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/* atomic.h: atomic operation emulation for FR-V
 *
 * For an explanation of how atomic ops work in this arch, see:
 *   Documentation/frv/atomic-ops.txt
 *
 * Copyright (C) 2004 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 License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#ifndef _ASM_ATOMIC_H
#define _ASM_ATOMIC_H

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

#ifdef CONFIG_SMP
#error not SMP safe
#endif

#include <asm/atomic_defs.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 * We do not have SMP systems, so we don't have to deal with that.
 */

#define ATOMIC_INIT(i)		{ (i) }
#define atomic_read(v)		READ_ONCE((v)->counter)
#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))

static inline int atomic_inc_return(atomic_t *v)
{
	return __atomic_add_return(1, &v->counter);
}

static inline int atomic_dec_return(atomic_t *v)
{
	return __atomic_sub_return(1, &v->counter);
}

static inline int atomic_add_return(int i, atomic_t *v)
{
	return __atomic_add_return(i, &v->counter);
}

static inline int atomic_sub_return(int i, atomic_t *v)
{
	return __atomic_sub_return(i, &v->counter);
}

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

static inline void atomic_inc(atomic_t *v)
{
	atomic_inc_return(v);
}

static inline void atomic_dec(atomic_t *v)
{
	atomic_dec_return(v);
}

#define atomic_sub_and_test(i,v)	(atomic_sub_return((i), (v)) == 0)
#define atomic_dec_and_test(v)		(atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v)		(atomic_add_return(1, (v)) == 0)

/*
 * 64-bit atomic ops
 */
typedef struct {
	long long counter;
} atomic64_t;

#define ATOMIC64_INIT(i)	{ (i) }

static inline long long atomic64_read(const atomic64_t *v)
{
	long long counter;

	asm("ldd%I1 %M1,%0"
	    : "=e"(counter)
	    : "m"(v->counter));

	return counter;
}

static inline void atomic64_set(atomic64_t *v, long long i)
{
	asm volatile("std%I0 %1,%M0"
		     : "=m"(v->counter)
		     : "e"(i));
}

static inline long long atomic64_inc_return(atomic64_t *v)
{
	return __atomic64_add_return(1, &v->counter);
}

static inline long long atomic64_dec_return(atomic64_t *v)
{
	return __atomic64_sub_return(1, &v->counter);
}

static inline long long atomic64_add_return(long long i, atomic64_t *v)
{
	return __atomic64_add_return(i, &v->counter);
}

static inline long long atomic64_sub_return(long long i, atomic64_t *v)
{
	return __atomic64_sub_return(i, &v->counter);
}

static inline long long atomic64_add_negative(long long i, atomic64_t *v)
{
	return atomic64_add_return(i, v) < 0;
}

static inline void atomic64_inc(atomic64_t *v)
{
	atomic64_inc_return(v);
}

static inline void atomic64_dec(atomic64_t *v)
{
	atomic64_dec_return(v);
}

#define atomic64_sub_and_test(i,v)	(atomic64_sub_return((i), (v)) == 0)
#define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)
#define atomic64_inc_and_test(v)	(atomic64_inc_return((v)) == 0)
#define atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1, 0)

#define atomic_cmpxchg(v, old, new)	(cmpxchg(&(v)->counter, old, new))
#define atomic_xchg(v, new)		(xchg(&(v)->counter, new))
#define atomic64_cmpxchg(v, old, new)	(__cmpxchg_64(old, new, &(v)->counter))
#define atomic64_xchg(v, new)		(__xchg_64(new, &(v)->counter))

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;
}

static inline int atomic64_add_unless(atomic64_t *v, long long i, long long u)
{
	long long c, old;

	c = atomic64_read(v);
	for (;;) {
		if (unlikely(c == u))
			break;
		old = atomic64_cmpxchg(v, c, c + i);
		if (likely(old == c))
			break;
		c = old;
	}
	return c != u;
}

static inline long long atomic64_dec_if_positive(atomic64_t *v)
{
	long 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;
}

