MEM: Separate queries for snooping and address ranges

This patch simplifies the address-range determination mechanism and
also unifies the naming across ports and devices. It further splits
the queries for determining if a port is snooping and what address
ranges it responds to (aiming towards a separation of
cache-maintenance ports and pure memory-mapped ports). Default
behaviours are such that most ports do not have to define isSnooping,
and master ports need not implement getAddrRanges.

src/dev/arm/gic.cc

@@ -703,12 +703,13 @@ Gic::postInt(uint32_t cpu, Tick when)
         eventq->schedule(postIntEvent[cpu], when);
 }
 
-void
-Gic::addressRanges(AddrRangeList &range_list)
+AddrRangeList
+Gic::getAddrRanges()
 {
-    range_list.clear();
-    range_list.push_back(RangeSize(distAddr, DIST_SIZE));
-    range_list.push_back(RangeSize(cpuAddr, CPU_SIZE));
+    AddrRangeList ranges;
+    ranges.push_back(RangeSize(distAddr, DIST_SIZE));
+    ranges.push_back(RangeSize(cpuAddr, CPU_SIZE));
+    return ranges;
 }
 
 

src/dev/arm/gic.hh

@@ -259,7 +259,7 @@ class Gic : public PioDevice
     /** Return the address ranges used by the Gic
      * This is the distributor address + all cpu addresses
      */
-    virtual void addressRanges(AddrRangeList &range_list);
+    virtual AddrRangeList getAddrRanges();
 
     /** A PIO read to the device, immediately split up into
      * readDistributor() or readCpu()

src/dev/arm/pl111.cc

@@ -735,11 +735,12 @@ Pl111::generateInterrupt()
     }
 }
 
-void
-Pl111::addressRanges(AddrRangeList& range_list)
+AddrRangeList
+Pl111::getAddrRanges()
 {
-    range_list.clear();
-    range_list.push_back(RangeSize(pioAddr, pioSize));
+    AddrRangeList ranges;
+    ranges.push_back(RangeSize(pioAddr, pioSize));
+    return ranges;
 }
 
 Pl111 *

src/dev/arm/pl111.hh

@@ -325,10 +325,12 @@ class Pl111: public AmbaDmaDevice
     virtual void serialize(std::ostream &os);
     virtual void unserialize(Checkpoint *cp, const std::string &section);
 
-    /** return the address ranges that this device responds to.
-     * @param range_list range list to populate with ranges
+    /**
+     * Determine the address ranges that this device responds to.
+     *
+     * @return a list of non-overlapping address ranges
      */
-    void addressRanges(AddrRangeList &range_list);
+    AddrRangeList getAddrRanges();
 };
 
 #endif