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

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  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 */
 54 

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