text: #ifndef _LINUX_HDREG_H
  #define _LINUX_HDREG_H
  
  /*
   * This file contains some defines for the AT-hd-controller.
   * Various sources.  
   */
  
  #define HD_IRQ 14			/* the standard disk interrupt */
  
  /* ide.c has its own port definitions in "ide.h" */
  
  /* Hd controller regs. Ref: IBM AT Bios-listing */
  #define HD_DATA		0x1f0		/* _CTL when writing */
  #define HD_ERROR	0x1f1		/* see err-bits */
  #define HD_NSECTOR	0x1f2		/* nr of sectors to read/write */
  #define HD_SECTOR	0x1f3		/* starting sector */
  #define HD_LCYL		0x1f4		/* starting cylinder */
  #define HD_HCYL		0x1f5		/* high byte of starting cyl */
  #define HD_CURRENT	0x1f6		/* 101dhhhh , d=drive, hhhh=head */
  #define HD_STATUS	0x1f7		/* see status-bits */
  #define HD_FEATURE	HD_ERROR	/* same io address, read=error, write=feature */
  #define HD_PRECOMP	HD_FEATURE	/* obsolete use of this port - predates IDE */
  #define HD_COMMAND	HD_STATUS	/* same io address, read=status, write=cmd */
  
  #define HD_CMD		0x3f6		/* used for resets */
  #define HD_ALTSTATUS	0x3f6		/* same as HD_STATUS but doesn't clear irq */
  
  /* remainder is shared between hd.c, ide.c, ide-cd.c, and the hdparm utility */
  
  /* Bits of HD_STATUS */
  #define ERR_STAT		0x01
  #define INDEX_STAT		0x02
  #define ECC_STAT		0x04	/* Corrected error */
  #define DRQ_STAT		0x08
  #define SEEK_STAT		0x10
  #define WRERR_STAT		0x20
  #define READY_STAT		0x40
  #define BUSY_STAT		0x80
  
  /* Bits for HD_ERROR */
  #define MARK_ERR		0x01	/* Bad address mark */
  #define TRK0_ERR		0x02	/* couldn't find track 0 */
  #define ABRT_ERR		0x04	/* Command aborted */
  #define MCR_ERR			0x08	/* media change request */
  #define ID_ERR			0x10	/* ID field not found */
  #define MC_ERR			0x20	/* media changed */
  #define ECC_ERR			0x40	/* Uncorrectable ECC error */
  #define BBD_ERR			0x80	/* pre-EIDE meaning:  block marked bad */
  #define ICRC_ERR		0x80	/* new meaning:  CRC error during transfer */
  
  /*
   * Command Header sizes for IOCTL commands
   *	HDIO_DRIVE_CMD, HDIO_DRIVE_TASK, and HDIO_DRIVE_TASKFILE
   */
  
  typedef unsigned char task_ioreg_t;
  
  #define HDIO_DRIVE_CMD_HDR_SIZE		4*sizeof(task_ioreg_t)
  #define HDIO_DRIVE_TASK_HDR_SIZE	8*sizeof(task_ioreg_t)
  #define HDIO_DRIVE_HOB_HDR_SIZE		8*sizeof(task_ioreg_t)
  
  #define IDE_DRIVE_TASK_INVALID		-1
  #define IDE_DRIVE_TASK_NO_DATA		0
  #define IDE_DRIVE_TASK_SET_XFER		1
  
  #define IDE_DRIVE_TASK_IN		2
  
  #define IDE_DRIVE_TASK_OUT		3
  #define IDE_DRIVE_TASK_RAW_WRITE	4
  
  struct hd_drive_cmd_hdr {
  	task_ioreg_t command;
  	task_ioreg_t sector_number;
  	task_ioreg_t feature;
  	task_ioreg_t sector_count;
  };
  
  typedef struct hd_drive_task_hdr {
  	task_ioreg_t data;
  	task_ioreg_t feature;
  	task_ioreg_t sector_count;
  	task_ioreg_t sector_number;
  	task_ioreg_t low_cylinder;
  	task_ioreg_t high_cylinder;
  	task_ioreg_t device_head;
  	task_ioreg_t command;
  } task_struct_t;
  
