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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_CPUFEATURE_H |
3 | #define _ASM_X86_CPUFEATURE_H | |
7b11fb51 | 4 | |
d5a581d8 | 5 | #include <asm/processor.h> |
c3462ba9 IM |
6 | |
7 | #if defined(__KERNEL__) && !defined(__ASSEMBLY__) | |
8 | ||
a3c8acd0 | 9 | #include <asm/asm.h> |
fa1408e4 | 10 | #include <linux/bitops.h> |
2fe2a2c7 | 11 | #include <asm/alternative.h> |
fa1408e4 | 12 | |
39c06df4 BP |
13 | enum cpuid_leafs |
14 | { | |
15 | CPUID_1_EDX = 0, | |
16 | CPUID_8000_0001_EDX, | |
17 | CPUID_8086_0001_EDX, | |
18 | CPUID_LNX_1, | |
19 | CPUID_1_ECX, | |
20 | CPUID_C000_0001_EDX, | |
21 | CPUID_8000_0001_ECX, | |
22 | CPUID_LNX_2, | |
23 | CPUID_LNX_3, | |
24 | CPUID_7_0_EBX, | |
25 | CPUID_D_1_EAX, | |
acec0ce0 | 26 | CPUID_LNX_4, |
b302e4b1 | 27 | CPUID_7_1_EAX, |
39c06df4 BP |
28 | CPUID_8000_0008_EBX, |
29 | CPUID_6_EAX, | |
30 | CPUID_8000_000A_EDX, | |
dfb4a70f | 31 | CPUID_7_ECX, |
71faad43 | 32 | CPUID_8000_0007_EBX, |
95ca0ee8 | 33 | CPUID_7_EDX, |
fb35d30f | 34 | CPUID_8000_001F_EAX, |
8415a748 | 35 | CPUID_8000_0021_EAX, |
39c06df4 BP |
36 | }; |
37 | ||
1625c833 BP |
38 | #define X86_CAP_FMT_NUM "%d:%d" |
39 | #define x86_cap_flag_num(flag) ((flag) >> 5), ((flag) & 31) | |
40 | ||
fa1408e4 PA |
41 | extern const char * const x86_cap_flags[NCAPINTS*32]; |
42 | extern const char * const x86_power_flags[32]; | |
9def39be JT |
43 | #define X86_CAP_FMT "%s" |
44 | #define x86_cap_flag(flag) x86_cap_flags[flag] | |
fa1408e4 | 45 | |
80a208bd BP |
46 | /* |
47 | * In order to save room, we index into this array by doing | |
48 | * X86_BUG_<name> - NCAPINTS*32. | |
49 | */ | |
50 | extern const char * const x86_bug_flags[NBUGINTS*32]; | |
51 | ||
0f8d2b92 | 52 | #define test_cpu_cap(c, bit) \ |
a6a5eb26 | 53 | arch_test_bit(bit, (unsigned long *)((c)->x86_capability)) |
0f8d2b92 | 54 | |
8eda072e DH |
55 | /* |
56 | * There are 32 bits/features in each mask word. The high bits | |
57 | * (selected with (bit>>5) give us the word number and the low 5 | |
58 | * bits give us the bit/feature number inside the word. | |
59 | * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can | |
60 | * see if it is set in the mask word. | |
61 | */ | |
62 | #define CHECK_BIT_IN_MASK_WORD(maskname, word, bit) \ | |
63 | (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word )) | |
64 | ||
cbb1133b CJ |
65 | /* |
66 | * {REQUIRED,DISABLED}_MASK_CHECK below may seem duplicated with the | |
67 | * following BUILD_BUG_ON_ZERO() check but when NCAPINTS gets changed, all | |
68 | * header macros which use NCAPINTS need to be changed. The duplicated macro | |
69 | * use causes the compiler to issue errors for all headers so that all usage | |
70 | * sites can be corrected. | |
71 | */ | |
8eda072e DH |
72 | #define REQUIRED_MASK_BIT_SET(feature_bit) \ |
73 | ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 0, feature_bit) || \ | |
74 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 1, feature_bit) || \ | |
75 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 2, feature_bit) || \ | |
76 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 3, feature_bit) || \ | |
77 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 4, feature_bit) || \ | |
78 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 5, feature_bit) || \ | |
79 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 6, feature_bit) || \ | |
80 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 7, feature_bit) || \ | |
81 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 8, feature_bit) || \ | |
82 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 9, feature_bit) || \ | |
83 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) || \ | |
84 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) || \ | |
85 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) || \ | |
86 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) || \ | |
87 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) || \ | |
88 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) || \ | |
89 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \ | |
90 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \ | |
95ca0ee8 | 91 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \ |
fb35d30f | 92 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, feature_bit) || \ |
8415a748 | 93 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 20, feature_bit) || \ |
7f274e60 | 94 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 21, feature_bit) || \ |
8eda072e | 95 | REQUIRED_MASK_CHECK || \ |
7f274e60 | 96 | BUILD_BUG_ON_ZERO(NCAPINTS != 22)) |
349c004e | 97 | |
8eda072e DH |
98 | #define DISABLED_MASK_BIT_SET(feature_bit) \ |
99 | ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \ | |
100 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 1, feature_bit) || \ | |
101 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 2, feature_bit) || \ | |
102 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 3, feature_bit) || \ | |
103 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 4, feature_bit) || \ | |
104 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 5, feature_bit) || \ | |
105 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 6, feature_bit) || \ | |
106 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 7, feature_bit) || \ | |
107 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 8, feature_bit) || \ | |
108 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 9, feature_bit) || \ | |