#define ATOMIC_OP(op)							\
static inline int atomic_fetch_##op(int i, atomic_t *v)			\
{									\
	return __atomic32_fetch_##op(i, &v->counter);			\
}									\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	(void)__atomic32_fetch_##op(i, &v->counter);			\
}									\
									\
static inline long long atomic64_fetch_##op(long long i, atomic64_t *v)	\
{									\
	return __atomic64_fetch_##op(i, &v->counter);			\
}									\
static inline void atomic64_##op(long long i, atomic64_t *v)		\
{									\
	(void)__atomic64_fetch_##op(i, &v->counter);			\
}

ATOMIC_OP(or)
ATOMIC_OP(and)
ATOMIC_OP(xor)
ATOMIC_OP(add)
ATOMIC_OP(sub)

#undef ATOMIC_OP

#endif /* _ASM_ATOMIC_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 290 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 4.97 KB 0644
atomic_defs.h File 4.66 KB 0644
ax88796.h File 751 B 0644
barrier.h File 720 B 0644
bitops.h File 7.12 KB 0644
bug.h File 1.36 KB 0644
bugs.h File 445 B 0644
busctl-regs.h File 2.02 KB 0644
cache.h File 727 B 0644
cacheflush.h File 3.05 KB 0644
checksum.h File 4.53 KB 0644
cmpxchg.h File 4.56 KB 0644
cpu-irqs.h File 2.59 KB 0644
current.h File 685 B 0644
delay.h File 1.28 KB 0644
div64.h File 31 B 0644
dm9000.h File 1.12 KB 0644
dma-mapping.h File 448 B 0644
dma.h File 3.63 KB 0644
elf.h File 5.18 KB 0644
emergency-restart.h File 149 B 0644
fpu.h File 261 B 0644
ftrace.h File 12 B 0644
futex.h File 416 B 0644
gdb-stub.h File 4.47 KB 0644
gpio-regs.h File 3.64 KB 0644
hardirq.h File 666 B 0644
highmem.h File 4.09 KB 0644
hw_irq.h File 484 B 0644
io.h File 9.75 KB 0644
irc-regs.h File 1.78 KB 0644
irq.h File 760 B 0644
irq_regs.h File 764 B 0644
irqflags.h File 3.71 KB 0644
kdebug.h File 32 B 0644
kmap_types.h File 123 B 0644
linkage.h File 114 B 0644
local.h File 140 B 0644
local64.h File 33 B 0644
math-emu.h File 6.38 KB 0644
mb-regs.h File 6.94 KB 0644
mb86943a.h File 1.84 KB 0644
mb93091-fpga-irqs.h File 1.06 KB 0644
mb93093-fpga-irqs.h File 789 B 0644
mb93493-irqs.h File 1.69 KB 0644
mb93493-regs.h File 12.46 KB 0644
mem-layout.h File 2.21 KB 0644
mmu.h File 1.26 KB 0644
mmu_context.h File 1.38 KB 0644
module.h File 617 B 0644
page.h File 2.08 KB 0644
pci.h File 1.23 KB 0644
percpu.h File 147 B 0644
perf_event.h File 487 B 0644
pgalloc.h File 1.87 KB 0644
pgtable.h File 16.02 KB 0644
processor.h File 2.85 KB 0644
ptrace.h File 1.2 KB 0644
sections.h File 1.1 KB 0644
segment.h File 1.08 KB 0644
serial-regs.h File 1.63 KB 0644
serial.h File 308 B 0644
setup.h File 641 B 0644
shmparam.h File 183 B 0644
signal.h File 141 B 0644
smp.h File 139 B 0644
spinlock.h File 516 B 0644
spr-regs.h File 17.93 KB 0644
string.h File 1.36 KB 0644
switch_to.h File 1.07 KB 0644
syscall.h File 2.73 KB 0644
termios.h File 425 B 0644
thread_info.h File 3.48 KB 0644
timer-regs.h File 3.63 KB 0644
timex.h File 720 B 0644
tlb.h File 615 B 0644
tlbflush.h File 1.88 KB 0644
topology.h File 229 B 0644
types.h File 595 B 0644
uaccess.h File 6.79 KB 0644
ucontext.h File 281 B 0644
unaligned.h File 694 B 0644
unistd.h File 928 B 0644
user.h File 3.29 KB 0644
vga.h File 464 B 0644
virtconvert.h File 1.09 KB 0644
xor.h File 29 B 0644