tilelink: add mask rom

src/main/scala/util/GeneratorUtils.scala

@@ -53,6 +53,21 @@ trait HasGeneratorUtilities {
     Driver.elaborate(gen)
   }
 
+  def enumerateROMs(circuit: Circuit): String = {
+    val res = new StringBuilder
+    val configs =
+      circuit.components flatMap { m =>
+        m.id match {
+          case rom: BlackBoxedROM => Some((rom.name, ROMGenerator.lookup(rom)))
+          case _ => None
+        }
+      }
+    configs foreach { case (name, c) =>
+      res append s"name ${name} depth ${c.depth} width ${c.width}\n"
+    }
+    res.toString
+  }
+
   def writeOutputFile(targetDir: String, fname: String, contents: String): File = {
     val f = new File(targetDir, fname) 
     val fw = new FileWriter(f)
@@ -103,6 +118,10 @@ trait GeneratorApp extends App with HasGeneratorUtilities {
     TestGeneration.addSuite(DefaultTestSuites.singleRegression)
   } 
 
+  def generateROMs {
+    writeOutputFile(td, s"$longName.rom.conf", enumerateROMs(circuit))
+  }
+
   /** Output files created as a side-effect of elaboration */
   def generateArtefacts {
     ElaborationArtefacts.files.foreach { case (extension, contents) =>

src/main/scala/util/ROMGenerator.scala

@@ -0,0 +1,35 @@
+// See LICENSE.SiFive for license details.
+
+package freechips.rocketchip.util
+
+import Chisel._
+import scala.collection.mutable.{HashMap}
+
+case class ROMConfig(name: String, depth: Int, width: Int)
+
+class BlackBoxedROM(c: ROMConfig) extends BlackBox {
+  val io = new Bundle {
+    val clock = Clock(INPUT)
+    val address = UInt(INPUT, log2Ceil(c.depth))
+    val oe = Bool(INPUT)
+    val me = Bool(INPUT)
+    val q = UInt(OUTPUT, c.width)
+  }
+
+  override def desiredName: String = c.name
+}
+
+object ROMGenerator {
+  private var finalized = false
+  private val roms = HashMap[BlackBoxedROM, ROMConfig]()
+  def apply(c: ROMConfig): BlackBoxedROM = {
+    require(!finalized)
+    val m = Module(new BlackBoxedROM(c))
+    roms(m) = c
+    m
+  }
+  def lookup(m: BlackBoxedROM): ROMConfig = {
+    finalized = true
+    roms(m)
+  }
+}