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/* MN10300 Atomic xchg/cmpxchg 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_CMPXCHG_H
#define _ASM_CMPXCHG_H

#include <asm/irqflags.h>

#ifdef CONFIG_SMP
#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
static inline
unsigned long __xchg(volatile unsigned long *m, unsigned long val)
{
	unsigned long status;
	unsigned long oldval;

	asm volatile(
		"1:	mov	%4,(_AAR,%3)	\n"
		"	mov	(_ADR,%3),%1	\n"
		"	mov	%5,(_ADR,%3)	\n"
		"	mov	(_ADR,%3),%0	\n"	/* flush */
		"	mov	(_ASR,%3),%0	\n"
		"	or	%0,%0		\n"
		"	bne	1b		\n"
		: "=&r"(status), "=&r"(oldval), "=m"(*m)
		: "a"(ATOMIC_OPS_BASE_ADDR), "r"(m), "r"(val)
		: "memory", "cc");

	return oldval;
}

static inline unsigned long __cmpxchg(volatile unsigned long *m,
				      unsigned long old, unsigned long new)
{
	unsigned long status;
	unsigned long oldval;

	asm volatile(
		"1:	mov	%4,(_AAR,%3)	\n"
		"	mov	(_ADR,%3),%1	\n"
		"	cmp	%5,%1		\n"
		"	bne	2f		\n"
		"	mov	%6,(_ADR,%3)	\n"
		"2:	mov	(_ADR,%3),%0	\n"	/* flush */
		"	mov	(_ASR,%3),%0	\n"
		"	or	%0,%0		\n"
		"	bne	1b		\n"
		: "=&r"(status), "=&r"(oldval), "=m"(*m)
		: "a"(ATOMIC_OPS_BASE_ADDR), "r"(m),
		  "r"(old), "r"(new)
		: "memory", "cc");

	return oldval;
}
#else  /* CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT */
#error "No SMP atomic operation support!"
#endif /* CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT */

#else  /* CONFIG_SMP */

/*
 * Emulate xchg for non-SMP MN10300
 */
struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((struct __xchg_dummy *)(x))

static inline
unsigned long __xchg(volatile unsigned long *m, unsigned long val)
{
	unsigned long oldval;
	unsigned long flags;

	flags = arch_local_cli_save();
	oldval = *m;
	*m = val;
	arch_local_irq_restore(flags);
	return oldval;
}

/*
 * Emulate cmpxchg for non-SMP MN10300
 */
static inline unsigned long __cmpxchg(volatile unsigned long *m,
				      unsigned long old, unsigned long new)
{
	unsigned long oldval;
	unsigned long flags;

	flags = arch_local_cli_save();
	oldval = *m;
	if (oldval == old)
		*m = new;
	arch_local_irq_restore(flags);
	return oldval;
}

#endif /* CONFIG_SMP */

#define xchg(ptr, v)						\
	((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),	\
				     (unsigned long)(v)))

#define cmpxchg(ptr, o, n)					\
	((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
					(unsigned long)(o),	\
					(unsigned long)(n)))

#endif /* _ASM_CMPXCHG_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