From: Nilay Vaish <nilay@cs.wisc.edu>
Date: Thu, 31 Jan 2013 15:44:20 +0000 (-0600)
Subject: ruby: correct computation of number of bits required for address
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6aed4d4f931f0eca15d1211e7e28a06d66f16d32;p=gem5.git

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 6a0721217..01e50ef0b 100644
--- 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;