Port: Make getAddrRanges const

This patch makes getAddrRanges const throughout the code base. There
is no reason why it should not be, and making it const prevents adding
any unintentional side-effects.

src/dev/x86/i8042.cc

@@ -44,9 +44,10 @@ const uint8_t CommandNack = 0xfe;
 const uint8_t BatSuccessful = 0xaa;
 
 AddrRangeList
-X86ISA::I8042::getAddrRanges()
+X86ISA::I8042::getAddrRanges() const
 {
     AddrRangeList ranges;
+    // TODO: Are these really supposed to be a single byte and not 4?
     ranges.push_back(RangeSize(dataPort, 1));
     ranges.push_back(RangeSize(commandPort, 1));
     return ranges;

src/dev/x86/i8042.hh

@@ -255,7 +255,7 @@ class I8042 : public BasicPioDevice
         commandByte.keyboardFullInt = 1;
     }
 
-    AddrRangeList getAddrRanges();
+    AddrRangeList getAddrRanges() const;
 
     Tick read(PacketPtr pkt);
 

src/dev/x86/i82094aa.hh

@@ -101,7 +101,7 @@ class I82094AA : public PioDevice, public IntDev
     Tick read(PacketPtr pkt);
     Tick write(PacketPtr pkt);
 
-    AddrRangeList getAddrRanges()
+    AddrRangeList getAddrRanges() const
     {
         AddrRangeList ranges;
         ranges.push_back(RangeEx(pioAddr, pioAddr + 4));
@@ -109,7 +109,7 @@ class I82094AA : public PioDevice, public IntDev
         return ranges;
     }
 
-    AddrRangeList getIntAddrRange()
+    AddrRangeList getIntAddrRange() const
     {
         AddrRangeList ranges;
         ranges.push_back(RangeEx(x86InterruptAddress(initialApicId, 0),

src/dev/x86/intdev.hh

@@ -74,7 +74,7 @@ class IntDev
         {
         }
 
-        AddrRangeList getAddrRanges()
+        AddrRangeList getAddrRanges() const
         {
             return device->getIntAddrRange();
         }
@@ -152,7 +152,7 @@ class IntDev
     }
 
     virtual AddrRangeList
-    getIntAddrRange()
+    getIntAddrRange() const
     {
         panic("intAddrRange not implemented.\n");
     }