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/sound/sof/fw.h
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * Copyright(c) 2018 Intel Corporation. All rights reserved.
 */

/*
 * Firmware file format .
 */

#ifndef __INCLUDE_UAPI_SOF_FW_H__
#define __INCLUDE_UAPI_SOF_FW_H__

#include <linux/types.h>

#define SND_SOF_FW_SIG_SIZE	4
#define SND_SOF_FW_ABI		1
#define SND_SOF_FW_SIG		"Reef"

/*
 * Firmware module is made up of 1 . N blocks of different types. The
 * Block header is used to determine where and how block is to be copied in the
 * DSP/host memory space.
 */
enum snd_sof_fw_blk_type {
	SOF_FW_BLK_TYPE_INVALID	= -1,
	SOF_FW_BLK_TYPE_START	= 0,
	SOF_FW_BLK_TYPE_RSRVD0	= SOF_FW_BLK_TYPE_START,
	SOF_FW_BLK_TYPE_IRAM	= 1,	/* local instruction RAM */
	SOF_FW_BLK_TYPE_DRAM	= 2,	/* local data RAM */
	SOF_FW_BLK_TYPE_SRAM	= 3,	/* system RAM */
	SOF_FW_BLK_TYPE_ROM	= 4,
	SOF_FW_BLK_TYPE_IMR	= 5,
	SOF_FW_BLK_TYPE_RSRVD6	= 6,
	SOF_FW_BLK_TYPE_RSRVD7	= 7,
	SOF_FW_BLK_TYPE_RSRVD8	= 8,
	SOF_FW_BLK_TYPE_RSRVD9	= 9,
	SOF_FW_BLK_TYPE_RSRVD10	= 10,
	SOF_FW_BLK_TYPE_RSRVD11	= 11,
	SOF_FW_BLK_TYPE_RSRVD12	= 12,
	SOF_FW_BLK_TYPE_RSRVD13	= 13,
	SOF_FW_BLK_TYPE_RSRVD14	= 14,
	/* use SOF_FW_BLK_TYPE_RSVRDX for new block types */
	SOF_FW_BLK_TYPE_NUM
};

struct snd_sof_blk_hdr {
	enum snd_sof_fw_blk_type type;
	__u32 size;		/* bytes minus this header */
	__u32 offset;		/* offset from base */
} __attribute__((packed));

/*
 * Firmware file is made up of 1 .. N different modules types. The module
 * type is used to determine how to load and parse the module.
 */
enum snd_sof_fw_mod_type {
	SOF_FW_BASE	= 0,	/* base firmware image */
	SOF_FW_MODULE	= 1,	/* firmware module */
};

struct snd_sof_mod_hdr {
	enum snd_sof_fw_mod_type type;
	__u32 size;		/* bytes minus this header */
	__u32 num_blocks;	/* number of blocks */
} __attribute__((packed));

/*
 * Firmware file header.
 */
struct snd_sof_fw_header {
	unsigned char sig[SND_SOF_FW_SIG_SIZE]; /* "Reef" */
	__u32 file_size;	/* size of file minus this header */
	__u32 num_modules;	/* number of modules */
	__u32 abi;		/* version of header format */
} __attribute__((packed));

#endif

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