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Commit | Line | Data |
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2decb194 | 1 | /* |
3f79410c | 2 | * Routines to identify additional cpu features that are scattered in |
2decb194 PA |
3 | * cpuid space. |
4 | */ | |
5 | #include <linux/cpu.h> | |
6 | ||
7 | #include <asm/pat.h> | |
8 | #include <asm/processor.h> | |
9 | ||
10 | #include <asm/apic.h> | |
11 | ||
12 | struct cpuid_bit { | |
13 | u16 feature; | |
14 | u8 reg; | |
15 | u8 bit; | |
16 | u32 level; | |
17 | u32 sub_leaf; | |
18 | }; | |
19 | ||
47bdf337 HC |
20 | /* Please keep the leaf sorted by cpuid_bit.level for faster search. */ |
21 | static const struct cpuid_bit cpuid_bits[] = { | |
22 | { X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 }, | |
7ce7f35b TG |
23 | { X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 }, |
24 | { X86_FEATURE_INTEL_PT, CPUID_EBX, 25, 0x00000007, 0 }, | |
47bdf337 HC |
25 | { X86_FEATURE_AVX512_4VNNIW, CPUID_EDX, 2, 0x00000007, 0 }, |
26 | { X86_FEATURE_AVX512_4FMAPS, CPUID_EDX, 3, 0x00000007, 0 }, | |
4632cd99 | 27 | { X86_FEATURE_SPEC_CTRL, CPUID_EDX, 26, 0x00000007, 0 }, |
7ce7f35b TG |
28 | { X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 }, |
29 | { X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 }, | |
30 | { X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 }, | |
ab66a33b | 31 | { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 }, |
7ce7f35b TG |
32 | { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 }, |
33 | { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, | |
47bdf337 HC |
34 | { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, |
35 | { 0, 0, 0, 0, 0 } | |
2decb194 PA |
36 | }; |
37 | ||
148f9bb8 | 38 | void init_scattered_cpuid_features(struct cpuinfo_x86 *c) |
2decb194 PA |
39 | { |
40 | u32 max_level; | |
41 | u32 regs[4]; | |
42 | const struct cpuid_bit *cb; | |
43 | ||
2decb194 PA |
44 | for (cb = cpuid_bits; cb->feature; cb++) { |
45 | ||
46 | /* Verify that the level is valid */ | |
47 | max_level = cpuid_eax(cb->level & 0xffff0000); | |
48 | if (max_level < cb->level || | |
49 | max_level > (cb->level | 0xffff)) | |
50 | continue; | |
51 | ||
47f10a36 HC |
52 | cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX], |
53 | ®s[CPUID_EBX], ®s[CPUID_ECX], | |
54 | ®s[CPUID_EDX]); | |
2decb194 PA |
55 | |
56 | if (regs[cb->reg] & (1 << cb->bit)) | |
57 | set_cpu_cap(c, cb->feature); | |
58 | } | |
59 | } | |
47bdf337 HC |
60 | |
61 | u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf, | |
62 | enum cpuid_regs_idx reg) | |
63 | { | |
64 | const struct cpuid_bit *cb; | |
65 | u32 cpuid_val = 0; | |
66 | ||
67 | for (cb = cpuid_bits; cb->feature; cb++) { | |
68 | ||
69 | if (level > cb->level) | |
70 | continue; | |
71 | ||
72 | if (level < cb->level) | |
73 | break; | |
74 | ||
75 | if (reg == cb->reg && sub_leaf == cb->sub_leaf) { | |
76 | if (cpu_has(&boot_cpu_data, cb->feature)) | |
77 | cpuid_val |= BIT(cb->bit); | |
78 | } | |
79 | } | |
80 | ||
81 | return cpuid_val; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf); |