Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Field
Interrupt Controller
Structure[n]
Byte
Length
Byte
Offset
Description
— 44 A list of interrupt controller structures for this implementation. This
list will contain all of the structures from Table 5-46 needed to
support this platform. These structures are described in the
following sections.
Table 5-45 Multiple APIC Flags
Multiple APIC
Flags
Bit
Length
Bit
Offset
Description
PCAT_COMPAT 1 0 A one indicates that the system also has a PC-AT-compatible
dual-8259 setup. The 8259 vectors must be disabled (that is,
masked) when enabling the ACPI APIC operation.
Reserved 31 1 This value is zero.
Immediately after the Flags value in the MADT is a list of interrupt controller structures that declare
the interrupt features of the machine. The first byte of each structure declares the type of that
structure and the second byte declares the length of that structure.
Table 5-46 Interrupt Controller Structure Types
Value Description
0 Processor Local APIC
1 I/O APIC
2 Interrupt Source Override
3 Non-maskable Interrupt Source (NMI)
4 Local APIC NMI
5 Local APIC Address Override
6 I/O SAPIC
7 Local SAPIC
8 Platform Interrupt Sources
9 Processor Local x2APIC
0xA
Local x2APIC NMI
0xB
GICC CPU Interface Structure
0xC
GICD GIC Distributor Structure
0xD
GICv2m MSI Frame
0xE
GICR Redistributor Structure
0xF
GIC Interrupt Translation Service (ITS) Structure
0x10-0x7F Reserved. OSPM skips structures of the reserved type.
0x80-0xFF Reserved for OEM use
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