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Merge branches 'for-5.1/upstream-fixes', 'for-5.2/core', 'for-5.2/ish', 'for-5.2...
[mirror_ubuntu-kernels.git] / arch / x86 / include / asm / cpufeature.h
CommitLineData
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
PA		 10#include <linux/bitops.h>
11
39c06df4
BP		 12enum 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,
95ca0ee8 32 CPUID_7_EDX,
39c06df4
BP		 33};
34
9def39be 35#ifdef CONFIG_X86_FEATURE_NAMES
fa1408e4
PA		 36extern const char * const x86_cap_flags[NCAPINTS*32];
37extern const char * const x86_power_flags[32];
9def39be
JT		 38#define X86_CAP_FMT "%s"
39#define x86_cap_flag(flag) x86_cap_flags[flag]
40#else
41#define X86_CAP_FMT "%d:%d"
42#define x86_cap_flag(flag) ((flag) >> 5), ((flag) & 31)
43#endif
fa1408e4 44
80a208bd
BP		 45/*
46 * In order to save room, we index into this array by doing
47 * X86_BUG_<name> - NCAPINTS*32.
48 */
49extern const char * const x86_bug_flags[NBUGINTS*32];
50
0f8d2b92
IM		 51#define test_cpu_cap(c, bit) \
52 test_bit(bit, (unsigned long *)((c)->x86_capability))
53
8eda072e
DH		 54/*
55 * There are 32 bits/features in each mask word. The high bits
56 * (selected with (bit>>5) give us the word number and the low 5
57 * bits give us the bit/feature number inside the word.
58 * (1UL<<((bit)&31) gives us a mask for the feature_bit so we can
59 * see if it is set in the mask word.
60 */
61#define CHECK_BIT_IN_MASK_WORD(maskname, word, bit) \
62 (((bit)>>5)==(word) && (1UL<<((bit)&31) & maskname##word ))
63
64#define REQUIRED_MASK_BIT_SET(feature_bit) \
65 ( CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 0, feature_bit) || \
66 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 1, feature_bit) || \
67 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 2, feature_bit) || \
68 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 3, feature_bit) || \
69 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 4, feature_bit) || \
70 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 5, feature_bit) || \
71 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 6, feature_bit) || \
72 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 7, feature_bit) || \
73 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 8, feature_bit) || \
74 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 9, feature_bit) || \
75 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 10, feature_bit) || \
76 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 11, feature_bit) || \
77 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 12, feature_bit) || \
78 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 13, feature_bit) || \
79 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 14, feature_bit) || \
80 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 15, feature_bit) || \
81 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \
82 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \
95ca0ee8 83 CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \
8eda072e 84 REQUIRED_MASK_CHECK || \
95ca0ee8 85 BUILD_BUG_ON_ZERO(NCAPINTS != 19))
349c004e 86
8eda072e
DH		 87#define DISABLED_MASK_BIT_SET(feature_bit) \
88 ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \
89 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 1, feature_bit) || \
90 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 2, feature_bit) || \
91 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 3, feature_bit) || \
92 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 4, feature_bit) || \
93 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 5, feature_bit) || \
94 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 6, feature_bit) || \
95 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 7, feature_bit) || \
96 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 8, feature_bit) || \
97 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 9, feature_bit) || \
98 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 10, feature_bit) || \
99 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 11, feature_bit) || \
100 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 12, feature_bit) || \
101 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 13, feature_bit) || \
102 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 14, feature_bit) || \
103 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 15, feature_bit) || \
104 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \
105 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \
95ca0ee8 106 CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \
8eda072e 107 DISABLED_MASK_CHECK || \
95ca0ee8 108 BUILD_BUG_ON_ZERO(NCAPINTS != 19))
381aa07a 109
349c004e
CL		 110#define cpu_has(c, bit) \
111 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
0f8d2b92
IM		 112 test_cpu_cap(c, bit))
113
349c004e 114#define this_cpu_has(bit) \
f6027c81
JH		 115 (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
116 x86_this_cpu_test_bit(bit, \
117 (unsigned long __percpu *)&cpu_info.x86_capability))
349c004e 118
381aa07a
DH		 119/*
120 * This macro is for detection of features which need kernel
121 * infrastructure to be used. It may *not* directly test the CPU
122 * itself. Use the cpu_has() family if you want true runtime
123 * testing of CPU features, like in hypervisor code where you are
124 * supporting a possible guest feature where host support for it
125 * is not relevant.
