Difference between revisions of "USB Stack"

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== References ==
== References ==
* [http://www.usb.org/developers/docs/ USB.org specifications]
* [https://www.usb.org/documents USB.org specifications]
* [http://xenbits.xensource.com/ext/win-pvdrivers.hg XEN PV USB Drivers]
* [http://xenbits.xensource.com/ext/win-pvdrivers/ XEN PV USB Drivers]
* [http://msdn.microsoft.com/en-us/library/ff537858.aspx Roadmap for Developing USB Drivers]
* [http://msdn.microsoft.com/en-us/library/ff537858.aspx Roadmap for Developing USB Drivers] (No Archive Available)
* Windows Driver Kit (Driver Development Kit)
* Windows Driver Kit (Driver Development Kit)
* [http://www.microsoft.com/whdc/archive/USB2support.mspx?pf=true USB Driver Stack for Windows XP and later]
* [http://www.microsoft.com/whdc/archive/USB2support.mspx?pf=true USB Driver Stack for Windows XP and later] ([https://web.archive.org/web/20110324034537/http://msdn.microsoft.com/en-us/windows/hardware/gg463432.aspx Archived])
* [http://msdn.microsoft.com/en-us/library/ff539301.aspx USB Device Stack for Windows XP and later]
* [http://msdn.microsoft.com/en-us/library/ff539301.aspx USB Device Stack for Windows XP and later] (No Archive Available)
* [http://www.intel.com/technology/USB/download/xHCI_Specification_for_USB.pdf USB 3.0 xHCI specifications]
* [https://www.intel.com/content/www/us/en/products/docs/io/universal-serial-bus/ehci-specification-for-usb.html USB 3.0 xHCI specifications]
[[Category:ReactOS Components]]
[[Category:ReactOS Components]]

Revision as of 20:01, 29 October 2020

The USB stack is the component that provides the communication between USB devices and their respective drivers and applications. It consists of multiple files, each with a distinct function. The USB stack in ReactOS is currently limited. This page documents the development of the new USB stack. Development work on a USB 3 stack is in progress.

NOTE: There is a known issue with booting ReactOS from the internal HDD with a USB storage device connected which causes ROS to lose the boot device. Until this problem is fixed or a workaround is developed, please unplug any USB storage devices during boot!


The goal is to develop a USB stack which:

  • is USB 1.1 – 2.0 compliant
  • uses WDM (NT 5) API
  • is compatible with all USB devices and drivers (which adhere to the standard)

The entire stack will be fully documented and the implementation progress detailed on this page.


  • Primary Goal: USBHID (human input devices) and storage functionality working (Alpha).
  • Secondary Goal: Audio and other support added.
  • Beyond: testing and debugging.

Due to the complexity and size, no release dates will be provided as of now.


USB Core Status

  • There are 2 USB specifications for the USB 1.1 standard. Devices that are used in this standard are mice, keyboards, etc.
    • OHCI (Open Host Controller Interface Standard) – All transfers types are implemented (bulk, iso, control, interrupt)
    • UHCI (Universal Host Controller Interface Standard) – Totally missing. Though it should be do-able to use OHCI driver as a base and use Haiku driver
  • EHCI (Enhanced Host Controller Interface) – Implemented transfer types: bulk & control. Interrupt & Isochronous transfers are not implemented. Due to the missing transfer types, devices who utilize those transfer types will not be available.
  • USBHUB – driver for managing port and hubs – Implementation state is unknown – Michel Martin has more information on that

USB Mass Storage Support Status

USB Mass Storage is implemented in USBSTOR driver and is fully working. Tested in WinXP + USBEHCI + USBSTOR. Mass storage support requires bulk and control transfers, which are implemented in USBEHCI.

HID Status

The HID framework is built on 5 drivers

  • HIDUSB – this is the interface driver for the USB bus. Currently supported devices are mice. Basic keyboard support should also work currently.
  • HIDCLASS – this is the class driver for HIDUSB and others. Functionality for mice & keyboard is implemented, though support for sending output reports is not implemented.
  • MOUHID – mouse function driver for USB hid standard – Fully implemented and working.
  • KBDHID – keyboard function driver for the hid standard – 90% implemented, needs KbdHid_InsertScanCodes implemented for keyboard scan code dispatching to kbdclass and led status indicator support (which requires sending output reports).
  • HIDPARSE – driver for parsing report descriptors – functionality implemented for mice, keyboard support needs HidParser_TranslateUsage fully implemented for modifier state (caps lock, num lock, scroll lock).

What already works

  • Mouse support has been tested in WinXP with ReactOS USBOHCI + HIDUSB + HIDCLASS + MOUHID + HIDPARSE and is working. The USB + HID stack also works in ReactOS.
  • Basic Keyboard support is nearly ready.
  • USB Mass storage support – Needs mountmgr / partmgr driver implemented. Will also need mountvol and other missing PnP stuff. - needs a few more issues to be resolved

See Also