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80 lines
2.4 KiB
80 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* 32-bit atomic xchg() and cmpxchg() definitions. |
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* |
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* Copyright (C) 1996 David S. Miller ([email protected]) |
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* Copyright (C) 2000 Anton Blanchard ([email protected]) |
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* Copyright (C) 2007 Kyle McMartin ([email protected]) |
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* |
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* Additions by Keith M Wesolowski ([email protected]) based |
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* on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <[email protected]>. |
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*/ |
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#ifndef __ARCH_SPARC_CMPXCHG__ |
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#define __ARCH_SPARC_CMPXCHG__ |
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unsigned long __xchg_u32(volatile u32 *m, u32 new); |
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void __xchg_called_with_bad_pointer(void); |
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static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size) |
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{ |
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switch (size) { |
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case 4: |
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return __xchg_u32(ptr, x); |
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} |
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__xchg_called_with_bad_pointer(); |
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return x; |
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} |
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#define xchg(ptr,x) ({(__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)));}) |
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/* Emulate cmpxchg() the same way we emulate atomics, |
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* by hashing the object address and indexing into an array |
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* of spinlocks to get a bit of performance... |
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* |
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* See arch/sparc/lib/atomic32.c for implementation. |
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* |
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* Cribbed from <asm-parisc/atomic.h> |
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*/ |
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/* bug catcher for when unsupported size is used - won't link */ |
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void __cmpxchg_called_with_bad_pointer(void); |
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/* we only need to support cmpxchg of a u32 on sparc */ |
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unsigned long __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_); |
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/* don't worry...optimizer will get rid of most of this */ |
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static inline unsigned long |
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) |
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{ |
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switch (size) { |
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case 4: |
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return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_); |
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default: |
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__cmpxchg_called_with_bad_pointer(); |
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break; |
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} |
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return old; |
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} |
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#define cmpxchg(ptr, o, n) \ |
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({ \ |
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__typeof__(*(ptr)) _o_ = (o); \ |
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__typeof__(*(ptr)) _n_ = (n); \ |
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ |
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(unsigned long)_n_, sizeof(*(ptr))); \ |
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}) |
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u64 __cmpxchg_u64(u64 *ptr, u64 old, u64 new); |
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#define cmpxchg64(ptr, old, new) __cmpxchg_u64(ptr, old, new) |
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#include <asm-generic/cmpxchg-local.h> |
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/* |
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make |
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* them available. |
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*/ |
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#define cmpxchg_local(ptr, o, n) \ |
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((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\ |
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(unsigned long)(n), sizeof(*(ptr)))) |
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) |
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#endif /* __ARCH_SPARC_CMPXCHG__ */
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