reactos/ntoskrnl/hal/x86/head.s

   1 #define NR_TASKS 128
   2
   3 .globl _stext
   4 .globl _idt
   5 .globl _gdt
   6 .globl _start
   7 .globl _mainCRTStartup
   8 .globl start
   9
  10 _stext:
  11 _mainCRTStartup:
  12 _start:
  13 start:
  14         lidt    _idt_descr
  15         lgdt    _gdt_descr
  16
  17         movw    $0x28,%ax
  18         movw    %ax,%ds
  19
  20         popl    %eax
  21         popl    %eax
  22         movl    $_init_stack_top,%esp
  23         pushl   %eax
  24         pushl   $0
  25
  26         jmp     __main
  27
  28 .data
  29 _gdt:
  30         .word 0
  31         .word 0
  32         .word 0
  33         .word 0
  34
  35         .word 0x0000
  36         .word 0x0000
  37         .word 0xfa00
  38         .word 0x00cc
  39
  40         .word 0x0000
  41         .word 0x0000
  42         .word 0xf200
  43         .word 0x00cc
  44
  45         .word 0xffff
  46         .word 0x0000
  47         .word 0x9200
  48         .word 0x00cf
  49
  50         .word 0xffff
  51         .word 0x0000
  52         .word 0x9a00
  53         .word 0x00cf
  54
  55         .word 0xffff
  56         .word 0x0000
  57         .word 0x9200
  58         .word 0x00cf
  59
  60          .fill 128,8,0
  61
  62 _idt_descr:
  63         .word (256*8)-1
  64         .long _idt
  65
  66 _gdt_descr:
  67 /*        .word ((6+128)*8)-1 */
  68         .word ((6+NR_TASKS)*8)-1
  69         .long _gdt
  70
  71 _idt:
  72         .fill 256,8,0
  73
  74 _init_stack:
  75         .fill 4096,1,0
  76 _init_stack_top:
  77
  78 #if 0
  79 _stext:
  80 #endif
  81