/*
clear the screen and changeColor
*/
void change()
{
close_int();
disp_pos=0;
int i;
for(i=0; i<80*25; i++)
disp_str(" ");
disp_pos=0;
init_screen(tty_table);
changeColor();
open_int();
}
void scheduler()
{
for (;;)
{
struct process *proc =
current_proc ? current_proc->next : list_head.next;
/* Find a runnable process */
while (proc == &list_head || proc->state != PROC_STATE_RUNNING)
{
if (proc != &list_head && proc->state == PROC_STATE_DEAD)
{
/* Release the dead process */
struct process *dead = proc;
proc = proc->next;
sched_remove(dead);
proc_free(dead);
}
else
{
proc = proc->next;
}
}
close_int();
current_proc = proc;
/* Update TSS */
tss.ss0 = KERNEL_DATA_SELECTOR;
tss.esp0 = proc->kernel_stack;
flush_tss();
/* Change to process virtual address space */
set_cr3(CAST_VIRTUAL_TO_PHYSICAL(proc->page_dir));
if (!proc->context)
init_context(proc);
switch_kcontext(&sched_context, proc->context);
/* Call schedule task */
if (sched_task)
{
sched_task(current_proc);
sched_task = NULL;
}
}
}