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/*
 * Generic C implementation of atomic counter operations. Usable on
 * UP systems only. Do not include in machine independent code.
 *
 * Originally implemented for MN10300.
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef __ASM_GENERIC_ATOMIC_H
#define __ASM_GENERIC_ATOMIC_H

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

/*
 * atomic_$op() - $op integer to atomic variable
 * @i: integer value to $op
 * @v: pointer to the atomic variable
 *
 * Atomically $ops @i to @v. Does not strictly guarantee a memory-barrier, use
 * smp_mb__{before,after}_atomic().
 */

/*
 * atomic_$op_return() - $op interer to atomic variable and returns the result
 * @i: integer value to $op
 * @v: pointer to the atomic variable
 *
 * Atomically $ops @i to @v. Does imply a full memory barrier.
 */

#ifdef CONFIG_SMP

/* we can build all atomic primitives from cmpxchg */

#define ATOMIC_OP(op, c_op)						\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
}

#define ATOMIC_OP_RETURN(op, c_op)					\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
									\
	return c c_op i;						\
}

#define ATOMIC_FETCH_OP(op, c_op)					\
static inline int atomic_fetch_##op(int i, atomic_t *v)			\
{									\
	int c, old;							\
									\
	c = v->counter;							\
	while ((old = cmpxchg(&v->counter, c, c c_op i)) != c)		\
		c = old;						\
									\
	return c;							\
}

#else

#include <linux/irqflags.h>

#define ATOMIC_OP(op, c_op)						\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	unsigned long flags;						\
									\
	raw_local_irq_save(flags);					\
	v->counter = v->counter c_op i;					\
	raw_local_irq_restore(flags);					\
}

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

#endif /* CONFIG_SMP */

#ifndef atomic_add_return
ATOMIC_OP_RETURN(add, +)
#endif

#ifndef atomic_sub_return
ATOMIC_OP_RETURN(sub, -)
#endif

#ifndef atomic_fetch_add
ATOMIC_FETCH_OP(add, +)
#endif

#ifndef atomic_fetch_sub
ATOMIC_FETCH_OP(sub, -)
#endif

#ifndef atomic_fetch_and
ATOMIC_FETCH_OP(and, &)
#endif

#ifndef atomic_fetch_or
ATOMIC_FETCH_OP(or, |)
#endif

#ifndef atomic_fetch_xor
ATOMIC_FETCH_OP(xor, ^)
#endif

#ifndef atomic_and
ATOMIC_OP(and, &)
#endif

#ifndef atomic_or
ATOMIC_OP(or, |)
#endif

#ifndef atomic_xor
ATOMIC_OP(xor, ^)
#endif

#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

#define ATOMIC_INIT(i)	{ (i) }

/**
 * atomic_read - read atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically reads the value of @v.
 */
#ifndef atomic_read
#define atomic_read(v)	READ_ONCE((v)->counter)
#endif

/**
 * atomic_set - set atomic variable
 * @v: pointer of type atomic_t
 * @i: required value
 *
 * Atomically sets the value of @v to @i.
 */
#define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))

#include <linux/irqflags.h>

static inline int atomic_add_negative(int i, atomic_t *v)
{
	return atomic_add_return(i, v) < 0;
}

static inline void atomic_add(int i, atomic_t *v)
{
	atomic_add_return(i, v);
}

static inline void atomic_sub(int i, atomic_t *v)
{
	atomic_sub_return(i, v);
}

static inline void atomic_inc(atomic_t *v)
{
	atomic_add_return(1, v);
}

static inline void atomic_dec(atomic_t *v)
{
	atomic_sub_return(1, v);
}

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

#define atomic_sub_and_test(i, v)	(atomic_sub_return((i), (v)) == 0)
#define atomic_dec_and_test(v)		(atomic_dec_return(v) == 0)
#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)

#define atomic_xchg(ptr, v)		(xchg(&(ptr)->counter, (v)))
#define atomic_cmpxchg(v, old, new)	(cmpxchg(&((v)->counter), (old), (new)))

#ifndef __atomic_add_unless
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int c, old;
	c = atomic_read(v);
	while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
		c = old;
	return c;
}
#endif

