t_error ia32_thread_init(void)
{
THREAD_ENTER(thread);
o_as* as;
t_vaddr int_stack;
/*
* 1)
*/
if (as_get(kasid, &as) != ERROR_NONE)
THREAD_LEAVE(thread, ERROR_UNKNOWN);
/*
* 2)
*/
if (map_reserve(kasid,
MAP_OPT_PRIVILEGED,
3 * PAGESZ,
PERM_READ | PERM_WRITE,
(t_vaddr*)&thread->machdep.tss) != ERROR_NONE)
THREAD_LEAVE(thread, ERROR_UNKNOWN);
memset(thread->machdep.tss, 0x0, sizeof(t_ia32_tss));
/*
* 3)
*/
if (map_reserve(kasid,
MAP_OPT_PRIVILEGED,
2 * PAGESZ,
PERM_READ | PERM_WRITE,
&int_stack) != ERROR_NONE)
THREAD_LEAVE(thread, ERROR_UNKNOWN);
/*
* 4)
*/
if (tss_load(thread->machdep.tss,
SEGSEL(PMODE_GDT_CORE_DS, PRIV_RING0),
int_stack + 2 * PAGESZ - 16,
0x68) != ERROR_NONE)
THREAD_LEAVE(thread, ERROR_UNKNOWN);
gl_stack_int = int_stack + 2 * PAGESZ - 16;
/*
* 5)
*/
if (tss_init(thread->machdep.tss) != ERROR_NONE)
THREAD_LEAVE(thread, ERROR_UNKNOWN);
THREAD_LEAVE(thread, ERROR_NONE);
}
/*
* ³õʼ»¯tss
*/
void tss_init()
{
int i = gdt_add(desc_create((u32)&tss,sizeof(tss),DA_386TSS));
gdt_load();
tss.iobase = (u16)(u32)&tss.iomap;
tss.end = 0xff;
tss.ss0 = GdtGetSel(KERNEL_DATA,0);
tss.esp0 = 0x80000;
tss_sel = GdtGetSel(i,0);
tss_load(tss_sel);
}
void tss_switch(uint32_t new_tss_ss) {
if (cur_tss_ss != -1)
tss_save(cur_tss_ss);
cur_tss_ss = new_tss_ss;
tss_load(cur_tss_ss);
}