294 lines
8.5 KiB
C
294 lines
8.5 KiB
C
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/*++
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Copyright (c) 1993-2001 Microsoft Corporation
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Module Name:
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ntddramd.w
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Abstract:
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This header file defines constants and types for accessing the RAMDISK driver.
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Author:
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Chuck Lenzmeier (ChuckL) 14-Aug-2001
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--*/
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#ifndef _NTDDRAMD_
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#define _NTDDRAMD_
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//
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// Strings for device names, etc.
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//
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// RAMDISK_DEVICENAME is the name of the control device. It is also the prefix
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// for the name of disk devices, which are named \Device\Ramdisk{guid}.
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//
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// RAMDISK_DOSNAME is the prefix for the DosDevices name of disk devices, which
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// are named Ramdisk{guid}.
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//
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// The remaining strings are used in conjunction with PnP.
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//
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#define RAMDISK_DEVICENAME L"\\Device\\Ramdisk"
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#define RAMDISK_DEVICE_NAME L"\\Device\\Ramdisk"
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#define RAMDISK_DRIVER_NAME L"RAMDISK"
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#define RAMDISK_DOSNAME L"Ramdisk"
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#define RAMDISK_FULL_DOSNAME L"\\global??\\Ramdisk"
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#define RAMDISK_VOLUME_DEVICE_TEXT L"RamVolume"
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#define RAMDISK_VOLUME_DEVICE_TEXT_ANSI "RamVolume"
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#define RAMDISK_DISK_DEVICE_TEXT L"RamDisk"
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#define RAMDISK_DISK_DEVICE_TEXT_ANSI "RamDisk"
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#define RAMDISK_ENUMERATOR_TEXT L"Ramdisk\\"
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#define RAMDISK_ENUMERATOR_BUS_TEXT L"Ramdisk\\0"
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//
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// Ramdisk device name maximum size ( in characters )
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//
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#define RAMDISK_MAX_DEVICE_NAME ( sizeof( L"\\Device\\Ramdisk{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}" ) / sizeof( WCHAR ) )
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//
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// IOCTL codes.
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//
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#define FSCTL_CREATE_RAM_DISK \
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CTL_CODE( FILE_DEVICE_VIRTUAL_DISK, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)
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#define FSCTL_MARK_RAM_DISK_FOR_DELETION \
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CTL_CODE( FILE_DEVICE_VIRTUAL_DISK, 1, METHOD_BUFFERED, FILE_ANY_ACCESS)
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#define FSCTL_QUERY_RAM_DISK \
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CTL_CODE( FILE_DEVICE_VIRTUAL_DISK, 2, METHOD_BUFFERED, FILE_ANY_ACCESS)
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//
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// FSCTL_CREATE_RAM_DISK
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//
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// This IOCTL is used to create a new RAMDISK device.
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//
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//
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// These are disk types. FILE_BACKED_DISK is an emulated disk backed by a file.
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// FILE_BACKED_VOLUME is an emulated volume backed by a file. BOOT_DISK is an
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// in-memory emulated boot volume. This type can only be specified by the OS during
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// boot. VIRTUAL_FLOPPY is an in-memory emulated floppy disk. This type can only be
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// specified (via the registry) during textmode setup.
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//
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#define RAMDISK_TYPE_FILE_BACKED_DISK 1
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#define RAMDISK_TYPE_FILE_BACKED_VOLUME 2
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#define RAMDISK_TYPE_BOOT_DISK 3
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#define RAMDISK_TYPE_VIRTUAL_FLOPPY 4
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#define RAMDISK_IS_FILE_BACKED(_type) ((_type) <= RAMDISK_TYPE_FILE_BACKED_VOLUME)
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//
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// These are options related to the RAM disk.
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//
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// Readonly - The disk is write-protected.
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// Fixed - The "media" in the "disk" is not removable.
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// NoDriveLetter - No drive letter should be assigned to the disk.
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// NoDosDevice - No Ramdisk{GUID} DosDevices link should be created for the disk.
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// Hidden - No Volume{GUID} link should be created for the disk.
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//
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// Note that all of these options are ignored when creating a boot disk or
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// a virtual floppy. For a boot disk, all of the options are treated as FALSE,
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// except Fixed, which is TRUE. For a virtual floppy, Fixed and NoDriveLetter
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// are TRUE, and the rest are FALSE.
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//
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typedef struct _RAMDISK_CREATE_OPTIONS {
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ULONG Readonly : 1;
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ULONG Fixed : 1;
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ULONG NoDriveLetter : 1;
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ULONG NoDosDevice : 1;
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ULONG Hidden : 1;
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} RAMDISK_CREATE_OPTIONS, *PRAMDISK_CREATE_OPTIONS;
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typedef struct _RAMDISK_CREATE_INPUT {
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ULONG Version; // == sizeof(RAMDISK_CREATE_INPUT)
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//
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// DiskGuid is a GUID assigned to the disk. For file-backed disks, this
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// GUID should be assigned when the backing file is created, and should
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// stay the same for the life of the backing file.
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//
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GUID DiskGuid;
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//
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// DiskType is the RAM disk type. It is one of RAMDISK_TYPE_XXX above.
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//
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ULONG DiskType;
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//
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// Options is various options related to the disk, as described above.
