Source code for spinnman.processes.load_routes_process
# Copyright (c) 2017-2019 The University of Manchester
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import struct
from spinn_machine import Router
from spinnman.exceptions import SpinnmanInvalidParameterException
from spinnman.messages.scp.impl import RouterInit, RouterAlloc
from .abstract_multi_connection_process import AbstractMultiConnectionProcess
from .write_memory_process import WriteMemoryProcess
_ROUTE_PATTERN = struct.Struct("<H2xIII")
_END_PATTERN = struct.Struct("<IIII")
[docs]class LoadMultiCastRoutesProcess(AbstractMultiConnectionProcess):
""" A process for loading the multicast routing table on a SpiNNaker\
chip.
"""
__slots__ = [
"_base_address"]
def __init__(self, connection_selector):
super(LoadMultiCastRoutesProcess, self).__init__(connection_selector)
self._base_address = None
[docs] def handle_router_alloc_response(self, response):
self._base_address = response.base_address
[docs] def load_routes(self, x, y, routes, app_id):
# Create the routing data - 16 bytes per entry plus one for the end
# entry
routing_data = bytearray(16 * (len(routes) + 1))
n_entries = 0
for route in routes:
route_entry = \
Router.convert_routing_table_entry_to_spinnaker_route(route)
_ROUTE_PATTERN.pack_into(
routing_data, n_entries * 16, n_entries,
route_entry, route.routing_entry_key, route.mask)
n_entries += 1
# Add an entry to mark the end
_END_PATTERN.pack_into(
routing_data, n_entries * 16,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF)
# Upload the data
table_address = 0x67800000
process = WriteMemoryProcess(self._next_connection_selector)
process.write_memory_from_bytearray(
x, y, 0, table_address, routing_data, 0, len(routing_data))
# Allocate space in the router table
self._send_request(RouterAlloc(x, y, app_id, n_entries),
self.handle_router_alloc_response)
self._finish()
self.check_for_error()
if self._base_address == 0:
raise SpinnmanInvalidParameterException(
"Allocation base address", str(self._base_address),
"Not enough space to allocate the entries")
# Load the entries
self._send_request(
RouterInit(
x, y, n_entries, table_address, self._base_address, app_id))
self._finish()
self.check_for_error()