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modified ke/i386/cpu.c

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Added CMPXCHG8B enabling/detection code for TransMeta, Centaur and Rise (source: <URL: http://www.geoffchappell.com/notes/windows/kernel/cpu/cx8.htm>). Code dead until each vendor will be officially supported
   Alex and others: please review

svn path=/trunk/; revision=36610
This commit is contained in:
KJK::Hyperion 2008-10-01 11:54:29 +00:00
parent ac197ef4f3
commit 58fef1577f
1 changed files with 40 additions and 0 deletions
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40
reactos/ntoskrnl/ke/i386/cpu.c
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@ -353,6 +353,46 @@ KiGetFeatureBits(VOID)
CpuFeatures = Reg[3];
}
#ifdef CPU_TRANSMETA
if (Vendor == CPU_TRANSMETA)
{
/* Enable CMPXCHG8B if the family (>= 5), model and stepping (>= 4.2) support it */
if ((Reg[0] & 0x0F00) >= 0x0500 && (Reg[0] & 0x00FF) >= 0x0042)
{
WRMSR(0x80860004, RDMSR(0x80860004) | 0x0100);
FeatureBits |= KF_CMPXCHG8B;
}
}
#endif
#ifdef CPU_CENTAUR
if (Vendor == CPU_CENTAUR)
{
/* If CMPXCHG8B is not detected, try to enable it */
if (!(CpuFeatures & 0x00000100))
{
if ((Reg[0] & 0x0F00) == 0x0500)
{
WRMSR(0x0107, RDMSR(0x0107) | 0x02);
FeatureBits |= KF_CMPXCHG8B;
}
else if ((Reg[0] & 0x0F00) >= 0x0600)
{
WRMSR(0x1107, (RDMSR(0x1107) | 0x02) & ~((LONGLONG)0x01));
FeatureBits |= KF_CMPXCHG8B;
}
}
}
#endif
#ifdef CPU_RISE
if (Vendor == CPU_RISE)
{
/* Windows Vista assumes CMPXCHG8B is always supported on Rise */
FeatureBits |= KF_CMPXCHG8B;
}
#endif
/* Convert all CPUID Feature bits into our format */
if (CpuFeatures & 0x00000002) FeatureBits |= KF_V86_VIS | KF_CR4;
if (CpuFeatures & 0x00000008) FeatureBits |= KF_LARGE_PAGE | KF_CR4;