arch/sh/include/asm/cmpxchg-llsc.h

   1 #ifndef __ASM_SH_CMPXCHG_LLSC_H
   2 #define __ASM_SH_CMPXCHG_LLSC_H
   3
   4 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   5 {
   6         unsigned long retval;
   7         unsigned long tmp;
   8
   9         __asm__ __volatile__ (
  10                 "1:                                     \n\t"
  11                 "movli.l        @%2, %0 ! xchg_u32      \n\t"
  12                 "mov            %0, %1                  \n\t"
  13                 "mov            %3, %0                  \n\t"
  14                 "movco.l        %0, @%2                 \n\t"
  15                 "bf             1b                      \n\t"
  16                 "synco                                  \n\t"
  17                 : "=&z"(tmp), "=&r" (retval)
  18                 : "r" (m), "r" (val)
  19                 : "t", "memory"
  20         );
  21
  22         return retval;
  23 }
  24
  25 static inline unsigned long
  26 __cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
  27 {
  28         unsigned long retval;
  29         unsigned long tmp;
  30
  31         __asm__ __volatile__ (
  32                 "1:                                             \n\t"
  33                 "movli.l        @%2, %0 ! __cmpxchg_u32         \n\t"
  34                 "mov            %0, %1                          \n\t"
  35                 "cmp/eq         %1, %3                          \n\t"
  36                 "bf             2f                              \n\t"
  37                 "mov            %4, %0                          \n\t"
  38                 "2:                                             \n\t"
  39                 "movco.l        %0, @%2                         \n\t"
  40                 "bf             1b                              \n\t"
  41                 "synco                                          \n\t"
  42                 : "=&z" (tmp), "=&r" (retval)
  43                 : "r" (m), "r" (old), "r" (new)
  44                 : "t", "memory"
  45         );
  46
  47         return retval;
  48 }
  49
  50 #include <asm/cmpxchg-xchg.h>
  51
  52 #endif /* __ASM_SH_CMPXCHG_LLSC_H */