CN113806106A - Modem hardware abstraction layer facing VxWorks real-time process - Google Patents
Modem hardware abstraction layer facing VxWorks real-time process Download PDFInfo
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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
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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
- G06F9/44521—Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
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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
- G06F9/44594—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
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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
- G06F9/50—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 modem hardware abstraction layer facing to a VxWorks real-time process, which comprises a communication service library and a control service module, wherein the communication service library exists in a VxWorks application sharing library form, a kernel interface providing a waveform application for the control service module is registered as a system call to an operating system, and is packaged as a software interface according to an SCA standard, and the software interface is used for dynamically calling the waveform application in the real-time process form; the control service module is in a VxWorks loadable kernel module form, is loaded and resided in a VxWorks operating system, provides various functions of a modulation and demodulation hardware abstraction layer, and provides a related kernel interface for registering a communication service library. The invention can solve the engineering problem that a single processor node deploys a plurality of applications, and improves the integration level of the system.
Description
Technical Field
The invention relates to a modulation and demodulation Hardware Abstraction Layer (MHAL) based on a Software Communication Architecture (SCA) in a Software Defined Radio (SDR) system, in particular to a SCA MHAL facing VxWorks real-time process.
Background
The SDR enables the radio frequency equipment to have reconfigurable capability through the combination of hardware and software, and different radio frequency functions can be realized through changing the software on the premise of not changing the hardware. It changes the traditional concept, brings far-reaching influence to wireless communication from various aspects such as software, intellectualization, universalization, personalization and compatibility, etc., and gradually forms a huge industry equivalent to that of computers and program-controlled switches.
The SCA divides a software/hardware structure by an object-oriented method, establishes an open system standard, provides a software radio development framework irrelevant to specific implementation, and ensures the portability, the reconfiguration and the interoperability of equipment of software and hardware.
The SDR platform adopts various devices to form a heterogeneous computing network, and the nodes are communicated through a high-speed bus. The MHAL is designed for achieving barrier-free data transmission among different processing units, and data of a user layer is packaged into a uniform format through an interconnection bus and is sent out or received data is analyzed and transmitted to a user. In order to realize software and hardware decoupling and application deployment as required, the communication interfaces of the devices need to be packaged by the MHAL, so that the relevant functions of uniform communication interfaces, unified control of applications and the like are realized.
For real-time performance and reliability, a VxWorks embedded real-time operating system is generally adopted as a software running environment of a computing node. Due to the constraints of reliability and performance, in the conventional product, only one waveform application is usually deployed on one processor node, and the waveform application runs on a VxWorks kernel mode and serves as a kernel program to obtain the highest calculation and memory performance.
With the development of hardware technology, processors begin to develop towards multi-core, high-frequency and multi-interface directions, the performance of a single-chip processor often exceeds the requirement of a single application, a deployment mode that one processor runs one node is still adopted, the utilization rate of system resources is low, and the improvement of the integration level of a system is not facilitated. Therefore, the deployment of multiple applications by a single processor is a prominent requirement of current SDR systems. As a real-time operating system, applications in a plurality of kernel states are deployed in VxWorks, and various conflicts and faults are easily caused because the applications are not isolated.
VxWorks started from version 6.X and introduced Real time process technology (RTP) as a new software operating mode. The mode has the advantages that the application programs are independent and do not influence each other, and the stability of the kernel is improved. Each application runs in a user mode, the applications are invisible, system running is not influenced, and 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 kernel mode program 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 design of the type exists at present, the modulation and demodulation hardware abstraction layer facing the VxWorks real-time process is used for solving the problem that a single processor deploys multiple applications.
Disclosure of Invention
The invention provides a modulation and demodulation hardware abstraction layer for VxWorks real-time processes, 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 that a single processor node deploys a plurality of applications, and improves the integration level of a system.
The invention aims to be realized by the following technical scheme.
A modem hardware abstraction layer facing to VxWorks real-time process comprises a communication service library and a control service module, wherein the communication service library exists in a VxWorks application sharing library mode, a kernel interface providing waveform application for the control service module is registered as system call to an operating system, and is packaged as a software interface according to SCA standard, and the software interface is used for dynamic call of the waveform application in the real-time process mode;
the control service module is in a VxWorks loadable kernel module form, is loaded and resided in a VxWorks operating system, provides various functions of a modulation and demodulation hardware abstraction layer, and provides a related kernel interface for registering a communication service library.
