# TSS structure generation and loading

The TSS management is defined in `shelter/lib/include/irq/tss.h` and implemented in `shelter/lib/include/irq/tss.c`. 

This implementation provides the following types:
- `sh_tss_TSS`: a full structure of a 64 bits TSS
- `sh_tss_TR`: a structure used to load the TSS

The following functions are provided:
- `sh_tss_fill_tss(sh_tss_TSS *tss)`: fill a TSS structure with 4 stacks dedicated for double faults, NMI, page faults and stack-related faults. Heap must be available for using this function. All stacks are 4 pages long 
- `sh_tss_load_tr(sh_tss_TSS* tss)`: load the provided TSS into the task register. Always assume that the TSS selector in the GDT is `0x28`