Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/ck/include/gcc/ppc/ck_pr.h
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1 /* 2 * Copyright 2009-2015 Samy Al Bahra. 3 * Copyright 2012 João Fernandes. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef CK_PR_PPC_H 29 #define CK_PR_PPC_H 30 31 #ifndef CK_PR_H 32 #error Do not include this file directly, use ck_pr.h 33 #endif 34 35 #include <ck_cc.h> 36 #include <ck_md.h> 37 38 /* 39 * The following represent supported atomic operations. 40 * These operations may be emulated. 41 */ 42 #include "ck_f_pr.h" 43 44 /* 45 * Minimum interface requirement met. 46 */ 47 #define CK_F_PR 48 49 /* 50 * This bounces the hardware thread from low to medium 51 * priority. I am unsure of the benefits of this approach 52 * but it is used by the Linux kernel. 53 */ 54 CK_CC_INLINE static void 55 ck_pr_stall(void) 56 { 57 58 __asm__ __volatile__("or 1, 1, 1;" 59 "or 2, 2, 2;" ::: "memory"); 60 return; 61 } 62 63 #define CK_PR_FENCE(T, I) \ 64 CK_CC_INLINE static void \ 65 ck_pr_fence_strict_##T(void) \ 66 { \ 67 __asm__ __volatile__(I ::: "memory"); \ 68 } 69 70 #ifdef CK_MD_PPC32_LWSYNC 71 #define CK_PR_LWSYNCOP "lwsync" 72 #else /* CK_MD_PPC32_LWSYNC_DISABLE */ 73 #define CK_PR_LWSYNCOP "sync" 74 #endif 75 76 CK_PR_FENCE(atomic, CK_PR_LWSYNCOP) 77 CK_PR_FENCE(atomic_store, CK_PR_LWSYNCOP) 78 CK_PR_FENCE(atomic_load, "sync") 79 CK_PR_FENCE(store_atomic, CK_PR_LWSYNCOP) 80 CK_PR_FENCE(load_atomic, CK_PR_LWSYNCOP) 81 CK_PR_FENCE(store, CK_PR_LWSYNCOP) 82 CK_PR_FENCE(store_load, "sync") 83 CK_PR_FENCE(load, CK_PR_LWSYNCOP) 84 CK_PR_FENCE(load_store, CK_PR_LWSYNCOP) 85 CK_PR_FENCE(memory, "sync") 86 CK_PR_FENCE(acquire, CK_PR_LWSYNCOP) 87 CK_PR_FENCE(release, CK_PR_LWSYNCOP) 88 CK_PR_FENCE(acqrel, CK_PR_LWSYNCOP) 89 CK_PR_FENCE(lock, CK_PR_LWSYNCOP) 90 CK_PR_FENCE(unlock, CK_PR_LWSYNCOP) 91 92 #undef CK_PR_LWSYNCOP 93 94 #undef CK_PR_FENCE 95 96 #define CK_PR_LOAD(S, M, T, C, I) \ 97 CK_CC_INLINE static T \ 98 ck_pr_md_load_##S(const M *target) \ 99 { \ 100 T r; \ 101 __asm__ __volatile__(I "%U1%X1 %0, %1" \ 102 : "=r" (r) \ 103 : "m" (*(const C *)target) \ 104 : "memory"); \ 105 return (r); \ 106 } 107 108 CK_PR_LOAD(ptr, void, void *, uint32_t, "lwz") 109 110 #define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I) 111 112 CK_PR_LOAD_S(32, uint32_t, "lwz") 113 CK_PR_LOAD_S(16, uint16_t, "lhz") 114 CK_PR_LOAD_S(8, uint8_t, "lbz") 115 CK_PR_LOAD_S(uint, unsigned int, "lwz") 116 CK_PR_LOAD_S(int, int, "lwz") 117 CK_PR_LOAD_S(short, short, "lhz") 118 CK_PR_LOAD_S(char, char, "lbz") 119 120 #undef CK_PR_LOAD_S 121 #undef CK_PR_LOAD 122 123 #define CK_PR_STORE(S, M, T, C, I) \ 124 CK_CC_INLINE static void \ 125 