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/dev/Pci.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/dev/Pci.py') diff --git a/src/dev/Pci.py b/src/dev/Pci.py index 95cb3916f..c866f9386 100644 --- a/src/dev/Pci.py +++ b/src/dev/Pci.py @@ -43,7 +43,7 @@ class PciDevice(DmaDevice): type = 'PciDevice' abstract = True platform = Param.Platform(Parent.any, "Platform this device is part of.") - config = Port("PCI configuration space port") + config = SlavePort("PCI configuration space port") pci_bus = Param.Int("PCI bus") pci_dev = Param.Int("PCI device number") pci_func = Param.Int("PCI function code") -- cgit v1.2.3