54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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#ifndef __ASM_CRIS_CMPXCHG__
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#define __ASM_CRIS_CMPXCHG__
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#include <linux/irqflags.h>
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static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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/* since Etrax doesn't have any atomic xchg instructions, we need to disable
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irq's (if enabled) and do it with move.d's */
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unsigned long flags,temp;
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local_irq_save(flags); /* save flags, including irq enable bit and shut off irqs */
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switch (size) {
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case 1:
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*((unsigned char *)&temp) = x;
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x = *(unsigned char *)ptr;
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*(unsigned char *)ptr = *((unsigned char *)&temp);
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break;
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case 2:
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*((unsigned short *)&temp) = x;
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x = *(unsigned short *)ptr;
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*(unsigned short *)ptr = *((unsigned short *)&temp);
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break;
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case 4:
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temp = x;
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x = *(unsigned long *)ptr;
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*(unsigned long *)ptr = temp;
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break;
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}
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local_irq_restore(flags); /* restore irq enable bit */
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return x;
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}
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#define xchg(ptr,x) \
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((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),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), (unsigned long)(o),\
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(unsigned long)(n), sizeof(*(ptr))))
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#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
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#ifndef CONFIG_SMP
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#include <asm-generic/cmpxchg.h>
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#endif
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#endif /* __ASM_CRIS_CMPXCHG__ */
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