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/psp-sev.h
/*
 * Userspace interface for AMD Secure Encrypted Virtualization (SEV)
 * platform management commands.
 *
 * Copyright (C) 2016-2017 Advanced Micro Devices, Inc.
 *
 * Author: Brijesh Singh <brijesh.singh@amd.com>
 *
 * SEV API specification is available at: https://developer.amd.com/sev/
 *
 * 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 __PSP_SEV_USER_H__
#define __PSP_SEV_USER_H__

#include <linux/types.h>

/**
 * SEV platform commands
 */
enum {
	SEV_FACTORY_RESET = 0,
	SEV_PLATFORM_STATUS,
	SEV_PEK_GEN,
	SEV_PEK_CSR,
	SEV_PDH_GEN,
	SEV_PDH_CERT_EXPORT,
	SEV_PEK_CERT_IMPORT,
	SEV_GET_ID,	/* This command is deprecated, use SEV_GET_ID2 */
	SEV_GET_ID2,

	SEV_MAX,
};

/**
 * SEV Firmware status code
 */
typedef enum {
	/*
	 * This error code is not in the SEV spec. Its purpose is to convey that
	 * there was an error that prevented the SEV firmware from being called.
	 * The SEV API error codes are 16 bits, so the -1 value will not overlap
	 * with possible values from the specification.
	 */
	SEV_RET_NO_FW_CALL = -1,
	SEV_RET_SUCCESS = 0,
	SEV_RET_INVALID_PLATFORM_STATE,
	SEV_RET_INVALID_GUEST_STATE,
	SEV_RET_INAVLID_CONFIG,
	SEV_RET_INVALID_LEN,
	SEV_RET_ALREADY_OWNED,
	SEV_RET_INVALID_CERTIFICATE,
	SEV_RET_POLICY_FAILURE,
	SEV_RET_INACTIVE,
	SEV_RET_INVALID_ADDRESS,
	SEV_RET_BAD_SIGNATURE,
	SEV_RET_BAD_MEASUREMENT,
	SEV_RET_ASID_OWNED,
	SEV_RET_INVALID_ASID,
	SEV_RET_WBINVD_REQUIRED,
	SEV_RET_DFFLUSH_REQUIRED,
	SEV_RET_INVALID_GUEST,
	SEV_RET_INVALID_COMMAND,
	SEV_RET_ACTIVE,
	SEV_RET_HWSEV_RET_PLATFORM,
	SEV_RET_HWSEV_RET_UNSAFE,
	SEV_RET_UNSUPPORTED,
	SEV_RET_INVALID_PARAM,
	SEV_RET_RESOURCE_LIMIT,
	SEV_RET_SECURE_DATA_INVALID,
	SEV_RET_MAX,
} sev_ret_code;

/**
 * struct sev_user_data_status - PLATFORM_STATUS command parameters
 *
 * @major: major API version
 * @minor: minor API version
 * @state: platform state
 * @flags: platform config flags
 * @build: firmware build id for API version
 * @guest_count: number of active guests
 */
struct sev_user_data_status {
	__u8 api_major;				/* Out */
	__u8 api_minor;				/* Out */
	__u8 state;				/* Out */
	__u32 flags;				/* Out */
	__u8 build;				/* Out */
	__u32 guest_count;			/* Out */
} __attribute__((packed));

#define SEV_STATUS_FLAGS_CONFIG_ES	0x0100

/**
 * struct sev_user_data_pek_csr - PEK_CSR command parameters
 *
 * @address: PEK certificate chain
 * @length: length of certificate
 */
struct sev_user_data_pek_csr {
	__u64 address;				/* In */
	__u32 length;				/* In/Out */
} __attribute__((packed));

/**
 * struct sev_user_data_cert_import - PEK_CERT_IMPORT command parameters
 *
 * @pek_address: PEK certificate chain
 * @pek_len: length of PEK certificate
 * @oca_address: OCA certificate chain
 * @oca_len: length of OCA certificate
 */
struct sev_user_data_pek_cert_import {
	__u64 pek_cert_address;			/* In */
	__u32 pek_cert_len;			/* In */
	__u64 oca_cert_address;			/* In */
	__u32 oca_cert_len;			/* In */
} __attribute__((packed));

/**
 * struct sev_user_data_pdh_cert_export - PDH_CERT_EXPORT command parameters
 *
 * @pdh_address: PDH certificate address
 * @pdh_len: length of PDH certificate
 * @cert_chain_address: PDH certificate chain
 * @cert_chain_len: length of PDH certificate chain
 */
struct sev_user_data_pdh_cert_export {
	__u64 pdh_cert_address;			/* In */
	__u32 pdh_cert_len;			/* In/Out */
	__u64 cert_chain_address;		/* In */
	__u32 cert_chain_len;			/* In/Out */
} __attribute__((packed));

/**
 * struct sev_user_data_get_id - GET_ID command parameters (deprecated)
 *
 * @socket1: Buffer to pass unique ID of first socket
 * @socket2: Buffer to pass unique ID of second socket
 */
struct sev_user_data_get_id {
	__u8 socket1[64];			/* Out */
	__u8 socket2[64];			/* Out */
} __attribute__((packed));

/**
 * struct sev_user_data_get_id2 - GET_ID command parameters
 * @address: Buffer to store unique ID
 * @length: length of the unique ID
 */
struct sev_user_data_get_id2 {
	__u64 address;				/* In */
	__u32 length;				/* In/Out */
} __attribute__((packed));

/**
 * struct sev_issue_cmd - SEV ioctl parameters
 *
 * @cmd: SEV commands to execute
 * @opaque: pointer to the command structure
 * @error: SEV FW return code on failure
 */
struct sev_issue_cmd {
	__u32 cmd;				/* In */
	__u64 data;				/* In */
	__u32 error;				/* Out */
} __attribute__((packed));

#define SEV_IOC_TYPE		'S'
#define SEV_ISSUE_CMD	_IOWR(SEV_IOC_TYPE, 0x0, struct sev_issue_cmd)

#endif /* __PSP_USER_SEV_H */

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