| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 */ |