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detect hyper-threading, determine number of logical processors per phyiscal processor and it's apic id

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svn path=/trunk/; revision=13864
This commit is contained in:
Thomas Bluemel 2005-03-07 00:35:49 +00:00
parent f05c21fa3a
commit bdf10ff3ff
2 changed files with 19 additions and 4 deletions
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1
reactos/ntoskrnl/include/internal/i386/ke.h
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@ -99,6 +99,7 @@
#define X86_FEATURE_FXSR 0x01000000 /* FXSAVE/FXRSTOR instructions present */
#define X86_FEATURE_SSE 0x02000000 /* SSE extension present */
#define X86_FEATURE_SSE2 0x04000000 /* SSE2 extension present */
#define X86_FEATURE_HT 0x10000000 /* Hyper-Threading present */
#define X86_EXT_FEATURE_SSE3 0x00000001 /* SSE3 extension present */
#define X86_EXT_FEATURE_3DNOW 0x40000000 /* 3DNOW! extension present */

22
reactos/ntoskrnl/ke/i386/kernel.c
View file

@ -18,7 +18,7 @@
ULONG KiPcrInitDone = 0;
static ULONG PcrsAllocated = 0;
static ULONG Ke386CpuidFlags2, Ke386CpuidExFlags;
static ULONG Ke386CpuidFlags2, Ke386CpuidExFlags, Ke386CpuidExMisc;
ULONG Ke386CacheAlignment;
CHAR Ke386CpuidModel[49] = {0,};
ULONG Ke386L1CacheSize;
@ -34,7 +34,7 @@ Ki386GetCpuId(VOID)
{
ULONG OrigFlags, Flags, FinalFlags;
ULONG MaxCpuidLevel;
ULONG Dummy, Eax, Ebx, Ecx, Edx;
ULONG Dummy, Eax, Ecx, Edx;
PKPCR Pcr = KeGetCurrentKPCR();
Ke386CpuidFlags2 = Ke386CpuidExFlags = 0;
@ -45,6 +45,10 @@ Ki386GetCpuId(VOID)
Flags = OrigFlags ^ X86_EFLAGS_ID;
Ke386RestoreFlags(Flags);
Ke386SaveFlags(FinalFlags);
Pcr->PrcbData.LogicalProcessorsPerPhysicalProcessor = 1;
Pcr->PrcbData.InitialApicId = 0xff;
if ((OrigFlags & X86_EFLAGS_ID) == (FinalFlags & X86_EFLAGS_ID))
{
/* No cpuid supported. */
@ -59,14 +63,24 @@ Ki386GetCpuId(VOID)
if (MaxCpuidLevel > 0)
{
/* Get the feature flags. */
Ki386Cpuid(1, &Eax, &Ebx, &Ke386CpuidFlags2, &Pcr->PrcbData.FeatureBits);
Ki386Cpuid(1, &Eax, &Ke386CpuidExMisc, &Ke386CpuidFlags2, &Pcr->PrcbData.FeatureBits);
/* Get the cache alignment, if it is available */
if (Pcr->PrcbData.FeatureBits & (1<<19))
{
Ke386CacheAlignment = ((Ebx >> 8) & 0xff) * 8;
Ke386CacheAlignment = ((Ke386CpuidExMisc >> 8) & 0xff) * 8;
}
Pcr->PrcbData.CpuType = (Eax >> 8) & 0xf;
Pcr->PrcbData.CpuStep = (Eax & 0xf) | ((Eax << 4) & 0xf00);
Pcr->PrcbData.InitialApicId = (Ke386CpuidExMisc >> 24) & 0xff;
/* detect Hyper-Threading on Pentium 4 CPUs or later */
if ((Pcr->PrcbData.CpuType == 0xf || (Eax & 0x0f00000)) &&
!strncmp(Pcr->PrcbData.VendorString, "GenuineIntel", 12) &&
Pcr->PrcbData.FeatureBits & X86_FEATURE_HT)
{
Pcr->PrcbData.LogicalProcessorsPerPhysicalProcessor = (Ke386CpuidExMisc >> 16) & 0xff;
}
}
else
{