Leaked source code of windows server 2003
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/*++ BUILD Version: 0001 // Increment this if a change has global effects
Copyright (c) 1990-1996 Microsoft Corporation
Module Name:
ntddvdm.h
Abstract:
This is the include file that defines all constants and types for accessing the NTVDM kernel mode virtual devices.
Author:
William Hsieh (williamh) 31-May-1996
Revision History:
--*/
//
// NtDeviceIoControlFile IoControlCode values for this device.
//
// Warning: Remember that the low two bits of the code specify how the
// buffers are passed to the driver!
//
//
#define IOCTL_VDM_BASE FILE_DEVICE_VDM
//
// 32 VDDs. Each VDD has possible 127 private ioctl code
// These values are based on the fact that there are 12 bits reserved
// for function id in each IOCTL code.
//
#define IOCTL_VDM_GROUP_MASK 0xF80
#define IOCTL_VDM_GROUP_SIZE 127
#define IOCTL_VDM_PARALLEL_GROUP 0
#define IOCTL_VDM_PARALLEL_BASE IOCTL_VDM_BASE + IOCTL_VDM_PARALLEL_GROUP * IOCTL_VDM_GROUP_SIZE
#define IOCTL_VDM_PAR_WRITE_DATA_PORT CTL_CODE(IOCTL_VDM_PARALLEL_BASE, 1, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VDM_PAR_WRITE_CONTROL_PORT CTL_CODE(IOCTL_VDM_PARALLEL_BASE, 2, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VDM_PAR_READ_STATUS_PORT CTL_CODE(IOCTL_VDM_PARALLEL_BASE, 3, METHOD_BUFFERED, FILE_ANY_ACCESS)
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