From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/sparc/include/asm/cmpxchg_32.h | 80 +++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 arch/sparc/include/asm/cmpxchg_32.h (limited to 'arch/sparc/include/asm/cmpxchg_32.h') diff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h new file mode 100644 index 000000000..27a57a3a7 --- /dev/null +++ b/arch/sparc/include/asm/cmpxchg_32.h @@ -0,0 +1,80 @@ +/* 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 . + */ + +#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 arch_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 + */ + +/* 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 arch_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 arch_cmpxchg64(ptr, old, new) __cmpxchg_u64(ptr, old, new) + +#include + +/* + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make + * them available. + */ +#define arch_cmpxchg_local(ptr, o, n) \ + ((__typeof__(*(ptr)))__generic_cmpxchg_local((ptr), (unsigned long)(o),\ + (unsigned long)(n), sizeof(*(ptr)))) +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n)) + +#endif /* __ARCH_SPARC_CMPXCHG__ */ -- cgit v1.2.3