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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 | |
cd4d09ec | 5 | #include <asm/processor.h> |
e2604b49 | 6 | |
fa1408e4 PA |
7 | #if defined(__KERNEL__) && !defined(__ASSEMBLY__) |
8 | ||
a3c8acd0 | 9 | #include <asm/asm.h> |
fa1408e4 PA |
10 | #include <linux/bitops.h> |
11 | ||
39c06df4 BP |
12 | enum cpuid_leafs |
13 | { | |
14 | CPUID_1_EDX = 0, | |
15 | CPUID_8000_0001_EDX, | |
16 | CPUID_8086_0001_EDX, | |
17 | CPUID_LNX_1, | |
18 | CPUID_1_ECX, | |
19 | CPUID_C000_0001_EDX, | |
20 | CPUID_8000_0001_ECX, | |
21 | CPUID_LNX_2, | |
22 | CPUID_LNX_3, | |
23 | CPUID_7_0_EBX, | |
24 | CPUID_D_1_EAX, | |
25 | CPUID_F_0_EDX, | |
26 | CPUID_F_1_EDX, | |
27 | CPUID_8000_0008_EBX, | |
28 | CPUID_6_EAX, | |
29 | CPUID_8000_000A_EDX, | |
dfb4a70f | 30 | CPUID_7_ECX, |
71faad43 | 31 | CPUID_8000_0007_EBX, |
39c06df4 BP |
32 | }; |
33 | ||
9def39be | 34 | #ifdef CONFIG_X86_FEATURE_NAMES |
fa1408e4 PA |
35 | extern const char * const x86_cap_flags[NCAPINTS*32]; |
36 | extern const char * const x86_power_flags[32]; | |
9def39be JT |
37 | #define X86_CAP_FMT "%s" |
38 | #define x86_cap_flag(flag) x86_cap_flags[flag] | |
39 | #else | |
40 | #define X86_CAP_FMT "%d:%d" | |
41 | #define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31) | |
42 | #endif | |
fa1408e4 | 43 | |
80a208bd BP |
44 | /* |
45 | * In order to save room, we index into this array by doing | |
46 | * X86_BUG_<name> - NCAPINTS*32. | |
47 | */ | |
48 | extern const char * const x86_bug_flags[NBUGINTS*32]; | |
49 | ||
0f8d2b92 IM |
50 | #define test_cpu_cap(c, bit) \ |
51 | test_bit(bit, (unsigned long *)((c)->x86_capability)) | |
52 | ||
8eda072e DH |
53 | /* |
54 | * There are 32 bits/features in each mask word. The high bits | |
55 | * (selected with (bit>>5) give us the word number and the low 5 | |
56 | * bits give us the bit/feature number inside the word. | |
57 | * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can | |
58 | * see if it is set in the mask word. | |
59 | */ | |
60 | #define CHECK_BIT_IN_MASK_WORD(maskname, word, bit) \ | |
61 | (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word )) | |
62 | ||
63 | #define REQUIRED_MASK_BIT_SET(feature_bit) \ | |
64 | ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 0, feature_bit) || \ | |
65 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 1, feature_bit) || \ | |
66 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 2, feature_bit) || \ | |
67 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 3, feature_bit) || \ | |
68 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 4, feature_bit) || \ | |
69 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 5, feature_bit) || \ | |
70 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 6, feature_bit) || \ | |
71 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 7, feature_bit) || \ | |
72 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 8, feature_bit) || \ | |
73 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 9, feature_bit) || \ | |
74 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) || \ | |
75 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) || \ | |
76 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) || \ | |
77 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) || \ | |
78 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) || \ | |
79 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) || \ | |
80 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \ | |
81 | CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \ | |
82 | REQUIRED_MASK_CHECK || \ | |
1e61f78b | 83 | BUILD_BUG_ON_ZERO(NCAPINTS != 18)) |
349c004e | 84 | |
8eda072e DH |
85 | #define DISABLED_MASK_BIT_SET(feature_bit) \ |
86 | ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \ | |
87 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 1, feature_bit) || \ | |
88 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 2, feature_bit) || \ | |
89 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 3, feature_bit) || \ | |
90 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 4, feature_bit) || \ | |
91 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 5, feature_bit) || \ | |
92 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 6, feature_bit) || \ | |
93 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 7, feature_bit) || \ | |
94 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 8, feature_bit) || \ | |
95 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 9, feature_bit) || \ | |
96 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) || \ | |
97 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) || \ | |
98 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) || \ | |
99 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) || \ | |
100 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) || \ | |
101 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) || \ | |
102 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \ | |
103 | CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \ | |
104 | DISABLED_MASK_CHECK || \ | |
1e61f78b | 105 | BUILD_BUG_ON_ZERO(NCAPINTS != 18)) |
