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_AVX512_4VNNIW, CPUID_EDX, 2, 0x00000007, 0 },
25 { X86_FEATURE_AVX512_4FMAPS, CPUID_EDX, 3, 0x00000007, 0 },
26 { X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 },
27 { X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 },
28 { X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 },
29 { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
30 { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
31 { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
32 { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
33 { X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
37 void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
41 const struct cpuid_bit *cb;
43 for (cb = cpuid_bits; cb->feature; cb++) {
45 /* Verify that the level is valid */
46 max_level = cpuid_eax(cb->level & 0xffff0000);
47 if (max_level < cb->level ||
48 max_level > (cb->level | 0xffff))
51 cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX],
52 ®s[CPUID_EBX], ®s[CPUID_ECX],
55 if (regs[cb->reg] & (1 << cb->bit))
56 set_cpu_cap(c, cb->feature);
60 u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf,
61 enum cpuid_regs_idx reg)
63 const struct cpuid_bit *cb;
66 for (cb = cpuid_bits; cb->feature; cb++) {
68 if (level > cb->level)
71 if (level < cb->level)
74 if (reg == cb->reg && sub_leaf == cb->sub_leaf) {
75 if (cpu_has(&boot_cpu_data, cb->feature))
76 cpuid_val |= BIT(cb->bit);
82 EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf);