Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Offset Field Name Definition
Byte x Resource Source
Index
(Optional)
Only present if Resource Source (below) is present. This field gives an
index to the specific resource descriptor that this device consumes from in
the current resource template for the device object pointed to in Resource
Source.
String Resource Source (Optional)
If present, the device that uses this descriptor consumes its resources from
the resources produces by the named device object. If not present, the
device consumes its resources out of a global pool.
If not present, the device consumes this resource from its hierarchical
parent.
Note: Low true, level sensitive interrupts may be electrically shared, the process of how this might work
is beyond the scope of this specification.
If the OS is running using the 8259 interrupt model, only interrupt number values of 0-15 will be
used, and interrupt numbers greater than 15 will be ignored.
See Interrupt (page 851) for a description of the ASL macro that creates an Extended Interrupt
descriptor.
6.4.3.7 Generic Register Descriptor
Type 1, Large Item Name 0x2
The generic register descriptor describes the location of a fixed width register within any of the
ACPI-defined address spaces.
Table 6-217 Generic Register Descriptor Definition
Offset Field Name, ASL Field Name Definition
Byte 0 Generic Register Descriptor Value = 0x82 (10000010B)
Type = 1, Large item name = 0x02
Byte 1 Length, bits[7:0] Value = 0x0C (12)
Byte 2 Length, bits[15:8] Value = 0x00
Byte 3 Address Space ID,
_ASI
The address space where the data structure or
register exists. Defined values are:
0x00 System Memory
0x01 System I/O
0x02 PCI Configuration Space
0x03 Embedded Controller
0x04 SMBus
0x0A PCC
0x7F Functional Fixed Hardware
Byte 4 Register Bit Width,
_RBW
Indicates the register width in bits.
Byte 5
Register Bit Offset,
_RBO
Indicates the offset to the start of the register in bits
from the Register Address.
368 April, 2015 Version 6.0