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[NTOS/KE]

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- Remove VirtualBox SYSENTER-hack added in r50991.
- Bring back NT-compatible SYSENTER support detection changed in r50991.

svn path=/trunk/; revision=51120
This commit is contained in:
Aleksey Bragin 2011-03-22 16:35:51 +00:00
parent 4fb00286d5
commit cc6c8e90e2
1 changed files with 3 additions and 10 deletions
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13
reactos/ntoskrnl/ke/i386/cpu.c
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@ -304,16 +304,9 @@ KiGetFeatureBits(VOID)
FeatureBits &= ~KF_WORKING_PTE; FeatureBits &= ~KF_WORKING_PTE;
} }
/* Virtualbox claims to have no SYSENTER support, /* Check if the CPU is too old to support SYSENTER */
* which is false for processors >= Pentium Pro */ if ((Prcb->CpuType < 6) ||
if(Prcb->CpuType >= 6) ((Prcb->CpuType == 6) && (Prcb->CpuStep < 0x0303)))
{
Reg[3] |= 0x800;
}
/* Check if the CPU is too old to support SYSENTER,
* See Intel CPUID instruction manual for details*/
if ((Reg[0] & 0x0FFF3FFF) < 0x00000633)
{ {
/* Disable it */ /* Disable it */
Reg[3] &= ~0x800; Reg[3] &= ~0x800;