Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
DefinitionBlock ("ssdt.aml", "SSDT", 2, "X", "Y", 0x00000001)
{
External (\_SB.PCI0, DeviceObj)
}
Scope (\_SB.PCI0)
{
}
19.6.45 Fatal (Fatal Error Check)
Syntax
Fatal (Type, Code, Arg)
Arguments
This operation is used to inform the OS that there has been an OEM-defined fatal error.
Description
In response, the OS must log the fatal event and perform a controlled OS shutdown in a timely
fashion.
19.6.46 Field (Declare Field Objects)
Syntax
Field (RegionName, AccessType, LockRule, UpdateRule) {FieldUnitList}
Arguments
RegionName is a namestring that refers to the host operation region.
AccessType defines the default access width of the field definition and is any one of the following:
AnyAcc, ByteAcc, WordAcc, DWordAcc, or QWordAcc. In general, accesses within the parent
object are performed naturally aligned. If desired, AccessType set to a value other than AnyAcc can
be used to force minimum access width. Notice that the parent object must be able to accommodate
the AccessType width. For example, an access type of WordAcc cannot read the last byte of an oddlength
operation region. The exceptions to natural alignment are the access types used for a nonlinear
SMBus device. These will be discussed in detail below. Not all access types are meaningful
for every type of operational region.
LockRule is a flag that indicates whether the Global Lock is to be used when accessing this field and
is one of the following: Lock or NoLock. If LockRule is set to Lock, accesses to modify the
component data objects will acquire and release the Global Lock. If both types of locking occur, the
Global Lock is acquired after the parent object Mutex.
On Hardware-reduced ACPI platforms, Lock is not supported.
UpdateRule is used to specify how the unmodified bits of a field are treated and is any one of the
following: Preserve, WriteAsOnes, or WriteAsZeros. For example, if a field defines a component
data object of 4 bits in the middle of a WordAcc region, when those 4 bits are modified the
UpdateRule specifies how the other 12 bits are treated.
Version 6.0 837