Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-02-22 08:25:03 +00:00
Code Issues Projects Releases Packages Wiki Activity

[NTOSKRNL]

Browse source 
- Print supported CPU features.
  - Simplify detection of non working but claimed SYSENTER support for intel processors
  - Workaround a virtualbox "feature" : claim that SYSENTER isn't supported despite the fact that it is.
Fix hang on registration of mshtml.dll in 2nd stage when using Virtualbox.

svn path=/trunk/; revision=50991
This commit is contained in:
Jérôme Gardou 2011-03-07 13:33:10 +00:00
parent 527622e72f
commit acd7f5a3da
1 changed files with 34 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
reactos/ntoskrnl/ke/i386/cpu.c
View file

@ -303,10 +303,16 @@ KiGetFeatureBits(VOID)
/* Remove support for correct PTE support. */
FeatureBits &= ~KF_WORKING_PTE;
}
/* Virtualbox claims to have no SYSENTER support,
* which is false for processors >= Pentium Pro */
if(Prcb->CpuType >= 6)
{
Reg[3] |= 0x800;
}
/* Check if the CPU is too old to support SYSENTER */
if ((Prcb->CpuType < 6) ||
((Prcb->CpuType == 6) && (Prcb->CpuStep < 0x0303)))
if ((Reg[0] & 0x0FFF3FFF) < 0x00000633)
{
/* Disable it */
Reg[3] &= ~0x800;
@ -474,6 +480,32 @@ KiGetFeatureBits(VOID)
}
}
}
DPRINT1("Supported CPU features :\n");
#define print_supported(kf_value) \
if(FeatureBits & kf_value) DPRINT1("\t" #kf_value "\n")
print_supported(KF_V86_VIS);
print_supported(KF_RDTSC);
print_supported(KF_CR4);
print_supported(KF_CMOV);
print_supported(KF_GLOBAL_PAGE);
print_supported(KF_LARGE_PAGE);
print_supported(KF_MTRR);
print_supported(KF_CMPXCHG8B);
print_supported(KF_MMX);
print_supported(KF_WORKING_PTE);
print_supported(KF_PAT);
print_supported(KF_FXSR);
print_supported(KF_FAST_SYSCALL);
print_supported(KF_XMMI);
print_supported(KF_3DNOW);
print_supported(KF_AMDK6MTRR);
print_supported(KF_XMMI64);
print_supported(KF_DTS);
print_supported(KF_NX_BIT);
print_supported(KF_NX_DISABLED);
print_supported(KF_NX_ENABLED);
#undef print_supported
/* Return the Feature Bits */
return FeatureBits;