From 5a9a743cfc4517f93e5c94533efa767b92272c59 Mon Sep 17 00:00:00 2001 From: Andreas Hansson Date: Mon, 13 Feb 2012 06:43:09 -0500 Subject: MEM: Introduce the master/slave port roles in the Python classes This patch classifies all ports in Python as either Master or Slave and enforces a binding of master to slave. Conceptually, a master (such as a CPU or DMA port) issues requests, and receives responses, and conversely, a slave (such as a memory or a PIO device) receives requests and sends back responses. Currently there is no differentiation between coherent and non-coherent masters and slaves. The classification as master/slave also involves splitting the dual role port of the bus into a master and slave port and updating all the system assembly scripts to use the appropriate port. Similarly, the interrupt devices have to have their int_port split into a master and slave port. The intdev and its children have minimal changes to facilitate the extra port. Note that this patch does not enforce any port typing in the C++ world, it merely ensures that the Python objects have a notion of the port roles and are connected in an appropriate manner. This check is carried when two ports are connected, e.g. bus.master = memory.port. The following patches will make use of the classifications and specialise the C++ ports into masters and slaves. --- src/cpu/simple/AtomicSimpleCPU.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/cpu/simple') diff --git a/src/cpu/simple/AtomicSimpleCPU.py b/src/cpu/simple/AtomicSimpleCPU.py index 93cd02ba7..1199f35e1 100644 --- a/src/cpu/simple/AtomicSimpleCPU.py +++ b/src/cpu/simple/AtomicSimpleCPU.py @@ -34,4 +34,4 @@ class AtomicSimpleCPU(BaseSimpleCPU): width = Param.Int(1, "CPU width") simulate_data_stalls = Param.Bool(False, "Simulate dcache stall cycles") simulate_inst_stalls = Param.Bool(False, "Simulate icache stall cycles") - physmem_port = Port("Physical Memory Port") + physmem_port = MasterPort("Physical Memory Port") -- cgit v1.2.3