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/mmtimer.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Intel Multimedia Timer device interface
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All rights reserved.
 *
 * This file should define an interface compatible with the IA-PC Multimedia
 * Timers Draft Specification (rev. 0.97) from Intel.  Note that some
 * hardware may not be able to safely export its registers to userspace,
 * so the ioctl interface should support all necessary functionality.
 *
 * 11/01/01 - jbarnes - initial revision
 * 9/10/04 - Christoph Lameter - remove interrupt support
 * 9/17/04 - jbarnes - remove test program, move some #defines to the driver
 */

#ifndef _LINUX_MMTIMER_H
#define _LINUX_MMTIMER_H

/*
 * Breakdown of the ioctl's available.  An 'optional' next to the command
 * indicates that supporting this command is optional, while 'required'
 * commands must be implemented if conformance is desired.
 *
 * MMTIMER_GETOFFSET - optional
 *   Should return the offset (relative to the start of the page where the
 *   registers are mapped) for the counter in question.
 *
 * MMTIMER_GETRES - required
 *   The resolution of the clock in femto (10^-15) seconds
 *
 * MMTIMER_GETFREQ - required
 *   Frequency of the clock in Hz
 *
 * MMTIMER_GETBITS - required
 *   Number of bits in the clock's counter
 *
 * MMTIMER_MMAPAVAIL - required
 *   Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
 *
 * MMTIMER_GETCOUNTER - required
 *   Gets the current value in the counter
 */
#define MMTIMER_IOCTL_BASE 'm'

#define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
#define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
#define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
#define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
#define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
#define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)

#endif /* _LINUX_MMTIMER_H */

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