/* Set the EFLAGS */
Context->EFlags = 0x3000 | EFLAGS_INTERRUPT_MASK; /* IOPL 3 */
+ /* Set MXCSR */
+ Context->MxCsr = INITIAL_MXCSR;
+
if (ContextType == 1) /* For Threads */
{
Context->Rip = (ULONG_PTR)BaseThreadStartup;
}
/* Handle floating point registers */
- if ((ContextFlags & CONTEXT_FLOATING_POINT))
+ if (ContextFlags & CONTEXT_FLOATING_POINT)
{
TrapFrame->MxCsr = Context->MxCsr;
TrapFrame->Xmm0 = Context->Xmm0;
}
/* Handle floating point registers */
- if ((ContextFlags & CONTEXT_FLOATING_POINT) &&
- ((TrapFrame->SegCs & MODE_MASK) != KernelMode))
+ if (ContextFlags & CONTEXT_FLOATING_POINT)
{
+ Context->MxCsr = TrapFrame->MxCsr;
Context->Xmm0 = TrapFrame->Xmm0;
Context->Xmm1 = TrapFrame->Xmm1;
Context->Xmm2 = TrapFrame->Xmm2;
// __ltr(&ProcessorState->SpecialRegisters.Tr);
__lidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
-// __ldmxcsr(&ProcessorState->SpecialRegisters.MxCsr); // FIXME
+ _mm_setcsr(ProcessorState->SpecialRegisters.MxCsr);
// ProcessorState->SpecialRegisters.DebugControl
// ProcessorState->SpecialRegisters.LastBranchToRip
// ProcessorState->SpecialRegisters.LastBranchFromRip
__str(&ProcessorState->SpecialRegisters.Tr);
__sidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
-// __stmxcsr(&ProcessorState->SpecialRegisters.MxCsr);
+ ProcessorState->SpecialRegisters.MxCsr = _mm_getcsr();
// ProcessorState->SpecialRegisters.DebugControl =
// ProcessorState->SpecialRegisters.LastBranchToRip =
// ProcessorState->SpecialRegisters.LastBranchFromRip =
Pcr->Prcb.ProcessorState.SpecialRegisters.KernelDr6 = 0;
Pcr->Prcb.ProcessorState.SpecialRegisters.KernelDr7 = 0;
+ /* Initialize MXCSR (all exceptions masked) */
+ Pcr->Prcb.MxCsr = INITIAL_MXCSR;
+
/* Set the Current Thread */
Pcr->Prcb.CurrentThread = IdleThread;
Pat = (PAT_WB << 0) | (PAT_WC << 8) | (PAT_UCM << 16) | (PAT_UC << 24) |
(PAT_WB << 32) | (PAT_WC << 40) | (PAT_UCM << 48) | (PAT_UC << 56);
__writemsr(MSR_PAT, Pat);
+
+ /* Initialize MXCSR */
+ _mm_setcsr(INITIAL_MXCSR);
}
VOID
RtlInitializeContext(
_Reserved_ HANDLE ProcessHandle,
_Out_ PCONTEXT ThreadContext,
- _In_ PVOID ThreadStartParam OPTIONAL,
+ _In_opt_ PVOID ThreadStartParam,
_In_ PTHREAD_START_ROUTINE ThreadStartAddress,
_In_ PINITIAL_TEB StackBase)
{
ThreadContext->SegSs = KGDT64_R3_DATA | RPL_MASK;
}
+ ThreadContext->MxCsr = INITIAL_MXCSR;
+
/* Only the basic Context is initialized */
ThreadContext->ContextFlags = CONTEXT_CONTROL |
CONTEXT_INTEGER |
- CONTEXT_SEGMENTS;
+ CONTEXT_SEGMENTS |
+ CONTEXT_FLOATING_POINT;
return;
}