1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copied from arch/arm64/include/asm/hwcap.h
4 *
5 * Copyright (C) 2012 ARM Ltd.
6 * Copyright (C) 2017 SiFive
7 */
8 #ifndef _ASM_RISCV_HWCAP_H
9 #define _ASM_RISCV_HWCAP_H
10
11 #include <asm/alternative-macros.h>
12 #include <asm/errno.h>
13 #include <linux/bits.h>
14 #include <uapi/asm/hwcap.h>
15
16 #define RISCV_ISA_EXT_a ('a' - 'a')
17 #define RISCV_ISA_EXT_b ('b' - 'a')
18 #define RISCV_ISA_EXT_c ('c' - 'a')
19 #define RISCV_ISA_EXT_d ('d' - 'a')
20 #define RISCV_ISA_EXT_f ('f' - 'a')
21 #define RISCV_ISA_EXT_h ('h' - 'a')
22 #define RISCV_ISA_EXT_i ('i' - 'a')
23 #define RISCV_ISA_EXT_j ('j' - 'a')
24 #define RISCV_ISA_EXT_k ('k' - 'a')
25 #define RISCV_ISA_EXT_m ('m' - 'a')
26 #define RISCV_ISA_EXT_p ('p' - 'a')
27 #define RISCV_ISA_EXT_q ('q' - 'a')
28 #define RISCV_ISA_EXT_s ('s' - 'a')
29 #define RISCV_ISA_EXT_u ('u' - 'a')
30 #define RISCV_ISA_EXT_v ('v' - 'a')
31
32 /*
33 * These macros represent the logical IDs of each multi-letter RISC-V ISA
34 * extension and are used in the ISA bitmap. The logical IDs start from
35 * RISCV_ISA_EXT_BASE, which allows the 0-25 range to be reserved for single
36 * letter extensions. The maximum, RISCV_ISA_EXT_MAX, is defined in order
37 * to allocate the bitmap and may be increased when necessary.
38 *
39 * New extensions should just be added to the bottom, rather than added
40 * alphabetically, in order to avoid unnecessary shuffling.
41 */
42 #define RISCV_ISA_EXT_BASE 26
43
44 #define RISCV_ISA_EXT_SSCOFPMF 26
45 #define RISCV_ISA_EXT_SSTC 27
46 #define RISCV_ISA_EXT_SVINVAL 28
47 #define RISCV_ISA_EXT_SVPBMT 29
48 #define RISCV_ISA_EXT_ZBB 30
49 #define RISCV_ISA_EXT_ZICBOM 31
50 #define RISCV_ISA_EXT_ZIHINTPAUSE 32
51 #define RISCV_ISA_EXT_SVNAPOT 33
52 #define RISCV_ISA_EXT_ZICBOZ 34
53 #define RISCV_ISA_EXT_SMAIA 35
54 #define RISCV_ISA_EXT_SSAIA 36
55 #define RISCV_ISA_EXT_ZBA 37
56 #define RISCV_ISA_EXT_ZBS 38
57 #define RISCV_ISA_EXT_ZICNTR 39
58 #define RISCV_ISA_EXT_ZICSR 40
59 #define RISCV_ISA_EXT_ZIFENCEI 41
60 #define RISCV_ISA_EXT_ZIHPM 42
61
62 #define RISCV_ISA_EXT_MAX 64
63
64 #ifdef CONFIG_RISCV_M_MODE
65 #define RISCV_ISA_EXT_SxAIA RISCV_ISA_EXT_SMAIA
66 #else
67 #define RISCV_ISA_EXT_SxAIA RISCV_ISA_EXT_SSAIA
68 #endif
69
70 #ifndef __ASSEMBLY__
71
72 #include <linux/jump_label.h>
73
74 unsigned long riscv_get_elf_hwcap(void);
75
76 struct riscv_isa_ext_data {
77 const unsigned int id;
78 const char *name;
79 const char *property;
80 };
81
82 extern const struct riscv_isa_ext_data riscv_isa_ext[];
83 extern const size_t riscv_isa_ext_count;
84 extern bool riscv_isa_fallback;
85
86 unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap);
87
88 #define riscv_isa_extension_mask(ext) BIT_MASK(RISCV_ISA_EXT_##ext)
89
90 bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, int bit);
91 #define riscv_isa_extension_available(isa_bitmap, ext) \
92 __riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_##ext)
93
94 static __always_inline bool
riscv_has_extension_likely(const unsigned long ext)95 riscv_has_extension_likely(const unsigned long ext)
96 {
97 compiletime_assert(ext < RISCV_ISA_EXT_MAX,
98 "ext must be < RISCV_ISA_EXT_MAX");
99
100 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) {
101 asm_volatile_goto(
102 ALTERNATIVE("j %l[l_no]", "nop", 0, %[ext], 1)
103 :
104 : [ext] "i" (ext)
105 :
106 : l_no);
107 } else {
108 if (!__riscv_isa_extension_available(NULL, ext))
109 goto l_no;
110 }
111
112 return true;
113 l_no:
114 return false;
115 }
116
117 static __always_inline bool
riscv_has_extension_unlikely(const unsigned long ext)118 riscv_has_extension_unlikely(const unsigned long ext)
119 {
120 compiletime_assert(ext < RISCV_ISA_EXT_MAX,
121 "ext must be < RISCV_ISA_EXT_MAX");
122
123 if (IS_ENABLED(CONFIG_RISCV_ALTERNATIVE)) {
124 asm_volatile_goto(
125 ALTERNATIVE("nop", "j %l[l_yes]", 0, %[ext], 1)
126 :
127 : [ext] "i" (ext)
128 :
129 : l_yes);
130 } else {
131 if (__riscv_isa_extension_available(NULL, ext))
132 goto l_yes;
133 }
134
135 return false;
136 l_yes:
137 return true;
138 }
139
140 #endif
141
142 #endif /* _ASM_RISCV_HWCAP_H */
143
