devmap() Entry Point

int xxdevmap(dev_t dev, devmap_cookie_t handle, offset_t off,
     size_t len, size_t *maplen, uint_t model);

This entry point is called to export device memory or kernel memory to user applications. devmap(9E) is called from devmap_setup(9F) inside segmap(9E) or on behalf of ddi_devmap_segmap(9F). See Chapter 12, Mapping Device and Kernel Memory and Chapter 13, Device Context Management for details.