ruby: convert to M5 MemorySize

Converted both ruby caches and directory memory to use the M5 MemorySize python
type.

src/mem/ruby/system/Cache.py

@@ -5,7 +5,7 @@ from Controller import RubyController
 class RubyCache(SimObject):
     type = 'RubyCache'
     cxx_class = 'CacheMemory'
-    size = Param.Int("");
+    size = Param.MemorySize("capacity in bytes");
     latency = Param.Int("");
     assoc = Param.Int("");
     replacement_policy = Param.String("PSEUDO_LRU", "");

src/mem/ruby/system/DirectoryMemory.cc

@@ -49,7 +49,7 @@ DirectoryMemory::DirectoryMemory(const Params *p)
     : SimObject(p)
 {
     m_version = p->version;
-    m_size_bytes = p->size_mb * static_cast<uint64>(1<<20);
+    m_size_bytes = p->size;
     m_size_bits = log_int(m_size_bytes);
 }
 

src/mem/ruby/system/DirectoryMemory.py

@@ -6,4 +6,4 @@ class RubyDirectoryMemory(SimObject):
     type = 'RubyDirectoryMemory'
     cxx_class = 'DirectoryMemory'
     version = Param.Int(0, "")
-    size_mb = Param.Int(1024, "")
+    size = Param.MemorySize("1GB", "capacity in bytes")

src/mem/ruby/system/RubySystem.py

@@ -9,7 +9,7 @@ class RubySystem(SimObject):
     clock = Param.Clock('1GHz', "")
     block_size_bytes = Param.Int(64,
         "default cache block size; must be a power of two");
-    mem_size_mb = Param.Int("");
+    mem_size = Param.MemorySize("total memory size of the system");
     network = Param.RubyNetwork("")
     debug = Param.RubyDebug("the default debug object")
     profiler = Param.RubyProfiler("");

src/mem/ruby/system/System.cc

@@ -98,7 +98,7 @@ RubySystem::RubySystem(const Params *p)
     assert(is_power_of_2(m_block_size_bytes));
     m_block_size_bits = log_int(m_block_size_bytes);
 
-    m_memory_size_bytes = (uint64_t)p->mem_size_mb * 1024 * 1024;
+    m_memory_size_bytes = p->mem_size;
     m_memory_size_bits = log_int(m_memory_size_bytes);
 
     m_network_ptr = p->network;