| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 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> |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 8 | #include <asm/alternative.h> |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 9 | |
| Will Deacon | 084f903 | 2015-02-12 04:17:37 +0000 | [diff] [blame] | 10 | #ifdef __ASSEMBLER__ |
| 11 | |
| 12 | .arch_extension lse |
| 13 | |
| 14 | .macro alt_lse, llsc, lse |
| Will Deacon | c739dc8 | 2015-07-27 14:11:55 +0100 | [diff] [blame] | 15 | alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS |
| Will Deacon | 084f903 | 2015-02-12 04:17:37 +0000 | [diff] [blame] | 16 | .endm |
| 17 | |
| 18 | #else /* __ASSEMBLER__ */ |
| 19 | |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 20 | __asm__(".arch_extension lse"); |
| 21 | |
| 22 | /* Move the ll/sc atomics out-of-line */ |
| Pratyush Anand | b7eed6d | 2017-02-06 19:46:22 +0530 | [diff] [blame] | 23 | #define __LL_SC_INLINE notrace |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 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" |
| Ard Biesheuvel | 5be8b70 | 2016-02-25 20:48:53 +0100 | [diff] [blame] | 29 | #define __LL_SC_CLOBBERS "x16", "x17", "x30" |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 30 | |
| 31 | /* In-line patching at runtime */ |
| 32 | #define ARM64_LSE_ATOMIC_INSN(llsc, lse) \ |
| Will Deacon | c739dc8 | 2015-07-27 14:11:55 +0100 | [diff] [blame] | 33 | ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS) |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 34 | |
| Will Deacon | 084f903 | 2015-02-12 04:17:37 +0000 | [diff] [blame] | 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__ */ |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 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 | |
| Will Deacon | 084f903 | 2015-02-12 04:17:37 +0000 | [diff] [blame] | 52 | #endif /* __ASSEMBLER__ */ |
| Will Deacon | c09d6a0 | 2015-02-03 16:14:13 +0000 | [diff] [blame] | 53 | #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */ |
| 54 | #endif /* __ASM_LSE_H */ |