109 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) || \ | |
110 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) || \ | |
111 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) || \ | |
112 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) || \ | |
113 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) || \ | |
114 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) || \ | |
115 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \ | |
116 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \ | |
95ca0ee8 | 117 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \ |
fb35d30f | 118 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, feature_bit) || \ |
8415a748 | 119 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 20, feature_bit) || \ |
7f274e60 | 120 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 21, feature_bit) || \ |
8eda072e | 121 | DISABLED_MASK_CHECK || \ |
7f274e60 | 122 | BUILD_BUG_ON_ZERO(NCAPINTS != 22)) |
381aa07a | 123 | |
349c004e CL |
124 | #define cpu_has(c, bit) \ |
125 | (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \ | |
0f8d2b92 IM |
126 | test_cpu_cap(c, bit)) |
127 | ||
349c004e | 128 | #define this_cpu_has(bit) \ |
f6027c81 JH |
129 | (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \ |
130 | x86_this_cpu_test_bit(bit, \ | |
131 | (unsigned long __percpu *)&cpu_info.x86_capability)) | |
349c004e | 132 | |
381aa07a DH |
133 | /* |
134 | * This macro is for detection of features which need kernel | |
135 | * infrastructure to be used. It may *not* directly test the CPU | |
136 | * itself. Use the cpu_has() family if you want true runtime | |
137 | * testing of CPU features, like in hypervisor code where you are | |
138 | * supporting a possible guest feature where host support for it | |
139 | * is not relevant. | |
140 | */ | |
141 | #define cpu_feature_enabled(bit) \ | |
f2cc8e07 | 142 | (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit)) |
381aa07a | 143 | |
7b11fb51 PA |
144 | #define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit) |
145 | ||
53756d37 | 146 | #define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability)) |
0b00de85 AK |
147 | |
148 | extern void setup_clear_cpu_cap(unsigned int bit); | |
149 | extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit); | |
150 | ||
404ee5b1 AK |
151 | #define setup_force_cpu_cap(bit) do { \ |
152 | set_cpu_cap(&boot_cpu_data, bit); \ | |
3e0c3737 | 153 | set_bit(bit, (unsigned long *)cpu_caps_set); \ |
404ee5b1 | 154 | } while (0) |
53756d37 | 155 | |
6cbd2171 TG |
156 | #define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit) |
157 | ||
a3c8acd0 | 158 | /* |
bfdd5a67 BP |
159 | * Static testing of CPU features. Used the same as boot_cpu_has(). It |
160 | * statically patches the target code for additional performance. Use | |
161 | * static_cpu_has() only in fast paths, where every cycle counts. Which | |
162 | * means that the boot_cpu_has() variant is already fast enough for the | |
163 | * majority of cases and you should stick to using it as it is generally | |
164 | * only two instructions: a RIP-relative MOV and a TEST. | |
05075036 PA |
165 | * |
166 | * Do not use an "m" constraint for [cap_byte] here: gcc doesn't know | |
167 | * that this is only used on a fallback path and will sometimes cause | |
168 | * it to manifest the address of boot_cpu_data in a register, fouling | |
169 | * the mainline (post-initialization) code. | |
a3c8acd0 | 170 | */ |
ae37a8cd | 171 | static __always_inline bool _static_cpu_has(u16 bit) |
4a90a99c | 172 | { |
4356e9f8 | 173 | asm goto( |
2fe2a2c7 | 174 | ALTERNATIVE_TERNARY("jmp 6f", %P[feature], "", "jmp %l[t_no]") |
05075036 | 175 | ".pushsection .altinstr_aux,\"ax\"\n" |
2fe2a2c7 | 176 | "6:\n" |
05075036 | 177 | " testb %[bitnum]," _ASM_RIP(%P[cap_byte]) "\n" |
2fe2a2c7 JG |
178 | " jnz %l[t_yes]\n" |
179 | " jmp %l[t_no]\n" | |
05075036 | 180 | ".popsection\n" |
3197b04b | 181 | : : [feature] "i" (bit), |
3197b04b | 182 | [bitnum] "i" (1 << (bit & 7)), |
05075036 | 183 | [cap_byte] "i" (&((const char *)boot_cpu_data.x86_capability)[bit >> 3]) |
5355ccbe PZ |
184 | : : t_yes, t_no); |
185 | t_yes: | |
186 | return true; | |
187 | t_no: | |
188 | return false; | |
4a90a99c BP |
189 | } |
190 | ||
bc696ca0 | 191 | #define static_cpu_has(bit) \ |
4a90a99c BP |
192 | ( \ |
193 | __builtin_constant_p(boot_cpu_has(bit)) ? \ | |
194 | boot_cpu_has(bit) : \ | |
bc696ca0 | 195 | _static_cpu_has(bit) \ |
4a90a99c | 196 | ) |
a3c8acd0 | 197 | |
9b13a93d BP |
198 | #define cpu_has_bug(c, bit) cpu_has(c, (bit)) |
199 | #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit)) | |
200 | #define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit)) | |
65fc985b | 201 | |
9b13a93d | 202 | #define static_cpu_has_bug(bit) static_cpu_has((bit)) |
9b13a93d | 203 | #define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit)) |
a588b983 | 204 | #define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit)) |
65fc985b | 205 | |
9b13a93d BP |
206 | #define MAX_CPU_FEATURES (NCAPINTS * 32) |
207 | #define cpu_have_feature boot_cpu_has | |
2b9c1f03 | 208 | |
9b13a93d BP |
209 | #define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X" |
210 | #define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \ | |
211 | boot_cpu_data.x86_model | |
2b9c1f03 | 212 | |
c3462ba9 | 213 | #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */ |
1965aae3 | 214 | #endif /* _ASM_X86_CPUFEATURE_H */ |