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00001 /*
00002  * PROJECT:         ReactOS Kernel
00003  * LICENSE:         BSD - See COPYING.ARM in the top level directory
00004  * FILE:            include/reactos/drivers/ntddrdsk.h
00005  * PURPOSE:         Constants and types for accessing the RAM disk device
00006  * PROGRAMMERS:     ReactOS Portable Systems Group
00007  */
00008 #ifndef _NTDDRDSK_H_
00009 #define _NTDDRDSK_H_
00010 
00011 #if _MSC_VER > 1000
00012 #pragma once
00013 #endif
00014 
00015 #ifdef __cplusplus1
00016 extern "C" {
00017 #endif
00018 
00019 //
00020 // This guid identifies a RAM disk volume
00021 //
00022 DEFINE_GUID(RAMDISK_BOOTDISK_GUID, 0xd9b257fc, 0x684e, 0x4dcb, 0x79, 0xab, 0xf6, 0xa2, 0xcf, 0x03, 0x50, 0xb7);
00023 
00024 //
00025 // Device Name - this string is the name of the device.  It is the name
00026 // that should be passed to NtOpenFile when accessing the device.
00027 //
00028 // Note:  For devices that support multiple units, it should be suffixed
00029 //        with the Ascii representation of the unit number.
00030 //
00031 #define DD_RAMDISK_DEVICE_NAME            "\\Device\\Ramdisk"
00032 
00033 //
00034 // IoControlCode values for ramdisk devices.
00035 //
00036 #define IOCTL_RAMDISK_BASE                FILE_DEVICE_VIRTUAL_DISK
00037 #define FSCTL_CREATE_RAM_DISK             CTL_CODE(FILE_DEVICE_VIRTUAL_DISK, 0x0000, METHOD_BUFFERED, FILE_ANY_ACCESS)
00038 
00039 //
00040 // Disk Types
00041 //
00042 #define RAMDISK_REGISTRY_DISK             1 // Loaded from the registry
00043 #define RAMDISK_MEMORY_MAPPED_DISK        2 // Loaded from the registry
00044 #define RAMDISK_BOOT_DISK                 3 // Used as a boot device
00045 #define RAMDISK_WIM_DISK                  4 // Used as an installation device
00046 
00047 //
00048 // Options when creating a ramdisk
00049 //
00050 typedef struct _RAMDISK_CREATE_OPTIONS
00051 {
00052     ULONG Readonly:1;
00053     ULONG Fixed:1;
00054     ULONG NoDriveLetter:1;
00055     ULONG NoDosDevice:1;
00056     ULONG Hidden:1;
00057     ULONG ExportAsCd:1;
00058 } RAMDISK_CREATE_OPTIONS;
00059 
00060 //
00061 // This structure is passed in for a FSCTL_CREATE_RAM_DISK call
00062 //
00063 typedef struct _RAMDISK_CREATE_INPUT
00064 {
00065     ULONG Version;
00066     GUID DiskGuid;
00067     ULONG DiskType;
00068     RAMDISK_CREATE_OPTIONS Options;
00069     LARGE_INTEGER DiskLength;
00070     LONG DiskOffset;
00071     union
00072     {
00073         struct
00074         {
00075             ULONG ViewCount;
00076             SIZE_T ViewLength;
00077             WCHAR FileName[ANYSIZE_ARRAY];
00078         };
00079         struct
00080         {
00081             ULONG_PTR BasePage;
00082             WCHAR DriveLetter;
00083         };
00084         PVOID BaseAddress;
00085     };
00086 } RAMDISK_CREATE_INPUT, *PRAMDISK_CREATE_INPUT;
00087 
00088 #ifdef __cplusplus
00089 }
00090 #endif
00091 
00092 #endif // _NTDDRDSK_H_
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