Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
19.5.32 DMA (DMA Resource Descriptor Macro)
Syntax
DMA (DmaType, IsBusMaster, DmaTransferSize, DescriptorName) {DmaChannelList} => Buffer
Arguments
DmaType specifies the type of DMA cycle: ISA compatible (Compatibility), EISA Type A
(TypeA), EISA Type B (TypeB) or EISA Type F (TypeF). The 2-bit field DescriptorName._TYP is
automatically created to refer to this portion of the resource descriptor, where ‘0’ is Compatibility,
‘1’ is TypeA, ‘2’ is TypeB and ‘3’ is TypeF.
IsBusMaster specifies whether this device can generate DMA bus master cycles (BusMaster) or not
(NotBusMaster). If nothing is specified, then BusMaster is assumed. The 1-bit field
DescriptorName._BM is automatically created to refer to this portion of the resource descriptor,
where ‘0’ is NotBusMaster and ‘1’ is BusMaster.
DmaTransferSize specifies the size of DMA cycles the device is capable of generating: 8-bit
(Transfer8), 16-bit (Transfer16) or both 8 and 16-bit (Transfer8_16). The 2-bit field
DescriptorName._SIZ is automatically created to refer to this portion of the resource descriptor,
where ‘0’ is Transfer8, ‘1’ is Transfer8_16 and ‘2’ is Transfer16.
DescriptorName is an optional argument that specifies a name for an integer constant that will be
created in the current scope that contains the offset of this resource descriptor within the current
resource template buffer. The predefined descriptor field names may be appended to this name to
access individual fields within the descriptor via the Buffer Field operators.
DmaChannelList is a comma-delimited list of integers in the range 0 through 7 that specify the DMA
channels used by the device. There may be no duplicates in the list.
Description
The DMA macro evaluates to a buffer which contains a DMA resource descriptor. The format of the
DMA resource descriptor can be found in “DMA Descriptor” (page 311). The macro is designed to
be used inside of a ResourceTemplate (page 794).
19.5.33 DWordIO (DWord IO Resource Descriptor Macro)
Syntax
DWordIO (ResourceUsage, IsMinFixed, IsMaxFixed, Decode, ISARanges, AddressGranularity,
AddressMinimum, AddressMaximum, AddressTranslation, RangeLength, ResourceSourceIndex,
ResourceSource, DescriptorName, TranslationType, TranslationDensity)
Arguments
ResourceUsage specifies whether the I/O range is consumed by this device (ResourceConsumer)
or passed on to child devices (ResourceProducer). If nothing is specified, then ResourceConsumer
is assumed.
IsMinFixed specifies whether the minimum address of this I/O range is fixed (MinFixed) or can be
changed (MinNotFixed). If nothing is specified, then MinNotFixed is assumed. The 1-bit field
Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 737