公安机关应当将传唤的原因和依据告知被传唤人。对无正当理由不接受传唤或者逃避传唤的人，经公安机关办案部门负责人批准，可以强制传唤。
（四）在铁路、城市轨道交通线路上私设道口或者平交过道的。
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Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.
The optimization treadmill
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