116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
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/* MN10300 Atomic xchg/cmpxchg operations
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_CMPXCHG_H
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#define _ASM_CMPXCHG_H
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#include <asm/irqflags.h>
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#ifdef CONFIG_SMP
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#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
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static inline
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unsigned long __xchg(volatile unsigned long *m, unsigned long val)
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{
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unsigned long status;
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unsigned long oldval;
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asm volatile(
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"1: mov %4,(_AAR,%3) \n"
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" mov (_ADR,%3),%1 \n"
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" mov %5,(_ADR,%3) \n"
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" mov (_ADR,%3),%0 \n" /* flush */
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" mov (_ASR,%3),%0 \n"
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" or %0,%0 \n"
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" bne 1b \n"
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: "=&r"(status), "=&r"(oldval), "=m"(*m)
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: "a"(ATOMIC_OPS_BASE_ADDR), "r"(m), "r"(val)
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: "memory", "cc");
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return oldval;
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}
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static inline unsigned long __cmpxchg(volatile unsigned long *m,
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unsigned long old, unsigned long new)
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{
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unsigned long status;
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unsigned long oldval;
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asm volatile(
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"1: mov %4,(_AAR,%3) \n"
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" mov (_ADR,%3),%1 \n"
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" cmp %5,%1 \n"
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" bne 2f \n"
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" mov %6,(_ADR,%3) \n"
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"2: mov (_ADR,%3),%0 \n" /* flush */
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" mov (_ASR,%3),%0 \n"
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" or %0,%0 \n"
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" bne 1b \n"
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: "=&r"(status), "=&r"(oldval), "=m"(*m)
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: "a"(ATOMIC_OPS_BASE_ADDR), "r"(m),
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"r"(old), "r"(new)
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: "memory", "cc");
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return oldval;
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}
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#else /* CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT */
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#error "No SMP atomic operation support!"
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#endif /* CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT */
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#else /* CONFIG_SMP */
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/*
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* Emulate xchg for non-SMP MN10300
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*/
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struct __xchg_dummy { unsigned long a[100]; };
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#define __xg(x) ((struct __xchg_dummy *)(x))
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static inline
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unsigned long __xchg(volatile unsigned long *m, unsigned long val)
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{
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unsigned long oldval;
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unsigned long flags;
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flags = arch_local_cli_save();
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oldval = *m;
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*m = val;
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arch_local_irq_restore(flags);
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return oldval;
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}
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/*
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* Emulate cmpxchg for non-SMP MN10300
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*/
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static inline unsigned long __cmpxchg(volatile unsigned long *m,
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unsigned long old, unsigned long new)
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{
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unsigned long oldval;
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unsigned long flags;
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flags = arch_local_cli_save();
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oldval = *m;
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if (oldval == old)
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*m = new;
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arch_local_irq_restore(flags);
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return oldval;
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}
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#endif /* CONFIG_SMP */
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#define xchg(ptr, v) \
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((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr), \
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(unsigned long)(v)))
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#define cmpxchg(ptr, o, n) \
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((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
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(unsigned long)(o), \
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(unsigned long)(n)))
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#endif /* _ASM_CMPXCHG_H */
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