1
2#ifndef _ASM_X86_CPUFEATURE_H
3#define _ASM_X86_CPUFEATURE_H
4
5#include <asm/processor.h>
6
7#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
8
9#include <asm/asm.h>
10#include <linux/bitops.h>
11#include <asm/alternative.h>
12
13enum 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,
26 CPUID_LNX_4,
27 CPUID_7_1_EAX,
28 CPUID_8000_0008_EBX,
29 CPUID_6_EAX,
30 CPUID_8000_000A_EDX,
31 CPUID_7_ECX,
32 CPUID_8000_0007_EBX,
33 CPUID_7_EDX,
34 CPUID_8000_001F_EAX,
35};
36
37#ifdef CONFIG_X86_FEATURE_NAMES
38extern const char * const x86_cap_flags[NCAPINTS*32];
39extern const char * const x86_power_flags[32];
40#define X86_CAP_FMT "%s"
41#define x86_cap_flag(flag) x86_cap_flags[flag]
42#else
43#define X86_CAP_FMT "%d:%d"
44#define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
45#endif
46
47
48
49
50
51extern const char * const x86_bug_flags[NBUGINTS*32];
52
53#define test_cpu_cap(c, bit) \
54 test_bit(bit, (unsigned long *)((c)->x86_capability))
55
56
57
58
59
60
61
62
63#define CHECK_BIT_IN_MASK_WORD(maskname, word, bit) \
64 (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
65
66
67
68
69
70
71
72
73#define REQUIRED_MASK_BIT_SET(feature_bit) \
74 ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 0, feature_bit) || \
75 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 1, feature_bit) || \
76 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 2, feature_bit) || \
77 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 3, feature_bit) || \
78 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 4, feature_bit) || \
79 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 5, feature_bit) || \
80 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 6, feature_bit) || \
81 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 7, feature_bit) || \
82 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 8, feature_bit) || \
83 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 9, feature_bit) || \
84 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) || \
85 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) || \
86 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) || \
87 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) || \
88 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) || \
89 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) || \
90 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \
91 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \
92 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \
93 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, feature_bit) || \
94 REQUIRED_MASK_CHECK || \
95 BUILD_BUG_ON_ZERO(NCAPINTS != 20))
96
97#define DISABLED_MASK_BIT_SET(feature_bit) \
98 ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \
99 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 1, feature_bit) || \
100 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 2, feature_bit) || \
101 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 3, feature_bit) || \
102 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 4, feature_bit) || \
103 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 5, feature_bit) || \
104 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 6, feature_bit) || \
105 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 7, feature_bit) || \
106 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 8, feature_bit) || \
107 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 9, feature_bit) || \
108 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) || \
109 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) || \
110 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) || \
111 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) || \
112 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) || \
113 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) || \
114 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \
115 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \
116 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \
117 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, feature_bit) || \
118 DISABLED_MASK_CHECK || \
119 BUILD_BUG_ON_ZERO(NCAPINTS != 20))
120
121#define cpu_has(c, bit) \
122 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
123 test_cpu_cap(c, bit))
124
125#define this_cpu_has(bit) \
126 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
127 x86_this_cpu_test_bit(bit, \
128 (unsigned long __percpu *)&cpu_info.x86_capability))
129
130
131
132
133
134
135
136
137
138#define cpu_feature_enabled(bit) \
139 (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
140
141#define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit)
142
143#define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
144
145extern void setup_clear_cpu_cap(unsigned int bit);
146extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
147
148#define setup_force_cpu_cap(bit) do { \
149 set_cpu_cap(&boot_cpu_data, bit); \
150 set_bit(bit, (unsigned long *)cpu_caps_set); \
151} while (0)
152
153#define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit)
154
155#if defined(__clang__) && !defined(CONFIG_CC_HAS_ASM_GOTO)
156
157
158
159
160
161#ifndef __BPF_TRACING__
162#warning "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
163#endif
164
165#define static_cpu_has(bit) boot_cpu_has(bit)
166
167#else
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182static __always_inline bool _static_cpu_has(u16 bit)
183{
184 asm_volatile_goto(
185 ALTERNATIVE_TERNARY("jmp 6f", %P[feature], "", "jmp %l[t_no]")
186 ".pushsection .altinstr_aux,\"ax\"\n"
187 "6:\n"
188 " testb %[bitnum]," _ASM_RIP(%P[cap_byte]) "\n"
189 " jnz %l[t_yes]\n"
190 " jmp %l[t_no]\n"
191 ".popsection\n"
192 : : [feature] "i" (bit),
193 [bitnum] "i" (1 << (bit & 7)),
194 [cap_byte] "i" (&((const char *)boot_cpu_data.x86_capability)[bit >> 3])
195 : : t_yes, t_no);
196t_yes:
197 return true;
198t_no:
199 return false;
200}
201
202#define static_cpu_has(bit) \
203( \
204 __builtin_constant_p(boot_cpu_has(bit)) ? \
205 boot_cpu_has(bit) : \
206 _static_cpu_has(bit) \
207)
208#endif
209
210#define cpu_has_bug(c, bit) cpu_has(c, (bit))
211#define set_cpu_bug(c, bit) set_cpu_cap(c, (bit))
212#define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit))
213
214#define static_cpu_has_bug(bit) static_cpu_has((bit))
215#define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit))
216#define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit))
217
218#define MAX_CPU_FEATURES (NCAPINTS * 32)
219#define cpu_have_feature boot_cpu_has
220
221#define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X"
222#define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
223 boot_cpu_data.x86_model
224
225#endif
226#endif
227