1/*
2 *	Routines to indentify additional cpu features that are scattered in
3 *	cpuid space.
4 */
5#include <linux/cpu.h>
6
7#include <asm/pat.h>
8#include <asm/processor.h>
9
10#include <asm/apic.h>
11
12struct cpuid_bit {
13	u16 feature;
14	u8 reg;
15	u8 bit;
16	u32 level;
17	u32 sub_leaf;
18};
19
20enum cpuid_regs {
21	CR_EAX = 0,
22	CR_ECX,
23	CR_EDX,
24	CR_EBX
25};
26
27void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
28{
29	u32 max_level;
30	u32 regs[4];
31	const struct cpuid_bit *cb;
32
33	static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {
34		{ X86_FEATURE_DTHERM,		CR_EAX, 0, 0x00000006, 0 },
35		{ X86_FEATURE_IDA,		CR_EAX, 1, 0x00000006, 0 },
36		{ X86_FEATURE_ARAT,		CR_EAX, 2, 0x00000006, 0 },
37		{ X86_FEATURE_PLN,		CR_EAX, 4, 0x00000006, 0 },
38		{ X86_FEATURE_PTS,		CR_EAX, 6, 0x00000006, 0 },
39		{ X86_FEATURE_APERFMPERF,	CR_ECX, 0, 0x00000006, 0 },
40		{ X86_FEATURE_EPB,		CR_ECX, 3, 0x00000006, 0 },
41		{ X86_FEATURE_XSAVEOPT,		CR_EAX,	0, 0x0000000d, 1 },
42		{ X86_FEATURE_CPB,		CR_EDX, 9, 0x80000007, 0 },
43		{ X86_FEATURE_HW_PSTATE,	CR_EDX, 7, 0x80000007, 0 },
44		{ X86_FEATURE_NPT,		CR_EDX, 0, 0x8000000a, 0 },
45		{ X86_FEATURE_LBRV,		CR_EDX, 1, 0x8000000a, 0 },
46		{ X86_FEATURE_SVML,		CR_EDX, 2, 0x8000000a, 0 },
47		{ X86_FEATURE_NRIPS,		CR_EDX, 3, 0x8000000a, 0 },
48		{ X86_FEATURE_TSCRATEMSR,	CR_EDX, 4, 0x8000000a, 0 },
49		{ X86_FEATURE_VMCBCLEAN,	CR_EDX, 5, 0x8000000a, 0 },
50		{ X86_FEATURE_FLUSHBYASID,	CR_EDX, 6, 0x8000000a, 0 },
51		{ X86_FEATURE_DECODEASSISTS,	CR_EDX, 7, 0x8000000a, 0 },
52		{ X86_FEATURE_PAUSEFILTER,	CR_EDX,10, 0x8000000a, 0 },
53		{ X86_FEATURE_PFTHRESHOLD,	CR_EDX,12, 0x8000000a, 0 },
54		{ 0, 0, 0, 0, 0 }
55	};
56
57	for (cb = cpuid_bits; cb->feature; cb++) {
58
59		/* Verify that the level is valid */
60		max_level = cpuid_eax(cb->level & 0xffff0000);
61		if (max_level < cb->level ||
62		    max_level > (cb->level | 0xffff))
63			continue;
64
65		cpuid_count(cb->level, cb->sub_leaf, &regs[CR_EAX],
66			    &regs[CR_EBX], &regs[CR_ECX], &regs[CR_EDX]);
67
68		if (regs[cb->reg] & (1 << cb->bit))
69			set_cpu_cap(c, cb->feature);
70	}
71}
72