ruby: correct computation of number of bits required for address

The number of bits required for an address was set to floorLog2(memory size).
This is correct under the assumption that the memory size is a power of 2,
which is not always true. Hence, floorLog2 is being replaced with ceilLog2.

diff --git a/src/mem/ruby/system/System.cc b/src/mem/ruby/system/System.cc
index 6a0721217ac8b31134707bb163a175fb66763fbf..01e50ef0b5bc3246dc9b479c7de5ece17de832e1 100644 (file)
--- a/src/mem/ruby/system/System.cc
+++ b/src/mem/ruby/system/System.cc
@@ -69,7 +69,7 @@ RubySystem::RubySystem(const Params *p)
     if (m_memory_size_bytes == 0) {
         m_memory_size_bits = 0;
     } else {
-        m_memory_size_bits = floorLog2(m_memory_size_bytes);
+        m_memory_size_bits = ceilLog2(m_memory_size_bytes);
     }
 
     g_system_ptr = this;