mirror of https://gitee.com/openkylin/linux.git
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_CMPXCHG_H
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#define _ASM_C6X_CMPXCHG_H
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#include <linux/irqflags.h>
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/*
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* Misc. functions
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*/
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static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
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{
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unsigned int tmp;
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unsigned long flags;
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local_irq_save(flags);
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switch (size) {
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case 1:
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tmp = 0;
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tmp = *((unsigned char *) ptr);
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*((unsigned char *) ptr) = (unsigned char) x;
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break;
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case 2:
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tmp = 0;
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tmp = *((unsigned short *) ptr);
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*((unsigned short *) ptr) = x;
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break;
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case 4:
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tmp = 0;
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tmp = *((unsigned int *) ptr);
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*((unsigned int *) ptr) = x;
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break;
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}
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local_irq_restore(flags);
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return tmp;
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}
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#define xchg(ptr, x) \
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((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
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sizeof(*(ptr))))
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#define tas(ptr) xchg((ptr), 1)
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#include <asm-generic/cmpxchg-local.h>
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/*
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* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
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* them available.
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*/
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#define cmpxchg_local(ptr, o, n) \
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((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
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(unsigned long)(o), \
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(unsigned long)(n), \
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sizeof(*(ptr))))
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
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#include <asm-generic/cmpxchg.h>
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#endif /* _ASM_C6X_CMPXCHG_H */
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