Module tss 

Task State Segment (TSS) for Strat9-OS

The TSS is required for:

• Interrupt Stack Table (IST) entries for safe exception handling
• Ring 3 -> Ring 0 stack switching (privilege_stack_table[0] = rsp0)

Constants

DOUBLE_FAULT_IST_INDEX

IST index used for the double fault handler

Functions

init

Initialize the TSS with IST entries

init_cpu

Initialize the TSS for a given CPU index.

set_kernel_stack

Update TSS.rsp0 — the kernel stack pointer used when transitioning from Ring 3 to Ring 0 on interrupt/syscall.

set_kernel_stack_for

Update TSS.rsp0 for a specific CPU index.

tss_for

Get a reference to the TSS for a given CPU index (for GDT descriptor creation).