CPU: Round-two unifying instr/data CPU ports across models

This patch continues the unification of how the different CPU models
create and share their instruction and data ports. Most importantly,
it forces every CPU to have an instruction and a data port, and gives
these ports explicit getters in the BaseCPU (getDataPort and
getInstPort). The patch helps in simplifying the code, make
assumptions more explicit, andfurther ease future patches related to
the CPU ports.

The biggest changes are in the in-order model (that was not modified
in the previous unification patch), which now moves the ports from the
CacheUnit to the CPU. It also distinguishes the instruction fetch and
load-store unit from the rest of the resources, and avoids the use of
indices and casting in favour of keeping track of these two units
explicitly (since they are always there anyways). The atomic, timing
and O3 model simply return references to their already existing ports.

1 files changed, 0 insertions, 6 deletions

diff --git a/src/cpu/inorder/resource.hh b/src/cpu/inorder/resource.hh
index 972925d94..8822a3620 100644
--- a/src/cpu/inorder/resource.hh
+++ b/src/cpu/inorder/resource.hh
@@ -70,12 +70,6 @@ class Resource {
     /** Return name of this resource */
     virtual std::string name();
 
-    /** Define this function if resource, has a port to connect to an outside
-     *  simulation object.
-     */
-    virtual Port* getPort(const std::string &if_name, int idx) 
-    { return NULL; }
-
     /** Return ID for this resource */
     int getId() { return id; }