ck_pr_md_store_##S(M *target, T v) \ 126 { \ 127 __asm__ __volatile__(I "%U0%X0 %1, %0" \ 128 : "=m" (*(C *)target) \ 129 : "r" (v) \ 130 : "memory"); \ 131 return; \ 132 } 133 134 CK_PR_STORE(ptr, void, const void *, uint32_t, "stw") 135 136 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I) 137 138 CK_PR_STORE_S(32, uint32_t, "stw") 139 CK_PR_STORE_S(16, uint16_t, "sth") 140 CK_PR_STORE_S(8, uint8_t, "stb") 141 CK_PR_STORE_S(uint, unsigned int, "stw") 142 CK_PR_STORE_S(int, int, "stw") 143 CK_PR_STORE_S(short, short, "sth") 144 CK_PR_STORE_S(char, char, "stb") 145 146 #undef CK_PR_STORE_S 147 #undef CK_PR_STORE 148 149 #define CK_PR_CAS(N, T, M) \ 150 CK_CC_INLINE static bool \ 151 ck_pr_cas_##N##_value(M *target, T compare, T set, M *value) \ 152 { \ 153 T previous; \ 154 __asm__ __volatile__("1:" \ 155 "lwarx %0, 0, %1;" \ 156 "cmpw 0, %0, %3;" \ 157 "bne- 2f;" \ 158 "stwcx. %2, 0, %1;" \ 159 "bne- 1b;" \ 160 "2:" \ 161 : "=&r" (previous) \ 162 : "r" (target), \ 163 "r" (set), \ 164 "r" (compare) \ 165 : "memory", "cc"); \ 166 *(T *)value = previous; \ 167 return (previous == compare); \ 168 } \ 169 CK_CC_INLINE static bool \ 170 ck_pr_cas_##N(M *target, T compare, T set) \ 171 { \ 172 T previous; \ 173 __asm__ __volatile__("1:" \ 174 "lwarx %0, 0, %1;" \ 175 "cmpw 0, %0, %3;" \ 176 "bne- 2f;" \ 177 "stwcx. %2, 0, %1;" \ 178 "bne- 1b;" \ 179 "2:" \ 180 : "=&r" (previous) \ 181 : "r" (target), \ 182 "r" (set), \ 183 "r" (compare) \ 184 : "memory", "cc"); \ 185 return (previous == compare); \ 186 } 187 188 CK_PR_CAS(ptr, void *, void) 189 #define CK_PR_CAS_S(a, b) CK_PR_CAS(a, b, b) 190 CK_PR_CAS_S(32, uint32_t) 191 CK_PR_CAS_S(uint, unsigned int) 192 CK_PR_CAS_S(int, int) 193 194 #undef CK_PR_CAS_S 195 #undef CK_PR_CAS 196 197 #define CK_PR_FAS(N, M, T, W) \ 198 CK_CC_INLINE static T \ 199 ck_pr_fas_##N(M *target, T v) \ 200 { \ 201 T previous; \ 202 __asm__ __volatile__("1:" \ 203 "l" W "arx %0, 0, %1;" \ 204 "st" W "cx. %2, 0, %1;" \ 205 "bne- 1b;" \ 206 : "=&r" (previous) \ 207 : "r" (target), \ 208 "r" (v) \ 209 : "memory", "cc"); \ 210 return (previous); \ 211 } 212 213 CK_PR_FAS(32, uint32_t, uint32_t, "w") 214 CK_PR_FAS(ptr, void, void *, "w") 215 CK_PR_FAS(int, int, int, "w") 216 CK_PR_FAS(uint, unsigned int, unsigned int, "w") 217 218 #undef CK_PR_FAS 219 220 #define CK_PR_UNARY(O, N, M, T, I, W) \ 221 CK_CC_INLINE static void \ 222 ck_pr_##O##_##N(M *target) \ 223 { \ 224 T previous; \ 225 __asm__ __volatile__("1:" \ 226 "l" W "arx %0, 0, %1;" \ 227 I ";" \ 228 "st" W "cx. %0, 0, %1;" \ 229 "bne- 1b;" \ 230 : "=&r" (previous) \ 231 : "r" (target) \ 232 : "memory", "cc"); \ 233 return; \ 234 } 235 236 CK_PR_UNARY(inc, ptr, void, void *, "addic %0, %0, 1", "w") 237 CK_PR_UNARY(dec, ptr, void, void *, "addic %0, %0, -1", "w") 238 CK_PR_UNARY(not, ptr, void, void *, "not %0, %0", "w") 239 CK_PR_UNARY(neg, ptr, void, void *, "neg %0, %0", "w") 240 241 #define CK_PR_UNARY_S(S, T, W) \ 242 CK_PR_UNARY(inc, S, T, T, "addic %0, %0, 1", W) \ 243 CK_PR_UNARY(dec, S, T, T, "addic %0, %0, -1", W) \ 244 CK_PR_UNARY(not, S, T, T, "not %0, %0", W) \ 245 CK_PR_UNARY(neg, S, T, T, "neg %0, %0", W) 246 247 CK_PR_UNARY_S(32, uint32_t, "w") 248 CK_PR_UNARY_S(uint, unsigned int, "w") 249 CK_PR_UNARY_S(int, int, "w") 250 251 #undef CK_PR_UNARY_S 252 #undef CK_PR_UNARY 253 254 #define CK_PR_BINARY(O, N, M, T, I, W) \ 255 CK_CC_INLINE static void \ 256 ck_pr_##O##_##N(M *target, T delta) \ 257 { \ 258 T previous; \ 259 __asm__ __volatile__("1:" \ 260 "l" W "arx %0, 0, %1;" \ 261 I " %0, %2, %0;" \ 262 "st" W "cx. %0, 0, %1;" \ 263 "bne- 1b;" \ 264 : "=&r" (previous) \ 265 : "r" (target), \ 266 "r" (delta) \ 267 : "memory", "cc"); \ 268 return; \ 269 } 270 271 CK_PR_BINARY(and, ptr, void, uintptr_t, "and", "w") 272 CK_PR_BINARY(add, ptr, void, uintptr_t, "add", "w") 273 CK_PR_BINARY(or, ptr, void, uintptr_t, "or", "w") 274 CK_PR_BINARY(sub, ptr, void, uintptr_t, "sub", "w") 275 CK_PR_BINARY(xor, ptr, void, uintptr_t, "xor", "w") 276 277 #define CK_PR_BINARY_S(S, T, W) \ 278 CK_PR_BINARY(and, S, T, T, "and", W) \ 279 CK_PR_BINARY(add, S, T, T, "add", W) \ 280 CK_PR_BINARY(or, S, T, T, "or", W) \ 281 CK_PR_BINARY(sub, S, T, T, "subf", W) \ 282 CK_PR_BINARY(xor, S, T, T, "xor", W) 283 284 CK_PR_BINARY_S(32, uint32_t, "w") 285 CK_PR_BINARY_S(uint, unsigned int, "w") 286 CK_PR_BINARY_S(int, int, "w") 287 288 #undef CK_PR_BINARY_S 289 #undef CK_PR_BINARY 290 291 CK_CC_INLINE static void * 292 ck_pr_faa_ptr(void *target, uintptr_t delta) 293 { 294 uintptr_t previous, r; 295 296 __asm__ __volatile__("1:" 297 "lwarx %0, 0, %2;" 298 "add %1, %3, %0;" 299 "stwcx. %1, 0, %2;" 300 "bne- 1b;" 301 : "=&r" (previous), 302 "=&r" (r) 303 : "r" (target), 304 "r" (delta) 305 : "memory", "cc"); 306 307 return (void *)(previous); 308 } 309 310 #define CK_PR_FAA(S, T, W) \ 311 CK_CC_INLINE static T \ 312 ck_pr_faa_##S(T *target, T delta) \ 313 { \ 314 T previous, r; \ 315 __asm__ __volatile__("1:" \ 316 "l" W "arx %0, 0, %2;" \ 317 "add %1, %3, %0;" \ 318 "st" W "cx. %1, 0, %2;" \ 319 "bne- 1b;" \ 320 : "=&r" (previous), \ 321 "=&r" (r) \ 322 : "r" (target), \ 323 "r" (delta) \ 324 : "memory", "cc"); \ 325 return (previous); \ 326 } 327 328 CK_PR_FAA(32, uint32_t, "w") 329 CK_PR_FAA(uint, unsigned int, "w") 330 CK_PR_FAA(int, int, "w") 331 332 #undef CK_PR_FAA 333 334 #endif /* CK_PR_PPC_H */ 335
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