112 lines
3.5 KiB
Plaintext
112 lines
3.5 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: NicDeviceContract.sg
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//
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namespace Microsoft.Singularity.Io.Net
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{
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using System;
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using System.Runtime.InteropServices;
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using Microsoft.Contracts;
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using Microsoft.SingSharp;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Channels;
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using Microsoft.Singularity.Io;
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public contract NicDeviceContract : DeviceContract
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{
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// START messages
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out message Success();
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// READY messages
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in message GetDeviceProperties(NicDeviceProperties*! in ExHeap props);
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out message DeviceProperties(NicDeviceProperties*! in ExHeap props);
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in message ConfigureIO();
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out message AckConfigureIO();
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// IO_CONFIGURE_X messages
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//
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// Return success or specific error
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in message RegisterForEvents(NicDeviceEventContract.Exp:READY! ep);
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in message SetChecksumProperties(ChecksumSupport properties);
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out message UnsupportedChecksumProperties();
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in message StartIO();
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out message AckStartIO();
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// IO_RUNNING messages
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in message GiveTxPacketsToDevice(PacketFifo*! in ExHeap packetFifo);
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out message TakeTxPacketsFromDevice(PacketFifo*! in ExHeap packetFifo);
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in message GiveRxPacketsToDevice(PacketFifo*! in ExHeap packetFifo);
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out message TakeRxPacketsFromDevice(PacketFifo*! in ExHeap packetFifo);
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in message StopIO();
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out message AckStopIO();
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override state Start: one
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{
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Success! -> READY;
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}
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state READY: one
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{
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GetDeviceProperties? -> DeviceProperties! ->
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ConfigureIO? -> AckConfigureIO! ->
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IO_CONFIGURE_BEGIN;
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}
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//
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// Configuration states
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//
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// We're expecting a sequence of configuration messages.
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// If a configuration step fails the configuration
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// process must be restarted. This makes the
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// implementation very clean for the sending and
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// receiving parties. Programs should not be be
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// failing at any stage as they've completed the READY
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// queries and have all of the pertinent information on hand.
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//
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state IO_CONFIGURE_BEGIN: one
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{
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RegisterForEvents? -> IO_CONFIGURE_0;
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}
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state IO_CONFIGURE_0: one
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{
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Success! -> IO_CONFIGURE_1;
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}
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state IO_CONFIGURE_1: one
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{
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SetChecksumProperties? -> IO_CONFIGURE_2;
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ConfigureIO? -> IO_CONFIGURE_BEGIN;
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}
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state IO_CONFIGURE_2: one
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{
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UnsupportedChecksumProperties! -> IO_CONFIGURE_BEGIN;
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Success! -> IO_CONFIGURED;
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}
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state IO_CONFIGURED: one
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{
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ConfigureIO? -> IO_CONFIGURE_BEGIN;
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StartIO? -> AckStartIO! -> IO_RUNNING;
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}
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//
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// Running state
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//
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state IO_RUNNING: one
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{
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GiveTxPacketsToDevice? -> TakeTxPacketsFromDevice! -> IO_RUNNING;
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GiveRxPacketsToDevice? -> TakeRxPacketsFromDevice! -> IO_RUNNING;
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StopIO? -> AckStopIO! -> IO_CONFIGURED;
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}
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}
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}
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