CN113806106B - Communication system for VxWorks real-time process - Google Patents
Communication system for VxWorks real-time process Download PDFInfo
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- CN113806106B CN113806106B CN202110930722.7A CN202110930722A CN113806106B CN 113806106 B CN113806106 B CN 113806106B CN 202110930722 A CN202110930722 A CN 202110930722A CN 113806106 B CN113806106 B CN 113806106B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/545—Interprogram communication where tasks reside in different layers, e.g. user- and kernel-space
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44505—Configuring for program initiating, e.g. using registry, configuration files
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44521—Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/445—Program loading or initiating
- G06F9/44594—Unloading
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/448—Execution paradigms, e.g. implementations of programming paradigms
- G06F9/4482—Procedural
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5022—Mechanisms to release resources
Abstract
The invention discloses a communication system for a VxWorks real-time process, which comprises a modem hardware abstraction layer, wherein the modem hardware abstraction layer comprises a communication service library and a control service module, the communication service library exists in the form of a VxWorks application shared library, a kernel interface provided by the control service module for waveform application is registered as a system call to an operating system, and the software interface is packaged according to SCA standard, and is used for dynamically calling the waveform application in the form of the real-time process; the control service module is in the form of a VxWorks loadable kernel module, is loaded and resides in a VxWorks operating system, provides various functions of a modem hardware abstraction layer, and provides a related kernel interface for a communication service library to register. The invention can solve the engineering problem of deploying a plurality of applications by a single processor node and improve the integration level of the system.
Description
Technical Field
The invention relates to a modem hardware abstraction layer (Modem Hardware Abstraction Layer, abbreviated as MHAL) based on a software communication architecture (Software Communication Architecture, abbreviated as SCA) in a software radio (Software Defined Radio, abbreviated as SDR) system, in particular to the SCA MHAL facing a VxWorks real-time process.
Background
The SDR has reconfigurable capability through the combination of hardware and software, and can realize different radio frequency functions by changing the software on the premise of not changing the hardware. The method changes the traditional concept, brings profound effects on wireless communication from various aspects such as software, intelligence, generalization, personalization and compatibility, and gradually forms a huge industry equivalent to a computer and a program controlled exchange.
The SCA divides the software/hardware structure by an object-oriented method, establishes an open system standard, provides a software radio development framework irrelevant to specific realization, and ensures portability and reconfigurability of software and hardware and interoperability of equipment.
The SDR platform adopts various devices to form a heterogeneous computing network, and the nodes complete communication through a high-speed bus. MHAL is designed to enable barrier-free data transmission between different processing units, and packages data of a user layer into a unified format through an interconnection bus to send out or parses received data to deliver to a user. In order to realize decoupling of software and hardware, the application needs to be deployed as required, and communication interfaces of all devices need to be packaged through MHAL, so that relevant functions such as consistent communication interfaces, unified control of the application and the like are realized.
For real-time and reliability, vxWorks embedded real-time operating systems are typically employed as the software running environment for the compute nodes. In the prior art, only one waveform application is usually deployed on one processor node, and the waveform application runs on the kernel mode of VxWorks as a kernel program to obtain the highest computation and memory performance.
With the development of hardware technology, processors start to develop towards the directions of multiple cores, high frequencies and multiple interfaces, the performance of a single processor often exceeds the requirement of a single application, a deployment mode that one processor operates one node is still adopted, the utilization rate of system resources is low, and the system integration level is not improved. Thus, deploying multiple applications with a single processor is a prominent need for current SDR systems. As a real-time operating system, a plurality of kernel-mode applications are deployed in VxWorks, and various conflicts and faults are easy to cause because of no isolation among the applications.