According to the characteristics, when the control service module is started by the node, the control service module is loaded and operated by the kernel; 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 characteristics, the kernel interface provided by the control service module comprises a communication kernel interface, and the software interface packaged corresponding to the 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 a communication service library, judging whether the communication is carried out between two waveform applications of the same node or not by searching a mapping table, if not, transmitting the data from the bus according to specified bus parameters, and if so, 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 by searching the mapping table, and then the waveform application is transmitted to the corresponding waveform application through a communication software interface in the communication service library.
According to the characteristics, the kernel interface provided by the control service module also comprises a remote calling kernel interface, and the software interface packaged corresponding to the communication service library is a remote calling software interface;
after the control service module receives the remote call message of the superior node, the control service module judges which functions of the waveform application need to be called, and the waveform application registers related functions through a remote call software interface in a communication service library or acquires related call instructions to complete the execution of the specified functions.
According to the characteristics, after receiving an application loading instruction sent by a superior node, the control service module calls a corresponding waveform application file from the local storage device to load and run a specified waveform application.
According to the characteristics, the control service module completes the updating of the mapping table after receiving the mapping table updating instruction sent by the superior node, so as to provide the function of communication between the waveform applications of the control service module.
According to the characteristics, 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 the communication service library and carries out external communication or local communication through the control service module.
According to the characteristics, after receiving an application stop instruction sent by a superior node, the control service module notifies the waveform application stop 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 the control service module receives an application unloading instruction sent by the superior node, the specified waveform application is unloaded, and the resource is released.
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 deploying a plurality of waveforms by nodes;
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 modem hardware abstraction layer facing the VxWorks real-time process has universality, can be suitable for various processors running VxWorks, and can be expanded to scenes running other operating systems.
Drawings
FIG. 1 shows the composition and cross-linking relationship of a modem hardware abstraction layer for VxWorks real-time processes.
Fig. 2 is a flow diagram illustrating deployment of a waveform application on a node.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The following description is given first:
waveform application: a program running on the SDR platform performs a specific SCA compliant function to implement the desired radio functions.
A kernel module: and the software module running in the VxWorks kernel state is loaded into the VxWorks system as a kernel library and runs.
Application of shared libraries: and the software module running in the VxWorks user state is used as a shared library and called by waveform application.
Referring to fig. 1, a VxWorks real-time process-oriented modem hardware abstraction layer in this embodiment includes a control service module and a communication service library ("control service module" and "communication service library" are just names for easy identification, and other names may be used in practice).
1. Communication service library
The communication service library exists in a VxWorks application sharing library mode, a kernel interface which provides the waveform application for the control service module is registered as system call to an operating system and is packaged as a software interface according to an SCA standard, the software interface is used for dynamically calling the waveform application in a real-time process mode, and the access requirement of the waveform application on communication resources is transmitted to the control service module. Each waveform application can independently connect, invoke a software interface in the communication service library. The kernel interface provided by the control service module comprises a communication kernel interface and a remote calling kernel interface, and the software interfaces packaged corresponding to the communication service library are a communication software interface and a remote calling software interface respectively.
2. Control service module
The control service module is in a VxWorks loadable kernel module form, is loaded and resided in a VxWorks operating system, provides various functions of a modulation and demodulation hardware abstraction layer, and provides a related kernel interface for registering a communication service library.
The control service module has the following functions:
1) communication between wave applications: providing the input and output capacity of the bus and the state judgment capacity of the bus, and finishing the external bus communication function of the computing node; and shared memory is provided, so that the data interaction capacity between local applications is improved. The control service module provides a communication kernel interface for the registration of the communication service library and is packaged 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 or not by searching a mapping table, if not, transmitting the data from the bus according to specified bus parameters, and if so, 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 by searching the mapping table, and then the waveform application is transmitted to the corresponding waveform application through a 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 invocation: the upper node is provided with a service of remote procedure call, and the upper node can remotely call a specified function procedure of the local waveform application. The control service module provides a remote calling kernel interface for the registration of the communication service library and is packaged into a remote calling software interface. After receiving the remote call message of the superior node, the control service module judges which functions of the waveform application need to be called, and registers the related functions for the waveform application through a remote call software interface in the communication service library, or acquires the related call instruction to complete the execution of the designated functions.
3) And (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, so as to realize the control of the superior node on the computing node. After the instruction is executed, the control service module feeds back the execution result to the instruction sending party so that the sending party can confirm the result and make a decision.
4) Other functions.
