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

INCLUDED FROM

DEFINITIONS

1. __xchg

   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__ */