gem5/ext
Andreas Hansson bf2f178f85 mem: Add a wrapped DRAMSim2 memory controller
This patch adds DRAMSim2 as a memory controller by wrapping the
external library and creating a sublass of AbstractMemory that bridges
between the semantics of gem5 and the DRAMSim2 interface.

The DRAMSim2 wrapper extracts the clock period from the config
file. There is no way of extracting this information from DRAMSim2
itself, so we simply read the same config file and get it from there.

To properly model the response queue, the wrapper keeps track of how
many transactions are in the actual controller, and how many are
stacking up waiting to be sent back as responses (in the wrapper). The
latter requires us to move away from the queued port and manage the
packets ourselves. This is due to DRAMSim2 not having any flow control
on the response path.

DRAMSim2 assumes that the transactions it is given are matching the
burst size of the choosen memory. The wrapper checks to ensure the
cache line size of the system matches the burst size of DRAMSim2 as
there are currently no provisions to split the system requests. In
theory we could allow a cache line size smaller than the burst size,
but that would lead to inefficient use of the DRAM, so for not we
fatal also in this case.
2014-02-18 05:50:53 -05:00
..
dnet includes: add ext to the includes path. 2009-03-17 12:49:03 -07:00
dramsim2 mem: Add a wrapped DRAMSim2 memory controller 2014-02-18 05:50:53 -05:00
fputils ext: Fix fputils compiler flags to ensure ISO C99 2013-10-02 06:08:43 -04:00
gzstream scons: Make shared library builds work again 2009-06-12 21:19:16 -07:00
libelf arm: Add support for ARMv8 (AArch64 & AArch32) 2014-01-24 15:29:34 -06:00
libfdt ext lib: add libfdt to enable flattened device tree support 2013-02-15 18:48:59 -05:00
ply ply: update PLY to version 3.2 2009-08-16 13:39:58 -07:00
x11keysym Ext: Add X11 keysym header files to ext directory. 2011-02-09 22:27:37 -06:00