ntoskrnl/ke/amd64/thrdini.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/ke/i386/thread.c
   5  * PURPOSE:         i386 Thread Context Creation
   6  * PROGRAMMER:      Alex Ionescu (alex@relsoft.net)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 typedef struct _KSWITCHFRAME
  16 {
  17     PVOID ExceptionList;
  18     BOOLEAN ApcBypassDisable;
  19     PVOID RetAddr;
  20 } KSWITCHFRAME, *PKSWITCHFRAME;
  21
  22 typedef struct _KSTART_FRAME
  23 {
  24     PKSYSTEM_ROUTINE SystemRoutine;
  25     PKSTART_ROUTINE StartRoutine;
  26     PVOID StartContext;
  27     BOOLEAN UserThread;
  28 } KSTART_FRAME, *PKSTART_FRAME;
  29
  30 typedef struct _KUINIT_FRAME
  31 {
  32     KSWITCHFRAME CtxSwitchFrame;
  33     KSTART_FRAME StartFrame;
  34     KTRAP_FRAME TrapFrame;
  35     //FX_SAVE_AREA FxSaveArea;
  36 } KUINIT_FRAME, *PKUINIT_FRAME;
  37
  38 typedef struct _KKINIT_FRAME
  39 {
  40     KSWITCHFRAME CtxSwitchFrame;
  41     KSTART_FRAME StartFrame;
  42     //FX_SAVE_AREA FxSaveArea;
  43 } KKINIT_FRAME, *PKKINIT_FRAME;
  44
  45 /* FUNCTIONS *****************************************************************/
  46
  47 VOID
  48 NTAPI
  49 KiInitializeContextThread(IN PKTHREAD Thread,
  50                            IN PKSYSTEM_ROUTINE SystemRoutine,
  51                            IN PKSTART_ROUTINE StartRoutine,
  52                            IN PVOID StartContext,
  53                            IN PCONTEXT ContextPointer)
  54 {
  55     //PFX_SAVE_AREA FxSaveArea;
  56     //PFXSAVE_FORMAT FxSaveFormat;
  57     PKSTART_FRAME StartFrame;
  58     PKSWITCHFRAME CtxSwitchFrame;
  59     PKTRAP_FRAME TrapFrame;
  60     CONTEXT LocalContext;
  61     PCONTEXT Context = NULL;
  62     ULONG ContextFlags;
  63
  64     /* Check if this is a With-Context Thread */
  65     if (ContextPointer)
  66     {
  67         /* Set up the Initial Frame */
  68         PKUINIT_FRAME InitFrame;
  69         InitFrame = (PKUINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
  70                                     sizeof(KUINIT_FRAME));
  71
  72         /* Copy over the context we got */
  73         RtlCopyMemory(&LocalContext, ContextPointer, sizeof(CONTEXT));
  74         Context = &LocalContext;
  75         ContextFlags = CONTEXT_CONTROL;
  76
  77         /* Zero out the trap frame and save area */
  78         RtlZeroMemory(&InitFrame->TrapFrame,
  79                       KTRAP_FRAME_LENGTH);
  80
  81         /* Setup the Fx Area */
  82         //FxSaveArea = &InitFrame->FxSaveArea;
  83
  84 //            /* Get the FX Save Format Area */
  85 //            FxSaveFormat = (PFXSAVE_FORMAT)Context->ExtendedRegisters;
  86 //
  87 //            /* Set an initial state */
  88 //            FxSaveFormat->ControlWord = 0x27F;
  89 //            FxSaveFormat->StatusWord = 0;
  90 //            FxSaveFormat->TagWord = 0;
  91 //            FxSaveFormat->ErrorOffset = 0;
  92 //            FxSaveFormat->ErrorSelector = 0;
  93 //            FxSaveFormat->DataOffset = 0;
  94 //            FxSaveFormat->DataSelector = 0;
  95 //            FxSaveFormat->MXCsr = 0x1F80;
  96
  97         /* Set an intial NPX State */
  98         //Context->FloatSave.Cr0NpxState = 0;
  99         //FxSaveArea->Cr0NpxState = 0;
 100         //FxSaveArea->NpxSavedCpu = 0;
 101
 102         /* Now set the context flags depending on XMM support */
 103         //ContextFlags |= (KeI386FxsrPresent) ? CONTEXT_EXTENDED_REGISTERS :
