tests/test-i386-vm86.S

   1         .code16
   2         .globl vm86_code_start
   3         .globl vm86_code_end
   4
   5 #define GET_OFFSET(x) ((x) - vm86_code_start + 0x100)
   6
   7 vm86_code_start:
   8         movw $GET_OFFSET(hello_world), %dx
   9         movb $0x09, %ah
  10         int $0x21
  11
  12         /* prepare int 0x90 vector */
  13         xorw %ax, %ax
  14         movw %ax, %es
  15         es movw $GET_OFFSET(int90_test), 0x90 * 4
  16         es movw %cs, 0x90 * 4 + 2
  17
  18         /* launch int 0x90 */
  19
  20         int $0x90
  21
  22         /* test IF support */
  23         movw $GET_OFFSET(IF_msg), %dx
  24         movb $0x09, %ah
  25         int $0x21
  26
  27         pushf
  28         popw %dx
  29         movb $0xff, %ah
  30         int $0x21
  31
  32         cli
  33         pushf
  34         popw %dx
  35         movb $0xff, %ah
  36         int $0x21
  37
  38         sti
  39         pushfl
  40         popl %edx
  41         movb $0xff, %ah
  42         int $0x21
  43
  44 #if 0
  45         movw $GET_OFFSET(IF_msg1), %dx
  46         movb $0x09, %ah
  47         int $0x21
  48
  49         pushf
  50         movw %sp, %bx
  51         andw $~0x200, (%bx)
  52         popf
  53 #else
  54         cli
  55 #endif
  56
  57         pushf
  58         popw %dx
  59         movb $0xff, %ah
  60         int $0x21
  61
  62         pushfl
  63         movw %sp, %bx
  64         orw $0x200, (%bx)
  65         popfl
  66
  67         pushfl
  68         popl %edx
  69         movb $0xff, %ah
  70         int $0x21
  71
  72         movb $0x00, %ah
  73         int $0x21
  74
  75 int90_test:
  76         pushf
  77         pop %dx
  78         movb $0xff, %ah
  79         int $0x21
  80
  81         movw %sp, %bx
  82         movw 4(%bx), %dx
  83         movb $0xff, %ah
  84         int $0x21
  85
  86         movw $GET_OFFSET(int90_msg), %dx
  87         movb $0x09, %ah
  88         int $0x21
  89         iret
  90
  91 int90_msg:
  92         .string "INT90 started\n$"
  93
  94 hello_world:
  95         .string "Hello VM86 world\n$"
  96
  97 IF_msg:
  98         .string "VM86 IF test\n$"
  99
 100 IF_msg1:
 101         .string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
 102
 103 vm86_code_end: