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_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
28 { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
29 { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
33 void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
37 const struct cpuid_bit *cb;
39 for (cb = cpuid_bits; cb->feature; cb++) {
41 /* Verify that the level is valid */
42 max_level = cpuid_eax(cb->level & 0xffff0000);
43 if (max_level < cb->level ||
44 max_level > (cb->level | 0xffff))
47 cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX],
48 ®s[CPUID_EBX], ®s[CPUID_ECX],
51 if (regs[cb->reg] & (1 << cb->bit))
52 set_cpu_cap(c, cb->feature);
56 u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf,
57 enum cpuid_regs_idx reg)
59 const struct cpuid_bit *cb;
62 for (cb = cpuid_bits; cb->feature; cb++) {
64 if (level > cb->level)
67 if (level < cb->level)
70 if (reg == cb->reg && sub_leaf == cb->sub_leaf) {
71 if (cpu_has(&boot_cpu_data, cb->feature))
72 cpuid_val |= BIT(cb->bit);
78 EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf);