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return (PAGESZ - sizeof(struct page_info)) / sizes[classno];
，这一点在im钱包官方下载中也有详细论述
Nearly every protection-related instruction -- far CALL, far JMP, far RET, INT, IRET, MOV to segment register, task switch -- needs to load a segment descriptor from the GDT or LDT. The 386 microcode centralizes this into a shared subroutine called LD_DESCRIPTOR, which reads the 8-byte descriptor from memory and feeds the high DWORD (containing Type, DPL, S, and P bits) to the Test PLA for validation.
這可能會降低去年特朗普宣布大規模「解放日」關稅時所造成的經濟動盪，也讓其他國家有更多時間準備回應。
Cheyenne MacDonald for Engadget