VxWorks, starting from version 6.X, introduced real-time process technology (Real time process project, RTP) as a new software running mode. The mode has the advantages that application programs are independent and do not influence each other, and the stability of the kernel is improved. Each application is operated in a user mode, the applications are invisible from each other, the operation of the system is not influenced, and the node reliability under multiple applications is improved. The user mode application cannot directly access the interface of the kernel mode program and can only access the interface through system call, so that the MHAL design facing the real-time process is different from the traditional mode. In view of the fact that no such design exists at present, a modem hardware abstraction layer for VxWorks real-time processes is provided herein to solve the problem of deploying multiple applications with a single processor.
Disclosure of Invention
The invention provides a modulation and demodulation hardware abstraction layer for a VxWorks real-time process, which realizes the function of external communication of waveform application in a real-time process form through MHAL, completes loading and unloading control of the waveform application, solves the engineering problem of deploying a plurality of applications by a single processor node, and improves the integration level of a system.
The invention aims at realizing the following technical scheme.
A modem hardware abstraction layer facing to a VxWorks real-time process comprises a communication service library and a control service module, wherein the communication service library exists in the form of a VxWorks application shared library, a kernel interface provided by the control service module for waveform application is registered as a system call to an operating system and packaged as a software interface according to an SCA standard, and the software interface is used for dynamically calling the waveform application in the form of the real-time process;
the control service module is in the form of a VxWorks loadable kernel module, is loaded and resides in a VxWorks operating system, provides various functions of a modem hardware abstraction layer, and provides a related kernel interface for a communication service library to register.
According to the characteristics, when the control service module is started by the node, the kernel is loaded and operated; after the waveform application is started, the waveform application completes dynamic link to the communication service library through the VxWorks operating system so as to call a software interface of the communication service library.
According to the above features, the kernel interface provided by the control service module includes a communication kernel interface, and the software interface encapsulated by the corresponding communication service library is a communication software interface; after the control service module receives data transmitted by each waveform application transmitted by a communication software interface in the communication service library, judging whether the communication is carried out between two waveform applications of the same node or not by looking up a mapping table, if the communication is not carried out between the two waveform applications of the same node, transmitting the communication from a bus according to specified bus parameters, and if the communication is carried out between the two waveform applications of the same node, carrying out the communication between the waveform applications by a shared memory; when the data transmitted from the bus is received, the waveform application of the received data is found through the lookup mapping table and then transmitted to the corresponding waveform application through the communication software interface in the communication service library.
According to the characteristics, the kernel interface provided by the control service module further comprises a remote call kernel interface, and the software interface packaged by the corresponding communication service library is a remote call software interface;
after the control service module receives the remote call message of the upper node, judging which functions of the waveform application need to be called, and registering related functions for the waveform application through a remote call software interface in the communication service library, or acquiring related call instructions to finish execution of the designated functions.
According to the characteristics, after receiving an application loading instruction sent by the upper node, the control service module calls a corresponding waveform application file from the local storage equipment to load and run the designated waveform application.
According to the above features, after receiving the mapping table update instruction sent by the upper node, the control service module completes the updating of the mapping table, so as to provide the function of controlling the communication between waveform applications of the service module.
According to the above features, after receiving an application start instruction sent by a superior node, the control service module notifies the waveform application to start a start function, and the waveform application invokes a related software interface through the communication service library, and performs external communication or local communication through the control service module.
According to the above feature, after receiving the application stopping instruction sent by the upper node, the control service module notifies the waveform application stopping function, and disconnects the link between the waveform application and the communication service library, so that the waveform application stops external communication.
According to the characteristics, after receiving an application unloading instruction sent by the upper node, the control service module unloads the designated waveform application and releases the resource.
The invention has the beneficial effects that:
1. the modulation and demodulation hardware abstraction layer facing the VxWorks real-time process can be used for nodes to deploy a plurality of waveform applications;
2. the modulation and demodulation hardware abstraction layer facing the VxWorks real-time process can provide a reliable and safe multi-waveform deployment environment, can well improve the integration level of an SDR system, and effectively realizes weight reduction and power consumption reduction;
3. the hardware abstraction layer of the modem facing the VxWorks real-time process has universality, can be suitable for various processors running the VxWorks, and can be expanded to the scenes running other operating systems.
