mem: Add Request factory method for memory management command

This should be used to construct memory management Requests
(Not requiring an address nor a size)

Change-Id: Id1b6f1032c1390210a216cd77c7dd0cec14e962f
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58357
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/request.hh

@@ -522,6 +522,22 @@ class Request
 
     ~Request() {}
 
+    /**
+     * Factory method for creating memory management requests, with
+     * unspecified addr and size.
+     */
+    static RequestPtr
+    createMemManagement(Flags flags, RequestorID id)
+    {
+        auto mgmt_req = std::make_shared<Request>();
+        mgmt_req->_flags.set(flags);
+        mgmt_req->_requestorId = id;
+        mgmt_req->_time = curTick();
+
+        assert(mgmt_req->isMemMgmt());
+        return mgmt_req;
+    }
+
     /**
      * Set up Context numbers.
      */