dec_and_test - decrement and test 110 * @v: pointer to type atomic64_t 111 * 112 * Atomically decrements @v by 1 and 113 * returns true if the result is 0, or false for all other 114 * cases. 115 */ 116 static inline bool arch_atomic64_dec_and_test(atomic64_t *v) 117 { 118 return GEN_UNARY_RMWcc(LOCK_PREFIX "decq", v->counter, e); 119 } 120 #define arch_atomic64_dec_and_test arch_atomic64_dec_and_test 121 122 /** 123 * arch_atomic64_inc_and_test - increment and test 124 * @v: pointer to type atomic64_t 125 * 126 * Atomically increments @v by 1 127 * and returns true if the result is zero, or false for all 128 * other cases. 129 */ 130 static inline bool arch_atomic64_inc_and_test(atomic64_t *v) 131 { 132 return GEN_UNARY_RMWcc(LOCK_PREFIX "incq", v->counter, e); 133 } 134 #define arch_atomic64_inc_and_test arch_atomic64_inc_and_test 135 136 /** 137 * arch_atomic64_add_negative - add and test if negative 138 * @i: integer value to add 139 * @v: pointer to type atomic64_t 140 * 141 * Atomically adds @i to @v and returns true 142 * if the result is negative, or false when 143 * result is greater than or equal to zero. 144 */ 145 static inline bool arch_atomic64_add_negative(s64 i, atomic64_t *v) 146 { 147 return GEN_BINARY_RMWcc(LOCK_PREFIX "addq", v->counter, s, "er", i); 148 } 149 #define arch_atomic64_add_negative arch_atomic64_add_negative 150 151 /** 152 * arch_atomic64_add_return - add and return 153 * @i: integer value to add 154 * @v: pointer to type atomic64_t 155 * 156 * Atomically adds @i to @v and returns @i + @v 157 */ 158 static __always_inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v) 159 { 160 return i + xadd(&v->counter, i); 161 } 162 163 static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v) 164 { 165 return arch_atomic64_add_return(-i, v); 166 } 167 168 static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v) 169 { 170 return xadd(&v->counter, i); 171 } 172 173 static inline s64 arch_atomic64_fetch_sub(s64 i, atomic64_t *v) 174 { 175 return xadd(&v->counter, -i); 176 } 177 178 static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new) 179 { 180 return arch_cmpxchg(&v->counter, old, new); 181 } 182 183 #define arch_atomic64_try_cmpxchg arch_atomic64_try_cmpxchg 184 static __always_inline bool arch_atomic64_try_cmpxchg(atomic64_t *v, s64 *old, s64 new) 185 { 186 return try_cmpxchg(&v->counter, old, new); 187 } 188 189 static inline s64 arch_atomic64_xchg(atomic64_t *v, s64 new) 190 { 191 return arch_xchg(&v->counter, new); 192 } 193 194 static inline void arch_atomic64_and(s64 i, atomic64_t *v) 195 { 196 asm volatile(LOCK_PREFIX "andq %1,%0" 197 : "+m" (v->counter) 198 : "er" (i) 199 : "memory"); 200 } 201 202 static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v) 203 { 204 s64 val = arch_atomic64_read(v); 205 206 do { 207 } while (!arch_atomic64_try_cmpxchg(v, &val, val & i)); 208 return val; 209 } 210 211 static inline void arch_atomic64_or(s64 i, atomic64_t *v) 212 { 213 asm volatile(LOCK_PREFIX "orq %1,%0" 214 : "+m" (v->counter) 215 : "er" (i) 216 : "memory"); 217 } 218 219 static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v) 220 { 221 s64 val = arch_atomic64_read(v); 222 223 do { 224 } while (!arch_atomic64_try_cmpxchg(v, &val, val | i)); 225 return val; 226 } 227 228 static inline void arch_atomic64_xor(s64 i, atomic64_t *v) 229 { 230 asm volatile(LOCK_PREFIX "xorq %1,%0" 231 : "+m" (v->counter) 232 : "er" (i) 233 : "memory"); 234 } 235 236 static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v) 237 { 238 s64 val = arch_atomic64_read(v); 239 240 do { 241 } while (!arch_atomic64_try_cmpxchg(v, &val, val ^ i)); 242 return val; 243 } 244 245 #endif /* _ASM_X86_ATOMIC64_64_H */ 246