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/sed-opal.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Copyright © 2016 Intel Corporation
 *
 * Authors:
 *    Rafael Antognolli <rafael.antognolli@intel.com>
 *    Scott  Bauer      <scott.bauer@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 */

#ifndef _SED_OPAL_H
#define _SED_OPAL_H

#include <linux/types.h>

#define OPAL_KEY_MAX 256
#define OPAL_MAX_LRS 9

enum opal_mbr {
	OPAL_MBR_ENABLE = 0x0,
	OPAL_MBR_DISABLE = 0x01,
};

enum opal_user {
	OPAL_ADMIN1 = 0x0,
	OPAL_USER1 = 0x01,
	OPAL_USER2 = 0x02,
	OPAL_USER3 = 0x03,
	OPAL_USER4 = 0x04,
	OPAL_USER5 = 0x05,
	OPAL_USER6 = 0x06,
	OPAL_USER7 = 0x07,
	OPAL_USER8 = 0x08,
	OPAL_USER9 = 0x09,
};

enum opal_lock_state {
	OPAL_RO = 0x01, /* 0001 */
	OPAL_RW = 0x02, /* 0010 */
	OPAL_LK = 0x04, /* 0100 */
};

struct opal_key {
	__u8 lr;
	__u8 key_len;
	__u8 __align[6];
	__u8 key[OPAL_KEY_MAX];
};

struct opal_lr_act {
	struct opal_key key;
	__u32 sum;
	__u8    num_lrs;
	__u8 lr[OPAL_MAX_LRS];
	__u8 align[2]; /* Align to 8 byte boundary */
};

struct opal_session_info {
	__u32 sum;
	__u32 who;
	struct opal_key opal_key;
};

struct opal_user_lr_setup {
	__u64 range_start;
	__u64 range_length;
	__u32 RLE; /* Read Lock enabled */
	__u32 WLE; /* Write Lock Enabled */
	struct opal_session_info session;
};

struct opal_lock_unlock {
	struct opal_session_info session;
	__u32 l_state;
	__u8 __align[4];
};

struct opal_new_pw {
	struct opal_session_info session;

	/* When we're not operating in sum, and we first set
	 * passwords we need to set them via ADMIN authority.
	 * After passwords are changed, we can set them via,
	 * User authorities.
	 * Because of this restriction we need to know about
	 * Two different users. One in 'session' which we will use
	 * to start the session and new_userr_pw as the user we're
	 * chaning the pw for.
	 */
	struct opal_session_info new_user_pw;
};

struct opal_mbr_data {
	struct opal_key key;
	__u8 enable_disable;
	__u8 __align[7];
};

#define IOC_OPAL_SAVE		    _IOW('p', 220, struct opal_lock_unlock)
#define IOC_OPAL_LOCK_UNLOCK	    _IOW('p', 221, struct opal_lock_unlock)
#define IOC_OPAL_TAKE_OWNERSHIP	    _IOW('p', 222, struct opal_key)
#define IOC_OPAL_ACTIVATE_LSP       _IOW('p', 223, struct opal_lr_act)
#define IOC_OPAL_SET_PW             _IOW('p', 224, struct opal_new_pw)
#define IOC_OPAL_ACTIVATE_USR       _IOW('p', 225, struct opal_session_info)
#define IOC_OPAL_REVERT_TPR         _IOW('p', 226, struct opal_key)
#define IOC_OPAL_LR_SETUP           _IOW('p', 227, struct opal_user_lr_setup)
#define IOC_OPAL_ADD_USR_TO_LR      _IOW('p', 228, struct opal_lock_unlock)
#define IOC_OPAL_ENABLE_DISABLE_MBR _IOW('p', 229, struct opal_mbr_data)
#define IOC_OPAL_ERASE_LR           _IOW('p', 230, struct opal_session_info)
#define IOC_OPAL_SECURE_ERASE_LR    _IOW('p', 231, struct opal_session_info)

#endif /* _SED_OPAL_H */

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