Segmentation maps a logical address (a 16-bit selector plus a 32-bit offset) to a 32-bit linear address, enforcing privilege and limit checks along the way. Paging then translates that linear address to a physical address, adding a second layer of User/Supervisor and Read/Write protection. The two layers are independent: segmentation is always active in protected mode, while paging is optional (controlled by CR0.PG).
union alloc_header *h = x;h--;。关于这个话题，WPS官方版本下载提供了深入分析
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县城有种在失序中令人心安的感觉。大城市日新月异，农村人越来越少，仿佛只有县城，还保留着旧日的底色和新时代的光辉。