44 lines
1.3 KiB
Scala
44 lines
1.3 KiB
Scala
// See LICENSE for license details.
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package uncore.coherence
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import Chisel._
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// This class encapsulates transformations on different directory information
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// storage formats
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abstract class DirectoryRepresentation(val width: Int) {
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def pop(prev: UInt, id: UInt): UInt
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def push(prev: UInt, id: UInt): UInt
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def flush: UInt
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def none(s: UInt): Bool
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def one(s: UInt): Bool
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def count(s: UInt): UInt
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def next(s: UInt): UInt
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def full(s: UInt): UInt
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}
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abstract trait HasDirectoryRepresentation {
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val dir: DirectoryRepresentation
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}
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class NullRepresentation(nClients: Int) extends DirectoryRepresentation(1) {
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def pop(prev: UInt, id: UInt) = UInt(0)
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def push(prev: UInt, id: UInt) = UInt(0)
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def flush = UInt(0)
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def none(s: UInt) = Bool(false)
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def one(s: UInt) = Bool(false)
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def count(s: UInt) = UInt(nClients)
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def next(s: UInt) = UInt(0)
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def full(s: UInt) = SInt(-1, width = nClients).asUInt
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}
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class FullRepresentation(nClients: Int) extends DirectoryRepresentation(nClients) {
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def pop(prev: UInt, id: UInt) = prev & ~UIntToOH(id)
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def push(prev: UInt, id: UInt) = prev | UIntToOH(id)
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def flush = UInt(0, width = width)
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def none(s: UInt) = s === UInt(0)
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def one(s: UInt) = PopCount(s) === UInt(1)
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def count(s: UInt) = PopCount(s)
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def next(s: UInt) = PriorityEncoder(s)
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def full(s: UInt) = s
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}
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