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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_CMPXCHG_LLSC_H
   3 #define __ASM_SH_CMPXCHG_LLSC_H
   4
   5 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   6 {
   7         unsigned long retval;
   8         unsigned long tmp;
   9
  10         __asm__ __volatile__ (
  11                 "1:                                     \n\t"
  12                 "movli.l        @%2, %0 ! xchg_u32      \n\t"
  13                 "mov            %0, %1                  \n\t"
  14                 "mov            %3, %0                  \n\t"
  15                 "movco.l        %0, @%2                 \n\t"
  16                 "bf             1b                      \n\t"
  17                 "synco                                  \n\t"
  18                 : "=&z"(tmp), "=&r" (retval)
  19                 : "r" (m), "r" (val)
  20                 : "t", "memory"
  21         );
  22
  23         return retval;
  24 }
  25
  26 static inline unsigned long
  27 __cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
  28 {
  29         unsigned long retval;
  30         unsigned long tmp;
  31
  32         __asm__ __volatile__ (
  33                 "1:                                             \n\t"
  34                 "movli.l        @%2, %0 ! __cmpxchg_u32         \n\t"
  35                 "mov            %0, %1                          \n\t"
  36                 "cmp/eq         %1, %3                          \n\t"
  37                 "bf             2f                              \n\t"
  38                 "mov            %4, %0                          \n\t"
  39                 "2:                                             \n\t"
  40                 "movco.l        %0, @%2                         \n\t"
  41                 "bf             1b                              \n\t"
  42                 "synco                                          \n\t"
  43                 : "=&z" (tmp), "=&r" (retval)
  44                 : "r" (m), "r" (old), "r" (new)
  45                 : "t", "memory"
  46         );
  47
  48         return retval;
  49 }
  50
  51 #include <asm/cmpxchg-xchg.h>
  52
  53 #endif /* __ASM_SH_CMPXCHG_LLSC_H */