arch/arm64/include/asm/lse.h

   1 #ifndef __ASM_LSE_H
   2 #define __ASM_LSE_H
   3
   4 #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
   5
   6 #include <linux/stringify.h>
   7 #include <asm/alternative.h>
   8 #include <asm/cpufeature.h>
   9
  10 #ifdef __ASSEMBLER__
  11
  12 .arch_extension lse
  13
  14 .macro alt_lse, llsc, lse
  15         alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
  16 .endm
  17
  18 #else   /* __ASSEMBLER__ */
  19
  20 __asm__(".arch_extension        lse");
  21
  22 /* Move the ll/sc atomics out-of-line */
  23 #define __LL_SC_INLINE
  24 #define __LL_SC_PREFIX(x)       __ll_sc_##x
  25 #define __LL_SC_EXPORT(x)       EXPORT_SYMBOL(__LL_SC_PREFIX(x))
  26
  27 /* Macro for constructing calls to out-of-line ll/sc atomics */
  28 #define __LL_SC_CALL(op)        "bl\t" __stringify(__LL_SC_PREFIX(op)) "\n"
  29
  30 /* In-line patching at runtime */
  31 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)                                \
  32         ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS)
  33
  34 #endif  /* __ASSEMBLER__ */
  35 #else   /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  36
  37 #ifdef __ASSEMBLER__
  38
  39 .macro alt_lse, llsc, lse
  40         \llsc
  41 .endm
  42
  43 #else   /* __ASSEMBLER__ */
  44
  45 #define __LL_SC_INLINE          static inline
  46 #define __LL_SC_PREFIX(x)       x
  47 #define __LL_SC_EXPORT(x)
  48
  49 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)        llsc
  50
  51 #endif  /* __ASSEMBLER__ */
  52 #endif  /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  53 #endif  /* __ASM_LSE_H */