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操作系统对系统硬件有着十分密切的联系。系统硬件与操作系统软件有机地结合起来,实现了对计算机系统的组织和管理。系统硬件介绍三方面的问题:特权指令,中断系统,输入输出系统。这些将从软件的角度来进一步加以认识。一、特权指令 (一)特权指令的作用计算机专门为操作系统提供的用户不能使用的指令称作特权指令。由于操作系统负有统一调度管理计算机系统资源的职责,所以要给它一些特权,这些权力
Operating system on the system hardware has a very close contact. System hardware and operating system software organically combine to achieve the organization and management of computer systems. System hardware introduced three issues: privileged instructions, interrupt system, input and output system. These will be further recognized from a software perspective. First, the privilege instructions (a) the role of privileged instructions Computer specifically provided for the operating system can not be used by the user instructions called privileged instructions. Because the operating system has the responsibility of a unified scheduling management of computer system resources, so give it some privileges, these powers