Processor Family Specific DKI Services

Processor family specific DKI services are available only on a given processor family, and should be used only by the drivers servicing devices directly connected to the local CPU bus. Drivers using these DKI services become "processor specific" and therefore can not be considered common.

Note that the availability of services is different between processor families, and not all services are listed here. An overview of commonly available services is provided below. For an accurate indication of what services are provided for each processor family see the "Processor-Specific DKI Services" section in Appendix A (or the appropriate 9DKI man pages).

Depending on the processor family architecture, the family-specific DKIs may offer the following services:

Interrupt Management

All processor families offer DKI services to manage interrupts. These services allow the driver to perform the following tasks:

• attach a handler to a given interrupt

• mask an interrupt attached to a handler

• unmask an interrupt attached to a handler

• detach an interrupt handler

Cache management

Allows the host bus to manage memory coherence for DMA purposes by flushing and/or invalidating caches

Specific I/O services

Provides interface to processor specific I/O instructions, managing:

• I/O ports

• Synchronization of memory mapped I/O operations

Physical to virtual memory mapping

allows device drivers to map physical space to virtual memory space. These services are used mainly by the host bus driver to map bus I/O space or DMA memory.