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Read previously identified CPU features from PRCB
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This commit is contained in:
Aiken Harris
2026-05-15 11:33:23 +02:00
parent efff262fb5
commit 38b2e7a1ed
1 changed files with 12 additions and 105 deletions
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117
xtoskrnl/hl/x86/timer.cc
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@@ -925,84 +925,31 @@ XTAPI
VOID
HL::Timer::QueryTimerCapabilities(VOID)
{
PKPROCESSOR_CONTROL_BLOCK Prcb;
CPUID_REGISTERS CpuRegisters;
ULONG MaxStandardLeaf;
ULONG MaxExtendedLeaf;
/* Get current processor control block */
Prcb = KE::Processor::GetCurrentProcessorControlBlock();
/* Set timer capabilities based on supported CPU features */
TimerCapabilities.Arat = (Prcb->CpuId.FeatureBits & KCF_ARAT) != 0;
TimerCapabilities.InvariantTsc= (Prcb->CpuId.ExtendedFeatureBits & KCF_INVARIANT_TSC) != 0;
TimerCapabilities.RDTSCP = (Prcb->CpuId.ExtendedFeatureBits & KCF_RDTSCP) != 0;
TimerCapabilities.TscDeadline = (Prcb->CpuId.FeatureBits & KCF_TSC_DEADLINE) != 0;
/* Query maximum standard CPUID leaf */
RTL::Memory::ZeroMemory(&CpuRegisters, sizeof(CPUID_REGISTERS));
CpuRegisters.Leaf = CPUID_GET_VENDOR_STRING;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Save maximum supported standard CPUID leaf */
MaxStandardLeaf = CpuRegisters.Eax;
/* Query maximum extended CPUID leaf */
CpuRegisters.Leaf = CPUID_GET_EXTENDED_MAX;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Save maximum supported extended CPUID leaf */
MaxExtendedLeaf = CpuRegisters.Eax;
/* Check TSC-Deadline mode if leaf supported */
if(MaxStandardLeaf >= CPUID_GET_STANDARD1_FEATURES)
{
/* Query the standard feature CPUI leaf */
CpuRegisters.Leaf = CPUID_GET_STANDARD1_FEATURES;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Verify TSC-Deadline support */
if(CpuRegisters.Ecx & CPUID_FEATURES_ECX_TSC_DEADLINE)
{
/* Mark the TSC-Deadline mode as supported */
TimerCapabilities.TscDeadline = TRUE;
}
}
/* Check Always Running APIC Timer - ARAT if leaf supported */
if(MaxStandardLeaf >= CPUID_GET_POWER_MANAGEMENT)
{
/* Query the thermal and power management features CPUID leaf */
CpuRegisters.Leaf = CPUID_GET_POWER_MANAGEMENT;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Verify Always Running APIC Timer support */
if(CpuRegisters.Eax & CPUID_FEATURES_EAX_ARAT)
{
/* Mark the ARAT as supported */
TimerCapabilities.Arat = TRUE;
}
}
/* Check Always Running Timer - ART if leaf supported */
if(MaxStandardLeaf >= CPUID_GET_TSC_CRYSTAL_CLOCK)
{
/* Query the Time Stamp Counter and Core Crystal Clock information CPUID leaf */
RTL::Memory::ZeroMemory(&CpuRegisters, sizeof(CPUID_REGISTERS));
CpuRegisters.Leaf = CPUID_GET_TSC_CRYSTAL_CLOCK;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Verify Always Running Timer support */
@@ -1023,46 +970,6 @@ HL::Timer::QueryTimerCapabilities(VOID)
}
}
}
/* Check RDTSCP instruction support if leaf supported */
if(MaxExtendedLeaf >= CPUID_GET_EXTENDED_FEATURES)
{
/* Query the extended processor features CPUID leaf */
CpuRegisters.Leaf = CPUID_GET_EXTENDED_FEATURES;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Verify RDTSCP support */
if(CpuRegisters.Edx & CPUID_FEATURES_EDX_RDTSCP)
{
/* Mark the RDTSCP instruction as supported */
TimerCapabilities.RDTSCP = TRUE;
}
}
/* Check Invariant TSC if leaf supported */
if(MaxExtendedLeaf >= CPUID_GET_ADVANCED_POWER_MANAGEMENT)
{
/* Query the advanced power management features CPUID leaf */
CpuRegisters.Leaf = CPUID_GET_ADVANCED_POWER_MANAGEMENT;
CpuRegisters.SubLeaf = 0;
CpuRegisters.Eax = 0;
CpuRegisters.Ebx = 0;
CpuRegisters.Ecx = 0;
CpuRegisters.Edx = 0;
AR::CpuFunc::CpuId(&CpuRegisters);
/* Verify Invariant TSC support */
if(CpuRegisters.Edx & CPUID_FEATURES_EDX_TSCI)
{
/* Mark the Invariant TSC feature as supported */
TimerCapabilities.InvariantTsc = TRUE;
}
}
}
/**