Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Proximity Domain 0 1 2 3 4
1 15 10 16 24 21
2 20 16 10 12 14
3 18 24 12 10 23
4 17 21 14 23 10
The new node’s _SLI object would evaluate to a buffer containing [17,21,14,23,10,17,21,14,23,10].
Note: Some systems support interleave memory across the nodes. The SLIT representation of these
systems is implementation specific.
6.2.16 _SRS (Set Resource Settings)
This optional control method takes one byte stream argument that specifies a new resource
allocation for a device. The resource descriptors in the byte stream argument must be specified
exactly as listed in the _CRS byte stream – meaning that the identical resource descriptors must
appear in the identical order, resulting in a buffer of exactly the same length. Optimizations such as
changing an IRQ descriptor to an IRQNoFlags descriptor (or vice-versa) must not be performed.
Similarly, changing StartDependentFn to StartDependentFnNoPri is not allowed. A _CRS object
can be used as a template to ensure that the descriptors are in the correct format. For more
information, see the _CRS object definition.
The settings must take effect before the _SRS control method returns.
This method must not reference any operation regions that have not been declared available by a
_REG method.
If the device is disabled, _SRS enables the device at the specified resources. _SRS is not used to
disable a device; use the _DIS control method instead.
Arguments: (1)
Arg0 – A Buffer containing a Resource Descriptor byte stream
Return Value:
None
6.2.17 _CCA (Cache Coherency Attribute)
The _CCA object returns whether or not a bus-master device supports hardware managed cache
coherency. Expected values are 0 to indicate it is not supported, and 1 to indicate that it is supported.
All other values are reserved.
On platforms for which existing default cache-coherency behavior of the OS is not adequate, _CCA
enables the OS to adapt to the differences. If used, _CCA must be included under all bus-mastercapable
devices defined as children of \_SB, to ensure that the operating system knows when it can
rely on hardware managed cache coherency. The value of _CCA is inherited by all descendants of
these devices, so it need not be repeated for their children devices and will be ignored by OSPM if it
is provided there. This includes slave devices on a shared DMA controller; thus these DMA
controllers must also be defined in the namespace under the System Bus and include a _CCA object.
328 April, 2015 Version 6.0