Orange Pi5 kernel

/* 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__ */