C++ (Cpp) write_tr Examples

Example #1

File: kvm.c Project: dpingg/os-lab1

void
init_segment(void) {
	memset(gdt, 0, sizeof(gdt));
	set_segment(&gdt[SEG_KERNEL_CODE], DPL_KERNEL, SEG_EXECUTABLE | SEG_READABLE);
	set_segment(&gdt[SEG_KERNEL_DATA], DPL_KERNEL, SEG_WRITABLE );
	set_segment(&gdt[SEG_USER_CODE], DPL_USER, SEG_EXECUTABLE | SEG_READABLE);
	set_segment(&gdt[SEG_USER_DATA], DPL_USER, SEG_WRITABLE );

	write_gdtr(gdt, sizeof(gdt));

	set_tss(&gdt[SEG_TSS]);
	write_tr( SELECTOR_USER(SEG_TSS) );
}

Example #2

File: task.c Project: BackupTheBerlios/socratix

void init_sched (void)
{
	unsigned long eflags;

	eflags = read_flags ();

	if ((idle_task = kmalloc (sizeof (Task), 0)) == NULL) {
		printk ("init_sched: not enough memory\n");
		write_flags (eflags);
		return;
	}

	idle_task->pid		= next_pid++;
	idle_task->next		= idle_task;
#if 0
	idle_task->kernel_stack	= kstack;
#endif
	idle_task->tss.link	= 0;
	idle_task->tss.esp0	= (unsigned long) &kstack[PAGE_SIZE >> 2];
	idle_task->tss.ss0	= KERNEL_DS;
	idle_task->tss.cr3	= (unsigned long) &pg_dir[0];
	idle_task->tss.es	= KERNEL_DS;
	idle_task->tss.cs	= KERNEL_CS;
	idle_task->tss.ss	= KERNEL_DS;
	idle_task->tss.ds	= KERNEL_DS;
	idle_task->tss.fs	= KERNEL_DS;
	idle_task->tss.gs	= KERNEL_DS;

	current = idle_task;
	set_tss (idle_task);

	write_tr (idle_task->tss.tr);

	cli ();
	register_interrupt (0x08, do_timer);
	register_interrupt (0x80, do_fork);

	outb(0x36,0x43);
	outb(0xa9,0x40);
	outb(0x04,0x40);

	write_flags (eflags);
}