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/vfio_zdev.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * VFIO Region definitions for ZPCI devices
 *
 * Copyright IBM Corp. 2020
 *
 * Author(s): Pierre Morel <pmorel@linux.ibm.com>
 *            Matthew Rosato <mjrosato@linux.ibm.com>
 */

#ifndef _VFIO_ZDEV_H_
#define _VFIO_ZDEV_H_

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

/**
 * VFIO_DEVICE_INFO_CAP_ZPCI_BASE - Base PCI Function information
 *
 * This capability provides a set of descriptive information about the
 * associated PCI function.
 */
struct vfio_device_info_cap_zpci_base {
	struct vfio_info_cap_header header;
	__u64 start_dma;	/* Start of available DMA addresses */
	__u64 end_dma;		/* End of available DMA addresses */
	__u16 pchid;		/* Physical Channel ID */
	__u16 vfn;		/* Virtual function number */
	__u16 fmb_length;	/* Measurement Block Length (in bytes) */
	__u8 pft;		/* PCI Function Type */
	__u8 gid;		/* PCI function group ID */
	/* End of version 1 */
	__u32 fh;		/* PCI function handle */
	/* End of version 2 */
};

/**
 * VFIO_DEVICE_INFO_CAP_ZPCI_GROUP - Base PCI Function Group information
 *
 * This capability provides a set of descriptive information about the group of
 * PCI functions that the associated device belongs to.
 */
struct vfio_device_info_cap_zpci_group {
	struct vfio_info_cap_header header;
	__u64 dasm;		/* DMA Address space mask */
	__u64 msi_addr;		/* MSI address */
	__u64 flags;
#define VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH 1 /* Program-specified TLB refresh */
	__u16 mui;		/* Measurement Block Update Interval */
	__u16 noi;		/* Maximum number of MSIs */
	__u16 maxstbl;		/* Maximum Store Block Length */
	__u8 version;		/* Supported PCI Version */
	/* End of version 1 */
	__u8 reserved;
	__u16 imaxstbl;		/* Maximum Interpreted Store Block Length */
	/* End of version 2 */
};

/**
 * VFIO_DEVICE_INFO_CAP_ZPCI_UTIL - Utility String
 *
 * This capability provides the utility string for the associated device, which
 * is a device identifier string made up of EBCDID characters.  'size' specifies
 * the length of 'util_str'.
 */
struct vfio_device_info_cap_zpci_util {
	struct vfio_info_cap_header header;
	__u32 size;
	__u8 util_str[];
};

/**
 * VFIO_DEVICE_INFO_CAP_ZPCI_PFIP - PCI Function Path
 *
 * This capability provides the PCI function path string, which is an identifier
 * that describes the internal hardware path of the device. 'size' specifies
 * the length of 'pfip'.
 */
struct vfio_device_info_cap_zpci_pfip {
	struct vfio_info_cap_header header;
	__u32 size;
	__u8 pfip[];
};

#endif

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