μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is propos...μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is proposed. The basic idea is adding round-robin scheduling strategy in its original scheduler in order to schedule homology priority tasks through time slice roundrobin. Implementation approach is given in detail. Firstly, the Task Control Block （TCB） is extended. And then, a new priority index table is created, in which each index pointer points to a set of homology priority tasks. Eventually, on the basis of reconstructing μC/OS-Ⅱ real-time kernel, task scheduling module is rewritten. Otherwise, schedulability of homology task supported by modified kernel had been analyzed, and deadline formula of created homology tasks is given. By theoretical analysis and experiment verification, the modified kernel can support homology priority tasks scheduling, meanwhile, it also remains preemptive property of original μC/OS-Ⅱ.展开更多
设备软件优化（DSO）厂商风河系统公司日前宣布．风河已取得由FSM实验室（Finite State Machine Labs．Inc,FSMLabs）开发的设备软件业界惟一的商用级“硬”实时（hard real-time）Linux技术——RTLinux。风河公司此次获得了该项技术的...设备软件优化（DSO）厂商风河系统公司日前宣布．风河已取得由FSM实验室（Finite State Machine Labs．Inc,FSMLabs）开发的设备软件业界惟一的商用级“硬”实时（hard real-time）Linux技术——RTLinux。风河公司此次获得了该项技术的全套知识产权．包括专利权，著作权、商标注册和其他相关产品的所有权。展开更多
This thesis introduces how to develop kernel level device driver on Linux platform in detail. On the basis of comparing proc file system with dev file system, we choose PCI device and USB device as instances to introd...This thesis introduces how to develop kernel level device driver on Linux platform in detail. On the basis of comparing proc file system with dev file system, we choose PCI device and USB device as instances to introduce the method of writing device driver for char devices by using these two file systems.展开更多
The first implementation of new E6 stack of networking protocols within the kernel of an operating system is presented. Stack E6 was developed to increase the efficiency of a network entirely built on the base of Ethe...The first implementation of new E6 stack of networking protocols within the kernel of an operating system is presented. Stack E6 was developed to increase the efficiency of a network entirely built on the base of Ethernet technology. It uses a uniform hierarchical E6 address on all the levels and annuls TCP, UDP and IP protocols. The experimental implementation adds a new system call to the kernel of Linux and a new type of Ethernet E6 frame. All the application interface standards are saved according to RFC except of E6 address usage instead of IP address and instead of Ethernet MAC address as well.展开更多
目前,国内外很多厂商推出了Linux系统中的终端检测响应(Endpoint Detection and Response,EDR)系统,为云平台、物联网、大数据计算等基础设施提供全面的安全检测和防护服务。但是,针对EDR文件防护功能的绕过攻击能够帮助恶意行为规避监...目前,国内外很多厂商推出了Linux系统中的终端检测响应(Endpoint Detection and Response,EDR)系统,为云平台、物联网、大数据计算等基础设施提供全面的安全检测和防护服务。但是,针对EDR文件防护功能的绕过攻击能够帮助恶意行为规避监控,造成严重的系统和数据安全风险。针对开源和商业闭源的Linux EDR系统,首先,阐述了文件防护功能的底层实现机制,对其核心技术原理进行了分析;其次,重点梳理了4种现有公开的文件防护绕过技术,提出了3种尚未公开的绕过技术,并且总结提炼为3种攻击类型;再次,基于上述绕过技术编写了验证工具,通过测试证明了这些技术方法对于部分Linux EDR系统的文件防护绕过能力;最后,给出了相应的安全防护建议。展开更多
基金Supported by the "Chunhui" Plan of Ministry of Education of China (Z2005-2-11013)
文摘μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is proposed. The basic idea is adding round-robin scheduling strategy in its original scheduler in order to schedule homology priority tasks through time slice roundrobin. Implementation approach is given in detail. Firstly, the Task Control Block （TCB） is extended. And then, a new priority index table is created, in which each index pointer points to a set of homology priority tasks. Eventually, on the basis of reconstructing μC/OS-Ⅱ real-time kernel, task scheduling module is rewritten. Otherwise, schedulability of homology task supported by modified kernel had been analyzed, and deadline formula of created homology tasks is given. By theoretical analysis and experiment verification, the modified kernel can support homology priority tasks scheduling, meanwhile, it also remains preemptive property of original μC/OS-Ⅱ.
文摘16．09．06‐NI （美国国家仪器公司，National Instruments ，简称NI）作为致力于为工程师和科学家提供解决方案来应对全球最严峻的工程挑战的供应商，宣布推出LabVIEW Communications系统设计套件2．0这一个专门用于无线通信系统原型开发的设计环境。新版本增加了NI Linux Real‐Time 功能，适用于所有软件定义无线电（SDR）产品，包括NI USRP RIO 和FlexRIO 。新增的功能可帮助工程师开发在 NI Linux Real‐Time 操作系统上运行实时算法，并与其他工具搭配使用，将协议栈上移到M AC层和网络层，同时访问搭建完整系统原型所需要的庞大的开源工具和技术库，系统原型的搭建是推进5G 项目的关键。
文摘设备软件优化（DSO）厂商风河系统公司日前宣布．风河已取得由FSM实验室（Finite State Machine Labs．Inc,FSMLabs）开发的设备软件业界惟一的商用级“硬”实时（hard real-time）Linux技术——RTLinux。风河公司此次获得了该项技术的全套知识产权．包括专利权，著作权、商标注册和其他相关产品的所有权。
文摘This thesis introduces how to develop kernel level device driver on Linux platform in detail. On the basis of comparing proc file system with dev file system, we choose PCI device and USB device as instances to introduce the method of writing device driver for char devices by using these two file systems.
文摘The first implementation of new E6 stack of networking protocols within the kernel of an operating system is presented. Stack E6 was developed to increase the efficiency of a network entirely built on the base of Ethernet technology. It uses a uniform hierarchical E6 address on all the levels and annuls TCP, UDP and IP protocols. The experimental implementation adds a new system call to the kernel of Linux and a new type of Ethernet E6 frame. All the application interface standards are saved according to RFC except of E6 address usage instead of IP address and instead of Ethernet MAC address as well.
