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Linux/arch/h8300/include/asm/cmpxchg.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __ARCH_H8300_CMPXCHG__
  3 #define __ARCH_H8300_CMPXCHG__
  4 
  5 #include <linux/irqflags.h>
  6 
  7 #define xchg(ptr, x) \
  8         ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
  9                                     sizeof(*(ptr))))
 10 
 11 struct __xchg_dummy { unsigned long a[100]; };
 12 #define __xg(x) ((volatile struct __xchg_dummy *)(x))
 13 
 14 static inline unsigned long __xchg(unsigned long x,
 15                                    volatile void *ptr, int size)
 16 {
 17         unsigned long tmp, flags;
 18 
 19         local_irq_save(flags);
 20 
 21         switch (size) {
 22         case 1:
 23                 __asm__ __volatile__
 24                         ("mov.b %2,%0\n\t"
 25                          "mov.b %1,%2"
 26                          : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
 27                 break;
 28         case 2:
 29                 __asm__ __volatile__
 30                         ("mov.w %2,%0\n\t"
 31                          "mov.w %1,%2"
 32                          : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
 33                 break;
 34         case 4:
 35                 __asm__ __volatile__
 36                         ("mov.l %2,%0\n\t"
 37                          "mov.l %1,%2"
 38                          : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
 39                 break;
 40         default:
 41                 tmp = 0;
 42         }
 43         local_irq_restore(flags);
 44         return tmp;
 45 }
 46 
 47 #include <asm-generic/cmpxchg-local.h>
 48 
 49 /*
 50  * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 51  * them available.
 52  */
 53 #define cmpxchg_local(ptr, o, n)                                         \
 54         ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),              \
 55                                                      (unsigned long)(o), \
 56                                                      (unsigned long)(n), \
 57                                                      sizeof(*(ptr))))
 58 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 59 
 60 #ifndef CONFIG_SMP
 61 #include <asm-generic/cmpxchg.h>
 62 #endif
 63 
 64 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 65 
 66 #endif /* __ARCH_H8300_CMPXCHG__ */
 67 

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