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vdmentry.c
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Upload Date: 2013-09-21
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Windows Develop

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Visual C++

vdmentry.c：Code Content
  1. /*++
  3. Copyright (c) 1991  Microsoft Corporation
  5. Module Name:
  7.     vdmentry.c
  9. Abstract:
  11.     This function dispatches to the vdm services
  13. Author:
  15.     Dave Hastings (daveh) 6-Apr-1992
  17. Notes:
  19.     This module will be fleshed out when the great vdm code consolidation
  20.     occurs, sometime soon after the functionality is done.
  22. Revision History:
  24.      24-Sep-1993 Jonle: reoptimize dispatcher to suit the number of services
  25.                         add QueueInterrupt service
  27. --*/
  29. #include "vdmp.h"
  30. #include <ntvdmp.h>
  32. #ifdef ALLOC_PRAGMA
  33. #pragma alloc_text(PAGE, NtVdmControl)
  34. #endif
  36. #if DBG
  37. void AssertIrqlPassive(void)
  38. {
  39. if (KeGetCurrentIrql() > PASSIVE_LEVEL) {
  40.     DbgPrint("NtVdmControl:returning at raised irql!n");
  41.     DbgBreakPoint();
  42.     }
  43. }
  44. #else
  45. #define AssertIrqlPassive()
  46. #endif
  50. NTSTATUS
  51. NtVdmControl(
  52.     IN VDMSERVICECLASS Service,
  53.     IN OUT PVOID ServiceData
  54.     )
  55. /*++
  57. Routine Description:
  59.     386 specific routine which dispatches to the appropriate function
  60.     based on service number.
  62. Arguments:
  64.     Service -- Specifies what service is to be performed
  65.     ServiceData -- Supplies a pointer to service specific data
  67. Return Value:
  69.     if invalid service number: STATUS_INVALID_PARAMETER_1
  70.     else see individual services.
  73. --*/
  74. {
  75.     NTSTATUS Status;
  77.     PAGED_CODE();
  79.     //
  80.     //  Dispatch in descending order of frequency
  81.     //
  82.     if (Service == VdmStartExecution) {
  83.         Status = VdmpStartExecution();
  84.     } else if (Service == VdmQueueInterrupt) {
  85.         Status = VdmpQueueInterrupt(ServiceData);
  86.     } else if (Service == VdmDelayInterrupt) {
  87.         Status = VdmpDelayInterrupt(ServiceData);
  88.     } else if (Service == VdmQueryDir) {
  89.         Status = VdmQueryDirectoryFile(ServiceData);
  90.     } else if (Service == VdmInitialize) {
  91.         Status = VdmpInitialize(ServiceData);
  92.     } else if (Service == VdmFeatures) {
  93.         try {
  94.             //
  95.             // Verify that we were passed a valid user address
  96.             //
  97.             ProbeForWriteBoolean((PBOOLEAN)ServiceData);
  99.             //
  100.             // Return the appropriate feature bits to notify
  101.             // ntvdm which modes (if any) fast IF emulation is
  102.             // available for
  103.             //
  104.             if (KeI386VdmIoplAllowed) {
  105.                 *((PULONG)ServiceData) = V86_VIRTUAL_INT_EXTENSIONS;
  106.             } else {
  107.                 // remove this if pm extensions to be used
  108.                 *((PULONG)ServiceData) = KeI386VirtualIntExtensions &
  109.                     ~PM_VIRTUAL_INT_EXTENSIONS;
  110.             }
  112.         } except(EXCEPTION_EXECUTE_HANDLER) {
  113.                 Status = GetExceptionCode();
  114.         }
  115.         Status = STATUS_SUCCESS;
  117.     } else if (Service == VdmSetInt21Handler) {
  118.         try {
  119.             ProbeForRead(ServiceData, sizeof(VDMSET_INT21_HANDLER_DATA), 1);
  121.             Status = Ke386SetVdmInterruptHandler(
  122.                 KeGetCurrentThread()->ApcState.Process,
  123.                 0x21L,
  124.                 (USHORT)(((PVDMSET_INT21_HANDLER_DATA)ServiceData)->Selector),
  125.                 ((PVDMSET_INT21_HANDLER_DATA)ServiceData)->Offset,
  126.                 ((PVDMSET_INT21_HANDLER_DATA)ServiceData)->Gate32
  127.                 );
  128.         } except(EXCEPTION_EXECUTE_HANDLER) {
  129.             Status = GetExceptionCode();
  130.         }
  132.     } else if (Service == VdmPrinterDirectIoOpen) {
  133.         Status = VdmpPrinterDirectIoOpen(ServiceData);
  134.     } else if (Service == VdmPrinterDirectIoClose) {
  135.         Status = VdmpPrinterDirectIoClose(ServiceData);
  136.     } else if (Service == VdmPrinterInitialize) {
  137.         Status = VdmpPrinterInitialize(ServiceData);
  138.     } else {
  139.         Status = STATUS_INVALID_PARAMETER_1;
  140.     }
  143.     AssertIrqlPassive();
  144.     return Status;
  146. }