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When a device is enabled for wake-up, the PCI driver writes to PCI-PM registers to allow the device to fire PME ACPI will also take an action, see the next section. Finally, when ACPI decides that the PCI bus is waking the machine, the PCI driver scans PCI configuration space looking for which device is claiming PME, disables PME in that device, and notifies the driver for this device.

Bus drivers: Bus drivers are responsible for enumerating, configuring, and controlling devices. For PCI-PM, the PCI driver is responsible for studying the PCI-PM registers to determine the capabilities of the hardware. When POWER IRPs request power state changes, the PCI driver writes to the PCI power management registers to set the hardware into various Dx states.

This report clarifies some confusion that sellers have experienced about how hardware that complies with PCI Power Management PCI-PM interacts with device drivers in the operating system and about how PCI-PM integrates with ACPI. For more information, see

PCI-PM registers are strictly the domain of the PCI driver--the IHV s device driver does not have to access any of these registers. Doing so would cause the system to not work reliably. The device driver s duty is to carry out only proprietary actions.

PCI driver: Scans configuration area looking for any devices with a set PME status bit. For each device, it disables PME and completes the WAIT_WAKE IRP for that device to inform the driver that it's asserting wake-up. The PCI driver stops scanning for wake apparatus when it's made a complete pass through all PCI devices having not found any claiming PME and if PME stops being maintained.

The OnNow architecture is a layered architecture, managing the integration of the device driver, PCI driver, and ACPI driver and ASL naturally. These scenarios show the sequence in which drivers are called to deal with these devices.

This discussion assumes that you're familiar with how Windows Driver Model WDM drivers handle power management events, as described in the current Windows DDK. Generally speaking, the responsibilities for device drivers are as follows:

ACPI driver: Wakes and scans the GPE status bits for wake-up occasions, disabling GPEs for set GPE status bits, and running any _Lxx or _Exx methods connected with set GPE pieces. In response to a wake-up notification on the PCI bus, the ACPI driver will complete the PCI driver s WAIT_WAKE IRP to notify the PCI driver it is waking the system.

Some devices, especially motherboard video devices in portables, may require both PCI Power Management as well as ACPI Source Language Assembler ASL to fully power manage the device. The PCI Power Management registers would control the internal state of a device, such as internal clocks and power planes. ASL would control the external state, such as external clocks and power planes, or in the case of video controllers, ASL would control the movie backlights. Notice that PCI-PM and ASL can only be combined on motherboard devices.

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