LXR linux/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
   9#ifdef __ASSEMBLER__
  10
  11.arch_extension lse
  12
  13.macro alt_lse, llsc, lse
  14        alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
  15.endm
  16
  17#else   /* __ASSEMBLER__ */
  18
  19__asm__(".arch_extension        lse");
  20
  21/* Move the ll/sc atomics out-of-line */
  22#define __LL_SC_INLINE          notrace
  23#define __LL_SC_PREFIX(x)       __ll_sc_##x
  24#define __LL_SC_EXPORT(x)       EXPORT_SYMBOL(__LL_SC_PREFIX(x))
  25
  26/* Macro for constructing calls to out-of-line ll/sc atomics */
  27#define __LL_SC_CALL(op)        "bl\t" __stringify(__LL_SC_PREFIX(op)) "\n"
  28#define __LL_SC_CLOBBERS        "x16", "x17", "x30"
  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 */
  54