X86: Create a handy way to access labels from the ROM in microcode.

src/arch/x86/isa/microasm.isa

@@ -183,6 +183,11 @@ let {{
 
     assembler.symbols["label"] = labeler
 
+    def rom_labeler(labelStr):
+        return "romMicroPC(RomLabels::extern_label_%s)" % labelStr
+
+    assembler.symbols["rom_label"] = rom_labeler
+
     def stack_index(index):
         return "(NUM_FLOATREGS + (((%s) + 8) %% 8))" % index
 

src/arch/x86/isa/microops/base.isa

@@ -88,6 +88,7 @@ let {{
                 // env may not be used in the microop's constructor.
                 RegIndex reg = env.reg;
                 reg = reg;
+                using namespace RomLabels;
                 return %s;
             }
         '''

src/arch/x86/isa/rom.isa

@@ -55,9 +55,6 @@ let {{
 
         def getDeclaration(self):
             declareLabels = "namespace RomLabels {\n"
-            for (label, microop) in self.labels.items():
-                declareLabels += "const static uint64_t label_%s = %d;\n" \
-                                  % (label, microop.micropc)
             for (label, microop) in self.externs.items():
                 declareLabels += \
                     "const static MicroPC extern_label_%s = %d;\n" \