2005-04-22 12:52:25 +00:00
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/*
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2005-01-26 13:58:37 +00:00
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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/i386/thread.c
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2005-04-22 12:52:25 +00:00
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* PURPOSE: i386 Thread Context Creation
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2006-01-15 09:23:55 +00:00
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* PROGRAMMER: Alex Ionescu (alex@relsoft.net)
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1999-11-12 12:01:17 +00:00
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*/
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2007-01-17 20:44:37 +00:00
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/* INCLUDES ******************************************************************/
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1999-11-12 12:01:17 +00:00
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2004-08-15 16:39:12 +00:00
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#include <ntoskrnl.h>
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1999-11-12 12:01:17 +00:00
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#define NDEBUG
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2007-01-17 20:44:37 +00:00
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#include <debug.h>
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2005-05-09 01:38:29 +00:00
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2007-01-17 20:44:37 +00:00
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typedef struct _KSWITCHFRAME
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2006-01-15 09:23:55 +00:00
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{
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2005-04-22 12:52:25 +00:00
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PVOID ExceptionList;
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2007-01-17 20:44:37 +00:00
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BOOLEAN ApcBypassDisable;
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PVOID RetAddr;
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} KSWITCHFRAME, *PKSWITCHFRAME;
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2005-04-22 12:52:25 +00:00
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2006-01-15 09:23:55 +00:00
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typedef struct _KSTART_FRAME
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{
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2005-04-22 12:52:25 +00:00
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PKSYSTEM_ROUTINE SystemRoutine;
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PKSTART_ROUTINE StartRoutine;
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PVOID StartContext;
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2005-05-09 01:38:29 +00:00
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BOOLEAN UserThread;
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2005-04-22 12:52:25 +00:00
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} KSTART_FRAME, *PKSTART_FRAME;
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1999-11-12 12:01:17 +00:00
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2007-01-17 20:44:37 +00:00
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typedef struct _KUINIT_FRAME
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{
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KSWITCHFRAME CtxSwitchFrame;
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KSTART_FRAME StartFrame;
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KTRAP_FRAME TrapFrame;
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FX_SAVE_AREA FxSaveArea;
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2005-04-22 12:52:25 +00:00
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} KUINIT_FRAME, *PKUINIT_FRAME;
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2007-01-17 20:44:37 +00:00
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typedef struct _KKINIT_FRAME
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{
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KSWITCHFRAME CtxSwitchFrame;
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KSTART_FRAME StartFrame;
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FX_SAVE_AREA FxSaveArea;
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2005-04-22 12:52:25 +00:00
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} KKINIT_FRAME, *PKKINIT_FRAME;
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2002-08-08 17:54:16 +00:00
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2005-04-22 12:52:25 +00:00
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/* FUNCTIONS *****************************************************************/
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2000-05-13 13:51:08 +00:00
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2010-01-19 06:34:15 +00:00
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VOID
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NTAPI
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KiThreadStartup(VOID)
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{
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PKTRAP_FRAME TrapFrame;
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PKSTART_FRAME StartFrame;
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PKUINIT_FRAME InitFrame;
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/* Get the start and trap frames */
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InitFrame = KeGetCurrentThread()->KernelStack;
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StartFrame = &InitFrame->StartFrame;
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TrapFrame = &InitFrame->TrapFrame;
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/* Lower to APC level */
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KfLowerIrql(APC_LEVEL);
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/* Call the system routine */
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StartFrame->SystemRoutine(StartFrame->StartRoutine, StartFrame->StartContext);
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/* If we returned, we better be a user thread */
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if (!StartFrame->UserThread) DbgBreakPoint();
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/* Exit to user-mode */
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KiServiceExit2(TrapFrame);
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}
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2005-04-22 12:52:25 +00:00
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VOID
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2007-01-17 20:44:37 +00:00
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NTAPI
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2009-09-27 10:09:38 +00:00
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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 ContextPointer)
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1999-11-12 12:01:17 +00:00
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{
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2005-04-22 12:52:25 +00:00
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PFX_SAVE_AREA FxSaveArea;
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2006-01-15 09:23:55 +00:00
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PFXSAVE_FORMAT FxSaveFormat;
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2005-04-22 12:52:25 +00:00
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PKSTART_FRAME StartFrame;
