LXR linux/arch/x86/kernel/cpu/scattered.c

   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_DTS,              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_NPT,              CR_EDX, 0, 0x8000000a, 0 },
  44                { X86_FEATURE_LBRV,             CR_EDX, 1, 0x8000000a, 0 },
  45                { X86_FEATURE_SVML,             CR_EDX, 2, 0x8000000a, 0 },
  46                { X86_FEATURE_NRIPS,            CR_EDX, 3, 0x8000000a, 0 },
  47                { X86_FEATURE_TSCRATEMSR,       CR_EDX, 4, 0x8000000a, 0 },
  48                { X86_FEATURE_VMCBCLEAN,        CR_EDX, 5, 0x8000000a, 0 },
  49                { X86_FEATURE_FLUSHBYASID,      CR_EDX, 6, 0x8000000a, 0 },
  50                { X86_FEATURE_DECODEASSISTS,    CR_EDX, 7, 0x8000000a, 0 },
  51                { X86_FEATURE_PAUSEFILTER,      CR_EDX,10, 0x8000000a, 0 },
  52                { X86_FEATURE_PFTHRESHOLD,      CR_EDX,12, 0x8000000a, 0 },
  53                { 0, 0, 0, 0, 0 }
  54        };
  55
  56        for (cb = cpuid_bits; cb->feature; cb++) {
  57
  58                /* Verify that the level is valid */
  59                max_level = cpuid_eax(cb->level & 0xffff0000);
  60                if (max_level < cb->level ||
  61                    max_level > (cb->level | 0xffff))
  62                        continue;
  63
  64                cpuid_count(cb->level, cb->sub_leaf, &regs[CR_EAX],
  65                            &regs[CR_EBX], &regs[CR_ECX], &regs[CR_EDX]);
  66
  67                if (regs[cb->reg] & (1 << cb->bit))
  68                        set_cpu_cap(c, cb->feature);
  69        }
  70}
  71