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/stm.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * System Trace Module (STM) userspace interfaces
 * Copyright (c) 2014, Intel Corporation.
 *
 * STM class implements generic infrastructure for  System Trace Module devices
 * as defined in MIPI STPv2 specification.
 */

#ifndef _LINUX_STM_H
#define _LINUX_STM_H

#include <linux/types.h>

/* Maximum allowed master and channel values */
#define STP_MASTER_MAX	0xffff
#define STP_CHANNEL_MAX	0xffff

/**
 * struct stp_policy_id - identification for the STP policy
 * @size:	size of the structure including real id[] length
 * @master:	assigned master
 * @channel:	first assigned channel
 * @width:	number of requested channels
 * @id:		identification string
 *
 * User must calculate the total size of the structure and put it into
 * @size field, fill out the @id and desired @width. In return, kernel
 * fills out @master, @channel and @width.
 */
struct stp_policy_id {
	__u32		size;
	__u16		master;
	__u16		channel;
	__u16		width;
	/* padding */
	__u16		__reserved_0;
	__u32		__reserved_1;
	char		id[0];
};

#define STP_POLICY_ID_SET	_IOWR('%', 0, struct stp_policy_id)
#define STP_POLICY_ID_GET	_IOR('%', 1, struct stp_policy_id)
#define STP_SET_OPTIONS		_IOW('%', 2, __u64)

#endif /* _LINUX_STM_H */

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