| 1 | |
| 2 |
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| 3 | #include <asm/barrier.h>
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| 4 | #include <asm/rwonce.h>
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| 5 | #include <linux/atomic.h>
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| 6 |
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| 7 | #define GEN_READ_HELPER(tname, type) \
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| 8 | __rust_helper type rust_helper_atomic_##tname##_read(type *ptr) \
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| 9 | { \
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| 10 | return READ_ONCE(*ptr); \
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| 11 | }
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| 12 |
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| 13 | #define GEN_SET_HELPER(tname, type) \
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| 14 | __rust_helper void rust_helper_atomic_##tname##_set(type *ptr, type val) \
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| 15 | { \
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| 16 | WRITE_ONCE(*ptr, val); \
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| 17 | }
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| 18 |
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| 19 | #define GEN_READ_ACQUIRE_HELPER(tname, type) \
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| 20 | __rust_helper type rust_helper_atomic_##tname##_read_acquire(type *ptr) \
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| 21 | { \
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| 22 | return smp_load_acquire(ptr); \
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| 23 | }
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| 24 |
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| 25 | #define GEN_SET_RELEASE_HELPER(tname, type) \
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| 26 | __rust_helper void rust_helper_atomic_##tname##_set_release(type *ptr, type val)\
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| 27 | { \
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| 28 | smp_store_release(ptr, val); \
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| 29 | }
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| 30 |
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| 31 | #define GEN_READ_SET_HELPERS(tname, type) \
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| 32 | GEN_READ_HELPER(tname, type) \
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| 33 | GEN_SET_HELPER(tname, type) \
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| 34 | GEN_READ_ACQUIRE_HELPER(tname, type) \
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| 35 | GEN_SET_RELEASE_HELPER(tname, type) \
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| 36 |
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| 37 | GEN_READ_SET_HELPERS(i8, s8)
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| 38 | GEN_READ_SET_HELPERS(i16, s16)
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| 39 | GEN_READ_SET_HELPERS(ptr, const void *)
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| 40 |
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| 41 | |
| 42 | * xchg helpers depend on ARCH_SUPPORTS_ATOMIC_RMW and on the
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| 43 | * architecture provding xchg() support for i8 and i16.
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| 44 | *
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| 45 | * The architectures that currently support Rust (x86_64, armv7,
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| 46 | * arm64, riscv, and loongarch) satisfy these requirements.
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| 47 |
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| 48 | #define GEN_XCHG_HELPER(tname, type, suffix) \
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| 49 | __rust_helper type \
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| 50 | rust_helper_atomic_##tname##_xchg##suffix(type *ptr, type new) \
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| 51 | { \
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| 52 | return xchg##suffix(ptr, new); \
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| 53 | }
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| 54 |
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| 55 | #define GEN_XCHG_HELPERS(tname, type) \
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| 56 | GEN_XCHG_HELPER(tname, type, ) \
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| 57 | GEN_XCHG_HELPER(tname, type, _acquire) \
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| 58 | GEN_XCHG_HELPER(tname, type, _release) \
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| 59 | GEN_XCHG_HELPER(tname, type, _relaxed) \
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| 60 |
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| 61 | GEN_XCHG_HELPERS(i8, s8)
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| 62 | GEN_XCHG_HELPERS(i16, s16)
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| 63 | GEN_XCHG_HELPERS(ptr, const void *)
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| 64 |
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| 65 | |
| 66 | * try_cmpxchg helpers depend on ARCH_SUPPORTS_ATOMIC_RMW and on the
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| 67 | * architecture provding try_cmpxchg() support for i8 and i16.
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| 68 | *
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| 69 | * The architectures that currently support Rust (x86_64, armv7,
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| 70 | * arm64, riscv, and loongarch) satisfy these requirements.
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| 71 |
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| 72 | #define GEN_TRY_CMPXCHG_HELPER(tname, type, suffix) \
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| 73 | __rust_helper bool \
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| 74 | rust_helper_atomic_##tname##_try_cmpxchg##suffix(type *ptr, type *old, type new)\
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| 75 | { \
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| 76 | return try_cmpxchg##suffix(ptr, old, new); \
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| 77 | }
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| 78 |
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| 79 | #define GEN_TRY_CMPXCHG_HELPERS(tname, type) \
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| 80 | GEN_TRY_CMPXCHG_HELPER(tname, type, ) \
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| 81 | GEN_TRY_CMPXCHG_HELPER(tname, type, _acquire) \
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| 82 | GEN_TRY_CMPXCHG_HELPER(tname, type, _release) \
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| 83 | GEN_TRY_CMPXCHG_HELPER(tname, type, _relaxed) \
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| 84 |
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| 85 | GEN_TRY_CMPXCHG_HELPERS(i8, s8)
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| 86 | GEN_TRY_CMPXCHG_HELPERS(i16, s16)
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| 87 | GEN_TRY_CMPXCHG_HELPERS(ptr, const void *)
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