#endif /* __ASM_GENERIC_ATOMIC_H */

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Name Type Size Permission Actions
bitops Folder 0755
4level-fixup.h File 1.07 KB 0644
5level-fixup.h File 1.15 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 507 B 0644
atomic-long.h File 7.09 KB 0644
atomic.h File 5.11 KB 0644
atomic64.h File 2.26 KB 0644
audit_change_attr.h File 484 B 0644
audit_dir_write.h File 500 B 0644
audit_read.h File 241 B 0644
audit_signal.h File 36 B 0644
audit_write.h File 461 B 0644
barrier.h File 6.01 KB 0644
bitops.h File 1.09 KB 0644
bitsperlong.h File 592 B 0644
bug.h File 6.6 KB 0644
bugs.h File 267 B 0644
cache.h File 384 B 0644
cacheflush.h File 1.31 KB 0644
checksum.h File 2.27 KB 0644
clkdev.h File 706 B 0644
cmpxchg-local.h File 1.43 KB 0644
cmpxchg.h File 2.23 KB 0644
current.h File 256 B 0644
delay.h File 1.13 KB 0644
device.h File 245 B 0644
div64.h File 7.28 KB 0644
dma-contiguous.h File 238 B 0644
dma.h File 553 B 0644
early_ioremap.h File 1.66 KB 0644
emergency-restart.h File 248 B 0644
exec.h File 697 B 0644
export.h File 2.2 KB 0644
extable.h File 802 B 0644
fb.h File 271 B 0644
fixmap.h File 2.84 KB 0644
ftrace.h File 460 B 0644
futex.h File 2.88 KB 0644
getorder.h File 1.22 KB 0644
gpio.h File 4.45 KB 0644
hardirq.h File 532 B 0644
hugetlb.h File 845 B 0644
hw_irq.h File 270 B 0644
ide_iops.h File 791 B 0644
int-ll64.h File 932 B 0644
io.h File 20.39 KB 0644
ioctl.h File 506 B 0644
iomap.h File 3.16 KB 0644
irq.h File 403 B 0644
irq_regs.h File 980 B 0644
irq_work.h File 194 B 0644
irqflags.h File 1.51 KB 0644
kdebug.h File 182 B 0644
kmap_types.h File 198 B 0644
kprobes.h File 868 B 0644
kvm_para.h File 480 B 0644
linkage.h File 225 B 0644
local.h File 2.23 KB 0644
local64.h File 3.8 KB 0644
mcs_spinlock.h File 260 B 0644
memory_model.h File 2.16 KB 0644
mm-arch-hooks.h File 388 B 0644
mm_hooks.h File 885 B 0644
mmu.h File 449 B 0644
mmu_context.h File 881 B 0644
module.h File 1.09 KB 0644
msi.h File 838 B 0644
page.h File 2.4 KB 0644
param.h File 367 B 0644
parport.h File 604 B 0644
pci.h File 581 B 0644
pci_iomap.h File 1.96 KB 0644
percpu.h File 12.72 KB 0644
pgalloc.h File 342 B 0644
pgtable-nop4d-hack.h File 1.86 KB 0644
pgtable-nop4d.h File 1.64 KB 0644
pgtable-nopmd.h File 1.9 KB 0644
pgtable-nopud.h File 1.97 KB 0644
pgtable.h File 29.5 KB 0644
preempt.h File 1.94 KB 0644
ptrace.h File 1.58 KB 0644
qrwlock.h File 3.78 KB 0644
qrwlock_types.h File 655 B 0644
qspinlock.h File 3.67 KB 0644
qspinlock_types.h File 2.77 KB 0644
resource.h File 1.07 KB 0644
rwsem.h File 3.21 KB 0644
seccomp.h File 1.3 KB 0644
sections.h File 4.79 KB 0644
segment.h File 249 B 0644
serial.h File 345 B 0644
set_memory.h File 362 B 0644
signal.h File 308 B 0644
simd.h File 436 B 0644
sizes.h File 78 B 0644
spinlock.h File 329 B 0644
statfs.h File 169 B 0644
string.h File 281 B 0644
switch_to.h File 992 B 0644
syscall.h File 6.18 KB 0644
syscalls.h File 739 B 0644
termios-base.h File 2.11 KB 0644
termios.h File 2.81 KB 0644
timex.h File 508 B 0644
tlb.h File 9.5 KB 0644
tlbflush.h File 485 B 0644
topology.h File 2.18 KB 0644
trace_clock.h File 391 B 0644
uaccess.h File 5.22 KB 0644
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user.h File 242 B 0644
vga.h File 587 B 0644
vmlinux.lds.h File 29.17 KB 0644
vtime.h File 52 B 0644
word-at-a-time.h File 2.75 KB 0644
xor.h File 13.63 KB 0644