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