1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright 2022-2024 Rivos, Inc
4 */
5
6 #ifndef _ASM_CPUFEATURE_H
7 #define _ASM_CPUFEATURE_H
8
9 #include <linux/bitmap.h>
10 #include <linux/jump_label.h>
11 #include <linux/workqueue.h>
12 #include <linux/kconfig.h>
13 #include <linux/percpu-defs.h>
14 #include <linux/threads.h>
15 #include <asm/hwcap.h>
16 #include <asm/cpufeature-macros.h>
17
18 /*
19 * These are probed via a device_initcall(), via either the SBI or directly
20 * from the corresponding CSRs.
21 */
22 struct riscv_cpuinfo {
23 unsigned long mvendorid;
24 unsigned long marchid;
25 unsigned long mimpid;
26 };
27
28 struct riscv_isainfo {
29 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
30 };
31
32 DECLARE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
33
34 /* Per-cpu ISA extensions. */
35 extern struct riscv_isainfo hart_isa[NR_CPUS];
36
37 extern u32 thead_vlenb_of;
38
39 void __init riscv_user_isa_enable(void);
40
41 #define _RISCV_ISA_EXT_DATA(_name, _id, _subset_exts, _subset_exts_size, _validate) { \
42 .name = #_name, \
43 .property = #_name, \
44 .id = _id, \
45 .subset_ext_ids = _subset_exts, \
46 .subset_ext_size = _subset_exts_size, \
47 .validate = _validate \
48 }
49
50 #define __RISCV_ISA_EXT_DATA(_name, _id) _RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, NULL)
51
52 #define __RISCV_ISA_EXT_DATA_VALIDATE(_name, _id, _validate) \
53 _RISCV_ISA_EXT_DATA(_name, _id, NULL, 0, _validate)
54
55 /* Used to declare pure "lasso" extension (Zk for instance) */
56 #define __RISCV_ISA_EXT_BUNDLE(_name, _bundled_exts) \
57 _RISCV_ISA_EXT_DATA(_name, RISCV_ISA_EXT_INVALID, _bundled_exts, \
58 ARRAY_SIZE(_bundled_exts), NULL)
59 #define __RISCV_ISA_EXT_BUNDLE_VALIDATE(_name, _bundled_exts, _validate) \
60 _RISCV_ISA_EXT_DATA(_name, RISCV_ISA_EXT_INVALID, _bundled_exts, \
61 ARRAY_SIZE(_bundled_exts), _validate)
62
63 /* Used to declare extensions that are a superset of other extensions (Zvbb for instance) */
64 #define __RISCV_ISA_EXT_SUPERSET(_name, _id, _sub_exts) \
65 _RISCV_ISA_EXT_DATA(_name, _id, _sub_exts, ARRAY_SIZE(_sub_exts), NULL)
66 #define __RISCV_ISA_EXT_SUPERSET_VALIDATE(_name, _id, _sub_exts, _validate) \
67 _RISCV_ISA_EXT_DATA(_name, _id, _sub_exts, ARRAY_SIZE(_sub_exts), _validate)
68
69 bool __init check_unaligned_access_emulated_all_cpus(void);
70 void unaligned_access_init(void);
71 int cpu_online_unaligned_access_init(unsigned int cpu);
72 #if defined(CONFIG_RISCV_SCALAR_MISALIGNED)
73 void unaligned_emulation_finish(void);
74 bool unaligned_ctl_available(void);
75 #else
unaligned_ctl_available(void)76 static inline bool unaligned_ctl_available(void)
77 {
78 return false;
79 }
80 #endif
81
82 #if defined(CONFIG_RISCV_MISALIGNED)
83 DECLARE_PER_CPU(long, misaligned_access_speed);
84 bool misaligned_traps_can_delegate(void);
85 #else
misaligned_traps_can_delegate(void)86 static inline bool misaligned_traps_can_delegate(void)
87 {
88 return false;
89 }
90 #endif
91
92 bool __init check_vector_unaligned_access_emulated_all_cpus(void);
93 #if defined(CONFIG_RISCV_VECTOR_MISALIGNED)
94 void check_vector_unaligned_access_emulated(struct work_struct *work __always_unused);
95 DECLARE_PER_CPU(long, vector_misaligned_access);
96 #endif
97
98 #if defined(CONFIG_RISCV_PROBE_UNALIGNED_ACCESS)
99 DECLARE_STATIC_KEY_FALSE(fast_unaligned_access_speed_key);
100
has_fast_unaligned_accesses(void)101 static __always_inline bool has_fast_unaligned_accesses(void)
102 {
103 return static_branch_likely(&fast_unaligned_access_speed_key);
104 }
105 #else
has_fast_unaligned_accesses(void)106 static __always_inline bool has_fast_unaligned_accesses(void)
107 {
108 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
109 return true;
110 else
111 return false;
112 }
113 #endif
114
115 unsigned long riscv_get_elf_hwcap(void);
116
117 struct riscv_isa_ext_data {
118 const unsigned int id;
119 const char *name;
120 const char *property;
121 const unsigned int *subset_ext_ids;
122 const unsigned int subset_ext_size;
123 int (*validate)(const struct riscv_isa_ext_data *data, const unsigned long *isa_bitmap);
124 };
125
126 extern const struct riscv_isa_ext_data riscv_isa_ext[];
127 extern const size_t riscv_isa_ext_count;
128 extern bool riscv_isa_fallback;
129
130 unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap);
riscv_cpu_has_extension_likely(int cpu,const unsigned long ext)131 static __always_inline bool riscv_cpu_has_extension_likely(int cpu, const unsigned long ext)
132 {
133 compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX");
134
135 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE) &&
136 __riscv_has_extension_likely(STANDARD_EXT, ext))
137 return true;
138
139 return __riscv_isa_extension_available(hart_isa[cpu].isa, ext);
140 }
141
riscv_cpu_has_extension_unlikely(int cpu,const unsigned long ext)142 static __always_inline bool riscv_cpu_has_extension_unlikely(int cpu, const unsigned long ext)
143 {
144 compiletime_assert(ext < RISCV_ISA_EXT_MAX, "ext must be < RISCV_ISA_EXT_MAX");
145
146 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE) &&
147 __riscv_has_extension_unlikely(STANDARD_EXT, ext))
148 return true;
149
150 return __riscv_isa_extension_available(hart_isa[cpu].isa, ext);
151 }
152
153 #endif
154