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kernel: x86: add some more cpuid flags.

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This commit is contained in:
Jérôme Duval 2018-01-15 20:11:55 +01:00
parent 05a859ebd7
commit 483c45843d
2 changed files with 18 additions and 1 deletions
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7
headers/private/kernel/arch/x86/arch_cpu.h
View File

@ -261,11 +261,17 @@
// https://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features
#define IA32_FEATURE_AVX512_4VNNIW (1 << 2) // AVX-512 4-register Neural Network Instructions
#define IA32_FEATURE_AVX512_4FMAPS (1 << 3) // AVX-512 4-register Multiply Accumulation Single precision
#define IA32_FEATURE_IBRS (1 << 26) // IBRS / IBPB Speculation Control
#define IA32_FEATURE_STIBP (1 << 27) // STIBP Speculation Control
// x86 defined features from cpuid eax 0x80000007, edx register
#define IA32_FEATURE_INVARIANT_TSC (1 << 8)
// x86 defined features from cpuid eax 0x80000008, ebx register
#define IA32_FEATURE_AMD_EXT_IBPB (1 << 12) /* IBPB Support only (no IBRS) */
// cr4 flags
#define IA32_CR4_PAE (1UL << 5)
#define IA32_CR4_GLOBAL_PAGES (1UL << 7)
@ -355,6 +361,7 @@ enum x86_feature_type {
FEATURE_7_ECX, // cpuid eax=7, ecx registers
FEATURE_7_EDX, // cpuid eax=7, edx registers
FEATURE_EXT_7_EDX, // cpuid eax=0x80000007, edx register
FEATURE_EXT_8_EBX, // cpuid eax=0x80000008, ebx register
FEATURE_NUM
};

12
src/system/kernel/arch/x86/arch_cpu.cpp
View File

@ -536,7 +536,12 @@ dump_feature_string(int currentCPU, cpu_ent* cpu)
strlcat(features, "avx512bw ", sizeof(features));
if (cpu->arch.feature[FEATURE_7_EBX] & IA32_FEATURE_AVX512VI)
strlcat(features, "avx512vi ", sizeof(features));
if (cpu->arch.feature[FEATURE_7_EDX] & IA32_FEATURE_IBRS)
strlcat(features, "ibrs ", sizeof(features));
if (cpu->arch.feature[FEATURE_7_EDX] & IA32_FEATURE_STIBP)
strlcat(features, "stibp ", sizeof(features));
if (cpu->arch.feature[FEATURE_EXT_8_EBX] & IA32_FEATURE_AMD_EXT_IBPB)
strlcat(features, "ibpb ", sizeof(features));
dprintf("CPU %d: features: %s\n", currentCPU, features);
}
#endif // DUMP_FEATURE_STRING
@ -989,6 +994,11 @@ detect_cpu(int currentCPU)
cpu->arch.feature[FEATURE_EXT_7_EDX] = cpuid.regs.edx;
}
if (maxExtendedLeaf >= 0x80000008) {
get_current_cpuid(&cpuid, 0x80000008, 0);
cpu->arch.feature[FEATURE_EXT_8_EBX] = cpuid.regs.ebx;
}
detect_cpu_topology(currentCPU, cpu, maxBasicLeaf, maxExtendedLeaf);
#if DUMP_FEATURE_STRING