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When the I/O privilege level (IOPL) is less than 3 in virtual-8086 mode, the PUSHF/PUSHFD
instructions causes a general protection exception (#GP). The IOPL is altered only when
executing at privilege level 0. The interrupt flag is altered only when executing at a level at least
as privileged as the IOPL. (Real-address mode is equivalent to privilege level 0.) If a
PUSHF/PUSHFD instruction is executed with insufficient privilege, an exception does not
occur, but the privileged bits do not change.
Так что при желании операционка туфту может подсунуть ;)
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