  typedef struct hd_drive_hob_hdr {
  	task_ioreg_t data;
  	task_ioreg_t feature;
  	task_ioreg_t sector_count;
  	task_ioreg_t sector_number;
  	task_ioreg_t low_cylinder;
  	task_ioreg_t high_cylinder;
  	task_ioreg_t device_head;
  	task_ioreg_t control;
  } hob_struct_t;
  
  typedef union ide_reg_valid_s {
  	unsigned all				: 16;
  	struct {
  		unsigned data			: 1;
  		unsigned error_feature		: 1;
  		unsigned sector			: 1;
  		unsigned nsector		: 1;
  		unsigned lcyl			: 1;
  		unsigned hcyl			: 1;
  		unsigned select			: 1;
  		unsigned status_command		: 1;
  
  		unsigned data_hob		: 1;
  		unsigned error_feature_hob	: 1;
  		unsigned sector_hob		: 1;
  		unsigned nsector_hob		: 1;
  		unsigned lcyl_hob		: 1;
  		unsigned hcyl_hob		: 1;
  		unsigned select_hob		: 1;
  		unsigned control_hob		: 1;
  	} b;
  } ide_reg_valid_t;
  
  /*
   * Define standard taskfile in/out register
   */
  #define IDE_TASKFILE_STD_OUT_FLAGS	0xFE
  #define IDE_TASKFILE_STD_IN_FLAGS	0xFE
  #define IDE_HOB_STD_OUT_FLAGS		0xC0
  #define IDE_HOB_STD_IN_FLAGS		0xC0
  
  typedef struct ide_task_request_s {
  	task_ioreg_t	io_ports[8];
  	task_ioreg_t	hob_ports[8];
  	ide_reg_valid_t	out_flags;
  	ide_reg_valid_t	in_flags;
  	int		data_phase;
  	int		req_cmd;
  	unsigned long	out_size;
  	unsigned long	in_size;
  } ide_task_request_t;
  
  typedef struct ide_ioctl_request_s {
  	ide_task_request_t	*task_request;
  	unsigned char		*out_buffer;
  	unsigned char		*in_buffer;
  } ide_ioctl_request_t;
  
  #define TASKFILE_INVALID		0x7fff
  #define TASKFILE_48			0x8000
  
  #define TASKFILE_NO_DATA		0x0000
  
  #define TASKFILE_IN			0x0001
  #define TASKFILE_MULTI_IN		0x0002
  
  #define TASKFILE_OUT			0x0004
  #define TASKFILE_MULTI_OUT		0x0008
  #define TASKFILE_IN_OUT			0x0010
  
  #define TASKFILE_IN_DMA			0x0020
  #define TASKFILE_OUT_DMA		0x0040
  #define TASKFILE_IN_DMAQ		0x0080
  #define TASKFILE_OUT_DMAQ		0x0100
  
  #define TASKFILE_P_IN			0x0200
  #define TASKFILE_P_OUT			0x0400
  #define TASKFILE_P_IN_DMA		0x0800
  #define TASKFILE_P_OUT_DMA		0x1000
  #define TASKFILE_P_IN_DMAQ		0x2000
  #define TASKFILE_P_OUT_DMAQ		0x4000
  
  /* ATA/ATAPI Commands pre T13 Spec */
  #define WIN_NOP				0x00
  #define CFA_REQ_EXT_ERROR_CODE		0x03 /* CFA Request Extended Error Code */
  #define WIN_SRST			0x08 /* ATAPI soft reset command */
  #define WIN_DEVICE_RESET		0x08
  #define WIN_RESTORE			0x10
  #define WIN_READ			0x20 /* 28-Bit */
  #define WIN_READ_EXT			0x24 /* 48-Bit */
  #define WIN_READDMA_EXT			0x25 /* 48-Bit */
  #define WIN_READDMA_QUEUED_EXT		0x26 /* 48-Bit */
  #define WIN_READ_NATIVE_MAX_EXT		0x27 /* 48-Bit */
  #define WIN_MULTREAD_EXT		0x29 /* 48-Bit */
  #define WIN_WRITE			0x30 /* 28-Bit */
  #define WIN_WRITE_EXT			0x34 /* 48-Bit */
  #define WIN_WRITEDMA_EXT		0x35 /* 48-Bit */
  #define WIN_WRITEDMA_QUEUED_EXT		0x36 /* 48-Bit */
  #define WIN_SET_MAX_EXT			0x37 /* 48-Bit */
  #define CFA_WRITE_SECT_WO_ERASE		0x38 /* CFA Write Sectors without erase */
  #define WIN_MULTWRITE_EXT		0x39 /* 48-Bit */
  #define WIN_WRITE_VERIFY		0x3C /* 28-Bit */
  #define WIN_VERIFY			0x40 /* 28-Bit - Read Verify Sectors */
  #define WIN_VERIFY_EXT			0x42 /* 48-Bit */
  #define WIN_FORMAT			0x50
  #define WIN_INIT			0x60
  #define WIN_SEEK			0x70
  #define CFA_TRANSLATE_SECTOR		0x87 /* CFA Translate Sector */
  #define WIN_DIAGNOSE			0x90
  #define WIN_SPECIFY			0x91 /* set drive geometry translation */
  #define WIN_DOWNLOAD_MICROCODE		0x92
  #define WIN_STANDBYNOW2			0x94
  #define WIN_SETIDLE2			0x97
  #define WIN_CHECKPOWERMODE2		0x98
  #define WIN_SLEEPNOW2			0x99
  #define WIN_PACKETCMD			0xA0 /* Send a packet command. */
  #define WIN_PIDENTIFY			0xA1 /* identify ATAPI device	*/
  #define WIN_QUEUED_SERVICE		0xA2
  #define WIN_SMART			0xB0 /* self-monitoring and reporting */
  #define CFA_ERASE_SECTORS       	0xC0
  #define WIN_MULTREAD			0xC4 /* read sectors using multiple mode*/
  #define WIN_MULTWRITE			0xC5 /* write sectors using multiple mode */
  #define WIN_SETMULT			0xC6 /* enable/disable multiple mode */
  #define WIN_READDMA_QUEUED		0xC7 /* read sectors using Queued DMA transfers */
  #define WIN_READDMA			0xC8 /* read sectors using DMA transfers */
  #define WIN_WRITEDMA			0xCA /* write sectors using DMA transfers */
  #define WIN_WRITEDMA_QUEUED		0xCC /* write sectors using Queued DMA transfers */
  #define CFA_WRITE_MULTI_WO_ERASE	0xCD /* CFA Write multiple without erase */
  #define WIN_GETMEDIASTATUS		0xDA	
  #define WIN_DOORLOCK			0xDE /* lock door on removable drives */
  #define WIN_DOORUNLOCK			0xDF /* unlock door on removable drives */
  #define WIN_STANDBYNOW1			0xE0
  #define WIN_IDLEIMMEDIATE		0xE1 /* force drive to become "ready" */
  #define WIN_STANDBY             	0xE2 /* Set device in Standby Mode */
  #define WIN_SETIDLE1			0xE3
  #define WIN_READ_BUFFER			0xE4 /* force read only 1 sector */
  #define WIN_CHECKPOWERMODE1		0xE5
  #define WIN_SLEEPNOW1			0xE6
  #define WIN_FLUSH_CACHE			0xE7
  #define WIN_WRITE_BUFFER		0xE8 /* force write only 1 sector */
  #define WIN_FLUSH_CACHE_EXT		0xEA /* 48-Bit */
  #define WIN_IDENTIFY			0xEC /* ask drive to identify itself	*/
  #define WIN_MEDIAEJECT			0xED
  #define WIN_IDENTIFY_DMA		0xEE /* same as WIN_IDENTIFY, but DMA */
  #define WIN_SETFEATURES			0xEF /* set special drive features */
  #define EXABYTE_ENABLE_NEST		0xF0
  #define WIN_SECURITY_SET_PASS		0xF1
  #define WIN_SECURITY_UNLOCK		0xF2
  #define WIN_SECURITY_ERASE_PREPARE	0xF3
  #define WIN_SECURITY_ERASE_UNIT		0xF4
  #define WIN_SECURITY_FREEZE_LOCK	0xF5
  #define WIN_SECURITY_DISABLE		0xF6
  #define WIN_READ_NATIVE_MAX		0xF8 /* return the native maximum address */
  #define WIN_SET_MAX			0xF9
  #define DISABLE_SEAGATE			0xFB
  
