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Release 4.14 arch/mn10300/include/asm/cmpxchg.h

/* 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; }

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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; }

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#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; }

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David Howells49100.00%1100.00%
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/* * 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; }

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David Howells59100.00%1100.00%
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#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 */

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David Howells257100.00%1100.00%
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