Contributors: 13
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| H. Peter Anvin |
173 |
50.00% |
1 |
6.25% |
| He Chen |
40 |
11.56% |
2 |
12.50% |
| Fenghua Yu |
36 |
10.40% |
2 |
12.50% |
| Tom Lendacky |
24 |
6.94% |
2 |
12.50% |
| Sherry Hurwitz |
13 |
3.76% |
1 |
6.25% |
| Jacob Shin |
13 |
3.76% |
1 |
6.25% |
| Vikas Shivappa |
12 |
3.47% |
1 |
6.25% |
| Piotr Luc |
10 |
2.89% |
1 |
6.25% |
| Thomas Renninger |
9 |
2.60% |
1 |
6.25% |
| Alexander Shishkin |
8 |
2.31% |
1 |
6.25% |
| Borislav Petkov |
4 |
1.16% |
1 |
6.25% |
| Thomas Gleixner |
3 |
0.87% |
1 |
6.25% |
| Maxime Jayat |
1 |
0.29% |
1 |
6.25% |
| Total |
346 |
|
16 |
|
/*
* Routines to identify additional cpu features that are scattered in
* cpuid space.
*/
#include <linux/cpu.h>
#include <asm/pat.h>
#include <asm/apic.h>
#include <asm/processor.h>
#include "cpu.h"
struct cpuid_bit {
u16 feature;
u8 reg;
u8 bit;
u32 level;
u32 sub_leaf;
};
/*
* Please keep the leaf sorted by cpuid_bit.level for faster search.
* X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID
* levels are different and there is a separate entry for each.
*/
static const struct cpuid_bit cpuid_bits[] = {
{ X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 },
{ X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 },
{ X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 },
{ X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 },
{ X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 },
{ X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 },
{ X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
{ X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
{ X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 },
{ X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
{ X86_FEATURE_SEV, CPUID_EAX, 1, 0x8000001f, 0 },
{ 0, 0, 0, 0, 0 }
};
void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
{
u32 max_level;
u32 regs[4];
const struct cpuid_bit *cb;
for (cb = cpuid_bits; cb->feature; cb++) {
/* Verify that the level is valid */
max_level = cpuid_eax(cb->level & 0xffff0000);
if (max_level < cb->level ||
max_level > (cb->level | 0xffff))
continue;
cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX],
®s[CPUID_EBX], ®s[CPUID_ECX],
®s[CPUID_EDX]);
if (regs[cb->reg] & (1 << cb->bit))
set_cpu_cap(c, cb->feature);
}
}