Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
19.6.7 BankField (Declare Bank/Data Field)
Syntax
BankField (RegionName, BankName, BankValue, AccessType, LockRule, UpdateRule)
{FieldUnitList}
Arguments
RegionName is the name of the host Operation Region. BankName is the name of the bank selection
register.
Accessing the contents of a banked field data object will occur automatically through the proper
bank setting, with synchronization occurring on the operation region that contains the BankName
data variable, and on the Global Lock if specified by the LockRule.
The AccessType, LockRule, UpdateRule, and FieldUnitList are the same format as the Field
operator.
Description
This operator creates data field objects. The contents of the created objects are obtained by a
reference to a bank selection register.
This encoding is used to define named data field objects whose data values are fields within a larger
object selected by a bank-selected register.
Example
The following is a block of ASL sample code using BankField:
• Creates a 4-bit bank-selected register in system I/O space.
• Creates overlapping fields in the same system I/O space that are selected via the bank register.
//
// Define a 256-byte operational region in SystemIO space
// and name it GIO0
OperationRegion (GIO0, SystemIO, 0x125, 0x100)
// Create some fields in GIO including a 4-bit bank select register
Field (GIO0, ByteAcc, NoLock, Preserve) {
GLB1, 1,
GLB2, 1,
Offset (1), // Move to offset for byte 1
BNK1, 4
}
// Create FET0 & FET1 in bank 0 at byte offset 0x30
BankField (GIO0, BNK1, 0, ByteAcc, NoLock, Preserve) {
Offset (0x30),
FET0, 1,
FET1, 1
}
812 April, 2015 Version 6.0