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/wmi.h
/*
 *  User API methods for ACPI-WMI mapping driver
 *
 *  Copyright (C) 2017 Dell, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#ifndef _LINUX_WMI_H
#define _LINUX_WMI_H

#include <linux/ioctl.h>
#include <linux/types.h>

/* WMI bus will filter all WMI vendor driver requests through this IOC */
#define WMI_IOC 'W'

/* All ioctl requests through WMI should declare their size followed by
 * relevant data objects
 */
struct wmi_ioctl_buffer {
	__u64	length;
	__u8	data[];
};

/* This structure may be modified by the firmware when we enter
 * system management mode through SMM, hence the volatiles
 */
struct calling_interface_buffer {
	__u16 cmd_class;
	__u16 cmd_select;
	__volatile__ __u32 input[4];
	__volatile__ __u32 output[4];
} __attribute__((packed));

struct dell_wmi_extensions {
	__u32 argattrib;
	__u32 blength;
	__u8 data[];
} __attribute__((packed));

struct dell_wmi_smbios_buffer {
	__u64 length;
	struct calling_interface_buffer std;
	struct dell_wmi_extensions	ext;
} __attribute__((packed));

/* Whitelisted smbios class/select commands */
#define CLASS_TOKEN_READ	0
#define CLASS_TOKEN_WRITE	1
#define SELECT_TOKEN_STD	0
#define SELECT_TOKEN_BAT	1
#define SELECT_TOKEN_AC		2
#define CLASS_FLASH_INTERFACE	7
#define SELECT_FLASH_INTERFACE	3
#define CLASS_ADMIN_PROP	10
#define SELECT_ADMIN_PROP	3
#define CLASS_INFO		17
#define SELECT_RFKILL		11
#define SELECT_APP_REGISTRATION	3
#define SELECT_DOCK		22

/* whitelisted tokens */
#define CAPSULE_EN_TOKEN	0x0461
#define CAPSULE_DIS_TOKEN	0x0462
#define WSMT_EN_TOKEN		0x04EC
#define WSMT_DIS_TOKEN		0x04ED

/* Dell SMBIOS calling IOCTL command used by dell-smbios-wmi */
#define DELL_WMI_SMBIOS_CMD	_IOWR(WMI_IOC, 0, struct dell_wmi_smbios_buffer)

#endif

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