kernel/src/cpu/tss.c


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#include <tss.h>
#include <heap.h>
#include <libk/stdio.h>
#include <libk/string.h>

tss_type tss;

void load_tss()
{
	__asm__ __volatile__("push %rax; mov $0x28, %ax; ltr %ax; pop %rax;");
}

void init_tss()
{
	memset(&tss, 0, sizeof(tss_type));
	tss.iopb = sizeof(tss_type);
	uint32_t stack_size = 1024 * 16;
	uint64_t stack = (uint64_t)kalloc(stack_size) + stack_size - 8;
	tss.rsp0_low = (uint32_t)stack;
	tss.rsp0_high = (uint32_t)(stack >> 32);

	uint32_t ist1_stack_size = 1024 * 32;
	uint64_t ist1_stack =
		(uint64_t)kalloc(ist1_stack_size) + ist1_stack_size - 8;
	tss.ist1_low = (uint32_t)ist1_stack;
	tss.ist1_high = (uint32_t)(ist1_stack >> 32);

	uint32_t ist2_stack_size = 1024 * 32;
	uint64_t ist2_stack =
		(uint64_t)kalloc(ist2_stack_size) + ist2_stack_size - 8;
	tss.ist2_low = (uint32_t)ist2_stack;
	tss.ist2_high = (uint32_t)(ist2_stack >> 32);

	load_tss();
}