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        @%1, %0 ! xchg_u32      \n\t"
  12                 "mov            %0, %2                  \n\t"
  13                 "mov            %4, %0                  \n\t"
  14                 "movco.l        %0, @%1                 \n\t"
  15                 "bf             1b                      \n\t"
  16                 "synco                                  \n\t"
  17                 : "=&z"(tmp), "=r" (m), "=&r" (retval)
  18                 : "1" (m), "r" (val)
  19                 : "t", "memory"
  20         );
  21
  22         return retval;
  23 }
  24
  25 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  26 {
  27         unsigned long retval;
  28         unsigned long tmp;
  29
  30         __asm__ __volatile__ (
  31                 "1:                                     \n\t"
  32                 "movli.l        @%1, %0 ! xchg_u8       \n\t"
  33                 "mov            %0, %2                  \n\t"
  34                 "mov            %4, %0                  \n\t"
  35                 "movco.l        %0, @%1                 \n\t"
  36                 "bf             1b                      \n\t"
  37                 "synco                                  \n\t"
  38                 : "=&z"(tmp), "=r" (m), "=&r" (retval)
  39                 : "1" (m), "r" (val & 0xff)
  40                 : "t", "memory"
  41         );
  42
  43         return retval;
  44 }
  45
  46 static inline unsigned long
  47 __cmpxchg_u32(volatile int *m, unsigned long old, unsigned long new)
  48 {
  49         unsigned long retval;
  50         unsigned long tmp;
  51
  52         __asm__ __volatile__ (
  53                 "1:                                             \n\t"
  54                 "movli.l        @%1, %0 ! __cmpxchg_u32         \n\t"
  55                 "mov            %0, %2                          \n\t"
  56                 "cmp/eq         %2, %4                          \n\t"
  57                 "bf             2f                              \n\t"
  58                 "mov            %5, %0                          \n\t"
  59                 "2:                                             \n\t"
  60                 "movco.l        %0, @%1                         \n\t"
  61                 "bf             1b                              \n\t"
  62                 "synco                                          \n\t"
  63                 : "=&z" (tmp), "=r" (m), "=&r" (retval)
  64                 : "1" (m), "r" (old), "r" (new)
  65                 : "t", "memory"
  66         );
  67
  68         return retval;
  69 }
  70
  71 #endif /* __ASM_SH_CMPXCHG_LLSC_H */