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PLIC: priority/threshold are really WARL (RWSPECIAL). Explain why.

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This commit is contained in:
Megan Wachs 2018-03-05 16:10:05 -08:00
parent 41d1a62713
commit 4256d99a9b
1 changed files with 6 additions and 3 deletions
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9
src/main/scala/devices/tilelink/Plic.scala
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@ -169,7 +169,8 @@ class TLPLIC(params: PLICParams, beatBytes: Int)(implicit p: Parameters) extends
}
def priorityRegDesc(i: Int) = if (i > 0) {
RegFieldDesc(s"priority_$i", s"Acting priority of interrupt source $i", reset=if (nPriorities > 0) None else Some(1))
RegFieldDesc(s"priority_$i", s"Acting priority of interrupt source $i",
reset=if (nPriorities > 0) None else Some(1), access=RegFieldAccessType.RWSPECIAL)
} else {
RegFieldDesc("reserved", "", reset=Some(0), access=RegFieldAccessType.R)
}
@ -180,7 +181,8 @@ class TLPLIC(params: PLICParams, beatBytes: Int)(implicit p: Parameters) extends
}
def priorityRegField(x: UInt, i: Int) = if (nPriorities > 0) RegField(32, x, priorityRegDesc(i)) else RegField.r(32, x, priorityRegDesc(i))
val priorityRegFields = Seq(PLICConsts.priorityBase -> RegFieldGroup("priority", Some("Acting priorities of each interrupt source. 32 bits for each interrupt source."),
val priorityRegFields = Seq(PLICConsts.priorityBase -> RegFieldGroup("priority",
Some(s"Acting priorities of each interrupt source. Maximum legal value is ${nPriorities}. 32 bits for each interrupt source."),
priority.zipWithIndex.map{case (p, i) => priorityRegField(p, i)}))
val pendingRegFields = Seq(PLICConsts.pendingBase -> RegFieldGroup("pending", Some("Pending Bit Array. 1 Bit for each interrupt source."),
pending.zipWithIndex.map{case (b, i) => RegField.r(1, b, pendingRegDesc(i))}))
@ -226,7 +228,8 @@ class TLPLIC(params: PLICParams, beatBytes: Int)(implicit p: Parameters) extends
g.complete := c
}
def thresholdRegDesc(i: Int) = RegFieldDesc(s"threshold_$i", s"Interrupt & claim threshold for target $i", reset=if (nPriorities > 0) None else Some(1))
def thresholdRegDesc(i: Int) = RegFieldDesc(s"threshold_$i", s"Interrupt & claim threshold for target $i. Maximum value is ${nPriorities}.",
reset=if (nPriorities > 0) None else Some(1), access=RegFieldAccessType.RWSPECIAL)
def thresholdRegField(x: UInt, i: Int) = if (nPriorities > 0) RegField(32, x, thresholdRegDesc(i)) else RegField.r(32, x, thresholdRegDesc(i))
val hartRegFields = Seq.tabulate(nHarts) { i =>