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63 lines
1.4 KiB
63 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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 ([email protected]) |
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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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#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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