arch/arm64/include/asm/lse.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_LSE_H
   3 #define __ASM_LSE_H
   4
   5 #if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
   6
   7 #include <linux/stringify.h>
   8 #include <asm/alternative.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          notrace
  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 #define __LL_SC_CLOBBERS        "x16", "x17", "x30"
  30
  31 /* In-line patching at runtime */
  32 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)                                \
  33         ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS)
  34
  35 #endif  /* __ASSEMBLER__ */
  36 #else   /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  37
  38 #ifdef __ASSEMBLER__
  39
  40 .macro alt_lse, llsc, lse
  41         \llsc
  42 .endm
  43
  44 #else   /* __ASSEMBLER__ */
  45
  46 #define __LL_SC_INLINE          static inline
  47 #define __LL_SC_PREFIX(x)       x
  48 #define __LL_SC_EXPORT(x)
  49
  50 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)        llsc
  51
  52 #endif  /* __ASSEMBLER__ */
  53 #endif  /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  54 #endif  /* __ASM_LSE_H */