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　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。 . Prv8 Shell

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Current File : //usr/include/linux/mic_ioctl.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * Copyright(c) 2013 Intel Corporation.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Intel MIC Host driver.
 *
 */
#ifndef _MIC_IOCTL_H_
#define _MIC_IOCTL_H_

#include <linux/types.h>

/*
 * mic_copy - MIC virtio descriptor copy.
 *
 * @iov: An array of IOVEC structures containing user space buffers.
 * @iovcnt: Number of IOVEC structures in iov.
 * @vr_idx: The vring index.
 * @update_used: A non zero value results in used index being updated.
 * @out_len: The aggregate of the total length written to or read from
 *	the virtio device.
 */
struct mic_copy_desc {
	struct iovec *iov;
	__u32 iovcnt;
	__u8 vr_idx;
	__u8 update_used;
	__u32 out_len;
};

/*
 * Add a new virtio device
 * The (struct mic_device_desc *) pointer points to a device page entry
 *	for the virtio device consisting of:
 *	- struct mic_device_desc
 *	- struct mic_vqconfig (num_vq of these)
 *	- host and guest features
 *	- virtio device config space
 * The total size referenced by the pointer should equal the size returned
 * by desc_size() in mic_common.h
 */
#define MIC_VIRTIO_ADD_DEVICE _IOWR('s', 1, struct mic_device_desc *)

/*
 * Copy the number of entries in the iovec and update the used index
 * if requested by the user.
 */
#define MIC_VIRTIO_COPY_DESC	_IOWR('s', 2, struct mic_copy_desc *)

/*
 * Notify virtio device of a config change
 * The (__u8 *) pointer points to config space values for the device
 * as they should be written into the device page. The total size
 * referenced by the pointer should equal the config_len field of struct
 * mic_device_desc.
 */
#define MIC_VIRTIO_CONFIG_CHANGE _IOWR('s', 5, __u8 *)

#endif

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