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2007-01-17 20:44:37 +00:00
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PKSWITCHFRAME CtxSwitchFrame;
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2006-01-15 09:23:55 +00:00
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PKTRAP_FRAME TrapFrame;
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CONTEXT LocalContext;
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PCONTEXT Context = NULL;
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ULONG ContextFlags;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Check if this is a With-Context Thread */
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2006-01-15 09:23:55 +00:00
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if (ContextPointer)
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2005-04-23 04:12:26 +00:00
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{
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2005-04-22 12:52:25 +00:00
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/* Set up the Initial Frame */
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PKUINIT_FRAME InitFrame;
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2006-01-15 09:23:55 +00:00
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InitFrame = (PKUINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
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sizeof(KUINIT_FRAME));
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2005-05-09 01:38:29 +00:00
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2006-01-15 09:23:55 +00:00
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/* Copy over the context we got */
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2006-10-22 09:06:58 +00:00
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RtlCopyMemory(&LocalContext, ContextPointer, sizeof(CONTEXT));
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2006-01-15 09:23:55 +00:00
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Context = &LocalContext;
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ContextFlags = CONTEXT_CONTROL;
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2005-05-09 01:38:29 +00:00
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2007-03-19 19:43:50 +00:00
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/* Zero out the trap frame and save area */
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RtlZeroMemory(&InitFrame->TrapFrame,
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KTRAP_FRAME_LENGTH + sizeof(FX_SAVE_AREA));
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2006-01-15 09:23:55 +00:00
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/* Setup the Fx Area */
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FxSaveArea = &InitFrame->FxSaveArea;
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/* Check if we support FXsr */
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if (KeI386FxsrPresent)
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{
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/* Get the FX Save Format Area */
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FxSaveFormat = (PFXSAVE_FORMAT)Context->ExtendedRegisters;
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/* Set an initial state */
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FxSaveFormat->ControlWord = 0x27F;
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FxSaveFormat->StatusWord = 0;
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FxSaveFormat->TagWord = 0;
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FxSaveFormat->ErrorOffset = 0;
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FxSaveFormat->ErrorSelector = 0;
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2006-08-20 19:08:57 +00:00
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FxSaveFormat->DataOffset = 0;
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2006-01-15 09:23:55 +00:00
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FxSaveFormat->DataSelector = 0;
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FxSaveFormat->MXCsr = 0x1F80;
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}
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else
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2005-04-23 04:12:26 +00:00
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{
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2006-01-15 09:23:55 +00:00
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/* Setup the regular save area */
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Context->FloatSave.ControlWord = 0x27F;
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Context->FloatSave.StatusWord = 0;
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Context->FloatSave.TagWord = -1;
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Context->FloatSave.ErrorOffset = 0;
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Context->FloatSave.ErrorSelector = 0;
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Context->FloatSave.DataOffset =0;
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Context->FloatSave.DataSelector = 0;
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}
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/* Check if the CPU has NPX */
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if (KeI386NpxPresent)
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{
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/* Set an intial NPX State */
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Context->FloatSave.Cr0NpxState = 0;
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FxSaveArea->Cr0NpxState = 0;
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FxSaveArea->NpxSavedCpu = 0;
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/* Now set the context flags depending on XMM support */
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2007-03-19 19:43:50 +00:00
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ContextFlags |= (KeI386FxsrPresent) ? CONTEXT_EXTENDED_REGISTERS :
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2006-01-15 09:23:55 +00:00
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CONTEXT_FLOATING_POINT;
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/* Set the Thread's NPX State */
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2006-08-20 19:08:57 +00:00
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Thread->NpxState = NPX_STATE_NOT_LOADED;
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2006-01-15 09:23:55 +00:00
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Thread->DispatcherHeader.NpxIrql = PASSIVE_LEVEL;
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2005-05-09 01:38:29 +00:00
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}
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else
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{
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2006-01-15 09:23:55 +00:00
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/* We'll use emulation */
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FxSaveArea->Cr0NpxState = CR0_EM;
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Thread->NpxState = NPX_STATE_NOT_LOADED &~ CR0_MP;
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2005-04-23 04:12:26 +00:00
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}
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2005-05-09 01:38:29 +00:00
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2008-08-22 14:29:01 +00:00
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/* Disable any debug registers */
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2006-01-15 20:13:08 +00:00
