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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 | #ifndef _ASM_POWERPC_CMPXCHG_H_ #define _ASM_POWERPC_CMPXCHG_H_ #ifdef __KERNEL__ #include <linux/compiler.h> #include <asm/synch.h> #include <asm/asm-compat.h> /* * Atomic exchange * * Changes the memory location '*ptr' to be val and returns * the previous value stored there. */ static __always_inline unsigned long __xchg_u32(volatile void *p, unsigned long val) { unsigned long prev; __asm__ __volatile__( PPC_RELEASE_BARRIER "1: lwarx %0,0,%2 \n" PPC405_ERR77(0,%2) " stwcx. %3,0,%2 \n\ bne- 1b" PPC_ACQUIRE_BARRIER : "=&r" (prev), "+m" (*(volatile unsigned int *)p) : "r" (p), "r" (val) : "cc", "memory"); return prev; } /* * Atomic exchange * * Changes the memory location '*ptr' to be val and returns * the previous value stored there. */ static __always_inline unsigned long __xchg_u32_local(volatile void *p, unsigned long val) { unsigned long prev; __asm__ __volatile__( "1: lwarx %0,0,%2 \n" PPC405_ERR77(0,%2) " stwcx. %3,0,%2 \n\ bne- 1b" : "=&r" (prev), "+m" (*(volatile unsigned int *)p) : "r" (p), "r" (val) : "cc", "memory"); return prev; } #ifdef CONFIG_PPC64 static __always_inline unsigned long __xchg_u64(volatile void *p, unsigned long val) { unsigned long prev; __asm__ __volatile__( PPC_RELEASE_BARRIER "1: ldarx %0,0,%2 \n" PPC405_ERR77(0,%2) " stdcx. %3,0,%2 \n\ bne- 1b" PPC_ACQUIRE_BARRIER : "=&r" (prev), "+m" (*(volatile unsigned long *)p) : "r" (p), "r" (val) : "cc", "memory"); return prev; } static __always_inline unsigned long __xchg_u64_local(volatile void *p, unsigned long val) { unsigned long prev; __asm__ __volatile__( "1: ldarx %0,0,%2 \n" PPC405_ERR77(0,%2) " stdcx. %3,0,%2 \n\ bne- 1b" : "=&r" (prev), "+m" (*(volatile unsigned long *)p) : "r" (p), "r" (val) : "cc", "memory"); return prev; } #endif /* * This function doesn't exist, so you'll get a linker error * if something tries to do an invalid xchg(). */ extern void __xchg_called_with_bad_pointer(void); static __always_inline unsigned long __xchg(volatile void *ptr, unsigned long x, unsigned int size) { switch (size) { case 4: return __xchg_u32(ptr, x); #ifdef CONFIG_PPC64 case 8: return __xchg_u64(ptr, x); #endif } __xchg_called_with_bad_pointer(); return x; } static __always_inline unsigned long __xchg_local(volatile void *ptr, unsigned long x, unsigned int size) { switch (size) { case 4: return __xchg_u32_local(ptr, x); #ifdef CONFIG_PPC64 case 8: return __xchg_u64_local(ptr, x); #endif } __xchg_called_with_bad_pointer(); return x; } #define xchg(ptr,x) \ ({ \ __typeof__(*(ptr)) _x_ = (x); \ (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \ }) #define xchg_local(ptr,x) \ ({ \ __typeof__(*(ptr)) _x_ = (x); \ (__typeof__(*(ptr))) __xchg_local((ptr), \ (unsigned long)_x_, sizeof(*(ptr))); \ }) /* * Compare and exchange - if *p == old, set it to new, * and return the old value of *p. */ #define __HAVE_ARCH_CMPXCHG 1 static __always_inline unsigned long __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new) { unsigned int prev; __asm__ __volatile__ ( PPC_RELEASE_BARRIER "1: lwarx %0,0,%2 # __cmpxchg_u32\n\ cmpw 0,%0,%3\n\ bne- 2f\n" PPC405_ERR77(0,%2) " stwcx. %4,0,%2\n\ bne- 1b" PPC_ACQUIRE_BARRIER "\n\ 2:" : "=&r" (prev), "+m" (*p) : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; } static __always_inline unsigned long __cmpxchg_u32_local(volatile unsigned int *p, unsigned long old, unsigned long new) { unsigned int prev; __asm__ __volatile__ ( "1: lwarx %0,0,%2 # __cmpxchg_u32\n\ cmpw 0,%0,%3\n\ bne- 2f\n" PPC405_ERR77(0,%2) " stwcx. %4,0,%2\n\ bne- 1b" "\n\ 2:" : "=&r" (prev), "+m" (*p) : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; } #ifdef CONFIG_PPC64 static __always_inline unsigned long __cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) { unsigned long prev; __asm__ __volatile__ ( PPC_RELEASE_BARRIER "1: ldarx %0,0,%2 # __cmpxchg_u64\n\ cmpd 0,%0,%3\n\ bne- 2f\n\ stdcx. %4,0,%2\n\ bne- 1b" PPC_ACQUIRE_BARRIER "\n\ 2:" : "=&r" (prev), "+m" (*p) : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; } static __always_inline unsigned long __cmpxchg_u64_local(volatile unsigned long *p, unsigned long old, unsigned long new) { unsigned long prev; __asm__ __volatile__ ( "1: ldarx %0,0,%2 # __cmpxchg_u64\n\ cmpd 0,%0,%3\n\ bne- 2f\n\ stdcx. %4,0,%2\n\ bne- 1b" "\n\ 2:" : "=&r" (prev), "+m" (*p) : "r" (p), "r" (old), "r" (new) : "cc", "memory"); return prev; } #endif /* This function doesn't exist, so you'll get a linker error if something tries to do an invalid cmpxchg(). */ extern void __cmpxchg_called_with_bad_pointer(void); static __always_inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, unsigned int size) { switch (size) { case 4: return __cmpxchg_u32(ptr, old, new); #ifdef CONFIG_PPC64 case 8: return __cmpxchg_u64(ptr, old, new); #endif } __cmpxchg_called_with_bad_pointer(); return old; } static __always_inline unsigned long __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new, unsigned int size) { switch (size) { case 4: return __cmpxchg_u32_local(ptr, old, new); #ifdef CONFIG_PPC64 case 8: return __cmpxchg_u64_local(ptr, old, new); #endif } __cmpxchg_called_with_bad_pointer(); return old; } #define cmpxchg(ptr, o, n) \ ({ \ __typeof__(*(ptr)) _o_ = (o); \ __typeof__(*(ptr)) _n_ = (n); \ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ (unsigned long)_n_, sizeof(*(ptr))); \ }) #define cmpxchg_local(ptr, o, n) \ ({ \ __typeof__(*(ptr)) _o_ = (o); \ __typeof__(*(ptr)) _n_ = (n); \ (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ (unsigned long)_n_, sizeof(*(ptr))); \ }) #ifdef CONFIG_PPC64 #define cmpxchg64(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ cmpxchg((ptr), (o), (n)); \ }) #define cmpxchg64_local(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ cmpxchg_local((ptr), (o), (n)); \ }) #else #include <asm-generic/cmpxchg-local.h> #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_CMPXCHG_H_ */ |