1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright 2022-2024 Rivos, Inc
6 #ifndef _ASM_CPUFEATURE_H
7 #define _ASM_CPUFEATURE_H
9 #include <linux/bitmap.h>
10 #include <linux/jump_label.h>
11 #include <asm/hwcap.h>
12 #include <asm/alternative-macros.h>
13 #include <asm/errno.h>
16 * These are probed via a device_initcall(), via either the SBI or directly
17 * from the corresponding CSRs.
19 struct riscv_cpuinfo {
20 unsigned long mvendorid;
21 unsigned long marchid;
25 struct riscv_isainfo {
26 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
29 DECLARE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
31 /* Per-cpu ISA extensions. */
32 extern struct riscv_isainfo hart_isa[NR_CPUS];
34 void riscv_user_isa_enable(void);
36 #if defined(CONFIG_RISCV_MISALIGNED)
37 bool check_unaligned_access_emulated_all_cpus(void);
38 void unaligned_emulation_finish(void);
39 bool unaligned_ctl_available(void);
40 DECLARE_PER_CPU(long, misaligned_access_speed);
42 static inline bool unaligned_ctl_available(void)
48 #if defined(CONFIG_RISCV_PROBE_UNALIGNED_ACCESS)
49 DECLARE_STATIC_KEY_FALSE(fast_unaligned_access_speed_key);
51 static __always_inline bool has_fast_unaligned_accesses(void)
53 return static_branch_likely(&fast_unaligned_access_speed_key);
56 static __always_inline bool has_fast_unaligned_accesses(void)
58 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
65 unsigned long riscv_get_elf_hwcap(void);
67 struct riscv_isa_ext_data {
68 const unsigned int id;
71 const unsigned int *subset_ext_ids;
72 const unsigned int subset_ext_size;
75 extern const struct riscv_isa_ext_data riscv_isa_ext[];
76 extern const size_t riscv_isa_ext_count;
77 extern bool riscv_isa_fallback;
79 unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap);
81 bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, unsigned int bit);
82 #define riscv_isa_extension_available(isa_bitmap, ext) \
83 __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_##ext)
85 static __always_inline bool
86 riscv_has_extension_likely(const unsigned long ext)
88 compiletime_assert(ext < RISCV_ISA_EXT_MAX,
89 "ext must be < RISCV_ISA_EXT_MAX");
91 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) {
93 ALTERNATIVE("j %l[l_no]", "nop", 0, %[ext], 1)
99 if (!__riscv_isa_extension_available(NULL, ext))
108 static __always_inline bool
109 riscv_has_extension_unlikely(const unsigned long ext)
111 compiletime_assert(ext < RISCV_ISA_EXT_MAX,
112 "ext must be < RISCV_ISA_EXT_MAX");
114 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) {
116 ALTERNATIVE("nop", "j %l[l_yes]", 0, %[ext], 1)
122 if (__riscv_isa_extension_available(NULL, ext))
131 static __always_inline bool riscv_cpu_has_extension_likely(int cpu, const unsigned long ext)
133 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE) && riscv_has_extension_likely(ext))
136 return __riscv_isa_extension_available(hart_isa[cpu].isa, ext);
139 static __always_inline bool riscv_cpu_has_extension_unlikely(int cpu, const unsigned long ext)
141 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE) && riscv_has_extension_unlikely(ext))
144 return __riscv_isa_extension_available(hart_isa[cpu].isa, ext);