  /* WIN_SMART sub-commands */
  
  #define SMART_READ_VALUES		0xD0
  #define SMART_READ_THRESHOLDS		0xD1
  #define SMART_AUTOSAVE			0xD2
  #define SMART_SAVE			0xD3
  #define SMART_IMMEDIATE_OFFLINE		0xD4
  #define SMART_READ_LOG_SECTOR		0xD5
  #define SMART_WRITE_LOG_SECTOR		0xD6
  #define SMART_WRITE_THRESHOLDS		0xD7
  #define SMART_ENABLE			0xD8
  #define SMART_DISABLE			0xD9
  #define SMART_STATUS			0xDA
  #define SMART_AUTO_OFFLINE		0xDB
  
  /* Password used in TF4 & TF5 executing SMART commands */
  
  #define SMART_LCYL_PASS			0x4F
  #define SMART_HCYL_PASS			0xC2
  		
  /* WIN_SETFEATURES sub-commands */
  
  #define SETFEATURES_EN_WCACHE	0x02	/* Enable write cache */
  #define SETFEATURES_XFER	0x03	/* Set transfer mode */
  #	define XFER_UDMA_7	0x47	/* 0100|0111 */
  #	define XFER_UDMA_6	0x46	/* 0100|0110 */
  #	define XFER_UDMA_5	0x45	/* 0100|0101 */
  #	define XFER_UDMA_4	0x44	/* 0100|0100 */
  #	define XFER_UDMA_3	0x43	/* 0100|0011 */
  #	define XFER_UDMA_2	0x42	/* 0100|0010 */
  #	define XFER_UDMA_1	0x41	/* 0100|0001 */
  #	define XFER_UDMA_0	0x40	/* 0100|0000 */
  #	define XFER_MW_DMA_2	0x22	/* 0010|0010 */
  #	define XFER_MW_DMA_1	0x21	/* 0010|0001 */
  #	define XFER_MW_DMA_0	0x20	/* 0010|0000 */
  #	define XFER_SW_DMA_2	0x12	/* 0001|0010 */
  #	define XFER_SW_DMA_1	0x11	/* 0001|0001 */
  #	define XFER_SW_DMA_0	0x10	/* 0001|0000 */
  #	define XFER_PIO_4	0x0C	/* 0000|1100 */
  #	define XFER_PIO_3	0x0B	/* 0000|1011 */
  #	define XFER_PIO_2	0x0A	/* 0000|1010 */
  #	define XFER_PIO_1	0x09	/* 0000|1001 */
  #	define XFER_PIO_0	0x08	/* 0000|1000 */
  #	define XFER_PIO_SLOW	0x00	/* 0000|0000 */
  #define SETFEATURES_DIS_DEFECT	0x04	/* Disable Defect Management */
  #define SETFEATURES_EN_APM	0x05	/* Enable advanced power management */
  #define SETFEATURES_DIS_MSN	0x31	/* Disable Media Status Notification */
  #define SETFEATURES_EN_AAM	0x42	/* Enable Automatic Acoustic Management */
  #define SETFEATURES_DIS_RLA	0x55	/* Disable read look-ahead feature */
  #define SETFEATURES_EN_RI	0x5D	/* Enable release interrupt */
  #define SETFEATURES_EN_SI	0x5E	/* Enable SERVICE interrupt */
  #define SETFEATURES_DIS_RPOD	0x66	/* Disable reverting to power on defaults */
  #define SETFEATURES_DIS_WCACHE	0x82	/* Disable write cache */
  #define SETFEATURES_EN_DEFECT	0x84	/* Enable Defect Management */
  #define SETFEATURES_DIS_APM	0x85	/* Disable advanced power management */
  #define SETFEATURES_EN_MSN	0x95	/* Enable Media Status Notification */
  #define SETFEATURES_EN_RLA	0xAA	/* Enable read look-ahead feature */
  #define SETFEATURES_PREFETCH	0xAB	/* Sets drive prefetch value */
  #define SETFEATURES_DIS_AAM	0xC2	/* Disable Automatic Acoustic Management */
  #define SETFEATURES_EN_RPOD	0xCC	/* Enable reverting to power on defaults */
  #define SETFEATURES_DIS_RI	0xDD	/* Disable release interrupt */
  #define SETFEATURES_DIS_SI	0xDE	/* Disable SERVICE interrupt */
  
