kernel/kernel.c

   1 #include <tty.h>
   2 #include <io.h>
   3 #include <irq/idt.h>
   4 #include <irq/i8259a.h>
   5 #include <stdint.h>
   6 #include <mm/paging.h>
   7
   8 extern void double_fault(struct abort_frame *frame);
   9 extern void keyb_handler(struct interrupt_frame *frame);
  10 extern void pf_handler(struct fault_frame *frame);
  11 static struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
  12 static struct idtr idtr __attribute__((aligned(0x10)));
  13
  14 struct e820_map {
  15         uint64_t base;
  16         uint64_t length;
  17         uint32_t type;
  18         uint32_t attrib;
  19 };
  20
  21 void print_e820(struct e820_map *mmap, int mmap_size)
  22 {
  23         kprint("       Base       |      Length      |   Type   |  Attrib  |\n", 0);
  24         kprint("------------------------------------------------------------\n", 0);
  25         for (int i=0; i<mmap_size; i++) {
  26                 kprintq(mmap[i].base);
  27                 kprintc('|', 0);
  28                 kprintq(mmap[i].length);
  29                 kprintc('|', 0);
  30                 kprintd(mmap[i].type);
  31                 kprintc('|', 0);
  32                 kprintd(mmap[i].attrib);
  33                 kprintc('|', 0);
  34                 kprintc('\n', 0);
  35         }
  36 }
  37
  38 void kmain(struct e820_map *mmap, int mmap_size)
  39 {
  40         screen_clear();
  41         kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
  42         kprint(GIT_COMMIT, 0);
  43         kprint("\n", 0);
  44         kprint("BIOS memory map:\n", 0);
  45         print_e820(mmap, mmap_size);
  46         kprint("Preparing IDT...\n", 0);
  47         idt_set_descriptor(idt, 8, 0x8, (uint32_t) double_fault, IDT_INTERRUPT_GATE, 0x0);
  48         idt_set_descriptor(idt, 14, 0x8, (uint32_t) pf_handler, IDT_INTERRUPT_GATE, 0x0);
  49         idt_set_descriptor(idt, 33, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
  50         kprint("IDT prepared, loading...\n", 0);
  51         populate_idtr(&idtr, idt);
  52         load_idt(idtr);
  53         kprint("IDT loaded, enabling interrupts...\n", 0);
  54         pic_init(0x20, 0x28);
  55         pic_mask_all();
  56         pic_unmask(1);
  57         asm volatile ("sti");
  58         kprint("All done\n", 0);
  59         while(1);
  60 }