| 1 | |
| 2 | * Copyright (C) 2014 Stefan Kristiansson <[email protected]>
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| 3 | *
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| 4 | * This file is licensed under the terms of the GNU General Public License
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| 5 | * version 2. This program is licensed "as is" without any warranty of any
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| 6 | * kind, whether express or implied.
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| 7 |
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| 8 |
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| 9 | #ifndef __ASM_OPENRISC_ATOMIC_H
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| 10 | #define __ASM_OPENRISC_ATOMIC_H
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| 11 |
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| 12 | #include <linux/types.h>
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| 13 |
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| 14 |
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| 15 | #define ATOMIC_OP(op) \
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| 16 | static inline void arch_atomic_##op(int i, atomic_t *v) \
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| 17 | { \
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| 18 | int tmp; \
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| 19 | \
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| 20 | __asm__ __volatile__( \
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| 21 | "1: l.lwa %0,0(%1) \n" \
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| 22 | " l." #op " %0,%0,%2 \n" \
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| 23 | " l.swa 0(%1),%0 \n" \
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| 24 | " l.bnf 1b \n" \
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| 25 | " l.nop \n" \
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| 26 | : "=&r"(tmp) \
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| 27 | : "r"(&v->counter), "r"(i) \
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| 28 | : "cc", "memory"); \
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| 29 | }
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| 30 |
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| 31 |
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| 32 | #define ATOMIC_OP_RETURN(op) \
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| 33 | static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
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| 34 | { \
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| 35 | int tmp; \
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| 36 | \
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| 37 | __asm__ __volatile__( \
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| 38 | "1: l.lwa %0,0(%1) \n" \
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| 39 | " l." #op " %0,%0,%2 \n" \
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| 40 | " l.swa 0(%1),%0 \n" \
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| 41 | " l.bnf 1b \n" \
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| 42 | " l.nop \n" \
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| 43 | : "=&r"(tmp) \
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| 44 | : "r"(&v->counter), "r"(i) \
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| 45 | : "cc", "memory"); \
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| 46 | \
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| 47 | return tmp; \
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| 48 | }
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| 49 |
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| 50 |
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| 51 | #define ATOMIC_FETCH_OP(op) \
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| 52 | static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
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| 53 | { \
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| 54 | int tmp, old; \
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| 55 | \
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| 56 | __asm__ __volatile__( \
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| 57 | "1: l.lwa %0,0(%2) \n" \
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| 58 | " l." #op " %1,%0,%3 \n" \
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| 59 | " l.swa 0(%2),%1 \n" \
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| 60 | " l.bnf 1b \n" \
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| 61 | " l.nop \n" \
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| 62 | : "=&r"(old), "=&r"(tmp) \
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| 63 | : "r"(&v->counter), "r"(i) \
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| 64 | : "cc", "memory"); \
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| 65 | \
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| 66 | return old; \
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| 67 | }
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| 68 |
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| 69 | ATOMIC_OP_RETURN(add)
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| 70 | ATOMIC_OP_RETURN(sub)
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| 71 |
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| 72 | ATOMIC_FETCH_OP(add)
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| 73 | ATOMIC_FETCH_OP(sub)
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| 74 | ATOMIC_FETCH_OP(and)
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| 75 | ATOMIC_FETCH_OP(or)
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| 76 | ATOMIC_FETCH_OP(xor)
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| 77 |
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| 78 | ATOMIC_OP(add)
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| 79 | ATOMIC_OP(sub)
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| 80 | ATOMIC_OP(and)
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| 81 | ATOMIC_OP(or)
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| 82 | ATOMIC_OP(xor)
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| 83 |
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| 84 | #undef ATOMIC_FETCH_OP
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| 85 | #undef ATOMIC_OP_RETURN
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| 86 | #undef ATOMIC_OP
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| 87 |
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| 88 | #define arch_atomic_add_return arch_atomic_add_return
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| 89 | #define arch_atomic_sub_return arch_atomic_sub_return
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| 90 | #define arch_atomic_fetch_add arch_atomic_fetch_add
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| 91 | #define arch_atomic_fetch_sub arch_atomic_fetch_sub
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| 92 | #define arch_atomic_fetch_and arch_atomic_fetch_and
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| 93 | #define arch_atomic_fetch_or arch_atomic_fetch_or
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| 94 | #define arch_atomic_fetch_xor arch_atomic_fetch_xor
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| 95 | #define arch_atomic_add arch_atomic_add
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| 96 | #define arch_atomic_sub arch_atomic_sub
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| 97 | #define arch_atomic_and arch_atomic_and
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| 98 | #define arch_atomic_or arch_atomic_or
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| 99 | #define arch_atomic_xor arch_atomic_xor
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| 100 |
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| 101 | |
| 102 | * Atomically add a to v->counter as long as v is not already u.
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| 103 | * Returns the original value at v->counter.
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| 104 | *
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| 105 | * This is often used through atomic_inc_not_zero()
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| 106 |
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| 107 | static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
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| 108 | {
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| 109 | int old, tmp;
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| 110 |
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| 111 | __asm__ __volatile__(
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| 112 | "1: l.lwa %0, 0(%2) \n"
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| 113 | " l.sfeq %0, %4 \n"
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| 114 | " l.bf 2f \n"
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| 115 | " l.add %1, %0, %3 \n"
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| 116 | " l.swa 0(%2), %1 \n"
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| 117 | " l.bnf 1b \n"
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| 118 | " l.nop \n"
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| 119 | "2: \n"
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| 120 | : "=&r"(old), "=&r" (tmp)
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| 121 | : "r"(&v->counter), "r"(a), "r"(u)
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| 122 | : "cc", "memory");
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| 123 |
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| 124 | return old;
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| 125 | }
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| 126 | #define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
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| 127 |
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| 128 | #define arch_atomic_read(v) READ_ONCE((v)->counter)
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| 129 | #define arch_atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
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| 130 |
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| 131 | #include <asm/cmpxchg.h>
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| 132 |
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| 133 | #endif
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