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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__ */

Filemanager

Name Type Size Permission Actions
Kbuild File 491 B 0644
agp.h File 434 B 0644
apb.h File 1.06 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 727 B 0644
asm.h File 1.08 KB 0644
asmmacro.h File 1.16 KB 0644
atomic.h File 219 B 0644
atomic_32.h File 2.26 KB 0644
atomic_64.h File 3.34 KB 0644
auxio.h File 310 B 0644
auxio_32.h File 2.55 KB 0644
auxio_64.h File 3.18 KB 0644
backoff.h File 2.7 KB 0644
barrier.h File 223 B 0644
barrier_32.h File 160 B 0644
barrier_64.h File 1.96 KB 0644
bbc.h File 9.76 KB 0644
bitext.h File 631 B 0644
bitops.h File 219 B 0644
bitops_32.h File 2.79 KB 0644
bitops_64.h File 1.64 KB 0644
btext.h File 145 B 0644
bug.h File 588 B 0644
bugs.h File 404 B 0644
cache.h File 649 B 0644
cacheflush.h File 373 B 0644
cacheflush_32.h File 1.97 KB 0644
cacheflush_64.h File 2.56 KB 0644
cachetlb_32.h File 882 B 0644
chafsr.h File 9.48 KB 0644
checksum.h File 227 B 0644
checksum_32.h File 6.81 KB 0644
checksum_64.h File 4.4 KB 0644
chmctrl.h File 7.91 KB 0644
clock.h File 231 B 0644
clocksource.h File 407 B 0644
cmpxchg.h File 223 B 0644
cmpxchg_32.h File 2.4 KB 0644
cmpxchg_64.h File 5.13 KB 0644
compat.h File 6.45 KB 0644
compat_signal.h File 565 B 0644
contregs.h File 1.9 KB 0644
cpu_type.h File 579 B 0644
cpudata.h File 378 B 0644
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cpudata_64.h File 1.13 KB 0644
current.h File 991 B 0644
dcr.h File 728 B 0644
dcu.h File 1.48 KB 0644
delay.h File 215 B 0644
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device.h File 565 B 0644
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hardirq.h File 223 B 0644
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head.h File 211 B 0644
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hvtramp.h File 782 B 0644
hw_irq.h File 88 B 0644
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prom.h File 2.02 KB 0644
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spinlock_64.h File 409 B 0644
spinlock_types.h File 549 B 0644
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starfire.h File 418 B 0644
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string_64.h File 505 B 0644
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swift.h File 3.07 KB 0644
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syscall.h File 3.41 KB 0644
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thread_info.h File 239 B 0644
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thread_info_64.h File 7.84 KB 0644
timer.h File 215 B 0644
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timer_64.h File 2.37 KB 0644
timex.h File 215 B 0644
timex_32.h File 266 B 0644
timex_64.h File 423 B 0644
tlb.h File 207 B 0644
tlb_32.h File 520 B 0644
tlb_64.h File 913 B 0644
tlbflush.h File 227 B 0644
tlbflush_32.h File 621 B 0644
tlbflush_64.h File 1.73 KB 0644
topology.h File 227 B 0644
topology_32.h File 170 B 0644
topology_64.h File 1.51 KB 0644
trap_block.h File 6.51 KB 0644
traps.h File 577 B 0644
tsb.h File 12.17 KB 0644
tsunami.h File 1.85 KB 0644
ttable.h File 20.08 KB 0644
turbosparc.h File 3.78 KB 0644
uaccess.h File 363 B 0644
uaccess_32.h File 8.31 KB 0644
uaccess_64.h File 6.05 KB 0644
unaligned.h File 339 B 0644
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vga.h File 964 B 0644
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vio.h File 11.81 KB 0644
visasm.h File 1.51 KB 0644
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winmacro.h File 4.66 KB 0644
xor.h File 207 B 0644
xor_32.h File 7.31 KB 0644
xor_64.h File 2.5 KB 0644