The task state segment is a special structure on x86-based computers which holds information about a task. It is used by the operating system kernel for task management. Specifically, the following information is stored in the TSS:
- Processor register state
- I/O port permissions
- Inner-level stack pointers
- Previous TSS link
All this information should be stored at specific locations within the TSS as specified in the IA-32 manuals.
Read more about Task State Segment: Location of The TSS, Task Register, Register States, I/O Port Permissions, Inner-level Stack Pointers, Previous TSS Link, Use of TSS in Linux, Exceptions Related To The TSS, TSS in X86-64 Mode
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