The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
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曹家大院的第一代主人叫曹致远。他清末在京城谋生,后来自创商号“公利和鼻烟庄”,在家乡建有票号和商号,生意做得风生水起。曹致远育有三子,1929年开建这座曹家大院。现存大院依稀留有原规模,一排七孔外挂青砖窑洞,三院独分,又有倚门相连,占地上千平方米。