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BusBlocker: parameterize page granularity

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This commit is contained in:
Wesley W. Terpstra 2017-08-08 17:10:01 -07:00
parent 010ba94474
commit a9b1410f01
1 changed files with 9 additions and 8 deletions
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17
src/main/scala/devices/tilelink/BusBlocker.scala
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@ -16,6 +16,7 @@ case class BusBlockerParams(
pmpRegisters: Int)
{
val page = 4096
val pageBits = log2Ceil(page)
val size = (((pmpRegisters * 8) + page - 1) / page) * page
require (pmpRegisters > 0)
@ -25,18 +26,18 @@ case class BusBlockerParams(
require (deviceBeatBytes > 0 && isPow2(deviceBeatBytes))
}
case class DevicePMPParams(addressBits: Int)
case class DevicePMPParams(addressBits: Int, pageBits: Int)
class DevicePMP(params: DevicePMPParams) extends GenericParameterizedBundle(params)
{
require (params.addressBits > 12)
require (params.addressBits > params.pageBits)
val l = UInt(width = 1) // locked
val a = UInt(width = 1) // LSB of A (0=disabled, 1=TOR)
val r = UInt(width = 1)
val w = UInt(width = 1)
val addr_hi = UInt(width = params.addressBits-12)
def address = Cat(addr_hi, UInt(0, width=12))
val addr_hi = UInt(width = params.addressBits-params.pageBits)
def address = Cat(addr_hi, UInt(0, width=params.pageBits))
def blockPriorAddress = l(0) && a(0)
def fields(blockAddress: Bool): Seq[RegField] = {
@ -47,7 +48,7 @@ class DevicePMP(params: DevicePMPParams) extends GenericParameterizedBundle(para
}))
Seq(
RegField(10),
field(params.addressBits-12, addr_hi, l(0) || blockAddress),
field(params.addressBits-params.pageBits, addr_hi, l(0) || blockAddress),
RegField(56 - (params.addressBits-2)),
field(1, r),
field(1, w),
@ -60,8 +61,8 @@ class DevicePMP(params: DevicePMPParams) extends GenericParameterizedBundle(para
object DevicePMP
{
def apply(addressBits: Int) = {
val out = Wire(new DevicePMP(DevicePMPParams(addressBits)))
def apply(addressBits: Int, pageBits: Int) = {
val out = Wire(new DevicePMP(DevicePMPParams(addressBits, pageBits)))
out.l := UInt(0)
out.a := UInt(0)
out.r := UInt(0)
@ -88,7 +89,7 @@ class BusBlocker(params: BusBlockerParams)(implicit p: Parameters) extends TLBus
// We need to be able to represent +1 larger than the largest populated address
val addressBits = log2Ceil(nodeOut.edgesOut(0).manager.maxAddress+1+1)
val pmps = RegInit(Vec.fill(params.pmpRegisters) { DevicePMP(addressBits) })
val pmps = RegInit(Vec.fill(params.pmpRegisters) { DevicePMP(addressBits, params.pageBits) })
val blocks = pmps.tail.map(_.blockPriorAddress) :+ Bool(false)
controlNode.regmap(0 -> (pmps zip blocks).map { case (p, b) => p.fields(b) }.toList.flatten)