  /* WIN_SECURITY sub-commands */
  
  #define SECURITY_SET_PASSWORD		0xBA
  #define SECURITY_UNLOCK			0xBB
  #define SECURITY_ERASE_PREPARE		0xBC
  #define SECURITY_ERASE_UNIT		0xBD
  #define SECURITY_FREEZE_LOCK		0xBE
  #define SECURITY_DISABLE_PASSWORD	0xBF
  
  struct hd_geometry {
        unsigned char heads;
        unsigned char sectors;
        unsigned short cylinders;
        unsigned long start;
  };
  
  /* BIG GEOMETRY */
  struct hd_big_geometry {
  	unsigned char heads;
  	unsigned char sectors;
  	unsigned int cylinders;
  	unsigned long start;
  };
  
  /* hd/ide ctl's that pass (arg) ptrs to user space are numbered 0x030n/0x031n */
  #define HDIO_GETGEO		0x0301	/* get device geometry */
  #define HDIO_GET_UNMASKINTR	0x0302	/* get current unmask setting */
  #define HDIO_GET_MULTCOUNT	0x0304	/* get current IDE blockmode setting */
  #define HDIO_GET_QDMA		0x0305	/* get use-qdma flag */
  #define HDIO_OBSOLETE_IDENTITY	0x0307	/* OBSOLETE, DO NOT USE: returns 142 bytes */
  #define HDIO_GET_KEEPSETTINGS	0x0308	/* get keep-settings-on-reset flag */
  #define HDIO_GET_32BIT		0x0309	/* get current io_32bit setting */
  #define HDIO_GET_NOWERR		0x030a	/* get ignore-write-error flag */
  #define HDIO_GET_DMA		0x030b	/* get use-dma flag */
  #define HDIO_GET_NICE		0x030c	/* get nice flags */
  #define HDIO_GET_IDENTITY	0x030d	/* get IDE identification info */
  #define HDIO_GET_WCACHE		0x030e	/* get write cache mode on|off */
  #define HDIO_GET_ACOUSTIC	0x030f	/* get acoustic value */
  #define	HDIO_GET_ADDRESS	0x0310	/* */
  
  #define HDIO_GET_BUSSTATE	0x031a	/* get the bus state of the hwif */
  #define HDIO_TRISTATE_HWIF	0x031b	/* execute a channel tristate */
  #define HDIO_DRIVE_RESET	0x031c	/* execute a device reset */
  #define HDIO_DRIVE_TASKFILE	0x031d	/* execute raw taskfile */
  #define HDIO_DRIVE_TASK		0x031e	/* execute task and special drive command */
  #define HDIO_DRIVE_CMD		0x031f	/* execute a special drive command */
  
  #define HDIO_DRIVE_CMD_AEB	HDIO_DRIVE_TASK
  
  /* hd/ide ctl's that pass (arg) non-ptr values are numbered 0x032n/0x033n */
  #define HDIO_SET_MULTCOUNT	0x0321	/* change IDE blockmode */
  #define HDIO_SET_UNMASKINTR	0x0322	/* permit other irqs during I/O */
  #define HDIO_SET_KEEPSETTINGS	0x0323	/* keep ioctl settings on reset */
  #define HDIO_SET_32BIT		0x0324	/* change io_32bit flags */
  #define HDIO_SET_NOWERR		0x0325	/* change ignore-write-error flag */
  #define HDIO_SET_DMA		0x0326	/* change use-dma flag */
  #define HDIO_SET_PIO_MODE	0x0327	/* reconfig interface to new speed */
  #define HDIO_SCAN_HWIF		0x0328	/* register and (re)scan interface */
  #define HDIO_SET_NICE		0x0329	/* set nice flags */
  #define HDIO_UNREGISTER_HWIF	0x032a  /* unregister interface */
  #define HDIO_SET_WCACHE		0x032b	/* change write cache enable-disable */
  #define HDIO_SET_ACOUSTIC	0x032c	/* change acoustic behavior */
  #define HDIO_SET_BUSSTATE	0x032d	/* set the bus state of the hwif */
  #define HDIO_SET_QDMA		0x032e	/* change use-qdma flag */
  #define HDIO_SET_ADDRESS	0x032f	/* change lba addressing modes */
  
