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Philipp Oppermann
2020-02-21 11:53:34 +01:00
parent 361108b88e
commit 0619f3a9e7
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blog/content/second-edition/posts/06-double-faults/index.md
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@@ -128,12 +128,12 @@ First Exception | Second Exception
[Divide-by-zero],<br>[Invalid TSS],<br>[Segment Not Present],<br>[Stack-Segment Fault],<br>[General Protection Fault] | [Invalid TSS],<br>[Segment Not Present],<br>[Stack-Segment Fault],<br>[General Protection Fault]
[Page Fault] | [Page Fault],<br>[Invalid TSS],<br>[Segment Not Present],<br>[Stack-Segment Fault],<br>[General Protection Fault]
[Divide-by-zero]: http://wiki.osdev.org/Exceptions#Divide-by-zero_Error
[Invalid TSS]: http://wiki.osdev.org/Exceptions#Invalid_TSS
[Segment Not Present]: http://wiki.osdev.org/Exceptions#Segment_Not_Present
[Stack-Segment Fault]: http://wiki.osdev.org/Exceptions#Stack-Segment_Fault
[General Protection Fault]: http://wiki.osdev.org/Exceptions#General_Protection_Fault
[Page Fault]: http://wiki.osdev.org/Exceptions#Page_Fault
[Divide-by-zero]: https://wiki.osdev.org/Exceptions#Divide-by-zero_Error
[Invalid TSS]: https://wiki.osdev.org/Exceptions#Invalid_TSS
[Segment Not Present]: https://wiki.osdev.org/Exceptions#Segment_Not_Present
[Stack-Segment Fault]: https://wiki.osdev.org/Exceptions#Stack-Segment_Fault
[General Protection Fault]: https://wiki.osdev.org/Exceptions#General_Protection_Fault
[Page Fault]: https://wiki.osdev.org/Exceptions#Page_Fault
[AMD64 manual]: https://www.amd.com/system/files/TechDocs/24593.pdf
@@ -206,7 +206,7 @@ For each exception handler, we can choose a stack from the IST through the `stac
The Interrupt Stack Table (IST) is part of an old legacy structure called _[Task State Segment]_ \(TSS). The TSS used to hold various information (e.g. processor register state) about a task in 32-bit mode and was for example used for [hardware context switching]. However, hardware context switching is no longer supported in 64-bit mode and the format of the TSS changed completely.
[Task State Segment]: https://en.wikipedia.org/wiki/Task_state_segment
[hardware context switching]: http://wiki.osdev.org/Context_Switching#Hardware_Context_Switching
[hardware context switching]: https://wiki.osdev.org/Context_Switching#Hardware_Context_Switching
On x86_64, the TSS no longer holds any task specific information at all. Instead, it holds two stack tables (the IST is one of them). The only common field between the 32-bit and 64-bit TSS is the pointer to the [I/O port permissions bitmap].