Interrupts & Traps _traps interrupts-优快云博客

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。

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view point of PC Assembly Language by Paul A. Carter

Interrupts ---------- external : caused by devices outside the CPU
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              |______ internal : raised from within the CPU
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                           |------ Traps : Error interrupts (generally do not return)
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                           |______ 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
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         |------ Process management (a time-out interrupt generated by a timer device)
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         |______ Device management (e.g I/O devices)

Traps : handled through internal interrupt mechanisms
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    |------ overflow or underflow
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    |------ pages/segments management
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    |______ 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.