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 struct abort_frame;
   9 struct interrupt_frame;
  10 struct fault_frame;
  11 extern void double_fault(struct abort_frame *frame);
  12 extern void keyb_handler(struct interrupt_frame *frame);
  13 extern void pf_handler(struct fault_frame *frame);
  14 static struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
  15 static struct idtr idtr __attribute__((aligned(0x10)));
  16
  17 struct e820_map {
  18         uint64_t base;
  19         uint64_t length;
  20         uint32_t type;
  21         uint32_t attrib;
  22 };
  23
  24 void print_e820(struct e820_map *mmap, int mmap_size)
  25 {
  26         kprint("       Base       |      Length      |   Type   |  Attrib  |\n", 0);
  27         kprint("------------------------------------------------------------\n", 0);
  28         for (int i=0; i<mmap_size; i++) {
  29                 kprintq(mmap[i].base);
  30                 kprintc('|', 0);
  31                 kprintq(mmap[i].length);
  32                 kprintc('|', 0);
  33                 kprintd(mmap[i].type);
  34                 kprintc('|', 0);
  35                 kprintd(mmap[i].attrib);
  36                 kprintc('|', 0);
  37                 kprintc('\n', 0);
  38         }
  39 }
  40
  41 void kmain(struct e820_map *mmap, int mmap_size)
  42 {
  43         screen_clear();
  44         kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
  45         kprint(GIT_COMMIT, 0);
  46         kprint("\n", 0);
  47         kprint("BIOS memory map:\n", 0);
  48         print_e820(mmap, mmap_size);
  49         kprint("Preparing IDT...\n", 0);
  50         idt_set_descriptor(idt, 8, 0x8, (uint32_t) double_fault, IDT_INTERRUPT_GATE, 0x0);
  51         idt_set_descriptor(idt, 14, 0x8, (uint32_t) pf_handler, IDT_INTERRUPT_GATE, 0x0);
  52         idt_set_descriptor(idt, 33, 0x8, (uint32_t) keyb_handler, IDT_INTERRUPT_GATE, 0x0);
  53         kprint("IDT prepared, loading...\n", 0);
  54         populate_idtr(&idtr, idt);
  55         load_idt(idtr);
  56         kprint("IDT loaded, enabling interrupts...\n", 0);
  57         pic_init(0x20, 0x28);
  58         pic_mask_all();
  59         pic_unmask(1);
  60         asm volatile ("sti");
  61         kprint("All done\n", 0);
  62         while(1);
  63 }