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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
 */

#ifndef _ASM_PARISC_ATOMIC_H_
#define _ASM_PARISC_ATOMIC_H_

#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 * And probably incredibly slow on parisc.  OTOH, we don't
 * have to write any serious assembly.   prumpf
 */

#ifdef CONFIG_SMP
#include <asm/spinlock.h>
#include <asm/cache.h>		/* we use L1_CACHE_BYTES */

/* Use an array of spinlocks for our atomic_ts.
 * Hash function to index into a different SPINLOCK.
 * Since "a" is usually an address, use one spinlock per cacheline.
 */
#  define ATOMIC_HASH_SIZE 4
#  define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))

extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;

/* Can't use raw_spin_lock_irq because of #include problems, so
 * this is the substitute */
#define _atomic_spin_lock_irqsave(l,f) do {	\
	arch_spinlock_t *s = ATOMIC_HASH(l);		\
	local_irq_save(f);			\
	arch_spin_lock(s);			\
} while(0)

#define _atomic_spin_unlock_irqrestore(l,f) do {	\
	arch_spinlock_t *s = ATOMIC_HASH(l);			\
	arch_spin_unlock(s);				\
	local_irq_restore(f);				\
} while(0)


#else
#  define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
#  define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
#endif

/*
 * Note that we need not lock read accesses - aligned word writes/reads
 * are atomic, so a reader never sees inconsistent values.
 */

static __inline__ void atomic_set(atomic_t *v, int i)
{
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	v->counter = i;

	_atomic_spin_unlock_irqrestore(v, flags);
}

#define atomic_set_release(v, i)	atomic_set((v), (i))

static __inline__ int atomic_read(const atomic_t *v)
{
	return READ_ONCE((v)->counter);
}

/* exported interface */
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * __atomic_add_unless - add unless the number is a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns the old value of @v.
 */
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int c, old;
	c = atomic_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c;
}

#define ATOMIC_OP(op, c_op)						\
static __inline__ void atomic_##op(int i, atomic_t *v)			\
{									\
	unsigned long flags;						\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	v->counter c_op i;						\
	_atomic_spin_unlock_irqrestore(v, flags);			\
}									\

#define ATOMIC_OP_RETURN(op, c_op)					\
static __inline__ int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	unsigned long flags;						\
	int ret;							\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	ret = (v->counter c_op i);					\
	_atomic_spin_unlock_irqrestore(v, flags);			\
									\
	return ret;							\
}

#define ATOMIC_FETCH_OP(op, c_op)					\
static __inline__ int atomic_fetch_##op(int i, atomic_t *v)		\
{									\
	unsigned long flags;						\
	int ret;							\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	ret = v->counter;						\
	v->counter c_op i;						\
	_atomic_spin_unlock_irqrestore(v, flags);			\
									\
	return ret;							\
}

#define ATOMIC_OPS(op, c_op)						\
	ATOMIC_OP(op, c_op)						\
	ATOMIC_OP_RETURN(op, c_op)					\
	ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(add, +=)
ATOMIC_OPS(sub, -=)

#undef ATOMIC_OPS
#define ATOMIC_OPS(op, c_op)						\
	ATOMIC_OP(op, c_op)						\
	ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(and, &=)
ATOMIC_OPS(or, |=)
ATOMIC_OPS(xor, ^=)

#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

#define atomic_inc(v)	(atomic_add(   1,(v)))
#define atomic_dec(v)	(atomic_add(  -1,(v)))

#define atomic_inc_return(v)	(atomic_add_return(   1,(v)))
#define atomic_dec_return(v)	(atomic_add_return(  -1,(v)))

#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

/*
 * atomic_inc_and_test - increment and test
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1
 * and returns true if the result is zero, or false for all
 * other cases.
 */
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)

#define atomic_dec_and_test(v)	(atomic_dec_return(v) == 0)

