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Implement bus error unit

This commit is contained in:
Andrew Waterman 2017-09-15 18:46:19 -07:00
parent ed18acaae0
commit 79dab487fc

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// See LICENSE.SiFive for license details.
package freechips.rocketchip.rocket
import Chisel._
import Chisel.ImplicitConversions._
import chisel3.util.Valid
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.util._
import freechips.rocketchip.tile._
import freechips.rocketchip.diplomacy._
import freechips.rocketchip.regmapper._
import freechips.rocketchip.tilelink._
trait BusErrors extends Bundle {
def toErrorList: List[Option[Valid[UInt]]]
}
class L1BusErrors(implicit p: Parameters) extends CoreBundle()(p) with BusErrors {
val icache = new ICacheErrors
val dcache = new DCacheErrors
def toErrorList =
List(None, None, icache.correctable, icache.uncorrectable,
None, None, dcache.correctable, dcache.uncorrectable)
}
class BusErrorUnit[T <: BusErrors](t: => T, addr: BigInt)(implicit p: Parameters) extends LazyModule {
val regWidth = 64
val size = 64
val device = new SimpleDevice("bus-error-unit", Seq("sifive,buserror0"))
val intNode = IntSourceNode(IntSourcePortSimple(resources = device.int))
val node = TLRegisterNode(
address = Seq(AddressSet(addr, size-1)),
device = device,
beatBytes = p(XLen)/8)
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val tl = node.bundleIn
val interrupt = intNode.bundleOut
val errors = t.flip
}
val sources = io.errors.toErrorList
val mask = sources.map(_.nonEmpty.B).asUInt
val cause = Reg(init = UInt(0, log2Ceil(sources.lastIndexWhere(_.nonEmpty) + 1)))
val value = Reg(UInt(width = sources.flatten.map(_.getWidth).max))
require(value.getWidth <= regWidth)
val enable = Reg(init = mask)
val interrupt = Reg(init = UInt(0, sources.size))
val accrued = Reg(init = UInt(0, sources.size))
accrued := accrued | sources.map(_.map(_.valid).getOrElse(false.B)).asUInt
for ((s, i) <- sources.zipWithIndex; if s.nonEmpty) {
when (s.get.valid && enable(i) && cause === 0) {
cause := i
value := s.get.bits
}
}
io.interrupt.head(0) := (accrued & interrupt).orR
def reg(r: UInt) = RegField(regWidth, r)
def maskedReg(r: UInt, m: UInt) = RegField(regWidth, r, RegWriteFn((v, d) => { when (v) { r := d & m }; true }))
node.regmap(
0 -> Seq(reg(cause),
reg(value),
maskedReg(enable, mask),
maskedReg(interrupt, mask),
maskedReg(accrued, mask)))
}
}