Three access maps are provided, one for each of the possible access requests that can be generated by a processor. Internally the core object takes the request, determines the approperiate attached address space that it should handle it passes it on. Device Introduction As explained in earlier sections, the device, device instance, property and interrupts lie at the heart of PSIM's device model. In the below a synopsis of the device object and the operations it supports are given. Relationships A device is able to determine its relationship to other devices within the tree.
Properties Attached to a device are a number of properties.
A device is able to iterate over or query and set a properties value. Instances As with IEEE1275, a device can be opened, creating an instance. Instances provide more abstract interfaces to the underlying hardware. For example, the instance methods for a disk may include code that is able to interpret file systems found on disks. Such methods would there for allow the manipulation of files on the disks file system.