#define atomic_sub_and_test(i,v)	(atomic_sub_return((i),(v)) == 0)

#define ATOMIC_INIT(i)	{ (i) }

#ifdef CONFIG_64BIT

#define ATOMIC64_INIT(i) { (i) }

#define ATOMIC64_OP(op, c_op)						\
static __inline__ void atomic64_##op(s64 i, atomic64_t *v)		\
{									\
	unsigned long flags;						\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	v->counter c_op i;						\
	_atomic_spin_unlock_irqrestore(v, flags);			\
}									\

#define ATOMIC64_OP_RETURN(op, c_op)					\
static __inline__ s64 atomic64_##op##_return(s64 i, atomic64_t *v)	\
{									\
	unsigned long flags;						\
	s64 ret;							\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	ret = (v->counter c_op i);					\
	_atomic_spin_unlock_irqrestore(v, flags);			\
									\
	return ret;							\
}

#define ATOMIC64_FETCH_OP(op, c_op)					\
static __inline__ s64 atomic64_fetch_##op(s64 i, atomic64_t *v)		\
{									\
	unsigned long flags;						\
	s64 ret;							\
									\
	_atomic_spin_lock_irqsave(v, flags);				\
	ret = v->counter;						\
	v->counter c_op i;						\
	_atomic_spin_unlock_irqrestore(v, flags);			\
									\
	return ret;							\
}

#define ATOMIC64_OPS(op, c_op)						\
	ATOMIC64_OP(op, c_op)						\
	ATOMIC64_OP_RETURN(op, c_op)					\
	ATOMIC64_FETCH_OP(op, c_op)

ATOMIC64_OPS(add, +=)
ATOMIC64_OPS(sub, -=)

#undef ATOMIC64_OPS
#define ATOMIC64_OPS(op, c_op)						\
	ATOMIC64_OP(op, c_op)						\
	ATOMIC64_FETCH_OP(op, c_op)

ATOMIC64_OPS(and, &=)
ATOMIC64_OPS(or, |=)
ATOMIC64_OPS(xor, ^=)

#undef ATOMIC64_OPS
#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP

static __inline__ void
atomic64_set(atomic64_t *v, s64 i)
{
	unsigned long flags;
	_atomic_spin_lock_irqsave(v, flags);

	v->counter = i;

	_atomic_spin_unlock_irqrestore(v, flags);
}

#define atomic64_set_release(v, i)	atomic64_set((v), (i))

static __inline__ s64
atomic64_read(const atomic64_t *v)
{
	return READ_ONCE((v)->counter);
}

#define atomic64_inc(v)		(atomic64_add(   1,(v)))
#define atomic64_dec(v)		(atomic64_add(  -1,(v)))

#define atomic64_inc_return(v)		(atomic64_add_return(   1,(v)))
#define atomic64_dec_return(v)		(atomic64_add_return(  -1,(v)))

#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)

#define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)
#define atomic64_dec_and_test(v)	(atomic64_dec_return(v) == 0)
#define atomic64_sub_and_test(i,v)	(atomic64_sub_return((i),(v)) == 0)

/* exported interface */
#define atomic64_cmpxchg(v, o, n) \
	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

/**
 * atomic64_add_unless - add unless the number is a given value
 * @v: pointer of type atomic64_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns the old value of @v.
 */
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
	long c, old;
	c = atomic64_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic64_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c != (u);
}

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

/*
 * atomic64_dec_if_positive - decrement by 1 if old value positive
 * @v: pointer of type atomic_t
 *
 * The function returns the old value of *v minus 1, even if
 * the atomic variable, v, was not decremented.
 */
static inline long atomic64_dec_if_positive(atomic64_t *v)
{
	long c, old, dec;
	c = atomic64_read(v);
	for (;;) {
		dec = c - 1;
		if (unlikely(dec < 0))
			break;
		old = atomic64_cmpxchg((v), c, dec);
		if (likely(old == c))
			break;
		c = old;
	}
	return dec;
}

