ntoskrnl/ps/i386/psctx.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/ps/i386/psctx.c
   5  * PURPOSE:         Process Manager: Set/Get Context for i386
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* FUNCTIONS ******************************************************************/
  16
  17 VOID
  18 NTAPI
  19 PspGetContext(IN PKTRAP_FRAME TrapFrame,
  20               IN PVOID NonVolatileContext,
  21               IN OUT PCONTEXT Context)
  22 {
  23     PAGED_CODE();
  24
  25     /* Convert the trap frame to a context */
  26     KeTrapFrameToContext(TrapFrame, NULL, Context);
  27 }
  28
  29 VOID
  30 NTAPI
  31 PspSetContext(OUT PKTRAP_FRAME TrapFrame,
  32               OUT PVOID NonVolatileContext,
  33               IN PCONTEXT Context,
  34               IN KPROCESSOR_MODE Mode)
  35 {
  36     PAGED_CODE();
  37
  38     /* Convert the context to a trap frame structure */
  39     KeContextToTrapFrame(Context, NULL, TrapFrame, Context->ContextFlags, Mode);
  40 }
  41
  42 VOID
  43 NTAPI
  44 PspGetOrSetContextKernelRoutine(IN PKAPC Apc,
  45                                 IN OUT PKNORMAL_ROUTINE* NormalRoutine,
  46                                 IN OUT PVOID* NormalContext,
  47                                 IN OUT PVOID* SystemArgument1,
  48                                 IN OUT PVOID* SystemArgument2)
  49 {
  50     PGET_SET_CTX_CONTEXT GetSetContext;
  51     PKEVENT Event;
  52     PCONTEXT Context;
  53     PETHREAD Thread;
  54     KPROCESSOR_MODE Mode;
  55     PKTRAP_FRAME TrapFrame = NULL;
  56     PAGED_CODE();
  57
  58     /* Get the Context Structure */
  59     GetSetContext = CONTAINING_RECORD(Apc, GET_SET_CTX_CONTEXT, Apc);
  60     Context = &GetSetContext->Context;
  61     Event = &GetSetContext->Event;
  62     Mode = GetSetContext->Mode;
  63     Thread = Apc->SystemArgument2;
  64
  65     /* If this is a kernel-mode request, grab the saved trap frame */
  66     if (Mode == KernelMode) TrapFrame = Thread->Tcb.TrapFrame;
  67
  68     /* If we don't have one, grab it from the stack */
  69     if (!TrapFrame)
  70     {
  71         /* Trap frame is right under our initial stack */
  72         TrapFrame = KeGetTrapFrame(&Thread->Tcb);
  73     }
  74
  75     /* Check if it's a set or get */
  76     if (Apc->SystemArgument1)
  77     {
  78         /* Set the Context */
  79         PspSetContext(TrapFrame, NULL, Context, Mode);
  80     }
  81     else
  82     {
  83         /* Get the Context */
  84         PspGetContext(TrapFrame, NULL, Context);
  85     }
  86
  87     /* Notify the Native API that we are done */
  88     KeSetEvent(Event, IO_NO_INCREMENT, FALSE);
  89 }
  90
  91 /* EOF */