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 */ 58
