2 * Routines to identify additional cpu features that are scattered in
9 #include <asm/processor.h>
22 * Please keep the leaf sorted by cpuid_bit.level for faster search.
23 * X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID
24 * levels are different and there is a separate entry for each.
26 static const struct cpuid_bit cpuid_bits[] = {
27 { X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 },
28 { X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 },
29 { X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 },
30 { X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 },
31 { X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 },
32 { X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 },
33 { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
34 { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
35 { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
36 { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
37 { X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 },
38 { X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
39 { X86_FEATURE_SEV, CPUID_EAX, 1, 0x8000001f, 0 },
43 void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
47 const struct cpuid_bit *cb;
49 for (cb = cpuid_bits; cb->feature; cb++) {
51 /* Verify that the level is valid */
52 max_level = cpuid_eax(cb->level & 0xffff0000);
53 if (max_level < cb->level ||
54 max_level > (cb->level | 0xffff))
57 cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX],
58 ®s[CPUID_EBX], ®s[CPUID_ECX],
61 if (regs[cb->reg] & (1 << cb->bit))
62 set_cpu_cap(c, cb->feature);