2 * Routines to identify additional cpu features that are scattered in
8 #include <asm/processor.h>
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 },
23 { X86_FEATURE_EPB
, CPUID_ECX
, 3, 0x00000006, 0 },
24 { X86_FEATURE_INTEL_PT
, CPUID_EBX
, 25, 0x00000007, 0 },
25 { X86_FEATURE_AVX512_4VNNIW
, CPUID_EDX
, 2, 0x00000007, 0 },
26 { X86_FEATURE_AVX512_4FMAPS
, CPUID_EDX
, 3, 0x00000007, 0 },
27 { X86_FEATURE_CAT_L3
, CPUID_EBX
, 1, 0x00000010, 0 },
28 { X86_FEATURE_CAT_L2
, CPUID_EBX
, 2, 0x00000010, 0 },
29 { X86_FEATURE_CDP_L3
, CPUID_ECX
, 2, 0x00000010, 1 },
30 { X86_FEATURE_MBA
, CPUID_EBX
, 3, 0x00000010, 0 },
31 { X86_FEATURE_HW_PSTATE
, CPUID_EDX
, 7, 0x80000007, 0 },
32 { X86_FEATURE_CPB
, CPUID_EDX
, 9, 0x80000007, 0 },
33 { X86_FEATURE_PROC_FEEDBACK
, CPUID_EDX
, 11, 0x80000007, 0 },
34 { X86_FEATURE_SME
, CPUID_EAX
, 0, 0x8000001f, 0 },
38 void init_scattered_cpuid_features(struct cpuinfo_x86
*c
)
42 const struct cpuid_bit
*cb
;
44 for (cb
= cpuid_bits
; cb
->feature
; cb
++) {
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))
52 cpuid_count(cb
->level
, cb
->sub_leaf
, ®s
[CPUID_EAX
],
53 ®s
[CPUID_EBX
], ®s
[CPUID_ECX
],
56 if (regs
[cb
->reg
] & (1 << cb
->bit
))
57 set_cpu_cap(c
, cb
->feature
);
61 u32
get_scattered_cpuid_leaf(unsigned int level
, unsigned int sub_leaf
,
62 enum cpuid_regs_idx reg
)
64 const struct cpuid_bit
*cb
;
67 for (cb
= cpuid_bits
; cb
->feature
; cb
++) {
69 if (level
> cb
->level
)
72 if (level
< cb
->level
)
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
);
83 EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf
);