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Context->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS;
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2006-01-15 09:23:55 +00:00
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/* Setup the Trap Frame */
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TrapFrame = &InitFrame->TrapFrame;
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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->ContextFlags | ContextFlags,
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UserMode);
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/* Set SS, DS, ES's RPL Mask properly */
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TrapFrame->HardwareSegSs |= RPL_MASK;
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TrapFrame->SegDs |= RPL_MASK;
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TrapFrame->SegEs |= RPL_MASK;
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2006-01-15 20:26:53 +00:00
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TrapFrame->Dr7 = 0;
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2006-01-15 09:23:55 +00:00
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/* Set the debug mark */
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TrapFrame->DbgArgMark = 0xBADB0D00;
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2005-05-09 01:38:29 +00:00
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2005-04-23 04:12:26 +00:00
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/* Set the previous mode as user */
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2005-11-27 19:21:19 +00:00
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TrapFrame->PreviousPreviousMode = UserMode;
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2005-05-09 01:38:29 +00:00
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2005-04-23 04:12:26 +00:00
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/* Terminate the Exception Handler List */
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2007-03-19 19:43:50 +00:00
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TrapFrame->ExceptionList = EXCEPTION_CHAIN_END;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Setup the Stack for KiThreadStartup and Context Switching */
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StartFrame = &InitFrame->StartFrame;
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Tell the thread it will run in User Mode */
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Thread->PreviousMode = UserMode;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Tell KiThreadStartup of that too */
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StartFrame->UserThread = TRUE;
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2005-05-09 01:38:29 +00:00
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}
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else
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2005-04-23 04:12:26 +00:00
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{
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2006-01-15 09:23:55 +00:00
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/* Set up the Initial Frame for the system thread */
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2005-04-22 12:52:25 +00:00
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PKKINIT_FRAME InitFrame;
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2006-01-15 09:23:55 +00:00
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InitFrame = (PKKINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
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sizeof(KKINIT_FRAME));
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2006-01-14 20:36:49 +00:00
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2005-04-22 12:52:25 +00:00
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/* Setup the Fx Area */
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FxSaveArea = &InitFrame->FxSaveArea;
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RtlZeroMemory(FxSaveArea, sizeof(FX_SAVE_AREA));
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2006-01-14 20:36:49 +00:00
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2006-01-15 09:23:55 +00:00
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/* Check if we have Fxsr support */
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if (KeI386FxsrPresent)
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{
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/* Set the stub FX area */
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FxSaveArea->U.FxArea.ControlWord = 0x27F;
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FxSaveArea->U.FxArea.MXCsr = 0x1F80;
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}
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else
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{
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/* Set the stub FN area */
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FxSaveArea->U.FnArea.ControlWord = 0x27F;
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FxSaveArea->U.FnArea.TagWord = -1;
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}
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/* No NPX State */
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Thread->NpxState = NPX_STATE_NOT_LOADED;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Setup the Stack for KiThreadStartup and Context Switching */
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StartFrame = &InitFrame->StartFrame;
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Tell the thread it will run in Kernel Mode */
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Thread->PreviousMode = KernelMode;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Tell KiThreadStartup of that too */
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StartFrame->UserThread = FALSE;
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}
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Now setup the remaining data for KiThreadStartup */
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StartFrame->StartContext = StartContext;
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StartFrame->StartRoutine = StartRoutine;
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StartFrame->SystemRoutine = SystemRoutine;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* And set up the Context Switch Frame */
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2007-01-17 20:44:37 +00:00
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CtxSwitchFrame->RetAddr = KiThreadStartup;
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CtxSwitchFrame->ApcBypassDisable = TRUE;
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2008-09-12 11:13:15 +00:00
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CtxSwitchFrame->ExceptionList = EXCEPTION_CHAIN_END;
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2005-05-09 01:38:29 +00:00
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2005-04-22 12:52:25 +00:00
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/* Save back the new value of the kernel stack. */
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2005-04-23 04:12:26 +00:00
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Thread->KernelStack = (PVOID)CtxSwitchFrame;
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1999-11-12 12:01:17 +00:00
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}
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2002-02-15 14:47:55 +00:00
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/* EOF */
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2004-11-20 23:46:37 +00:00
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2007-01-17 20:44:37 +00:00
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