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