2003-05-16 15:43:31 +02:00
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.code16
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.globl vm86_code_start
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.globl vm86_code_end
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#define GET_OFFSET(x) ((x) - vm86_code_start + 0x100)
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vm86_code_start:
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movw $GET_OFFSET(hello_world), %dx
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movb $0x09, %ah
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int $0x21
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/* prepare int 0x90 vector */
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xorw %ax, %ax
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movw %ax, %es
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es movw $GET_OFFSET(int90_test), 0x90 * 4
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es movw %cs, 0x90 * 4 + 2
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2007-09-17 10:09:54 +02:00
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2003-05-16 15:43:31 +02:00
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/* launch int 0x90 */
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int $0x90
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/* test IF support */
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movw $GET_OFFSET(IF_msg), %dx
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movb $0x09, %ah
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int $0x21
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2007-09-16 23:08:06 +02:00
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pushf
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2003-05-16 15:43:31 +02:00
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popw %dx
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movb $0xff, %ah
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int $0x21
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cli
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2007-09-16 23:08:06 +02:00
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pushf
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2003-05-16 15:43:31 +02:00
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popw %dx
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movb $0xff, %ah
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int $0x21
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2007-09-17 10:09:54 +02:00
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sti
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2007-09-16 23:08:06 +02:00
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pushfl
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2003-05-16 15:43:31 +02:00
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popl %edx
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movb $0xff, %ah
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int $0x21
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2007-09-17 10:09:54 +02:00
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2003-05-16 15:43:31 +02:00
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#if 0
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movw $GET_OFFSET(IF_msg1), %dx
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movb $0x09, %ah
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int $0x21
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pushf
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movw %sp, %bx
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andw $~0x200, (%bx)
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popf
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#else
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cli
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#endif
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2007-09-16 23:08:06 +02:00
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pushf
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2003-05-16 15:43:31 +02:00
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popw %dx
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movb $0xff, %ah
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int $0x21
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2007-09-17 10:09:54 +02:00
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2003-05-16 15:43:31 +02:00
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pushfl
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movw %sp, %bx
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orw $0x200, (%bx)
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popfl
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pushfl
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popl %edx
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movb $0xff, %ah
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int $0x21
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movb $0x00, %ah
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int $0x21
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int90_test:
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2007-09-16 23:08:06 +02:00
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pushf
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2003-05-16 15:43:31 +02:00
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pop %dx
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movb $0xff, %ah
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int $0x21
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movw %sp, %bx
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movw 4(%bx), %dx
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movb $0xff, %ah
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int $0x21
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2007-09-17 10:09:54 +02:00
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2003-05-16 15:43:31 +02:00
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movw $GET_OFFSET(int90_msg), %dx
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movb $0x09, %ah
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int $0x21
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iret
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2007-09-17 10:09:54 +02:00
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2003-05-16 15:43:31 +02:00
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int90_msg:
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.string "INT90 started\n$"
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2007-09-16 23:08:06 +02:00
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2003-05-16 15:43:31 +02:00
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hello_world:
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.string "Hello VM86 world\n$"
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IF_msg:
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.string "VM86 IF test\n$"
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IF_msg1:
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.string "If you see a diff here, your Linux kernel is buggy, please update to 2.4.20 kernel\n$"
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vm86_code_end:
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