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author | Andreas Hansson <andreas.hansson@arm.com> | 2012-02-13 06:43:09 -0500 |
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committer | Andreas Hansson <andreas.hansson@arm.com> | 2012-02-13 06:43:09 -0500 |
commit | 5a9a743cfc4517f93e5c94533efa767b92272c59 (patch) | |
tree | f3dbc078a51e5759b26b1a5f16263ddb1cf55a7b /src/dev/Device.py | |
parent | 8cb4a2208d568eb86ad3f6c6bb250bcbe2952302 (diff) | |
download | gem5-5a9a743cfc4517f93e5c94533efa767b92272c59.tar.xz |
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.
Diffstat (limited to 'src/dev/Device.py')
-rw-r--r-- | src/dev/Device.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/dev/Device.py b/src/dev/Device.py index c32946277..96c95ebc9 100644 --- a/src/dev/Device.py +++ b/src/dev/Device.py @@ -33,7 +33,7 @@ from MemObject import MemObject class PioDevice(MemObject): type = 'PioDevice' abstract = True - pio = Port("Programmed I/O port") + pio = SlavePort("Programmed I/O port") system = Param.System(Parent.any, "System this device is part of") class BasicPioDevice(PioDevice): @@ -45,7 +45,7 @@ class BasicPioDevice(PioDevice): class DmaDevice(PioDevice): type = 'DmaDevice' abstract = True - dma = Port("DMA port") + dma = MasterPort("DMA port") min_backoff_delay = Param.Latency('4ns', "min time between a nack packet being received and the next request made by the device") max_backoff_delay = Param.Latency('10us', |