133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* Copyright 2004-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __ARCH_BLACKFIN_CMPXCHG__
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#define __ARCH_BLACKFIN_CMPXCHG__
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#ifdef CONFIG_SMP
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#include <linux/linkage.h>
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asmlinkage unsigned long __raw_xchg_1_asm(volatile void *ptr, unsigned long value);
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asmlinkage unsigned long __raw_xchg_2_asm(volatile void *ptr, unsigned long value);
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asmlinkage unsigned long __raw_xchg_4_asm(volatile void *ptr, unsigned long value);
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asmlinkage unsigned long __raw_cmpxchg_1_asm(volatile void *ptr,
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unsigned long new, unsigned long old);
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asmlinkage unsigned long __raw_cmpxchg_2_asm(volatile void *ptr,
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unsigned long new, unsigned long old);
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asmlinkage unsigned long __raw_cmpxchg_4_asm(volatile void *ptr,
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unsigned long new, unsigned long old);
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static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
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int size)
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{
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unsigned long tmp;
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switch (size) {
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case 1:
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tmp = __raw_xchg_1_asm(ptr, x);
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break;
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case 2:
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tmp = __raw_xchg_2_asm(ptr, x);
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break;
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case 4:
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tmp = __raw_xchg_4_asm(ptr, x);
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break;
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}
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return tmp;
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}
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/*
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* Atomic compare and exchange. Compare OLD with MEM, if identical,
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* store NEW in MEM. Return the initial value in MEM. Success is
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* indicated by comparing RETURN with OLD.
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*/
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static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
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unsigned long new, int size)
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{
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unsigned long tmp;
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switch (size) {
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case 1:
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tmp = __raw_cmpxchg_1_asm(ptr, new, old);
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break;
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case 2:
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tmp = __raw_cmpxchg_2_asm(ptr, new, old);
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break;
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case 4:
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tmp = __raw_cmpxchg_4_asm(ptr, new, old);
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break;
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}
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return tmp;
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}
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#define cmpxchg(ptr, o, n) \
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((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
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(unsigned long)(n), sizeof(*(ptr))))
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#else /* !CONFIG_SMP */
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#include <mach/blackfin.h>
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#include <asm/irqflags.h>
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struct __xchg_dummy {
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unsigned long a[100];
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};
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#define __xg(x) ((volatile struct __xchg_dummy *)(x))
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static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
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int size)
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{
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unsigned long tmp = 0;
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unsigned long flags;
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flags = hard_local_irq_save();
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switch (size) {
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case 1:
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__asm__ __volatile__
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("%0 = b%2 (z);\n\t"
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"b%2 = %1;\n\t"
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: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
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break;
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case 2:
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__asm__ __volatile__
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("%0 = w%2 (z);\n\t"
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"w%2 = %1;\n\t"
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: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
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break;
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case 4:
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__asm__ __volatile__
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("%0 = %2;\n\t"
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"%2 = %1;\n\t"
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: "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
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break;
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}
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hard_local_irq_restore(flags);
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return tmp;
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}
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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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#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
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#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))
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#endif /* !CONFIG_SMP */
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#define xchg(ptr, x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
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#endif /* __ARCH_BLACKFIN_CMPXCHG__ */
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