tests: Add CPU switching tests

This changeset adds a set of tests that stress the CPU switching
code. It adds the following test configurations:

 * tsunami-switcheroo-full -- Alpha system (atomic, timing, O3)
 * realview-switcheroo-atomic -- ARM system (atomic<->atomic)
 * realview-switcheroo-timing -- ARM system (timing<->timing)
 * realview-switcheroo-o3 -- ARM system (O3<->O3)
 * realview-switcheroo-full -- ARM system (atomic, timing, O3)

Reference data is provided for the 10.linux-boot test case. All of the
tests trigger a CPU switch once per millisecond during the boot
process.

The in-order CPU model was not included in any of the tests as it does
not support CPU handover.

1 files changed, 20 insertions, 4 deletions

diff --git a/tests/configs/base_config.py b/tests/configs/base_config.py
index 945bcb495..370b76c46 100644
--- a/tests/configs/base_config.py
+++ b/tests/configs/base_config.py
@@ -121,10 +121,13 @@ class BaseSystem(object):
 
         sha_bus = self.create_caches_shared(system)
         for cpu in system.cpu:
-            self.create_caches_private(cpu)
-            self.init_cpu(system, cpu)
-            cpu.connectAllPorts(sha_bus if sha_bus != None else system.membus,
-                                system.membus)
+            if not cpu.switched_out:
+                self.create_caches_private(cpu)
+                self.init_cpu(system, cpu)
+                cpu.connectAllPorts(sha_bus if sha_bus != None else system.membus,
+                                    system.membus)
+            else:
+                self.init_cpu(system, cpu)
 
     @abstractmethod
     def create_system(self):
@@ -173,3 +176,16 @@ class BaseFSSystemUniprocessor(BaseFSSystem):
 
     def create_caches_shared(self, system):
         return None
+
+class BaseFSSwitcheroo(BaseFSSystem):
+    """Uniprocessor system prepared for CPU switching"""
+
+    def __init__(self, cpu_classes, **kwargs):
+        BaseFSSystem.__init__(self, **kwargs)
+        self.cpu_classes = tuple(cpu_classes)
+
+    def create_cpus(self):
+        cpus = [ cclass(cpu_id=0, clock='2GHz', switched_out=True)
+                 for cclass in self.cpu_classes ]
+        cpus[0].switched_out = False
+        return cpus