mirror of
https://github.com/reactos/reactos.git
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207 lines
5.9 KiB
C
207 lines
5.9 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/ke/amd64/thrdini.c
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* PURPOSE: amd64 Thread Context Creation
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* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
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* Alex Ionescu (alex@relsoft.net)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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typedef struct _KUINIT_FRAME
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{
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KSWITCH_FRAME CtxSwitchFrame;
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KSTART_FRAME StartFrame;
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KEXCEPTION_FRAME ExceptionFrame;
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KTRAP_FRAME TrapFrame;
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//FX_SAVE_AREA FxSaveArea;
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} KUINIT_FRAME, *PKUINIT_FRAME;
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typedef struct _KKINIT_FRAME
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{
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KSWITCH_FRAME CtxSwitchFrame;
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KSTART_FRAME StartFrame;
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//FX_SAVE_AREA FxSaveArea;
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} KKINIT_FRAME, *PKKINIT_FRAME;
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/* FUNCTIONS *****************************************************************/
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VOID
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NTAPI
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KiInitializeContextThread(IN PKTHREAD Thread,
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IN PKSYSTEM_ROUTINE SystemRoutine,
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IN PKSTART_ROUTINE StartRoutine,
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IN PVOID StartContext,
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IN PCONTEXT Context)
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{
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//PFX_SAVE_AREA FxSaveArea;
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//PFXSAVE_FORMAT FxSaveFormat;
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PKSTART_FRAME StartFrame;
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PKSWITCH_FRAME CtxSwitchFrame;
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PKTRAP_FRAME TrapFrame;
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ULONG ContextFlags;
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/* Check if this is a With-Context Thread */
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if (Context)
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{
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PKUINIT_FRAME InitFrame;
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/* Set up the Initial Frame */
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InitFrame = ((PKUINIT_FRAME)Thread->InitialStack) - 1;
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StartFrame = &InitFrame->StartFrame;
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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/* Save back the new value of the kernel stack. */
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Thread->KernelStack = (PVOID)InitFrame;
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/* Tell the thread it will run in User Mode */
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Thread->PreviousMode = UserMode;
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// FIXME Setup the Fx Area
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/* Set the Thread's NPX State */
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Thread->NpxState = 0xA;
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Thread->Header.NpxIrql = PASSIVE_LEVEL;
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/* Make sure, we have control registers, disable debug registers */
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ASSERT((Context->ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL);
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ContextFlags = Context->ContextFlags & ~CONTEXT_DEBUG_REGISTERS;
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/* Setup the Trap Frame */
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TrapFrame = &InitFrame->TrapFrame;
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/* Zero out the trap frame */
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RtlZeroMemory(TrapFrame, sizeof(KTRAP_FRAME));
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/* Set up a trap frame from the context. */
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KeContextToTrapFrame(Context,
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NULL,
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TrapFrame,
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CONTEXT_AMD64 | ContextFlags,
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UserMode);
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/* Set SS, DS, ES's RPL Mask properly */
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TrapFrame->SegSs |= RPL_MASK;
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TrapFrame->SegDs |= RPL_MASK;
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TrapFrame->SegEs |= RPL_MASK;
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TrapFrame->Dr7 = 0;
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/* Set the previous mode as user */
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TrapFrame->PreviousMode = UserMode;
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/* Terminate the Exception Handler List */
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TrapFrame->ExceptionFrame = 0;
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/* We return to ... */
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StartFrame->Return = (ULONG64)KiServiceExit2;
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}
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else
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{
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PKKINIT_FRAME InitFrame;
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/* Set up the Initial Frame for the system thread */
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InitFrame = ((PKKINIT_FRAME)Thread->InitialStack) - 1;
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StartFrame = &InitFrame->StartFrame;
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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/* Save back the new value of the kernel stack. */
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Thread->KernelStack = (PVOID)InitFrame;
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/* Tell the thread it will run in Kernel Mode */
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Thread->PreviousMode = KernelMode;
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// FIXME Setup the Fx Area
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/* No NPX State */
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Thread->NpxState = 0xA;
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/* We have no return address! */
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StartFrame->Return = 0;
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}
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/* Set up the Context Switch Frame */
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CtxSwitchFrame->Return = (ULONG64)KiThreadStartup;
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CtxSwitchFrame->ApcBypass = FALSE;
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StartFrame->P1Home = (ULONG64)StartRoutine;
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StartFrame->P2Home = (ULONG64)StartContext;
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StartFrame->P3Home = 0;
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StartFrame->P4Home = (ULONG64)SystemRoutine;
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StartFrame->Reserved = 0;
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}
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BOOLEAN
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KiSwapContextResume(
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IN PKTHREAD NewThread,
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IN PKTHREAD OldThread,
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IN BOOLEAN ApcBypass)
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{
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PKIPCR Pcr = (PKIPCR)KeGetPcr();
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PKPROCESS OldProcess, NewProcess;
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/* Setup ring 0 stack pointer */
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Pcr->TssBase->Rsp0 = (ULONG64)NewThread->InitialStack; // FIXME: NPX save area?
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Pcr->Prcb.RspBase = Pcr->TssBase->Rsp0;
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/* Now we are the new thread. Check if it's in a new process */
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OldProcess = OldThread->ApcState.Process;
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NewProcess = NewThread->ApcState.Process;
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if (OldProcess != NewProcess)
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{
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/* Switch address space and flush TLB */
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__writecr3(NewProcess->DirectoryTableBase[0]);
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/* Set new TSS fields */
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//Pcr->TssBase->IoMapBase = NewProcess->IopmOffset;
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}
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/* Set TEB pointer and GS base */
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Pcr->NtTib.Self = (PVOID)NewThread->Teb;
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if (NewThread->Teb)
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{
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/* This will switch the usermode gs */
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__writemsr(MSR_GS_SWAP, (ULONG64)NewThread->Teb);
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}
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/* Increase context switch count */
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Pcr->ContextSwitches++;
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NewThread->ContextSwitches++;
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/* DPCs shouldn't be active */
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if (Pcr->Prcb.DpcRoutineActive)
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{
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/* Crash the machine */
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KeBugCheckEx(ATTEMPTED_SWITCH_FROM_DPC,
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(ULONG_PTR)OldThread,
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(ULONG_PTR)NewThread,
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(ULONG_PTR)OldThread->InitialStack,
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0);
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}
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/* Kernel APCs may be pending */
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if (NewThread->ApcState.KernelApcPending)
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{
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/* Are APCs enabled? */
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if (!NewThread->SpecialApcDisable)
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{
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/* Request APC delivery */
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if (!ApcBypass)
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HalRequestSoftwareInterrupt(APC_LEVEL);
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else
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return TRUE;
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}
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}
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/* Return stating that no kernel APCs are pending*/
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return FALSE;
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}
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/* EOF */
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