kernel/kernel.c

   1 #include <tty.h>
   2 #include <io.h>
   3 #include <irq/idt.h>
   4 #include <irq/i8259a.h>
   5 #include <time/i8254.h>
   6 #include <stdint.h>
   7
   8 extern void double_fault(struct abort_frame *frame);
   9 extern void keyb_handler(struct interrupt_frame *frame);
  10 extern void timer_tick(struct interrupt_frame *frame);
  11 struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
  12 struct idtr idtr __attribute__((aligned(0x10)));
  13
  14 void kmain(void)
  15 {
  16         ticks = 0;
  17         screen_clear();
  18         kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
  19         kprint(GIT_COMMIT, 0);
  20         kprint("\n", 0);
  21         kprint("Preparing IDT...\n", 0);
  22         idt_set_descriptor(idt, 0x8, 0x8, (uint32_t) double_fault, IDT_TRAP_GATE, 0x0);
  23         idt_set_descriptor(idt, 0x20, 0x8, (uint32_t) timer_tick, IDT_INTERRUPT_GATE, 0x0);
  24         idt_set_descriptor(idt, 0x21, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
  25         kprint("IDT prepared, loading...\n", 0);
  26         populate_idtr(&idtr, idt);
  27         load_idt(idtr);
  28         kprint("IDT loaded, enabling interrupts...\n", 0);
  29         pic_init(0x20, 0x28);
  30         pic_mask_all();
  31         pic_unmask(1);
  32         asm volatile ("sti");
  33         kprint("Setting up timer...\n", 0);
  34         i8254_configure_channel(0, SQUARE_WAVE_GENERATOR, 0);
  35         i8254_irq_enable();
  36         kprint("All done\n", 0);
  37         while(1);
  38 }