kernel/kernel/kernel.c

   1 #include <kprint.h>
   2 #include <io.h>
   3 #include <irq/idt.h>
   4 #include <irq/interrupt.h>
   5 #include <irq/i8259a.h>
   6 #include <input/ps2.h>
   7 #include <stdint.h>
   8 #include <mm/paging.h>
   9 #include <panic.h>
  10
  11 struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
  12 struct idtr idtr __attribute__((aligned(0x10)));
  13 extern void (*_int_handler_table[48])(void);
  14
  15 struct e820_map {
  16         uint64_t base;
  17         uint64_t length;
  18         uint32_t type;
  19         uint32_t attrib;
  20 };
  21
  22 void print_e820(struct e820_map *mmap, int mmap_size)
  23 {
  24         kprint("       Base       |      Length      |   Type   |  Attrib  |\n", VGA_LIGHT_GRAY, VGA_BLACK);
  25         kprint("------------------------------------------------------------\n", VGA_LIGHT_GRAY, VGA_BLACK);
  26         for (int i=0; i<mmap_size; i++) {
  27                 kprintq(mmap[i].base, 1);
  28                 kprintc('|', VGA_LIGHT_GRAY, VGA_BLACK);
  29                 kprintq(mmap[i].length, 1);
  30                 kprintc('|', VGA_LIGHT_GRAY, VGA_BLACK);
  31                 kprintd(mmap[i].type, 1);
  32                 kprintc('|', VGA_LIGHT_GRAY, VGA_BLACK);
  33                 kprintd(mmap[i].attrib, 1);
  34                 kprintc('|', VGA_LIGHT_GRAY, VGA_BLACK);
  35                 kprintc('\n', VGA_LIGHT_GRAY, VGA_BLACK);
  36         }
  37 }
  38
  39 /* Small handler for double faults. Will be put elsewhere eventually. */
  40 int double_fault_handler(struct interrupt_frame *frame)
  41 {
  42         kprint("Double fault occurred!\n", VGA_BRIGHT_RED, VGA_BLACK);
  43         kprint("EAX: ", VGA_LIGHT_GRAY, VGA_BLACK);
  44         kprintd(frame->eax, 1);
  45         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  46         kprint("EBX: ", VGA_LIGHT_GRAY, VGA_BLACK);
  47         kprintd(frame->ebx, 1);
  48         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  49         kprint("ECX: ", VGA_LIGHT_GRAY, VGA_BLACK);
  50         kprintd(frame->ecx, 1);
  51         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  52         kprint("EDX: ", VGA_LIGHT_GRAY, VGA_BLACK);
  53         kprintd(frame->edx, 1);
  54         kprintc('\n', VGA_LIGHT_GRAY, VGA_BLACK);
  55         kprint("EBP: ", VGA_LIGHT_GRAY, VGA_BLACK);
  56         kprintd(frame->ebp, 1);
  57         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  58         kprint("ESP: ", VGA_LIGHT_GRAY, VGA_BLACK);
  59         kprintd(frame->esp, 1);
  60         kprintc('\n', VGA_LIGHT_GRAY, VGA_BLACK);
  61         kprint("ESI: ", VGA_LIGHT_GRAY, VGA_BLACK);
  62         kprintd(frame->esi, 1);
  63         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  64         kprint("EDI: ", VGA_LIGHT_GRAY, VGA_BLACK);
  65         kprintd(frame->edi, 1);
  66         kprintc('\n', VGA_LIGHT_GRAY, VGA_BLACK);
  67         kprint("EIP: ", VGA_LIGHT_GRAY, VGA_BLACK);
  68         kprintd(frame->eip, 1);
  69         kprintc(' ', VGA_LIGHT_GRAY, VGA_BLACK);
  70         kprint("EFLAGS: ", VGA_LIGHT_GRAY, VGA_BLACK);
  71         kprintd(frame->eflags, 1);
  72         kprintc('\n', VGA_LIGHT_GRAY, VGA_BLACK);
  73         PANIC("double fault");
  74 }
  75
  76 void kmain(struct e820_map *mmap, int mmap_size)
  77 {
  78         vga_initialize();
  79         kprint("Welcome to Nameless OS!\nRunning revision: ", VGA_LIGHT_GRAY, VGA_BLACK);
  80         kprint(GIT_COMMIT, VGA_LIGHT_GRAY, VGA_BLACK);
  81         kprint("\n", VGA_LIGHT_GRAY, VGA_BLACK);
  82         kprint("BIOS memory map:\n", VGA_LIGHT_GRAY, VGA_BLACK);
  83         print_e820(mmap, mmap_size);
  84         kprint("Preparing IDT...\n", VGA_LIGHT_GRAY, VGA_BLACK);
  85         for (int i=0; i<48; i++) {
  86                 idt_set_descriptor(idt, i, 0x8, _int_handler_table[i], IDT_INTERRUPT_GATE, 0);
  87         }
  88         kprint("IDT prepared, loading...\n", VGA_LIGHT_GRAY, VGA_BLACK);
  89         populate_idtr(&idtr, idt);
  90         load_idt(idtr);
  91         kprint("Setting up interrupts...\n", VGA_LIGHT_GRAY, VGA_BLACK);
  92         register_interrupt(8, &double_fault_handler);
  93         pic_init(0x20, 0x28);
  94         pic_mask_all();
  95         asm volatile ("sti");
  96         kprint("Initializing PS/2...\n", VGA_LIGHT_GRAY, VGA_BLACK);
  97         int ret = ps2_initialize();
  98         switch (ret) {
  99         case -1:
 100                 kprint("No PS/2 devices found or something is faulty\n", VGA_LIGHT_GRAY, VGA_BLACK);
 101                 break;
 102         case 0:
 103                 kprint("One PS/2 device found\n", VGA_LIGHT_GRAY, VGA_BLACK);
 104                 break;
 105         case 1:
 106                 kprint("Two PS/2 devices found\n", VGA_LIGHT_GRAY, VGA_BLACK);
 107         }
 108         kprint("All done\n", VGA_LIGHT_GRAY, VGA_BLACK);
 109         while(1);
 110 }