Advanced Configuration and Power Interface Specification

Device Configuration
Method(_EJ0, 1) { // Remove all power to device}
}
Device (S2F7) {
// Slot 2, Func#7 on bus P2P2
Name(_ADR,0x00030007)
Method(_EJ0, 1) { // Remove all power to device}
}
} // end P2P2
} // end PCI0
} // end Scope (\_SB)
OSPM will configure a PCI device on a card hot-plugged into slot 1 or slot 2, with a cache line size
of 32 (Notice this field is in DWORDs), latency timer of 64, enable SERR, but leave PERR alone.
6.2.9 _HPX (Hot Plug Parameter Extensions)
This optional object provides platform-specific information to the OSPM PCI driver component
responsible for configuring hot-add PCI, PCI-X, or PCI Express devices. The information conveyed
applies to the entire hierarchy downward from the scope containing the _HPX object. If another
_HPX object is encountered downstream, the settings conveyed by the lower-level object apply to
that scope downward.
OSPM uses the information returned by _HPX to determine how to configure PCI devices that are
hot-plugged into the system, and to configure devices not configured by the platform firmware
during initial system boot. The _HPX object is placed within the scope of a PCI-compatible bus (see
the second Note below for restrictions) where this behavior is desired, such as a bus with hot-plug
slots. It returns a single package that contains one or more sub-packages, each containing a single
Setting Record. Each such Setting Record contains a Setting Type (INTEGER), a Revision number
(INTEGER) and type/revision specific contents.
The format of data returned by the _HPX object is extensible. The Setting Type and Revision
number determine the format of the Setting Record. OSPM ignores Setting Records of types that it
does not understand. A Setting Record with higher Revision number supersedes that with lower
revision number, however, the _HPX method can return both together, OSPM shall use the one with
highest revision number that it understands.
_HPX may return multiple types or Record Settings (each setting in a single sub-package.) OSPM is
responsible for detecting the type of hot plugged device and for applying the appropriate settings.
OSPM is also responsible for detecting the device / port type of the PCI Express device and applying
the appropriate settings provided. For example, the Secondary Uncorrectable Error Severity and
Secondary Uncorrectable Error Mask settings of Type 2 record are only applicable to PCI Express to
PCI-X/PCI Bridge whose device / port type is 1000b. Similarly, AER settings are only applicable to
hot plug PCI Express devices that support the optional AER capability.
Arguments:
None
Return Value:
A variable-length Package containing a list of Packages, each containing a single PCI or PCI-X
Record Setting as described below
The _HPX object supersedes the _HPP object. If the _HPP and _HPX objects exist within a device’s
scope, OSPM will only evaluate the _HPX object.
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