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