Last change
on this file since 13428 was 1, checked in by vboxsync, 55 years ago |
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1 | .code16
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2 | .globl vm86_code_start
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3 | .globl vm86_code_end
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4 |
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5 | #define GET_OFFSET(x) ((x) - vm86_code_start + 0x100)
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6 |
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7 | vm86_code_start:
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8 | movw $GET_OFFSET(hello_world), %dx
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9 | movb $0x09, %ah
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10 | int $0x21
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11 |
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12 | /* prepare int 0x90 vector */
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13 | xorw %ax, %ax
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14 | movw %ax, %es
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15 | es movw $GET_OFFSET(int90_test), 0x90 * 4
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16 | es movw %cs, 0x90 * 4 + 2
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17 |
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18 | /* launch int 0x90 */
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19 |
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20 | int $0x90
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21 |
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22 | /* test IF support */
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23 | movw $GET_OFFSET(IF_msg), %dx
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24 | movb $0x09, %ah
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25 | int $0x21
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26 |
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27 | pushf
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28 | popw %dx
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29 | movb $0xff, %ah
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30 | int $0x21
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31 |
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32 | cli
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33 | pushf
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34 | popw %dx
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35 | movb $0xff, %ah
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36 | int $0x21
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37 |
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38 | sti
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39 | pushfl
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40 | popl %edx
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41 | movb $0xff, %ah
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42 | int $0x21
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43 |
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44 | #if 0
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45 | movw $GET_OFFSET(IF_msg1), %dx
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46 | movb $0x09, %ah
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47 | int $0x21
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48 |
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49 | pushf
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50 | movw %sp, %bx
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51 | andw $~0x200, (%bx)
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52 | popf
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53 | #else
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54 | cli
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55 | #endif
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56 |
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57 | pushf
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58 | popw %dx
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59 | movb $0xff, %ah
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60 | int $0x21
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61 |
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62 | pushfl
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63 | movw %sp, %bx
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64 | orw $0x200, (%bx)
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65 | popfl
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66 |
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67 | pushfl
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68 | popl %edx
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69 | movb $0xff, %ah
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70 | int $0x21
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71 |
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72 | movb $0x00, %ah
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73 | int $0x21
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74 |
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75 | int90_test:
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76 | pushf
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77 | pop %dx
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78 | movb $0xff, %ah
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79 | int $0x21
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80 |
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81 | movw %sp, %bx
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82 | movw 4(%bx), %dx
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83 | movb $0xff, %ah
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84 | int $0x21
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85 |
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86 | movw $GET_OFFSET(int90_msg), %dx
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87 | movb $0x09, %ah
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88 | int $0x21
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89 | iret
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90 |
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91 | int90_msg:
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92 | .string "INT90 started\n$"
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93 |
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94 | hello_world:
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95 | .string "Hello VM86 world\n$"
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96 |
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97 | IF_msg:
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98 | .string "VM86 IF test\n$"
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99 |
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100 | IF_msg1:
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101 | .string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
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102 |
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103 | vm86_code_end:
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104 |
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