arch: Make the ISA class inherit from SimObject

The ISA class on stores the contents of ID registers on many
architectures. In order to make reset values of such registers
configurable, we make the class inherit from SimObject, which allows
us to use the normal generated parameter headers.

This patch introduces a Python helper method, BaseCPU.createThreads(),
which creates a set of ISAs for each of the threads in an SMT
system. Although it is currently only needed when creating
multi-threaded CPUs, it should always be called before instantiating
the system as this is an obvious place to configure ID registers
identifying a thread/CPU.

3 files changed, 5 insertions, 0 deletions

diff --git a/configs/example/fs.py b/configs/example/fs.py
index f1b8acedf..9b8ae1d29 100644
--- a/configs/example/fs.py
+++ b/configs/example/fs.py
@@ -139,6 +139,7 @@ for i in xrange(np):
         test_sys.cpu[i].fastmem = True
     if options.checker:
         test_sys.cpu[i].addCheckerCpu()
+    test_sys.cpu[i].createThreads()
 
 CacheConfig.config_cache(options, test_sys)
 
@@ -155,6 +156,7 @@ if len(bm) == 2:
         drive_sys = makeArmSystem(drive_mem_mode, options.machine_type, bm[1])
 
     drive_sys.cpu = DriveCPUClass(cpu_id=0)
+    drive_sys.cpu.createThreads()
     drive_sys.cpu.createInterruptController()
     drive_sys.cpu.connectAllPorts(drive_sys.membus)
     if options.fastmem:
diff --git a/configs/example/ruby_fs.py b/configs/example/ruby_fs.py
index 97863a46b..8d21cfb32 100644
--- a/configs/example/ruby_fs.py
+++ b/configs/example/ruby_fs.py
@@ -103,6 +103,7 @@ for (i, cpu) in enumerate(system.cpu):
     #
     # Tie the cpu ports to the correct ruby system ports
     #
+    cpu.createThreads()
     cpu.createInterruptController()
     cpu.icache_port = system.ruby._cpu_ruby_ports[i].slave
     cpu.dcache_port = system.ruby._cpu_ruby_ports[i].slave
diff --git a/configs/example/se.py b/configs/example/se.py
index c4c6daedf..fe5524ef5 100644
--- a/configs/example/se.py
+++ b/configs/example/se.py
@@ -180,6 +180,8 @@ for i in xrange(np):
     if options.checker:
         system.cpu[i].addCheckerCpu()
 
+    system.cpu[i].createThreads()
+
 if options.ruby:
     if not (options.cpu_type == "detailed" or options.cpu_type == "timing"):
         print >> sys.stderr, "Ruby requires TimingSimpleCPU or O3CPU!!"