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ACPI has a hot-plugging feature, and the current PCI interrupt routing
code is not capable of routing interrupts for devices that are on a
PCI-PCI bridge. This will require large modification to the current
device enumeration scheme in ACPI. We have proposed a scheme designed
so that existing drivers are not modified unless absolutely
necessary. The scheme is:
- Add a bus bridge enumerator driver (only have device_identify
bus method) for each bus bridge device that can be a descendant of
ACPI and appear as a namespace. In this method, add children to the
bus and register acpi_name-device_t table in the acpi driver. Then
evaluate _INI object after checking by _STA. Then the
driver install address space handler, etc.
- The manipulation to get ACPI_HANDLE, etc., is not done via
DEVMETHOD but by a direct function call. This may require module
dependency with the acpi driver, but if the driver wants to use
ACPI_HANDLE, it must depend on acpi. If a device other than ACPI is
used, it may not use ACPI_HANDLE to get information.
- Add acpi attachment for devices that can be attached to acpi
directly. The acpi-pcib driver is quite a different implement than
the nexus-pcib driver.
Next: User-land Interface
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Takanori Watanabe
2002-04-13