36 lines
1.0 KiB
Scala
36 lines
1.0 KiB
Scala
// See LICENSE.Berkeley for license details.
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// See LICENSE.SiFive for license details.
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package rocket
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import util._
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import Chisel._
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class EventSet(gate: (UInt, UInt) => Bool, events: Seq[(String, () => Bool)]) {
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def size = events.size
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def hits = events.map(_._2()).asUInt
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def check(mask: UInt) = gate(mask, hits)
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}
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class EventSets(eventSets: Seq[EventSet]) {
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def maskEventSelector(eventSel: UInt): UInt = {
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// allow full associativity between counters and event sets (for now?)
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val setMask = (BigInt(1) << log2Ceil(eventSets.size)) - 1
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val maskMask = ((BigInt(1) << eventSets.map(_.size).max) - 1) << eventSetIdBits
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eventSel & (setMask | maskMask).U
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}
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private def decode(counter: UInt): (UInt, UInt) = {
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require(eventSets.size <= (1 << eventSetIdBits))
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(counter(log2Ceil(eventSets.size)-1, 0), counter >> eventSetIdBits)
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}
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def evaluate(eventSel: UInt): Bool = {
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val (set, mask) = decode(eventSel)
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val sets = eventSets map (_ check mask)
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sets(set)
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}
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private def eventSetIdBits = 8
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}
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