Interrupts & Traps

最新推荐文章于 2021-01-19 16:10:35 发布

原创最新推荐文章于 2021-01-19 16:10:35 发布 · 1k 阅读

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#interface #assembly #signal #basic #timer #rest

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博客从PC汇编语言和操作系统原理角度探讨中断和陷阱。在PC汇编中，中断分外部和内部，内部含陷阱和软件中断；操作系统里，中断用于进程和设备管理，陷阱通过内部机制处理。作者认为中断和陷阱本质相同，软件中断和SVC指同一事物。

view point of PC Assembly Language by Paul A. Carter

Interrupts ---------- external : caused by devices outside the CPU
              |
              |
              |
              |
              |______ internal : raised from within the CPU
                            |
                           |
                           |------ Traps : Error interrupts (generally do not return)
                           |
                           |______ software interrupts : Interrupts generated from the interrupt Instruction (e.g DOS uses these to implement its API , modern OSs use a C based interface or a lower lever interface at the kernel lever)

view point of Operating Systems Principles by Lubomir F. Bic & Alan C. Shaw

Interrupts : a hardware signal issued to the CPU from some external device
         |
         |
         |------ Process management (a time-out interrupt generated by a timer device)
         |
         |______ Device management (e.g I/O devices)

Traps : handled through internal interrupt mechanisms
    |
    |
    |------ overflow or underflow
    |
    |
    |------ pages/segments management
    |
    |
    |______ SVC (supervisor call , which form the basic interface between the OS kernel and the rest of the software)

my opinion

Interrupts and Traps are same enssentially , the software interrupts and the SVC refer the same thing.