devmap(9E)

To enable a 64-bit driver and a 32-bit application to share memory, the binary layout generated by the 64-bit driver must be the same as consumed by the 32-bit application. The mapped memory being exported to the application might need to contain data-model-dependent data structures.

Few memory mapped devices face this problem because the device registers do not change size when the kernel data model changes. However, some pseudo-devices that export mappings to the user address space might want to export different data structures to ILP32 or LP64 applications. To determine whether there is a data model mismatch, devmap(9E) uses the model parameter to describe the data model expected by the application. The model parameter is set to one of the following:

• DDI_MODEL_ILP32 - The application uses the ILP32 data model.

• DDI_MODEL_LP64 - The application uses the LP64 data model.

The model parameter can be passed untranslated to the ddi_model_convert_from(9F) routine or to STRUCT_INIT().