| 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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