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66 lines
1.5 KiB
66 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ARCH_H8300_CMPXCHG__ |
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#define __ARCH_H8300_CMPXCHG__ |
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#include <linux/irqflags.h> |
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#define xchg(ptr, x) \ |
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((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \ |
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sizeof(*(ptr)))) |
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struct __xchg_dummy { unsigned long a[100]; }; |
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#define __xg(x) ((volatile struct __xchg_dummy *)(x)) |
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static inline unsigned long __xchg(unsigned long x, |
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volatile void *ptr, int size) |
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{ |
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unsigned long tmp, 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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__asm__ __volatile__ |
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("mov.b %2,%0\n\t" |
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"mov.b %1,%2" |
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); |
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break; |
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case 2: |
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__asm__ __volatile__ |
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("mov.w %2,%0\n\t" |
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"mov.w %1,%2" |
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); |
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break; |
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case 4: |
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__asm__ __volatile__ |
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("mov.l %2,%0\n\t" |
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"mov.l %1,%2" |
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: "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); |
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break; |
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default: |
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tmp = 0; |
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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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#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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#ifndef CONFIG_SMP |
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#include <asm-generic/cmpxchg.h> |
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#endif |
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
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#endif /* __ARCH_H8300_CMPXCHG__ */
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