126 */
127#define cpu_feature_enabled(bit) \
f2cc8e07 128 (__builtin_constant_p(bit) && DISABLED_MASK_BIT_SET(bit) ? 0 : static_cpu_has(bit))
381aa07a 129
7b11fb51
PA		 130#define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit)
131
53756d37 132#define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
0b00de85
AK		 133
134extern void setup_clear_cpu_cap(unsigned int bit);
135extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
136
404ee5b1
AK		 137#define setup_force_cpu_cap(bit) do { \
138 set_cpu_cap(&boot_cpu_data, bit); \
3e0c3737 139 set_bit(bit, (unsigned long *)cpu_caps_set); \
404ee5b1 140} while (0)
53756d37 141
6cbd2171
TG		 142#define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit)
143
e9666d10 144#if defined(__clang__) && !defined(CONFIG_CC_HAS_ASM_GOTO)
b1ae32db
AS		 145
146/*
147 * Workaround for the sake of BPF compilation which utilizes kernel
148 * headers, but clang does not support ASM GOTO and fails the build.
149 */
150#ifndef __BPF_TRACING__
151#warning "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
152#endif
153
154#define static_cpu_has(bit) boot_cpu_has(bit)
155
156#else
157
a3c8acd0
PA		 158/*
159 * Static testing of CPU features. Used the same as boot_cpu_has().
a362bf9f
BP		 160 * These will statically patch the target code for additional
161 * performance.
a3c8acd0 162 */
bc696ca0 163static __always_inline __pure bool _static_cpu_has(u16 bit)
4a90a99c 164{
c3462ba9
IM		 165 asm_volatile_goto("1: jmp 6f\n"
166 "2:\n"
167 ".skip -(((5f-4f) - (2b-1b)) > 0) * "
168 "((5f-4f) - (2b-1b)),0x90\n"
169 "3:\n"
170 ".section .altinstructions,\"a\"\n"
171 " .long 1b - .\n" /* src offset */
172 " .long 4f - .\n" /* repl offset */
173 " .word %P[always]\n" /* always replace */
174 " .byte 3b - 1b\n" /* src len */
175 " .byte 5f - 4f\n" /* repl len */
176 " .byte 3b - 2b\n" /* pad len */
177 ".previous\n"
178 ".section .altinstr_replacement,\"ax\"\n"
179 "4: jmp %l[t_no]\n"
180 "5:\n"
181 ".previous\n"
182 ".section .altinstructions,\"a\"\n"
183 " .long 1b - .\n" /* src offset */
184 " .long 0\n" /* no replacement */
185 " .word %P[feature]\n" /* feature bit */
186 " .byte 3b - 1b\n" /* src len */
187 " .byte 0\n" /* repl len */
188 " .byte 0\n" /* pad len */
189 ".previous\n"
190 ".section .altinstr_aux,\"ax\"\n"
191 "6:\n"
192 " testb %[bitnum],%[cap_byte]\n"
193 " jnz %l[t_yes]\n"
194 " jmp %l[t_no]\n"
195 ".previous\n"
3197b04b
PZ		 196 : : [feature] "i" (bit),
197 [always] "i" (X86_FEATURE_ALWAYS),
198 [bitnum] "i" (1 << (bit & 7)),
5355ccbe
PZ		 199 [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
200 : : t_yes, t_no);
201t_yes:
202 return true;
203t_no:
204 return false;
4a90a99c
BP		 205}
206
bc696ca0 207#define static_cpu_has(bit) \
4a90a99c
BP		 208( \
209 __builtin_constant_p(boot_cpu_has(bit)) ? \
210 boot_cpu_has(bit) : \
bc696ca0 211 _static_cpu_has(bit) \
4a90a99c 212)
b1ae32db 213#endif
a3c8acd0 214
9b13a93d
BP		 215#define cpu_has_bug(c, bit) cpu_has(c, (bit))
216#define set_cpu_bug(c, bit) set_cpu_cap(c, (bit))
217#define clear_cpu_bug(c, bit) clear_cpu_cap(c, (bit))
65fc985b 218
9b13a93d 219#define static_cpu_has_bug(bit) static_cpu_has((bit))
9b13a93d 220#define boot_cpu_has_bug(bit) cpu_has_bug(&boot_cpu_data, (bit))
a588b983 221#define boot_cpu_set_bug(bit) set_cpu_cap(&boot_cpu_data, (bit))
65fc985b 222
9b13a93d
BP		 223#define MAX_CPU_FEATURES (NCAPINTS * 32)
224#define cpu_have_feature boot_cpu_has
2b9c1f03 225
9b13a93d
BP		 226#define CPU_FEATURE_TYPEFMT "x86,ven%04Xfam%04Xmod%04X"
227#define CPU_FEATURE_TYPEVAL boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
228 boot_cpu_data.x86_model
2b9c1f03 229
c3462ba9 230#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
1965aae3 231#endif /* _ASM_X86_CPUFEATURE_H */
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