  /* bus states */
  enum {
  	BUSSTATE_OFF = 0,
  	BUSSTATE_ON,
  	BUSSTATE_TRISTATE
  };
  
  /* hd/ide ctl's that pass (arg) ptrs to user space are numbered 0x033n/0x033n */
  #define HDIO_GETGEO_BIG		0x0330	/* */
  #define HDIO_GETGEO_BIG_RAW	0x0331	/* */
  
  #define __NEW_HD_DRIVE_ID
  /* structure returned by HDIO_GET_IDENTITY,
   * as per ANSI NCITS ATA6 rev.1b spec
   */
  struct hd_driveid {
  	unsigned short	config;		/* lots of obsolete bit flags */
  	unsigned short	cyls;		/* Obsolete, "physical" cyls */
  	unsigned short	reserved2;	/* reserved (word 2) */
  	unsigned short	heads;		/* Obsolete, "physical" heads */
  	unsigned short	track_bytes;	/* unformatted bytes per track */
  	unsigned short	sector_bytes;	/* unformatted bytes per sector */
  	unsigned short	sectors;	/* Obsolete, "physical" sectors per track */
  	unsigned short	vendor0;	/* vendor unique */
  	unsigned short	vendor1;	/* vendor unique */
  	unsigned short	vendor2;	/* Retired vendor unique */
  	unsigned char	serial_no[20];	/* 0 = not_specified */
  	unsigned short	buf_type;	/* Retired */
  	unsigned short	buf_size;	/* Retired, 512 byte increments
  					 * 0 = not_specified
  					 */
  	unsigned short	ecc_bytes;	/* for r/w long cmds; 0 = not_specified */
  	unsigned char	fw_rev[8];	/* 0 = not_specified */
  	unsigned char	model[40];	/* 0 = not_specified */
  	unsigned char	max_multsect;	/* 0=not_implemented */
  	unsigned char	vendor3;	/* vendor unique */
  	unsigned short	dword_io;	/* 0=not_implemented; 1=implemented */
  	unsigned char	vendor4;	/* vendor unique */
  	unsigned char	capability;	/* (upper byte of word 49)
  					 *  3:	IORDYsup
  					 *  2:	IORDYsw
  					 *  1:	LBA
  					 *  0:	DMA
  					 */
  	unsigned short	reserved50;	/* reserved (word 50) */
  	unsigned char	vendor5;	/* Obsolete, vendor unique */
  	unsigned char	tPIO;		/* Obsolete, 0=slow, 1=medium, 2=fast */
  	unsigned char	vendor6;	/* Obsolete, vendor unique */
  	unsigned char	tDMA;		/* Obsolete, 0=slow, 1=medium, 2=fast */
  	unsigned short	field_valid;	/* (word 53)
  					 *  2:	ultra_ok	word  88
  					 *  1:	eide_ok		words 64-70
  					 *  0:	cur_ok		words 54-58
  					 */
  	unsigned short	cur_cyls;	/* Obsolete, logical cylinders */
  	unsigned short	cur_heads;	/* Obsolete, l heads */
  	unsigned short	cur_sectors;	/* Obsolete, l sectors per track */
  	unsigned short	cur_capacity0;	/* Obsolete, l total sectors on drive */
  	unsigned short	cur_capacity1;	/* Obsolete, (2 words, misaligned int)     */
  	unsigned char	multsect;	/* current multiple sector count */
  	unsigned char	multsect_valid;	/* when (bit0==1) multsect is ok */
  	unsigned int	lba_capacity;	/* Obsolete, total number of sectors */
  	unsigned short	dma_1word;	/* Obsolete, single-word dma info */
  	unsigned short	dma_mword;	/* multiple-word dma info */
  	unsigned short  eide_pio_modes; /* bits 0:mode3 1:mode4 */
  	unsigned short  eide_dma_min;	/* min mword dma cycle time (ns) */
  	unsigned short  eide_dma_time;	/* recommended mword dma cycle time (ns) */
  	unsigned short  eide_pio;       /* min cycle time (ns), no IORDY  */
  	unsigned short  eide_pio_iordy; /* min cycle time (ns), with IORDY */
  	unsigned short	words69_70[2];	/* reserved words 69-70
  					 * future command overlap and queuing
  					 */
  	/* HDIO_GET_IDENTITY currently returns only words 0 through 70 */
