Source code for spinnman.messages.scp.impl.router_alloc
# Copyright (c) 2014 The University of Manchester
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import struct
from typing import Optional
from spinn_utilities.overrides import overrides
from spinnman.messages.scp import SCPRequestHeader
from spinnman.messages.scp.abstract_messages import (
AbstractSCPRequest, AbstractSCPResponse)
from spinnman.messages.scp.enums import (
AllocFree, SCPCommand, SCPResult)
from spinnman.messages.sdp import SDPFlag, SDPHeader
from spinnman.exceptions import SpinnmanUnexpectedResponseCodeException
_ONE_WORD = struct.Struct("<I")
class RouterAllocResponse(AbstractSCPResponse):
"""
An SCP response to a request to allocate router entries.
"""
__slots__ = "_base_address",
def __init__(self) -> None:
super().__init__()
self._base_address: Optional[int] = None
@overrides(AbstractSCPResponse.read_data_bytestring)
def read_data_bytestring(self, data: bytes, offset: int):
result = self.scp_response_header.result
if result != SCPResult.RC_OK:
raise SpinnmanUnexpectedResponseCodeException(
"Router Allocation", "CMD_ALLOC", result.name)
self._base_address = _ONE_WORD.unpack_from(data, offset)[0]
@property
def base_address(self) -> int:
"""
The base address allocated, or 0 if none.
:rtype: int
"""
return self._base_address or 0
class RouterAlloc(AbstractSCPRequest[RouterAllocResponse]):
"""
An SCP Request to allocate space for routing entries.
"""
__slots__ = ()
def __init__(self, x: int, y: int, app_id: int, n_entries: int):
"""
:param int x:
The x-coordinate of the chip to allocate on, between 0 and 255
:param int y:
The y-coordinate of the chip to allocate on, between 0 and 255
:param int app_id: The ID of the application, between 0 and 255
:param int n_entries: The number of entries to allocate
"""
# pylint: disable=unsupported-binary-operation
super().__init__(
SDPHeader(
flags=SDPFlag.REPLY_EXPECTED, destination_port=0,
destination_cpu=0, destination_chip_x=x,
destination_chip_y=y),
SCPRequestHeader(command=SCPCommand.CMD_ALLOC),
argument_1=(
(app_id << 8) |
AllocFree.ALLOC_ROUTING.value),
argument_2=n_entries)
[docs]
@overrides(AbstractSCPRequest.get_scp_response)
def get_scp_response(self) -> RouterAllocResponse:
return RouterAllocResponse()