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