When the control service module is started by the node, the control service module is loaded and operated by the kernel; the "communication service library" completes the connection when loaded by the waveform application.
Referring to fig. 2, the process of deploying waveform application on a node by the VxWorks real-time process-oriented modulation and demodulation hardware abstraction layer of the present invention is as follows:
step one, the node is started to finish the initialization of the control service module:
1. powering on the node, and starting a VxWorks operating system;
2. the node kernel loads a 'control service module', starts a related task provided by the control service module to be resident in the kernel as a background task, and a related kernel interface provided by the control service module waits for a waveform application to be called through a communication service library.
And secondly, starting the application:
1. after receiving an application loading instruction sent by a superior node, the control service module calls a corresponding waveform application file from local storage equipment, and loads and runs a specified waveform application;
2. after receiving a mapping table updating instruction sent by a superior node, the control service module completes the updating of the mapping table of the control service module so as to provide a function of communication between waveform applications of the control service module;
3. after the waveform application is started, the waveform application completes dynamic link to a communication service library through a VxWorks operating system so as to call a software interface of the communication service library.
4. And after receiving an application starting instruction sent by the superior node, the control service module informs the waveform application of starting a starting function, and the waveform application calls a related software interface through a communication service library and carries out external communication or local communication through the control service module.
Thirdly, stopping application:
1. after receiving an application stop instruction sent by a superior node, the control service module informs a waveform application stop function, and disconnects the link between the waveform application and a communication service library to stop the waveform application from communicating externally;
2. and after receiving the application unloading instruction sent by the superior node, the control service module unloads the specified waveform application and releases the resources.
Claims (9)
1. A modem hardware abstraction layer facing to VxWorks real-time process comprises a communication service library and a control service module, and is characterized in that the communication service library exists in a VxWorks application sharing library mode, a kernel interface providing waveform application for the control service module is registered as system call to an operating system, and is packaged as a software interface according to SCA standard, and the software interface is used for dynamic call of the waveform application in the real-time process mode;
the control service module is in a VxWorks loadable kernel module form, is loaded and resided in a VxWorks operating system, provides various functions of a modulation and demodulation hardware abstraction layer, and provides a related kernel interface for registering a communication service library.
2. The VxWorks real-time process-oriented modem hardware abstraction layer of claim 1, wherein the control service module is loaded and run by a kernel when being started by a node; 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.
3. The modem hardware abstraction layer for VxWorks real-time processes according to claim 1, wherein the kernel interface provided by the control service module comprises a communication kernel interface, and the software interface encapsulated corresponding to the 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 a communication service library, judging whether the communication is carried out between two waveform applications of the same node or not by searching a mapping table, if not, transmitting the data from the bus according to specified bus parameters, and if so, 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 by searching the mapping table, and then the waveform application is transmitted to the corresponding waveform application through a communication software interface in the communication service library.
4. The modem hardware abstraction layer for VxWorks real-time processes according to claim 1, wherein the kernel interface provided by the control service module further comprises a remote invocation kernel interface, and the software interface encapsulated corresponding to the communication service library is a remote invocation software interface;
after the control service module receives the remote call message of the superior node, the control service module judges which functions of the waveform application need to be called, and the waveform application registers related functions through a remote call software interface in a communication service library or acquires related call instructions to complete the execution of the specified functions.
5. The VxWorks real-time process-oriented modem hardware abstraction layer of claim 1, wherein the control service module calls a corresponding waveform application file from a local storage device after receiving an application loading instruction from a superior node, and loads and runs a specified waveform application.
6. The modem hardware abstraction layer for VxWorks real-time processes according to claim 1, wherein the control service module completes the mapping table update after receiving the mapping table update command sent by the superior node, so as to provide the function of communication between waveform applications of the control service module.
7. The VxWorks real-time process-oriented modem hardware abstraction layer as claimed in claim 1, wherein the control service module notifies the waveform application to start the start function after receiving an application start instruction from the superior node, the waveform application calls a related software interface through the communication service library, and the external communication or the local communication is performed through the control service module.
8. The VxWorks real-time process-oriented modem hardware abstraction layer as claimed in claim 1, wherein the control service module notifies the waveform application stop function after receiving an application stop instruction from the superior node, and disconnects the link between the waveform application and the communication service library to stop the waveform application from communicating externally.
9. The VxWorks real-time process-oriented modem hardware abstraction layer of claim 1, wherein the control service module unloads a specified waveform application and releases resources after receiving an application unloading instruction from a superior node.
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