Drawings
FIG. 1 shows the composition and cross-linking relationship of a modem hardware abstraction layer for a VxWorks real-time process.
Fig. 2 is a flow diagram of deploying a waveform application on a node.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The following description is given first:
waveform application: a specific SCA compliant program is run on the SDR platform to implement the desired radio function.
Kernel module: and the software module running in the kernel mode of the VxWorks is loaded into the VxWorks system as a kernel library to run.
Application shared library: the software module running in VxWorks user mode is called by the waveform application as a shared library.
Referring to fig. 1, a modem hardware abstraction layer for a VxWorks real-time process in this embodiment includes a control service module and a communication service library ("control service module" and "communication service library" are just one name that is easy to identify, and in practice, other names may be used).
1. Communication service library
The communication service library exists in the form of a VxWorks application shared library, a kernel interface provided by the control service module for the waveform application is registered to an operating system as a system call, and is packaged into a software interface according to the SCA standard, the software interface is used for dynamically calling the waveform application in the form of a real-time process, and the access requirement of the waveform application to communication resources is transmitted to the control service module. Each waveform application may independently connect, invoke, and communicate with a software interface in the service library. The kernel interface provided by the control service module comprises a communication kernel interface and a remote call kernel interface, and the software interfaces packaged by the corresponding communication service library are a communication software interface and a remote call software interface respectively.
2. Control service module
The control service module is in the form of a VxWorks loadable kernel module, is loaded and resides in a VxWorks operating system, provides various functions of a modem hardware abstraction layer, and provides a related kernel interface for a communication service library to register.
The control service module has the following functions:
1) Communication between wave applications: providing input and output capability of the bus and state judging capability of the bus, and completing an external bus communication function of the computing node; and providing a shared memory, thereby improving the data interaction capability between local applications. The control service module provides a communication kernel interface for the communication service library to register and package as a communication software interface. After receiving data transmitted by each waveform application transmitted by a communication software interface in a communication service library, judging whether the communication is carried out between two waveform applications of the same node through a lookup mapping table, if the communication is not carried out by the same node, transmitting the data from a bus according to specified bus parameters, and if the communication is carried out by the same node, carrying out the communication between the waveform applications through a shared memory; when the data transmitted from the bus is received, the waveform application of the received data is found through the lookup mapping table and then transmitted to the corresponding waveform application through the communication software interface in the communication service library. Wherein the mapping table provides a mapping of logical communication addresses to actual physical addresses.
2) Remote call: the upper node can remotely call the appointed function process of the local waveform application. The control service module provides a remote call kernel interface for the communication service library to register and package into a remote call software interface. After receiving the remote call message of the upper node, the control service module judges which functions of the waveform application need to be called, and registers related functions for the waveform application through a remote call software interface in the communication service library, or acquires related call instructions to complete execution of the designated functions.
3) Instruction processing: the module can analyze the instructions issued by the superior node, including mapping table updating, application loading, application unloading, application starting, application stopping and the like, and control of the superior node on the computing node is realized. After the instruction is executed, the control service module feeds back the execution result to the instruction sender so that the sender can confirm the result and make a decision.
4) Other functions.
When the control service module is started by the node, the kernel is loaded and operated; the "communication service library" completes the connection when loaded by the waveform application.
Referring to fig. 2, the flow of deploying waveform application on a node through the modem hardware abstraction layer facing VxWorks real-time process of the present invention is as follows:
the first step, the node starts up, finish the initialization of the control service module:
1. powering up the node, and starting a VxWorks operating system;
2. the node kernel loads a control service module, and starts related tasks provided by the control service module to reside in the kernel as background tasks, and related kernel interfaces provided by the control service module wait for waveform application to be called through a communication service library.
