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/* MN10300 Atomic counter operations
 *
 * 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_ATOMIC_H
#define _ASM_ATOMIC_H

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

#ifndef CONFIG_SMP
#include <asm-generic/atomic.h>
#else

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

#define ATOMIC_INIT(i)	{ (i) }

#ifdef __KERNEL__

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

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

#define ATOMIC_OP(op)							\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	int retval, status;						\
									\
	asm volatile(							\
		"1:	mov	%4,(_AAR,%3)	\n"			\
		"	mov	(_ADR,%3),%1	\n"			\
		"	" #op "	%5,%1		\n"			\
		"	mov	%1,(_ADR,%3)	\n"			\
		"	mov	(_ADR,%3),%0	\n"	/* flush */	\
		"	mov	(_ASR,%3),%0	\n"			\
		"	or	%0,%0		\n"			\
		"	bne	1b		\n"			\
		: "=&r"(status), "=&r"(retval), "=m"(v->counter)	\
		: "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i)	\
		: "memory", "cc");					\
}

#define ATOMIC_OP_RETURN(op)						\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	int retval, status;						\
									\
	asm volatile(							\
		"1:	mov	%4,(_AAR,%3)	\n"			\
		"	mov	(_ADR,%3),%1	\n"			\
		"	" #op "	%5,%1		\n"			\
		"	mov	%1,(_ADR,%3)	\n"			\
		"	mov	(_ADR,%3),%0	\n"	/* flush */	\
		"	mov	(_ASR,%3),%0	\n"			\
		"	or	%0,%0		\n"			\
		"	bne	1b		\n"			\
		: "=&r"(status), "=&r"(retval), "=m"(v->counter)	\
		: "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i)	\
		: "memory", "cc");					\
	return retval;							\
}

#define ATOMIC_FETCH_OP(op)						\
static inline int atomic_fetch_##op(int i, atomic_t *v)			\
{									\
	int retval, status;						\
									\
	asm volatile(							\
		"1:	mov	%4,(_AAR,%3)	\n"			\
		"	mov	(_ADR,%3),%1	\n"			\
		"	mov	%1,%0		\n"			\
		"	" #op "	%5,%0		\n"			\
		"	mov	%0,(_ADR,%3)	\n"			\
		"	mov	(_ADR,%3),%0	\n"	/* flush */	\
		"	mov	(_ASR,%3),%0	\n"			\
		"	or	%0,%0		\n"			\
		"	bne	1b		\n"			\
		: "=&r"(status), "=&r"(retval), "=m"(v->counter)	\
		: "a"(ATOMIC_OPS_BASE_ADDR), "r"(&v->counter), "r"(i)	\
		: "memory", "cc");					\
	return retval;							\
}

#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)

ATOMIC_OPS(add)
ATOMIC_OPS(sub)

#undef ATOMIC_OPS
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)

ATOMIC_OPS(and)
ATOMIC_OPS(or)
ATOMIC_OPS(xor)

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

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_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_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v)		(atomic_add_return(1, (v)) == 0)

#define __atomic_add_unless(v, a, u)				\
({								\
	int c, old;						\
	c = atomic_read(v);					\
	while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
		c = old;					\
	c;							\
})

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

#endif /* __KERNEL__ */
#endif /* CONFIG_SMP */
#endif /* _ASM_ATOMIC_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 314 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 4.02 KB 0644
bitops.h File 5.42 KB 0644
bug.h File 864 B 0644
bugs.h File 561 B 0644
busctl-regs.h File 7.8 KB 0644
cache.h File 2.06 KB 0644
cacheflush.h File 7.6 KB 0644
checksum.h File 2.09 KB 0644
cmpxchg.h File 2.65 KB 0644
cpu-regs.h File 16.61 KB 0644
current.h File 922 B 0644
debugger.h File 1.2 KB 0644
delay.h File 597 B 0644
div64.h File 3.21 KB 0644
dma-mapping.h File 636 B 0644
dma.h File 3.09 KB 0644
dmactl-regs.h File 532 B 0644
elf.h File 4.49 KB 0644
emergency-restart.h File 43 B 0644
exceptions.h File 4.74 KB 0644
fpu.h File 3.57 KB 0644
frame.inc File 2.37 KB 0644
ftrace.h File 12 B 0644
futex.h File 31 B 0644
gdb-stub.h File 5.42 KB 0644
hardirq.h File 1.68 KB 0644
highmem.h File 3.01 KB 0644
hw_irq.h File 483 B 0644
intctl-regs.h File 2.26 KB 0644
io.h File 7.67 KB 0644
irq.h File 1.11 KB 0644
irq_regs.h File 751 B 0644
irqflags.h File 4.05 KB 0644
kdebug.h File 561 B 0644
kgdb.h File 1.7 KB 0644
kmap_types.h File 160 B 0644
kprobes.h File 1.59 KB 0644
linkage.h File 593 B 0644
local.h File 31 B 0644
local64.h File 33 B 0644
mc146818rtc.h File 26 B 0644
mmu.h File 434 B 0644
mmu_context.h File 4.44 KB 0644
module.h File 677 B 0644
nmi.h File 500 B 0644
page.h File 3.63 KB 0644
page_offset.h File 302 B 0644
pci.h File 2.17 KB 0644
percpu.h File 32 B 0644
pgalloc.h File 1.49 KB 0644
pgtable.h File 15.68 KB 0644
pio-regs.h File 7.53 KB 0644
processor.h File 4.12 KB 0644
ptrace.h File 805 B 0644
reset-regs.h File 1.8 KB 0644
rtc-regs.h File 3.57 KB 0644
rtc.h File 692 B 0644
rwlock.h File 2.98 KB 0644
serial-regs.h File 8.85 KB 0644
serial.h File 1.02 KB 0644
setup.h File 574 B 0644
shmparam.h File 182 B 0644
signal.h File 888 B 0644
smp.h File 3.06 KB 0644
smsc911x.h File 27 B 0644
spinlock.h File 3.84 KB 0644
spinlock_types.h File 445 B 0644
string.h File 1.03 KB 0644
switch_to.h File 1.49 KB 0644
syscall.h File 2.38 KB 0644
termios.h File 387 B 0644
thread_info.h File 4.36 KB 0644
timer-regs.h File 20.72 KB 0644
timex.h File 843 B 0644
tlb.h File 941 B 0644
tlbflush.h File 3.45 KB 0644
topology.h File 34 B 0644
types.h File 620 B 0644
uaccess.h File 7.78 KB 0644
ucontext.h File 673 B 0644
unaligned.h File 678 B 0644
unistd.h File 1.34 KB 0644
user.h File 1.91 KB 0644
vga.h File 471 B 0644
xor.h File 29 B 0644