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The task state segment (TSS) 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. ==Location of the TSS== The TSS may reside anywhere in memory. A special segment register called the task register (TR) holds a segment selector that points to a valid TSS segment descriptor which resides in the GDT (a TSS descriptor may not reside in the LDT). Therefore, to use a TSS the following must be done by the operating system kernel: # Create a TSS descriptor entry in the GDT # Load the TR with a segment selector for that segment # Add information to the TSS in memory as needed For security purposes, the TSS should be placed in memory that is accessible only to the kernel. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Task state segment」の詳細全文を読む スポンサード リンク
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