Warning: That file was not part of the compilation database. It may have many parsing errors.
| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| 4 | */ |
| 5 | |
| 6 | #ifndef __ASM_ARC_CMPXCHG_H |
| 7 | #define __ASM_ARC_CMPXCHG_H |
| 8 | |
| 9 | #include <linux/build_bug.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/cmpxchg-emu.h> |
| 12 | |
| 13 | #include <asm/barrier.h> |
| 14 | #include <asm/smp.h> |
| 15 | |
| 16 | #ifdef CONFIG_ARC_HAS_LLSC |
| 17 | |
| 18 | /* |
| 19 | * if (*ptr == @old) |
| 20 | * *ptr = @new |
| 21 | */ |
| 22 | #define __cmpxchg(ptr, old, new) \ |
| 23 | ({ \ |
| 24 | __typeof__(*(ptr)) _prev; \ |
| 25 | \ |
| 26 | __asm__ __volatile__( \ |
| 27 | "1: llock %0, [%1] \n" \ |
| 28 | " brne %0, %2, 2f \n" \ |
| 29 | " scond %3, [%1] \n" \ |
| 30 | " bnz 1b \n" \ |
| 31 | "2: \n" \ |
| 32 | : "=&r"(_prev) /* Early clobber prevent reg reuse */ \ |
| 33 | : "r"(ptr), /* Not "m": llock only supports reg */ \ |
| 34 | "ir"(old), \ |
| 35 | "r"(new) /* Not "ir": scond can't take LIMM */ \ |
| 36 | : "cc", \ |
| 37 | "memory"); /* gcc knows memory is clobbered */ \ |
| 38 | \ |
| 39 | _prev; \ |
| 40 | }) |
| 41 | |
| 42 | #define arch_cmpxchg_relaxed(ptr, old, new) \ |
| 43 | ({ \ |
| 44 | __typeof__(ptr) _p_ = (ptr); \ |
| 45 | __typeof__(*(ptr)) _o_ = (old); \ |
| 46 | __typeof__(*(ptr)) _n_ = (new); \ |
| 47 | __typeof__(*(ptr)) _prev_; \ |
| 48 | \ |
| 49 | switch(sizeof((_p_))) { \ |
| 50 | case 1: \ |
| 51 | _prev_ = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *__force)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \ |
| 52 | break; \ |
| 53 | case 4: \ |
| 54 | _prev_ = __cmpxchg(_p_, _o_, _n_); \ |
| 55 | break; \ |
| 56 | default: \ |
| 57 | BUILD_BUG(); \ |
| 58 | } \ |
| 59 | _prev_; \ |
| 60 | }) |
| 61 | |
| 62 | #else |
| 63 | |
| 64 | #define arch_cmpxchg(ptr, old, new) \ |
| 65 | ({ \ |
| 66 | volatile __typeof__(ptr) _p_ = (ptr); \ |
| 67 | __typeof__(*(ptr)) _o_ = (old); \ |
| 68 | __typeof__(*(ptr)) _n_ = (new); \ |
| 69 | __typeof__(*(ptr)) _prev_; \ |
| 70 | unsigned long __flags; \ |
| 71 | \ |
| 72 | /* \ |
| 73 | * spin lock/unlock provide the needed smp_mb() before/after \ |
| 74 | */ \ |
| 75 | atomic_ops_lock(__flags); \ |
| 76 | _prev_ = *_p_; \ |
| 77 | if (_prev_ == _o_) \ |
| 78 | *_p_ = _n_; \ |
| 79 | atomic_ops_unlock(__flags); \ |
| 80 | _prev_; \ |
| 81 | }) |
| 82 | |
| 83 | #endif |
| 84 | |
| 85 | /* |
| 86 | * xchg |
| 87 | */ |
| 88 | #ifdef CONFIG_ARC_HAS_LLSC |
| 89 | |
| 90 | #define __arch_xchg(ptr, val) \ |
| 91 | ({ \ |
| 92 | __asm__ __volatile__( \ |
| 93 | " ex %0, [%1] \n" /* set new value */ \ |
| 94 | : "+r"(val) \ |
| 95 | : "r"(ptr) \ |
| 96 | : "memory"); \ |
| 97 | _val_; /* get old value */ \ |
| 98 | }) |
| 99 | |
| 100 | #define arch_xchg_relaxed(ptr, val) \ |
| 101 | ({ \ |
| 102 | __typeof__(ptr) _p_ = (ptr); \ |
| 103 | __typeof__(*(ptr)) _val_ = (val); \ |
| 104 | \ |
| 105 | switch(sizeof(*(_p_))) { \ |
| 106 | case 4: \ |
| 107 | _val_ = __arch_xchg(_p_, _val_); \ |
| 108 | break; \ |
| 109 | default: \ |
| 110 | BUILD_BUG(); \ |
| 111 | } \ |
| 112 | _val_; \ |
| 113 | }) |
| 114 | |
| 115 | #else /* !CONFIG_ARC_HAS_LLSC */ |
| 116 | |
| 117 | /* |
| 118 | * EX instructions is baseline and present in !LLSC too. But in this |
| 119 | * regime it still needs use @atomic_ops_lock spinlock to allow interop |
| 120 | * with cmpxchg() which uses spinlock in !LLSC |
| 121 | * (llist.h use xchg and cmpxchg on sama data) |
| 122 | */ |
| 123 | |
| 124 | #define arch_xchg(ptr, val) \ |
| 125 | ({ \ |
| 126 | __typeof__(ptr) _p_ = (ptr); \ |
| 127 | __typeof__(*(ptr)) _val_ = (val); \ |
| 128 | \ |
| 129 | unsigned long __flags; \ |
| 130 | \ |
| 131 | atomic_ops_lock(__flags); \ |
| 132 | \ |
| 133 | __asm__ __volatile__( \ |
| 134 | " ex %0, [%1] \n" \ |
| 135 | : "+r"(_val_) \ |
| 136 | : "r"(_p_) \ |
| 137 | : "memory"); \ |
| 138 | \ |
| 139 | atomic_ops_unlock(__flags); \ |
| 140 | _val_; \ |
| 141 | }) |
| 142 | |
| 143 | #endif |
| 144 | |
| 145 | #endif |
| 146 |
Warning: That file was not part of the compilation database. It may have many parsing errors.