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//
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RAMDISK_CREATE_OPTIONS Options;
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//
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// DiskLength is the length of the disk image. DiskOffset is the offset
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// from the start of the backing file or memory block to the actual start
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// of the disk image. (DiskLength does NOT include DiskOffset.)
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ULONGLONG DiskLength;
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ULONG DiskOffset;
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union {
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//
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// The following are used when the disk type is FILE_BACKED.
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//
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struct {
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//
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// ViewCount indicates, for file-backed disks, how many view
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// windows can be mapped simultaneously. ViewLength indicates the
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// length of each view.
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//
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ULONG ViewCount;
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ULONG ViewLength;
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//
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// FileName is the name of the backing file. The driver only
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// touches the part of this file that is specified by DiskOffset
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// and DiskLength.
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//
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WCHAR FileName[1];
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} ;
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//
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// The following are used when the disk type is BOOT_DISK.
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//
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struct {
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//
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// BasePage is the starting physical page of the memory region
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// containing the disk image. The driver only touches the part
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// of this region that is specified by DiskOffset and DiskLength.
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//
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ULONG_PTR BasePage;
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//
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// DriveLetter is the drive letter to assign to the boot device.
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// This is done directly by the driver, not by mountmgr.
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//
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WCHAR DriveLetter;
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} ;
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//
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// The following are used when the disk type is VIRTUAL_FLOPPY.
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//
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struct {
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//
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// BaseAddress is the starting virtual address of the memory region
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// containing the disk image. The virtual address must be mapped in
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// system space (e.g., pool). The driver only touches the part of
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// this region that is specified by DiskOffset and DiskLength.
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//
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PVOID BaseAddress;
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} ;
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} ;
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} RAMDISK_CREATE_INPUT, *PRAMDISK_CREATE_INPUT;
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//
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// FSCTL_QUERY_RAM_DISK
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//
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// This IOCTL is used to retrieve information about an existing RAMDISK device.
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//
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typedef struct _RAMDISK_QUERY_INPUT {
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ULONG Version; // == sizeof(RAMDISK_QUERY_INPUT)
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//
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// DiskGuid specifies the DiskGuid assigned to the disk at creation time.
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//
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GUID DiskGuid;
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} RAMDISK_QUERY_INPUT, *PRAMDISK_QUERY_INPUT;
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typedef struct _RAMDISK_QUERY_OUTPUT {
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//
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// This unnamed field returns the creation parameters for the disk.
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//
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struct _RAMDISK_CREATE_INPUT ;
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} RAMDISK_QUERY_OUTPUT, *PRAMDISK_QUERY_OUTPUT;
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//
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// FSCTL_MARK_RAM_DISK_FOR_DELETION
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//
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// This IOCTL is used to mark a RAMDISK device for deletion. It doesn't
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// actually delete the device. The program doing the deletion must
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// subsequently call CM_Query_And_Remove_SubTree() to delete the device.
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// The purpose of the IOCTL is to indicate to the driver that the PnP
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// removal sequence that comes down is a real deletion, not just user-mode
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// PnP temporarily stopping the device.
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//
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typedef struct _RAMDISK_MARK_FOR_DELETION_INPUT {
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ULONG Version; // == sizeof(RAMDISK_MARK_DISK_FOR_DELETION_INPUT)
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//
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// DiskGuid specifies the DiskGuid assigned to the disk at creation time.
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//
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GUID DiskGuid;
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} RAMDISK_MARK_FOR_DELETION_INPUT, *PRAMDISK_MARK_FOR_DELETION_INPUT;
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#endif // _NTDDRAMD_
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//
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// Note: The remainder of this file is outside of the #if !defined(_NTDDRAMD_).
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// This allows ntddramd.h to be included again after including initguid.h,
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// thus turning the DEFINE_GUIDs below into data initializers, not just
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// extern declarations.
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//
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// GUID_BUS_TYPE_RAMDISK is the GUID for the RAM disk "bus".
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//
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// RamdiskBusInterface is the GUID for the RAM disk bus enumerator device's
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// device interface.
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//
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// RamdiskDiskInterface is the GUID for the device interface for RAM disk
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// devices that are emulating disks. (RAM disk devices that are emulating
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// volumes are given MOUNTDEV_MOUNTED_DEVICE_GUID.)
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//
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// RamdiskBootDiskGuid is the GUID for the device instance for the boot disk.
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// This is a static ID so that disk image preparation can pre-expose
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// the boot disk device to PnP, avoiding PnP trying to install the
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// device at boot time.
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//
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DEFINE_GUID( GUID_BUS_TYPE_RAMDISK, 0x9D6D66A6, 0x0B0C, 0x4563, 0x90, 0x77, 0xA0, 0xE9, 0xA7, 0x95, 0x5A, 0xE4);
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DEFINE_GUID( RamdiskBusInterface, 0x5DC52DF0, 0x2F8A, 0x410F, 0x80, 0xE4, 0x05, 0xF8, 0x10, 0xE7, 0xAB, 0x8A);
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DEFINE_GUID( RamdiskDiskInterface, 0x31D909F0, 0x2CDF, 0x4A20, 0x9E, 0xD4, 0x7D, 0x65, 0x47, 0x6C, 0xA7, 0x68);
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DEFINE_GUID( RamdiskBootDiskGuid, 0xD9B257FC, 0x684E, 0x4DCB, 0xAB, 0x79, 0x03, 0xCF, 0xA2, 0xF6, 0xB7, 0x50);
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