arch/alpha/include/asm/cmpxchg.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ALPHA_CMPXCHG_H
   3 #define _ALPHA_CMPXCHG_H
   4
   5 /*
   6  * Atomic exchange routines.
   7  */
   8
   9 #define __ASM__MB
  10 #define ____xchg(type, args...)         __xchg ## type ## _local(args)
  11 #define ____cmpxchg(type, args...)      __cmpxchg ## type ## _local(args)
  12 #include <asm/xchg.h>
  13
  14 #define xchg_local(ptr, x)                                              \
  15 ({                                                                      \
  16         __typeof__(*(ptr)) _x_ = (x);                                   \
  17         (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,    \
  18                                        sizeof(*(ptr)));                 \
  19 })
  20
  21 #define cmpxchg_local(ptr, o, n)                                        \
  22 ({                                                                      \
  23         __typeof__(*(ptr)) _o_ = (o);                                   \
  24         __typeof__(*(ptr)) _n_ = (n);                                   \
  25         (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
  26                                           (unsigned long)_n_,           \
  27                                           sizeof(*(ptr)));              \
  28 })
  29
  30 #define cmpxchg64_local(ptr, o, n)                                      \
  31 ({                                                                      \
  32         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  33         cmpxchg_local((ptr), (o), (n));                                 \
  34 })
  35
  36 #ifdef CONFIG_SMP
  37 #undef __ASM__MB
  38 #define __ASM__MB       "\tmb\n"
  39 #endif
  40 #undef ____xchg
  41 #undef ____cmpxchg
  42 #define ____xchg(type, args...)         __xchg ##type(args)
  43 #define ____cmpxchg(type, args...)      __cmpxchg ##type(args)
  44 #include <asm/xchg.h>
  45
  46 #define xchg(ptr, x)                                                    \
  47 ({                                                                      \
  48         __typeof__(*(ptr)) _x_ = (x);                                   \
  49         (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_,          \
  50                                  sizeof(*(ptr)));                       \
  51 })
  52
  53 #define cmpxchg(ptr, o, n)                                              \
  54 ({                                                                      \
  55         __typeof__(*(ptr)) _o_ = (o);                                   \
  56         __typeof__(*(ptr)) _n_ = (n);                                   \
  57         (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,       \
  58                                     (unsigned long)_n_, sizeof(*(ptr)));\
  59 })
  60
  61 #define cmpxchg64(ptr, o, n)                                            \
  62 ({                                                                      \
  63         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  64         cmpxchg((ptr), (o), (n));                                       \
  65 })
  66
  67 #undef __ASM__MB
  68 #undef ____cmpxchg
  69
  70 #endif /* _ALPHA_CMPXCHG_H */