BOOLEAN KiSwapContextResume	(	IN PKTHREAD	NewThread,
		IN PKTHREAD	OldThread,
		IN BOOLEAN	ApcBypass
	)
Definition at line 140 of file thrdini.c.
{
    PKIPCR Pcr = (PKIPCR)KeGetPcr();
    PKPROCESS OldProcess, NewProcess;

    /* Setup ring 0 stack pointer */
    Pcr->TssBase->Rsp0 = (ULONG64)NewThread->InitialStack; // FIXME: NPX save area?
    Pcr->Prcb.RspBase = Pcr->TssBase->Rsp0;

    /* Now we are the new thread. Check if it's in a new process */
    OldProcess = OldThread->ApcState.Process;
    NewProcess = NewThread->ApcState.Process;
    if (OldProcess != NewProcess)
    {
        /* Switch address space and flush TLB */
        __writecr3(NewProcess->DirectoryTableBase[0]);

        /* Set new TSS fields */
        //Pcr->TssBase->IoMapBase = NewProcess->IopmOffset;
    }

    /* Set TEB pointer and GS base */
    Pcr->NtTib.Self = (PVOID)NewThread->Teb;
    if (NewThread->Teb)
    {
       /* This will switch the usermode gs */
       __writemsr(MSR_GS_SWAP, (ULONG64)NewThread->Teb);
    }

    /* Increase context switch count */
    Pcr->ContextSwitches++;
    NewThread->ContextSwitches++;

    /* DPCs shouldn't be active */
    if (Pcr->Prcb.DpcRoutineActive)
    {
        /* Crash the machine */
        KeBugCheckEx(ATTEMPTED_SWITCH_FROM_DPC,
                     (ULONG_PTR)OldThread,
                     (ULONG_PTR)NewThread,
                     (ULONG_PTR)OldThread->InitialStack,
                     0);
    }

    /* Kernel APCs may be pending */
    if (NewThread->ApcState.KernelApcPending)
    {
        /* Are APCs enabled? */
        if (!NewThread->SpecialApcDisable)
        {
            /* Request APC delivery */
            if (!ApcBypass)
                HalRequestSoftwareInterrupt(APC_LEVEL);
            else
                return TRUE;
        }
    }

    /* Return stating that no kernel APCs are pending*/
    return FALSE;
}
ReactOS Development > Doxygen
