Kernel Plug And Play In Windows Vista.pptVIP

Kernel Plug And Play In Windows Vista Allen MarshallLead Program ManagerWindows Core Platform ArchitectureMicrosoft Corporation Agenda Enhanced scenario support Device custom properties Device ejection support Asynchronous PnP operations Kernel PnP diagnostic tracing Supporting hardware evolution Legacy reduction Interrupt enhancements Large system support Multilevel rebalance Machine.inf logistics Common BIOS errata that impact PnP Background Windows Vista features continued advancement of Windows kernel PnP support, driven by Evolving hardware technologies PCI Express NUMA relations in many systems Mainstream adoption of advanced server configurations Hot add memory Continued development to enhance existing and enable new scenarios Enabling faster system startup Improved diagnostics, manageability Enhanced Scenario SupportDevice properties in Windows Today, Windows provides the kernel DDI IoOpenDeviceRegistryKey() Returns a device or driver registry key Drivers can access registry data using standard registry DDIs Setup information Name of the device’s PDO Use of a DDI is preferred to accessing the registry directly Allows better abstraction in the operating system Backing store location may change in the future Windows Vista will extend this to allow custom device properties to be both set and retrieved for a device node Enhanced Scenario SupportCustom property DDIs in Windows Vista This offers several practical applications The device’s bus driver can set these custom device properties on the device’s devnode The device may store useful information in its firmware, and make this available to the OS Icon image Device description string Manufacturer’s web site URL Device driver Kernel-mode IoSetDevicePropertyData() IoGetDevicePropertyData() User-mode SetupDi…() Enhanced Scenario SupportDevice custom property DDIs Function prototypes are declared in wdm.h Bus drivers should not call these DDIs until they have received a IRP_MN_QUERY_RESOURCE_REQUIREMENTS