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Andreas Sandberg f9bcf46371 cpu: Make sure that a drained timing CPU isn't executing ucode Currently, the timing CPU can be in the middle of a microcode sequence or multicycle (stayAtPC is true) instruction when it is drained. This leads to two problems: * When switching to a hardware virtualized CPU, we obviously can't execute gem5 microcode. * If stayAtPC is true we might execute half of an instruction twice when restoring a checkpoint or switching CPUs, which leads to an incorrect execution. After applying this patch, the CPU will be on a proper instruction boundary, which means that it is safe to switch to any CPU model (including hardware virtualized ones). This changeset also fixes a bug where the timing CPU sometimes switches out with while stayAtPC is true, which corrupts the target state after a CPU switch or checkpoint. Note: This changeset removes the so_state variable from checkpoints since the drain state isn't used anymore.		2013-01-07 13:05:46 -05:00
build_opts	Regression: Add a test for x86 timing full system ruby simulation	2012-04-25 22:43:36 -05:00
configs	cpu: Rename defer_registration->switched_out	2013-01-07 13:05:45 -05:00
ext	scons: Enforce gcc >= 4.4 or clang >= 2.9 and c++0x support	2013-01-07 13:05:39 -05:00
src	cpu: Make sure that a drained timing CPU isn't executing ucode	2013-01-07 13:05:46 -05:00
system	ARM: Fix issue with with way MPIDR is read to include affinity levels.	2012-09-07 14:20:53 -05:00
tests	tests: Update the ignore regexps to reflect the M5->gem5 name change	2013-01-07 13:05:45 -05:00
util	arm: Remove the register mapping hack used when copying TCs	2013-01-07 13:05:44 -05:00
.hgignore	.hgignore: added src/doxygen	2010-07-27 20:00:38 -07:00
.hgtags	Added tag stable_2012_06_28 for changeset f75ee4849c40	2012-07-19 16:53:02 -07:00
COPYING	copyright: Add code for finding all copyright blocks and create a COPYING file	2011-06-02 17:36:07 -07:00
LICENSE	copyright: Add code for finding all copyright blocks and create a COPYING file	2011-06-02 17:36:07 -07:00
README	gem5: Update the README file to be a bit less out-of-date.	2012-09-25 11:49:40 -05:00
SConstruct	scons: Enforce gcc >= 4.4 or clang >= 2.9 and c++0x support	2013-01-07 13:05:39 -05:00

README

This is the gem5 simulator.

For detailed information about building the simulator and getting
started please refer to:
* The main website:     http://www.gem5.org
* Documentation wiki:   http://www.gem5.org/Documentation 
* Doxygen generated:    http://www.gem5.org/docs
* Tutorials:            http://www.gem5.org/Tutorials


Specific pages of interest are:
http://www.gem5.org/Introduction
http://www.gem5.org/Build_System
http://www.gem5.org/Dependencies
http://www.gem5.org/Running_gem5

Short version:
External tools and required versions

To build gem5, you will need the following software:
g++ version 4.3 or newer.
Python, version 2.4 - 2.7 (we don't support Python 3.X). gem5 links in the 
    Python interpreter, so you need the Python header files and shared 
    library (e.g., /usr/lib/libpython2.4.so) in addition to the interpreter
    executable. These may or may not be installed by default. For example,
    on Debian/Ubuntu, you need the "python-dev" package in addition to the
    "python" package. If you need a newer or different Python installation
     but can't or don't want to upgrade the default Python on your system,
     see http://www.gem5.org/Using_a_non-default_Python_installation
SCons, version 0.98.1 or newer. SCons is a powerful replacement for make. 
    If you don't have administrator privileges on your machine, you can use the
    "scons-local" package to install scons in your m5 directory, or install SCons
    in your home directory using the '--prefix=' option.  
SWIG, version 1.3.34 or newer
zlib, any recent version. For Debian/Ubuntu, you will need the "zlib-dev" or
    "zlib1g-dev" package to get the zlib.h header file as well as the library
    itself.
m4, the macro processor.


4. In this directory, type 'scons build/<ARCH>/gem5.opt' where ARCH is one
of ALPHA, ARM, MIPS, POWER, SPARC, or X86. This will build an optimized version
of the gem5 binary (gem5.opt) for the the specified architecture.

If you have questions, please send mail to gem5-users@gem5.org

WHAT'S INCLUDED (AND NOT)
-------------------------

The basic source release includes these subdirectories:
 - gem5:
   - configs: example simulation configuration scripts
   - ext: less-common external packages needed to build gem5
   - src: source code of the gem5 simulator
   - system: source for some optional system software for simulated systems
   - tests: regression tests
   - util: useful utility programs and files

To run full-system simulations, you will need compiled system firmware
(console and PALcode for Alpha), kernel binaries and one or more disk images. 
Please see the gem5 download page for these items at http://www.gem5.org/Download