Second, application starting:
1. after receiving an application loading instruction sent by a superior node, the control service module invokes a corresponding waveform application file from local storage equipment to load and run a designated waveform application;
2. after receiving the mapping table updating instruction sent by the upper node, the control service module completes the updating of the mapping table of the control service module so as to provide the function of communication between waveform applications of the control service module;
3. after the waveform application is started, the waveform application completes dynamic link of the communication service library through the VxWorks operating system so as to call a software interface of the communication service library.
4. After receiving an application starting instruction sent by a superior node, the control service module informs the waveform application to start a starting function, and the waveform application calls a related software interface through a communication service library to perform external communication or local communication through the control service module.
Third, application stops:
1. after receiving an application stopping instruction sent by a superior node, the control service module informs a waveform application stopping function, and disconnects the link between the waveform application and the communication service library so as to stop external communication of the waveform application;
2. and after receiving an application unloading instruction sent by the upper node, the control service module unloads the designated waveform application and releases the resource.
Claims (7)
1. A communication system facing VxWorks real-time process comprises a modem hardware abstraction layer, wherein the modem hardware abstraction layer comprises a communication service library and a control service module, and is characterized in that the communication service library exists in the form of a VxWorks application shared library, a kernel interface provided by the control service module for waveform application is registered as system call to an operating system and packaged as a software interface according to SCA standard, and the software interface is used for dynamically calling the waveform application in the form of real-time process;
the control service module is in the form of a VxWorks loadable kernel module, is loaded and resides in a VxWorks operating system, provides various functions of a modem hardware abstraction layer, and provides a related kernel interface for a communication service library to register;
when the control service module is started by the node, the kernel is loaded and operated; after the waveform application is started, the waveform application completes dynamic link to the communication service library through the VxWorks operating system so as to call a software interface of the communication service library;
the kernel interface provided by the control service module comprises a communication kernel interface, and the software interface packaged by the corresponding communication service library is a communication software interface; after the control service module receives data transmitted by each waveform application transmitted by a communication software interface in the communication service library, judging whether the communication is carried out between two waveform applications of the same node or not by looking up a mapping table, if the communication is not carried out between the two waveform applications of the same node, transmitting the communication from a bus according to specified bus parameters, and if the communication is carried out between the two waveform applications of the same node, carrying out the communication between the waveform applications by a shared memory; when the data transmitted from the bus is received, the waveform application of the received data is found through the lookup mapping table and then transmitted to the corresponding waveform application through the communication software interface in the communication service library.
2. The communication system for the VxWorks real-time process according to claim 1, wherein the kernel interface provided by the control service module further comprises a remote call kernel interface, and the software interface packaged by the corresponding communication service library is a remote call software interface;
after the control service module receives the remote call message of the upper node, judging which functions of the waveform application need to be called, and registering related functions for the waveform application through a remote call software interface in the communication service library, or acquiring related call instructions to finish execution of the designated functions.
3. The communication system for VxWorks real-time process according to claim 1, wherein the control service module invokes the corresponding waveform application file from the local storage device to load and run the designated waveform application after receiving the application loading instruction sent by the upper node.
4. The communication system for VxWorks real-time process according to claim 1, wherein the control service module completes the update of the mapping table after receiving the update command of the mapping table sent by the upper node, so as to provide the function of controlling the communication between waveform applications of the service module.
5. The communication system for VxWorks real-time process according to claim 1, wherein the control service module receives an application start instruction sent by an upper node, and then notifies the waveform application to start a start function, and the waveform application invokes a related software interface through the communication service library, and performs external communication or local communication through the control service module.
6. The communication system for VxWorks real-time process according to claim 1, wherein the control service module notifies the waveform application stopping function after receiving the application stopping instruction sent by the upper node, and disconnects the link between the waveform application and the communication service library, so that the waveform application stops external communication.
7. The communication system for VxWorks real-time process according to claim 1, wherein the control service module unloads the designated waveform application and releases the resource after receiving the application unloading command sent by the upper node.
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