  	unsigned short	words71_74[4];	/* reserved words 71-74
  					 * for IDENTIFY PACKET DEVICE command
  					 */
  	unsigned short  queue_depth;	/* (word 75)
  					 * 15:5	reserved
  					 *  4:0	Maximum queue depth -1
  					 */
  	unsigned short  words76_79[4];	/* reserved words 76-79 */
  	unsigned short  major_rev_num;	/* (word 80) */
  	unsigned short  minor_rev_num;	/* (word 81) */
  	unsigned short  command_set_1;	/* (word 82) supported
  					 * 15:	Obsolete
  					 * 14:	NOP command
  					 * 13:	READ_BUFFER
  					 * 12:	WRITE_BUFFER
  					 * 11:	Obsolete
  					 * 10:	Host Protected Area
  					 *  9:	DEVICE Reset
  					 *  8:	SERVICE Interrupt
  					 *  7:	Release Interrupt
  					 *  6:	look-ahead
  					 *  5:	write cache
  					 *  4:	PACKET Command
  					 *  3:	Power Management Feature Set
  					 *  2:	Removable Feature Set
  					 *  1:	Security Feature Set
  					 *  0:	SMART Feature Set
  					 */
  	unsigned short  command_set_2;	/* (word 83)
  					 * 15:	Shall be ZERO
  					 * 14:	Shall be ONE
  					 * 13:	FLUSH CACHE EXT
  					 * 12:	FLUSH CACHE
  					 * 11:	Device Configuration Overlay
  					 * 10:	48-bit Address Feature Set
  					 *  9:	Automatic Acoustic Management
  					 *  8:	SET MAX security
  					 *  7:	reserved 1407DT PARTIES
  					 *  6:	SetF sub-command Power-Up
  					 *  5:	Power-Up in Standby Feature Set
  					 *  4:	Removable Media Notification
  					 *  3:	APM Feature Set
  					 *  2:	CFA Feature Set
  					 *  1:	READ/WRITE DMA QUEUED
  					 *  0:	Download MicroCode
  					 */
  	unsigned short  cfsse;		/* (word 84)
  					 * cmd set-feature supported extensions
  					 * 15:	Shall be ZERO
  					 * 14:	Shall be ONE
  					 * 13:3	reserved
  					 *  2:	Media Serial Number Valid
  					 *  1:	SMART selt-test supported
  					 *  0:	SMART error logging
  					 */
  	unsigned short  cfs_enable_1;	/* (word 85)
  					 * command set-feature enabled
  					 * 15:	Obsolete
  					 * 14:	NOP command
  					 * 13:	READ_BUFFER
  					 * 12:	WRITE_BUFFER
  					 * 11:	Obsolete
  					 * 10:	Host Protected Area
  					 *  9:	DEVICE Reset
  					 *  8:	SERVICE Interrupt
  					 *  7:	Release Interrupt
  					 *  6:	look-ahead
  					 *  5:	write cache
  					 *  4:	PACKET Command
  					 *  3:	Power Management Feature Set
  					 *  2:	Removable Feature Set
  					 *  1:	Security Feature Set
  					 *  0:	SMART Feature Set
  					 */
  	unsigned short  cfs_enable_2;	/* (word 86)
  					 * command set-feature enabled
  					 * 15:	Shall be ZERO
  					 * 14:	Shall be ONE
  					 * 13:	FLUSH CACHE EXT
  					 * 12:	FLUSH CACHE
  					 * 11:	Device Configuration Overlay
  					 * 10:	48-bit Address Feature Set
  					 *  9:	Automatic Acoustic Management
  					 *  8:	SET MAX security
  					 *  7:	reserved 1407DT PARTIES
  					 *  6:	SetF sub-command Power-Up
  					 *  5:	Power-Up in Standby Feature Set
  					 *  4:	Removable Media Notification
  					 *  3:	APM Feature Set
  					 *  2:	CFA Feature Set
  					 *  1:	READ/WRITE DMA QUEUED
  					 *  0:	Download MicroCode
  					 */
  	unsigned short  csf_default;	/* (word 87)
  					 * command set-feature default
  					 * 15:	Shall be ZERO
  					 * 14:	Shall be ONE
  					 * 13:3	reserved
  					 *  2:	Media Serial Number Valid
  					 *  1:	SMART selt-test supported
