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ruby: fix MOESI_hammer directory to work with > 3GB memory

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The MOESI_hammer directory assumes a contiguous address space, but X86
has an IO gap from 3-4GB. This patch allows the directory to work with
more than 3GB of memory on X86.

Assumptions: the physical address space (range of possible physical
addresses) is 0-XGB when X <= 3GB, and 0-(X+1)GB when X > 3GB. If there
is no IO gap this patch should still work.

Change-Id: I5453a09e953643cada2c096a91d339a3676f55ee
Reviewed-on: https://gem5-review.googlesource.com/2169
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
This commit is contained in:
Lena Olson 2017-02-05 17:20:34 -06:00 committed by Jason Lowe-Power
parent 620bf51ae7
commit b2669a7875
2 changed files with 13 additions and 1 deletions
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11
src/mem/ruby/structures/DirectoryMemory.cc
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* Copyright (c) 2017 Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -24,6 +25,8 @@
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Lena Olson
*/
#include "mem/ruby/structures/DirectoryMemory.hh"
@ -33,6 +36,7 @@
#include "debug/RubyStats.hh"
#include "mem/ruby/slicc_interface/RubySlicc_Util.hh"
#include "mem/ruby/system/RubySystem.hh"
#include "sim/system.hh"
using namespace std;
@ -44,7 +48,14 @@ DirectoryMemory::DirectoryMemory(const Params *p)
: SimObject(p)
{
m_version = p->version;
// In X86, there is an IO gap in the 3-4GB range.
if (p->system->getArch() == Arch::X86ISA && p->size > 0xc0000000){
// We need to add 1GB to the size for the gap
m_size_bytes = p->size + 0x40000000;
}
else {
m_size_bytes = p->size;
}
m_size_bits = floorLog2(m_size_bytes);
m_num_entries = 0;
m_numa_high_bit = p->numa_high_bit;

1
src/mem/ruby/structures/DirectoryMemory.py
View file

@ -40,3 +40,4 @@ class RubyDirectoryMemory(SimObject):
# the default value of the numa high bit is specified in the command line
# option and must be passed into the directory memory sim object
numa_high_bit = Param.Int("numa high bit")
system = Param.System(Parent.any, "system object")