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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 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_CSKY_CMPXCHG_H #define __ASM_CSKY_CMPXCHG_H #ifdef CONFIG_SMP #include <linux/bug.h> #include <asm/barrier.h> #define __xchg_relaxed(new, ptr, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__(*(ptr)) __ret; \ unsigned long tmp; \ switch (size) { \ case 2: { \ u32 ret; \ u32 shif = ((ulong)__ptr & 2) ? 16 : 0; \ u32 mask = 0xffff << shif; \ __ptr = (__typeof__(ptr))((ulong)__ptr & ~2); \ __asm__ __volatile__ ( \ "1: ldex.w %0, (%4)\n" \ " and %1, %0, %2\n" \ " or %1, %1, %3\n" \ " stex.w %1, (%4)\n" \ " bez %1, 1b\n" \ : "=&r" (ret), "=&r" (tmp) \ : "r" (~mask), \ "r" ((u32)__new << shif), \ "r" (__ptr) \ : "memory"); \ __ret = (__typeof__(*(ptr))) \ ((ret & mask) >> shif); \ break; \ } \ case 4: \ asm volatile ( \ "1: ldex.w %0, (%3) \n" \ " mov %1, %2 \n" \ " stex.w %1, (%3) \n" \ " bez %1, 1b \n" \ : "=&r" (__ret), "=&r" (tmp) \ : "r" (__new), "r"(__ptr) \ :); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define arch_xchg_relaxed(ptr, x) \ (__xchg_relaxed((x), (ptr), sizeof(*(ptr)))) #define __cmpxchg_relaxed(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__(new) __tmp; \ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ case 4: \ asm volatile ( \ "1: ldex.w %0, (%3) \n" \ " cmpne %0, %4 \n" \ " bt 2f \n" \ " mov %1, %2 \n" \ " stex.w %1, (%3) \n" \ " bez %1, 1b \n" \ "2: \n" \ : "=&r" (__ret), "=&r" (__tmp) \ : "r" (__new), "r"(__ptr), "r"(__old) \ :); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define arch_cmpxchg_relaxed(ptr, o, n) \ (__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr)))) #define __cmpxchg_acquire(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__(new) __tmp; \ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ case 4: \ asm volatile ( \ "1: ldex.w %0, (%3) \n" \ " cmpne %0, %4 \n" \ " bt 2f \n" \ " mov %1, %2 \n" \ " stex.w %1, (%3) \n" \ " bez %1, 1b \n" \ ACQUIRE_FENCE \ "2: \n" \ : "=&r" (__ret), "=&r" (__tmp) \ : "r" (__new), "r"(__ptr), "r"(__old) \ :); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define arch_cmpxchg_acquire(ptr, o, n) \ (__cmpxchg_acquire((ptr), (o), (n), sizeof(*(ptr)))) #define __cmpxchg(ptr, old, new, size) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(new) __new = (new); \ __typeof__(new) __tmp; \ __typeof__(old) __old = (old); \ __typeof__(*(ptr)) __ret; \ switch (size) { \ case 4: \ asm volatile ( \ RELEASE_FENCE \ "1: ldex.w %0, (%3) \n" \ " cmpne %0, %4 \n" \ " bt 2f \n" \ " mov %1, %2 \n" \ " stex.w %1, (%3) \n" \ " bez %1, 1b \n" \ FULL_FENCE \ "2: \n" \ : "=&r" (__ret), "=&r" (__tmp) \ : "r" (__new), "r"(__ptr), "r"(__old) \ :); \ break; \ default: \ BUILD_BUG(); \ } \ __ret; \ }) #define arch_cmpxchg(ptr, o, n) \ (__cmpxchg((ptr), (o), (n), sizeof(*(ptr)))) #define arch_cmpxchg_local(ptr, o, n) \ (__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr)))) #else #include <asm-generic/cmpxchg.h> #endif #endif /* __ASM_CSKY_CMPXCHG_H */ |