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/compiler_types.h>
   8 #include <linux/export.h>
   9 #include <linux/stringify.h>
  10 #include <asm/alternative.h>
  11 #include <asm/cpucaps.h>
  12
  13 #ifdef __ASSEMBLER__
  14
  15 .arch_extension lse
  16
  17 .macro alt_lse, llsc, lse
  18         alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
  19 .endm
  20
  21 #else   /* __ASSEMBLER__ */
  22
  23 __asm__(".arch_extension        lse");
  24
  25 /* Move the ll/sc atomics out-of-line */
  26 #define __LL_SC_INLINE          notrace
  27 #define __LL_SC_PREFIX(x)       __ll_sc_##x
  28 #define __LL_SC_EXPORT(x)       EXPORT_SYMBOL(__LL_SC_PREFIX(x))
  29
  30 /* Macro for constructing calls to out-of-line ll/sc atomics */
  31 #define __LL_SC_CALL(op)        "bl\t" __stringify(__LL_SC_PREFIX(op)) "\n"
  32 #define __LL_SC_CLOBBERS        "x16", "x17", "x30"
  33
  34 /* In-line patching at runtime */
  35 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)                                \
  36         ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS)
  37
  38 #endif  /* __ASSEMBLER__ */
  39 #else   /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  40
  41 #ifdef __ASSEMBLER__
  42
  43 .macro alt_lse, llsc, lse
  44         \llsc
  45 .endm
  46
  47 #else   /* __ASSEMBLER__ */
  48
  49 #define __LL_SC_INLINE          static inline
  50 #define __LL_SC_PREFIX(x)       x
  51 #define __LL_SC_EXPORT(x)
  52
  53 #define ARM64_LSE_ATOMIC_INSN(llsc, lse)        llsc
  54
  55 #endif  /* __ASSEMBLER__ */
  56 #endif  /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
  57 #endif  /* __ASM_LSE_H */