Transition to full driver

Once the kernel is running, your full driver process can run a transition from the minidriver to the full driver. The full driver can take control of the hardware device and the minidriver can then gracefully exit. In order to perform the transition, the full driver does the following:

• locates the minidriver entry in the system page
• maps the minidriver data area into its memory space
• attaches to the device's interrupt.

The minidriver is called with a state of MDRIVER_INTR_ATTACH>. At this point, the minidriver should do any cleanup necessary and disable the device interrupt. The minidriver handler then can return a nonzero value, which indicates that it should exit. The successful transition occurs when:

• the full driver's interrupt attach succeeds and the full driver reenables the device interrupt
• the full driver begins to handle the device and any stored device data is read from the minidriver data area.