  					 *  0:	SMART error logging
  					 */
  	unsigned short  dma_ultra;	/* (word 88) */
  	unsigned short	word89;		/* reserved (word 89) */
  	unsigned short	word90;		/* reserved (word 90) */
  	unsigned short	CurAPMvalues;	/* current APM values */
  	unsigned short	word92;		/* reserved (word 92) */
  	unsigned short	hw_config;	/* hardware config (word 93)
  					 * 15:
  					 * 14:
  					 * 13:
  					 * 12:
  					 * 11:
  					 * 10:
  					 *  9:
  					 *  8:
  					 *  7:
  					 *  6:
  					 *  5:
  					 *  4:
  					 *  3:
  					 *  2:
  					 *  1:
  					 *  0:
  					 */
  	unsigned short	acoustic;	/* (word 94)
  					 * 15:8	Vendor's recommended value
  					 *  7:0	current value
  					 */
  	unsigned short	words95_99[5];	/* reserved words 95-99 */
  	unsigned long long lba_capacity_2;/* 48-bit total number of sectors */
  	unsigned short	words104_125[22];/* reserved words 104-125 */
  	unsigned short	last_lun;	/* (word 126) */
  	unsigned short	word127;	/* (word 127) Feature Set
  					 * Removable Media Notification
  					 * 15:2	reserved
  					 *  1:0	00 = not supported
  					 *	01 = supported
  					 *	10 = reserved
  					 *	11 = reserved
  					 */
  	unsigned short	dlf;		/* (word 128)
  					 * device lock function
  					 * 15:9	reserved
  					 *  8	security level 1:max 0:high
  					 *  7:6	reserved
  					 *  5	enhanced erase
  					 *  4	expire
  					 *  3	frozen
  					 *  2	locked
  					 *  1	en/disabled
  					 *  0	capability
  					 */
  	unsigned short  csfo;		/*  (word 129)
  					 * current set features options
  					 * 15:4	reserved
  					 *  3:	auto reassign
  					 *  2:	reverting
  					 *  1:	read-look-ahead
  					 *  0:	write cache
  					 */
  	unsigned short	words130_155[26];/* reserved vendor words 130-155 */
  	unsigned short	word156;	/* reserved vendor word 156 */
  	unsigned short	words157_159[3];/* reserved vendor words 157-159 */
  	unsigned short	cfa_power;	/* (word 160) CFA Power Mode
  					 * 15 word 160 supported
  					 * 14 reserved
  					 * 13
  					 * 12
  					 * 11:0
  					 */
  	unsigned short	words161_175[14];/* Reserved for CFA */
  	unsigned short	words176_205[31];/* Current Media Serial Number */
  	unsigned short	words206_254[48];/* reserved words 206-254 */
  	unsigned short	integrity_word;	/* (word 255)
  					 * 15:8 Checksum
  					 *  7:0 Signature
  					 */
  };
  
  /*
   * IDE "nice" flags. These are used on a per drive basis to determine
   * when to be nice and give more bandwidth to the other devices which
   * share the same IDE bus.
   */
  #define IDE_NICE_DSC_OVERLAP	(0)	/* per the DSC overlap protocol */
  #define IDE_NICE_ATAPI_OVERLAP	(1)	/* not supported yet */
  #define IDE_NICE_0		(2)	/* when sure that it won't affect us */
  #define IDE_NICE_1		(3)	/* when probably won't affect us much */
  #define IDE_NICE_2		(4)	/* when we know it's on our expense */
  
  #ifdef __KERNEL__
  /*
   * These routines are used for kernel command line parameters from main.c:
   */
  #include <linux/config.h>
  
  #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
  int ide_register(int io_port, int ctl_port, int irq);
  void ide_unregister(unsigned int);
  #endif /* CONFIG_BLK_DEV_IDE || CONFIG_BLK_DEV_IDE_MODULE */
  
  #endif  /* __KERNEL__ */
  
  #endif	/* _LINUX_HDREG_H */
  