 104         //                                      CONTEXT_FLOATING_POINT;
 105
 106         /* Set the Thread's NPX State */
 107         Thread->NpxState = 0xA;
 108         Thread->DispatcherHeader.NpxIrql = PASSIVE_LEVEL;
 109
 110         /* Disable any debug regiseters */
 111         Context->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS;
 112
 113         /* Setup the Trap Frame */
 114         TrapFrame = &InitFrame->TrapFrame;
 115
 116         /* Set up a trap frame from the context. */
 117         KeContextToTrapFrame(Context,
 118                              NULL,
 119                              TrapFrame,
 120                              Context->ContextFlags | ContextFlags,
 121                              UserMode);
 122
 123         /* Set SS, DS, ES's RPL Mask properly */
 124         TrapFrame->SegSs |= RPL_MASK;
 125         TrapFrame->SegDs |= RPL_MASK;
 126         TrapFrame->SegEs |= RPL_MASK;
 127         TrapFrame->Dr7 = 0;
 128
 129         /* Set the previous mode as user */
 130         TrapFrame->PreviousMode = UserMode;
 131
 132         /* Terminate the Exception Handler List */
 133         TrapFrame->ExceptionFrame = 0;
 134
 135         /* Setup the Stack for KiThreadStartup and Context Switching */
 136         StartFrame = &InitFrame->StartFrame;
 137         CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
 138
 139         /* Tell the thread it will run in User Mode */
 140         Thread->PreviousMode = UserMode;
 141
 142         /* Tell KiThreadStartup of that too */
 143         StartFrame->UserThread = TRUE;
 144     }
 145     else
 146     {
 147         /* Set up the Initial Frame for the system thread */
 148         PKKINIT_FRAME InitFrame;
 149         InitFrame = (PKKINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
 150                                     sizeof(KKINIT_FRAME));
 151
 152         /* Setup the Fx Area */
 153         //FxSaveArea = &InitFrame->FxSaveArea;
 154         //RtlZeroMemory(FxSaveArea, sizeof(FX_SAVE_AREA));
 155
 156         /* Check if we have Fxsr support */
 157         DPRINT1("FxsrPresent but did nothing\n");
 158 //        /* Set the stub FX area */
 159 //        FxSaveArea->U.FxArea.ControlWord = 0x27F;
 160 //        FxSaveArea->U.FxArea.MXCsr = 0x1F80;
 161
 162         /* No NPX State */
 163         Thread->NpxState = 0xA;
 164
 165         /* Setup the Stack for KiThreadStartup and Context Switching */
 166         StartFrame = &InitFrame->StartFrame;
 167         CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
 168
 169         /* Tell the thread it will run in Kernel Mode */
 170         Thread->PreviousMode = KernelMode;
 171
 172         /* Tell KiThreadStartup of that too */
 173         StartFrame->UserThread = FALSE;
 174     }
 175
 176     /* Now setup the remaining data for KiThreadStartup */
 177     StartFrame->StartContext = StartContext;
 178     StartFrame->StartRoutine = StartRoutine;
 179     StartFrame->SystemRoutine = SystemRoutine;
 180
 181     /* And set up the Context Switch Frame */
 182     CtxSwitchFrame->RetAddr = KiThreadStartup;
 183     CtxSwitchFrame->ApcBypassDisable = TRUE;
 184     CtxSwitchFrame->ExceptionList = EXCEPTION_CHAIN_END;;
 185
 186     /* Save back the new value of the kernel stack. */
 187     Thread->KernelStack = (PVOID)CtxSwitchFrame;
 188
 189 }
 190
 191 /* EOF */
 192
 193