LXR qemu/tests/tcg/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
   7vm86_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
  75int90_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 $0x21
  89        iret
  90
  91int90_msg:
  92        .string "INT90 started\n$"
  93
  94hello_world:
  95        .string "Hello VM86 world\n$"
  96
  97IF_msg:
  98        .string "VM86 IF test\n$"
  99
 100IF_msg1:
 101        .string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
 102
 103vm86_code_end:
 104