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 Beast in Me/Netflix
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Александра Синицына (Ночной линейный редактор)
第八十四条 有下列行为之一的，处十日以上十五日以下拘留，可以并处三千元以下罚款；情节较轻的，处五日以下拘留或者一千元以下罚款：