Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
automatically created in order to refer to this portion of the resource descriptor. See Address Space
Id (page 368) for more information, including a list of valid values and their meanings.
RegisterBitWidth evaluates to an 8-bit integer that specifies the number of bits in the register. The 8-
bit field DescriptorName. _RBW is automatically created in order to refer to this portion of the
resource descriptor. See _RBW (page 368) for more information.
RegisterBitOffset evaluates to an 8-bit integer that specifies the offset in bits from the start of the
register indicated by RegisterAddress. The 8-bit field DescriptorName. _RBO is automatically
created in order to refer to this portion of the resource descriptor. See _RBO (page 368) for more
information.
RegisterAddress evaluates to a 64-bit integer that specifies the register address. The 64-bit field
DescriptorName. _ADR is automatically created in order to refer to this portion of the resource
descriptor. See _ADR (page 368) for more information.
AccessSize evaluates to an 8-bit integer that specifies the size of data values used when accessing the
address space as follows:
0 - Undefined (legacy)
1 - Byte access
2 - Word access
3 - DWord access
4 - QWord access
The 8-bit field DescriptorName. _ASZ is automatically created in order to refer to this portion of the
resource descriptor. See _ASZ (page 368) for more information. For backwards compatibility, the
AccesSize parameter is optional when invoking the Register macro. If the AccessSize parameter is
not supplied then the AccessSize field will be set to zero. In this case, OSPM will assume the access
size.
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.
Description
The Register macro evaluates to a buffer which contains a generic register resource descriptor. The
format of the generic register resource descriptor can be found in “Generic Register Descriptor ”
(page 368). The macro is designed to be used inside of a ResourceTemplate (page 882).
19.6.109 Release (Release a Mutex Synchronization Object)
Syntax
Release (SyncObject)
Arguments
SynchObject must be a mutex synchronization object.
Version 6.0 881