Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
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 Memory24 macro evaluates to a buffer which contains an 24-bit memory descriptor. The
format of the 24-bit memory descriptor can be found in “24-Bit Memory Range Descriptor ”
(page 350). The macro is designed to be used inside of a ResourceTemplate (page 882).
Note: The use of Memory24 is deprecated and should not be used in new designs.
19.6.80 Memory32 (Memory Resource Descriptor Macro)
Syntax
Memory32 (ReadAndWrite, AddressMinimum, AddressMaximum, AddressAlignment,
RangeLength, DescriptorName)
Arguments
ReadAndWrite specifies whether or not the memory region is read-only (ReadOnly) or read/write
(ReadWrite). If nothing is specified, then ReadWrite is assumed. The 1-bit field
DescriptorName._RW is automatically created to refer to this portion of the resource descriptor,
where ‘1’ is ReadWrite and ‘0’ is ReadOnly.
AddressMinimum evaluates to a 32-bit integer that specifies the lowest possible base address of the
memory range. The value must be an even multiple of AddressAlignment. The 32-bit field
DescriptorName._MIN is automatically created to refer to this portion of the resource descriptor.
AddressMaximum evaluates to a 32-bit integer that specifies the highest possible base address of the
memory range. The value must be an even multiple of AddressAlignment. The 32-bit field
DescriptorName._MAX is automatically created to refer to this portion of the resource descriptor.
AddressAlignment evaluates to a 32-bit integer that specifies the required alignment for the memory
range. The address selected must be an even multiple of this value. The 32-bit field DescriptorName.
_ALN is automatically created to refer to this portion of the resource descriptor.
RangeLength evaluates to a 32-bit integer that specifies the total number of bytes decoded in the
memory range. The 32-bit field DescriptorName. _LEN is automatically created to refer to this
portion of the resource descriptor. The range length provides the length of the memory range in 1
byte blocks.
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 Memory32 macro evaluates to a buffer which contains a 32-bit memory descriptor, which
describes a memory range with a minimum, a maximum and an alignment. The format of the 32-bit
memory descriptor can be found in “32-Bit Memory Range Descriptor ” (page 351). The macro is
designed to be used inside of a ResourceTemplate (page 882).
Version 6.0 861