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[NTOS:KE] Add a check for unsupported CPU features on i586

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Currently, these features are vital for the kernel:
- CPUID instruction
- CMPXCHG8B instruction
- TSC aka Time Stamp Counter

All of that have to be present on i586
This commit is contained in:
Victor Perevertkin 2022-01-15 03:42:59 +03:00
parent 705e07ce31
commit 1aca6937ff
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GPG key ID: C750B7222E9C7830
1 changed files with 53 additions and 22 deletions
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75
ntoskrnl/ke/i386/kiinit.c
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@ -397,38 +397,69 @@ CODE_SEG("INIT")
VOID
KiVerifyCpuFeatures(PKPRCB Prcb)
{
ULONG FeatureBits;
CPU_INFO CpuInfo;
/* Detect and set the CPU Type */
// 1. Check CPUID support
ULONG EFlags = __readeflags();
/* XOR out the ID bit and update EFlags */
ULONG NewEFlags = EFlags ^ EFLAGS_ID;
__writeeflags(NewEFlags);
/* Get them back and see if they were modified */
NewEFlags = __readeflags();
if (NewEFlags == EFlags)
{
/* The modification did not work, so CPUID is not supported. */
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x1, 0, 0, 0);
}
else
{
/* CPUID is supported. Set the ID Bit again. */
EFlags |= EFLAGS_ID;
__writeeflags(EFlags);
}
/* Peform CPUID 0 to see if CPUID 1 is supported */
KiCpuId(&CpuInfo, 0);
if (CpuInfo.Eax == 0)
{
// 0x1 - missing CPUID instruction
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x1, 0, 0, 0);
}
// 2. Detect and set the CPU Type
KiSetProcessorType();
/* Check if an FPU is present */
KeI386NpxPresent = KiIsNpxPresent();
/* Bugcheck if this is a 386 CPU */
if (Prcb->CpuType == 3)
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x386, 0, 0, 0);
/* Get the processor features for the CPU */
FeatureBits = KiGetFeatureBits();
// 3. Finally, obtain CPU features.
ULONG FeatureBits = KiGetFeatureBits();
/* Detect 8-byte compare exchange support */
if (!(FeatureBits & KF_CMPXCHG8B))
// 4. Verify it supports everything we need.
if (!(FeatureBits & KF_RDTSC))
{
ULONG Vendor[3];
/* Copy the vendor string */
RtlCopyMemory(Vendor, Prcb->VendorString, sizeof(Vendor));
/* Bugcheck the system. Windows *requires* this */
KeBugCheckEx(UNSUPPORTED_PROCESSOR,
(1 << 24 ) | (Prcb->CpuType << 16) | Prcb->CpuStep,
Vendor[0],
Vendor[1],
Vendor[2]);
// 0x2 - missing CPUID features
// second paramenter - edx flag which is missing
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x2, 0x00000010, 0, 0);
}
/* Save feature bits */
if (!(FeatureBits & KF_CMPXCHG8B))
{
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x2, 0x00000100, 0, 0);
}
// Check x87 FPU is present. FIXME: put this into FeatureBits?
KiCpuId(&CpuInfo, 1);
if (!(CpuInfo.Edx & 0x00000001))
{
KeBugCheckEx(UNSUPPORTED_PROCESSOR, 0x2, 0x00000001, 0, 0);
}
// 5. Save feature bits.
Prcb->FeatureBits = FeatureBits;
}