381aa07a | 106 | |
349c004e CL |
107 | #define cpu_has(c, bit) \ |
108 | (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \ | |
0f8d2b92 IM |
109 | test_cpu_cap(c, bit)) |
110 | ||
349c004e CL |
111 | #define this_cpu_has(bit) \ |
112 | (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \ | |
113 | x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability)) | |
114 | ||
381aa07a DH |
115 | /* |
116 | * This macro is for detection of features which need kernel | |
117 | * infrastructure to be used. It may *not* directly test the CPU | |
118 | * itself. Use the cpu_has() family if you want true runtime | |
119 | * testing of CPU features, like in hypervisor code where you are | |
120 | * supporting a possible guest feature where host support for it | |
121 | * is not relevant. | |
122 | */ | |
123 | #define cpu_feature_enabled(bit) \ | |
f2cc8e07 | 124 | (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit)) |
381aa07a | 125 | |
7b11fb51 PA |
126 | #define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit) |
127 | ||
53756d37 JF |
128 | #define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability)) |
129 | #define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability)) | |
7d851c8d AK |
130 | #define setup_clear_cpu_cap(bit) do { \ |
131 | clear_cpu_cap(&boot_cpu_data, bit); \ | |
3e0c3737 | 132 | set_bit(bit, (unsigned long *)cpu_caps_cleared); \ |
7d851c8d | 133 | } while (0) |
404ee5b1 AK |
134 | #define setup_force_cpu_cap(bit) do { \ |
135 | set_cpu_cap(&boot_cpu_data, bit); \ | |
3e0c3737 | 136 | set_bit(bit, (unsigned long *)cpu_caps_set); \ |
404ee5b1 | 137 | } while (0) |
53756d37 | 138 | |
a362bf9f | 139 | #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS) |
a3c8acd0 PA |
140 | /* |
141 | * Static testing of CPU features. Used the same as boot_cpu_has(). | |
a362bf9f BP |
142 | * These will statically patch the target code for additional |
143 | * performance. | |
a3c8acd0 | 144 | */ |
bc696ca0 | 145 | static __always_inline __pure bool _static_cpu_has(u16 bit) |
4a90a99c | 146 | { |
2476f2fa | 147 | asm_volatile_goto("1: jmp 6f\n" |
4a90a99c | 148 | "2:\n" |
4332195c BP |
149 | ".skip -(((5f-4f) - (2b-1b)) > 0) * " |
150 | "((5f-4f) - (2b-1b)),0x90\n" | |
151 | "3:\n" | |
4a90a99c BP |
152 | ".section .altinstructions,\"a\"\n" |
153 | " .long 1b - .\n" /* src offset */ | |
4332195c | 154 | " .long 4f - .\n" /* repl offset */ |
4a90a99c | 155 | " .word %P1\n" /* always replace */ |
4332195c BP |
156 | " .byte 3b - 1b\n" /* src len */ |
157 | " .byte 5f - 4f\n" /* repl len */ | |
158 | " .byte 3b - 2b\n" /* pad len */ | |
4a90a99c BP |
159 | ".previous\n" |
160 | ".section .altinstr_replacement,\"ax\"\n" | |
48c7a250 | 161 | "4: jmp %l[t_no]\n" |
4332195c | 162 | "5:\n" |
4a90a99c BP |
163 | ".previous\n" |
164 | ".section .altinstructions,\"a\"\n" | |
165 | " .long 1b - .\n" /* src offset */ | |
166 | " .long 0\n" /* no replacement */ | |
167 | " .word %P0\n" /* feature bit */ | |
4332195c | 168 | " .byte 3b - 1b\n" /* src len */ |
4a90a99c | 169 | " .byte 0\n" /* repl len */ |
4332195c | 170 | " .byte 0\n" /* pad len */ |
4a90a99c | 171 | ".previous\n" |
2476f2fa BG |
172 | ".section .altinstr_aux,\"ax\"\n" |
173 | "6:\n" | |
174 | " testb %[bitnum],%[cap_byte]\n" | |
175 | " jnz %l[t_yes]\n" | |
176 | " jmp %l[t_no]\n" | |
177 | ".previous\n" | |
178 | : : "i" (bit), "i" (X86_FEATURE_ALWAYS), | |
179 | [bitnum] "i" (1 << (bit & 7)), | |
180 | [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3]) | |
181 | : : t_yes, t_no); | |
182 | t_yes: | |
4a90a99c BP |
183 | return true; |
184 | t_no: | |
185 | return false; | |
4a90a99c BP |
186 | } |
187 | ||
bc696ca0 | 188 | #define static_cpu_has(bit) \ |
4a90a99c BP |
189 | ( \ |
190 | __builtin_constant_p(boot_cpu_has(bit)) ? \ | |
191 | boot_cpu_has(bit) : \ | |
bc696ca0 | 192 | _static_cpu_has(bit) \ |
4a90a99c | 193 | ) |
1ba4f22c PA |
194 | #else |
195 | /* | |
a362bf9f BP |
196 | * Fall back to dynamic for gcc versions which don't support asm goto. Should be |
197 | * a minority now anyway. | |
1ba4f22c | 198 | */ |
4a90a99c | 199 | #define static_cpu_has(bit) boot_cpu_has(bit) |
1ba4f22c | 200 | #endif |
a3c8acd0 | 201 | |
9b13a93d BP |
202 | #define cpu_has_bug(c, bit) cpu_has(c, (bit)) |
203 | #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit)) | |
204 | #define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit)) | |
65fc985b | 205 | |
9b13a93d | 206 | #define static_cpu_has_bug(bit) static_cpu_has((bit)) |
9b13a93d | 207 | #define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit)) |
a588b983 | 208 | #define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit)) |
65fc985b | 209 | |
9b13a93d BP |
210 | #define MAX_CPU_FEATURES (NCAPINTS * 32) |
211 | #define cpu_have_feature boot_cpu_has | |
2b9c1f03 | 212 | |
9b13a93d BP |
213 | #define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X" |
214 | #define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \ | |
215 | boot_cpu_data.x86_model | |
2b9c1f03 | 216 | |
fa1408e4 | 217 | #endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */ |
1965aae3 | 218 | #endif /* _ASM_X86_CPUFEATURE_H */ |