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 : //usr/include/linux/screen_info.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _SCREEN_INFO_H
#define _SCREEN_INFO_H

#include <linux/types.h>

/*
 * These are set up by the setup-routine at boot-time:
 */

struct screen_info {
	__u8  orig_x;		/* 0x00 */
	__u8  orig_y;		/* 0x01 */
	__u16 ext_mem_k;	/* 0x02 */
	__u16 orig_video_page;	/* 0x04 */
	__u8  orig_video_mode;	/* 0x06 */
	__u8  orig_video_cols;	/* 0x07 */
	__u8  flags;		/* 0x08 */
	__u8  unused2;		/* 0x09 */
	__u16 orig_video_ega_bx;/* 0x0a */
	__u16 unused3;		/* 0x0c */
	__u8  orig_video_lines;	/* 0x0e */
	__u8  orig_video_isVGA;	/* 0x0f */
	__u16 orig_video_points;/* 0x10 */

	/* VESA graphic mode -- linear frame buffer */
	__u16 lfb_width;	/* 0x12 */
	__u16 lfb_height;	/* 0x14 */
	__u16 lfb_depth;	/* 0x16 */
	__u32 lfb_base;		/* 0x18 */
	__u32 lfb_size;		/* 0x1c */
	__u16 cl_magic, cl_offset; /* 0x20 */
	__u16 lfb_linelength;	/* 0x24 */
	__u8  red_size;		/* 0x26 */
	__u8  red_pos;		/* 0x27 */
	__u8  green_size;	/* 0x28 */
	__u8  green_pos;	/* 0x29 */
	__u8  blue_size;	/* 0x2a */
	__u8  blue_pos;		/* 0x2b */
	__u8  rsvd_size;	/* 0x2c */
	__u8  rsvd_pos;		/* 0x2d */
	__u16 vesapm_seg;	/* 0x2e */
	__u16 vesapm_off;	/* 0x30 */
	__u16 pages;		/* 0x32 */
	__u16 vesa_attributes;	/* 0x34 */
	__u32 capabilities;     /* 0x36 */
	__u32 ext_lfb_base;	/* 0x3a */
	__u8  _reserved[2];	/* 0x3e */
} __attribute__((packed));

#define VIDEO_TYPE_MDA		0x10	/* Monochrome Text Display	*/
#define VIDEO_TYPE_CGA		0x11	/* CGA Display 			*/
#define VIDEO_TYPE_EGAM		0x20	/* EGA/VGA in Monochrome Mode	*/
#define VIDEO_TYPE_EGAC		0x21	/* EGA in Color Mode		*/
#define VIDEO_TYPE_VGAC		0x22	/* VGA+ in Color Mode		*/
#define VIDEO_TYPE_VLFB		0x23	/* VESA VGA in graphic mode	*/

#define VIDEO_TYPE_PICA_S3	0x30	/* ACER PICA-61 local S3 video	*/
#define VIDEO_TYPE_MIPS_G364	0x31    /* MIPS Magnum 4000 G364 video  */
#define VIDEO_TYPE_SGI          0x33    /* Various SGI graphics hardware */

#define VIDEO_TYPE_TGAC		0x40	/* DEC TGA */

#define VIDEO_TYPE_SUN          0x50    /* Sun frame buffer. */
#define VIDEO_TYPE_SUNPCI       0x51    /* Sun PCI based frame buffer. */

#define VIDEO_TYPE_PMAC		0x60	/* PowerMacintosh frame buffer. */

#define VIDEO_TYPE_EFI		0x70	/* EFI graphic mode		*/

#define VIDEO_FLAGS_NOCURSOR	(1 << 0) /* The video mode has no cursor set */

#define VIDEO_CAPABILITY_SKIP_QUIRKS	(1 << 0)
#define VIDEO_CAPABILITY_64BIT_BASE	(1 << 1)	/* Frame buffer base is 64-bit */

#endif /* _SCREEN_INFO_H */

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