#endif /* !CONFIG_64BIT */


#endif /* _ASM_PARISC_ATOMIC_H_ */

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Name Type Size Permission Actions
Kbuild File 610 B 0644
agp.h File 596 B 0644
asm-offsets.h File 35 B 0644
asmregs.h File 3.04 KB 0644
assembly.h File 12.94 KB 0644
atomic.h File 8.24 KB 0644
barrier.h File 2.44 KB 0644
bitops.h File 5.89 KB 0644
bug.h File 2.35 KB 0644
bugs.h File 340 B 0644
cache.h File 1.59 KB 0644
cacheflush.h File 4.06 KB 0644
checksum.h File 5.48 KB 0644
cmpxchg.h File 3.62 KB 0644
compat.h File 6.52 KB 0644
compat_ucontext.h File 591 B 0644
delay.h File 533 B 0644
dma-mapping.h File 2.42 KB 0644
dma.h File 5.71 KB 0644
dwarf.h File 602 B 0644
eisa_bus.h File 702 B 0644
eisa_eeprom.h File 4.42 KB 0644
elf.h File 14.31 KB 0644
fb.h File 403 B 0644
fixmap.h File 1.15 KB 0644
floppy.h File 6.61 KB 0644
ftrace.h File 379 B 0644
futex.h File 2.66 KB 0644
grfioctl.h File 4.68 KB 0644
hardirq.h File 1.3 KB 0644
hardware.h File 4.1 KB 0644
hash.h File 5.07 KB 0644
hugetlb.h File 1.67 KB 0644
ide.h File 1.09 KB 0644
io.h File 8.14 KB 0644
irq.h File 1.23 KB 0644
irqflags.h File 1.02 KB 0644
kbdleds.h File 477 B 0644
kmap_types.h File 221 B 0644
ldcw.h File 2.15 KB 0644
led.h File 1.33 KB 0644
linkage.h File 759 B 0644
machdep.h File 349 B 0644
mckinley.h File 270 B 0644
mmu.h File 195 B 0644
mmu_context.h File 2.08 KB 0644
mmzone.h File 1.51 KB 0644
module.h File 527 B 0644
page.h File 5.42 KB 0644
parisc-device.h File 1.92 KB 0644
parport.h File 358 B 0644
pci.h File 6.57 KB 0644
pdc.h File 3.93 KB 0644
pdc_chassis.h File 15.06 KB 0644
pdcpat.h File 15 KB 0644
perf.h File 1.89 KB 0644
perf_event.h File 152 B 0644
pgalloc.h File 4.22 KB 0644
pgtable.h File 18.92 KB 0644
prefetch.h File 1.12 KB 0644
processor.h File 9.86 KB 0644
psw.h File 2.39 KB 0644
ptrace.h File 803 B 0644
ropes.h File 9.73 KB 0644
rt_sigframe.h File 745 B 0644
runway.h File 320 B 0644
sections.h File 283 B 0644
serial.h File 124 B 0644
shmparam.h File 263 B 0644
signal.h File 841 B 0644
smp.h File 1.25 KB 0644
socket.h File 311 B 0644
special_insns.h File 1015 B 0644
spinlock.h File 4.02 KB 0644
spinlock_types.h File 483 B 0644
string.h File 247 B 0644
superio.h File 3.25 KB 0644
switch_to.h File 332 B 0644
syscall.h File 1.4 KB 0644
termios.h File 1.72 KB 0644
thread_info.h File 3.15 KB 0644
timex.h File 372 B 0644
tlb.h File 672 B 0644
tlbflush.h File 2.63 KB 0644
topology.h File 900 B 0644
traps.h File 468 B 0644
uaccess.h File 6.55 KB 0644
ucontext.h File 327 B 0644
unaligned.h File 472 B 0644
unistd.h File 5.47 KB 0644
unwind.h File 2.56 KB 0644