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 */ 55