kernel/kernel.c

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