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- Hack FPU handler. 2nd stage installation now works if you had a crash, as well as any other crash where your trace indidicated one of the following: "CoordLpToDP", "KiHandleFpuFault".

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svn path=/trunk/; revision=23290
This commit is contained in:
Alex Ionescu 2006-07-25 19:49:53 +00:00
parent b1961cb16c
commit a9183e6f8f
1 changed files with 2 additions and 71 deletions
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73
reactos/ntoskrnl/ke/i386/fpu.c
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@ -363,14 +363,11 @@ KiHandleFpuFault(PKTRAP_FRAME Tf, ULONG ExceptionNr)
{
if (ExceptionNr == 7) /* device not present */
{
BOOL FpuInitialized = FALSE;
//BOOL FpuInitialized = FALSE;
unsigned int cr0 = Ke386GetCr0();
PKTHREAD CurrentThread;
PFX_SAVE_AREA FxSaveArea;
//PFX_SAVE_AREA FxSaveArea;
KIRQL oldIrql;
#ifndef CONFIG_SMP
PKTHREAD NpxThread;
#endif
(void) cr0;
ASSERT((cr0 & X86_CR0_TS) == X86_CR0_TS);
@ -383,73 +380,7 @@ KiHandleFpuFault(PKTRAP_FRAME Tf, ULONG ExceptionNr)
asm volatile("clts");
CurrentThread = KeGetCurrentThread();
#ifndef CONFIG_SMP
NpxThread = KeGetCurrentPrcb()->NpxThread;
#endif
ASSERT(CurrentThread != NULL);
DPRINT("Device not present exception happened! (Cr0 = 0x%x, NpxState = 0x%x)\n", cr0, CurrentThread->NpxState);
#ifndef CONFIG_SMP
/* check if the current thread already owns the FPU */
if (NpxThread != CurrentThread) /* FIXME: maybe this could be an assertation */
{
/* save the FPU state into the owner's save area */
if (NpxThread != NULL)
{
KeGetCurrentPrcb()->NpxThread = NULL;
FxSaveArea = (PFX_SAVE_AREA)((ULONG_PTR)NpxThread->InitialStack - sizeof (FX_SAVE_AREA));
/* the fnsave might raise a delayed #MF exception */
if (KeI386FxsrPresent)
{
asm volatile("fxsave %0" : : "m"(FxSaveArea->U.FxArea));
}
else
{
asm volatile("fnsave %0" : : "m"(FxSaveArea->U.FnArea));
FpuInitialized = TRUE;
}
NpxThread->NpxState = NPX_STATE_VALID;
}
#endif /* !CONFIG_SMP */
/* restore the state of the current thread */
ASSERT((CurrentThread->NpxState & NPX_STATE_DIRTY) == 0);
FxSaveArea = (PFX_SAVE_AREA)((ULONG_PTR)CurrentThread->InitialStack - sizeof (FX_SAVE_AREA));
if (CurrentThread->NpxState & NPX_STATE_VALID)
{
if (KeI386FxsrPresent)
{
FxSaveArea->U.FxArea.MXCsr &= MxcsrFeatureMask;
asm volatile("fxrstor %0" : : "m"(FxSaveArea->U.FxArea));
}
else
{
asm volatile("frstor %0" : : "m"(FxSaveArea->U.FnArea));
}
}
else /* NpxState & NPX_STATE_INVALID */
{
DPRINT("Setting up clean FPU state\n");
if (KeI386FxsrPresent)
{
memset(&FxSaveArea->U.FxArea, 0, sizeof(FxSaveArea->U.FxArea));
FxSaveArea->U.FxArea.ControlWord = 0x037f;
if (KeI386XMMIPresent)
{
FxSaveArea->U.FxArea.MXCsr = 0x00001f80 & MxcsrFeatureMask;
}
asm volatile("fxrstor %0" : : "m"(FxSaveArea->U.FxArea));
}
else if (!FpuInitialized)
{
asm volatile("fninit");
}
}
KeGetCurrentPrcb()->NpxThread = CurrentThread;
#ifndef CONFIG_SMP
}
#endif
CurrentThread->NpxState |= NPX_STATE_DIRTY;
KeLowerIrql(oldIrql);