晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/self/root/usr/include/asm/ldt.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * ldt.h
 *
 * Definitions of structures used with the modify_ldt system call.
 */
#ifndef _ASM_X86_LDT_H
#define _ASM_X86_LDT_H

/* Maximum number of LDT entries supported. */
#define LDT_ENTRIES	8192
/* The size of each LDT entry. */
#define LDT_ENTRY_SIZE	8

#ifndef __ASSEMBLY__
/*
 * Note on 64bit base and limit is ignored and you cannot set DS/ES/CS
 * not to the default values if you still want to do syscalls. This
 * call is more for 32bit mode therefore.
 */
struct user_desc {
	unsigned int  entry_number;
	unsigned int  base_addr;
	unsigned int  limit;
	unsigned int  seg_32bit:1;
	unsigned int  contents:2;
	unsigned int  read_exec_only:1;
	unsigned int  limit_in_pages:1;
	unsigned int  seg_not_present:1;
	unsigned int  useable:1;
#ifdef __x86_64__
	/*
	 * Because this bit is not present in 32-bit user code, user
	 * programs can pass uninitialized values here.  Therefore, in
	 * any context in which a user_desc comes from a 32-bit program,
	 * the kernel must act as though lm == 0, regardless of the
	 * actual value.
	 */
	unsigned int  lm:1;
#endif
};

#define MODIFY_LDT_CONTENTS_DATA	0
#define MODIFY_LDT_CONTENTS_STACK	1
#define MODIFY_LDT_CONTENTS_CODE	2

#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_LDT_H */

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