1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright 2022-2024 Rivos, Inc 4 */ 5 6 #ifndef _ASM_CPUFEATURE_MACROS_H 7 #define _ASM_CPUFEATURE_MACROS_H 8 9 #include <asm/hwcap.h> 10 #include <asm/alternative-macros.h> 11 12 #define STANDARD_EXT 0 13 14 bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, unsigned int bit); 15 #define riscv_isa_extension_available(isa_bitmap, ext) \ 16 __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_##ext) 17 18 static __always_inline bool __riscv_has_extension_likely(const unsigned long vendor, 19 const unsigned long ext) 20 { 21 asm goto(ALTERNATIVE("j %l[l_no]", "nop", %[vendor], %[ext], 1) 22 : 23 : [vendor] "i" (vendor), [ext] "i" (ext) 24 : 25 : l_no); 26 27 return true; 28 l_no: 29 return false; 30 } 31 32 static __always_inline bool __riscv_has_extension_unlikely(const unsigned long vendor, 33 const unsigned long ext) 34 { 35 asm goto(ALTERNATIVE("nop", "j %l[l_yes]", %[vendor], %[ext], 1) 36 : 37 : [vendor] "i" (vendor), [ext] "i" (ext) 38 : 39 : l_yes); 40 41 return false; 42 l_yes: 43 return true; 44 } 45 46 static __always_inline bool riscv_has_extension_unlikely(const unsigned long ext) 47 { 48 compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX"); 49 50 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) 51 return __riscv_has_extension_unlikely(STANDARD_EXT, ext); 52 53 return __riscv_isa_extension_available(NULL, ext); 54 } 55 56 static __always_inline bool riscv_has_extension_likely(const unsigned long ext) 57 { 58 compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX"); 59 60 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) 61 return __riscv_has_extension_likely(STANDARD_EXT, ext); 62 63 return __riscv_isa_extension_available(NULL, ext); 64 } 65 66 #endif /* _ASM_CPUFEATURE_MACROS_H */ 67