2 * Routines to identify additional cpu features that are scattered in
8 #include <asm/processor.h>
27 void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
31 const struct cpuid_bit *cb;
33 static const struct cpuid_bit cpuid_bits[] = {
34 { X86_FEATURE_INTEL_PT, CR_EBX,25, 0x00000007, 0 },
35 { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 },
36 { X86_FEATURE_EPB, CR_ECX, 3, 0x00000006, 0 },
37 { X86_FEATURE_HW_PSTATE, CR_EDX, 7, 0x80000007, 0 },
38 { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
39 { X86_FEATURE_PROC_FEEDBACK, CR_EDX,11, 0x80000007, 0 },
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[CR_EAX],
52 ®s[CR_EBX], ®s[CR_ECX], ®s[CR_EDX]);
54 if (regs[cb->reg] & (1 << cb->bit))
55 set_cpu_cap(c, cb->feature);