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  $   ˆÁÀ„aqß¿a–Ðz¾””ÔD¨ 	Å €ÆÄ¦-ÿÃ ;?    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SCSI_GENERIC_H
#define _SCSI_GENERIC_H

#include <linux/compiler.h>

/*
 * History:
 *  Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
 *   process control of SCSI devices.
 *  Development Sponsored by Killy Corp. NY NY
 *
 * Original driver (sg.h):
 *       Copyright (C) 1992 Lawrence Foard
 * Version 2 and 3 extensions to driver:
 *	Copyright (C) 1998 - 2014 Douglas Gilbert
 *
 *  Version: 3.5.36 (20140603)
 *  This version is for 2.6 and 3 series kernels.
 *
 * Documentation
 * =============
 * A web site for the SG device driver can be found at:
 *	http://sg.danny.cz/sg  [alternatively check the MAINTAINERS file]
 * The documentation for the sg version 3 driver can be found at:
 *	http://sg.danny.cz/sg/p/sg_v3_ho.html
 * Also see: <kernel_source>/Documentation/scsi/scsi-generic.rst
 *
 * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
 */

#ifdef __KERNEL__
extern int sg_big_buff; /* for sysctl */
#endif


typedef struct sg_iovec /* same structure as used by readv() Linux system */
{                       /* call. It defines one scatter-gather element. */
    void __user *iov_base;      /* Starting address  */
    size_t iov_len;             /* Length in bytes  */
} sg_iovec_t;


typedef struct sg_io_hdr
{
    int interface_id;           /* [i] 'S' for SCSI generic (required) */
    int dxfer_direction;        /* [i] data transfer direction  */
    unsigned char cmd_len;      /* [i] SCSI command length */
    unsigned char mx_sb_len;    /* [i] max length to write to sbp */
    unsigned short iovec_count; /* [i] 0 implies no scatter gather */
    unsigned int dxfer_len;     /* [i] byte count of data transfer */
    void __user *dxferp;	/* [i], [*io] points to data transfer memory
					      or scatter gather list */
    unsigned char __user *cmdp; /* [i], [*i] points to command to perform */
    void __user *sbp;		/* [i], [*o] points to sense_buffer memory */
    unsigned int timeout;       /* [i] MAX_UINT->no timeout (unit: millisec) */
    unsigned int flags;         /* [i] 0 -> default, see SG_FLAG... */
    int pack_id;                /* [i->o] unused internally (normally) */
    void __user * usr_ptr;      /* [i->o] unused internally */
    unsigned char status;       /* [o] scsi status */
    unsigned char masked_status;/* [o] shifted, masked scsi status */
    unsigned char msg_status;   /* [o] messaging level data (optional) */
    unsigned char sb_len_wr;    /* [o] byte count actually written to sbp */
    unsigned short host_status; /* [o] errors from host adapter */
    unsigned short driver_status;/* [o] errors from software driver */
    int resid;                  /* [o] dxfer_len - actual_transferred */
    unsigned int duration;      /* [o] time taken by cmd (unit: millisec) */
    unsigned int info;          /* [o] auxiliary information */
} sg_io_hdr_t;  /* 64 bytes long (on i386) */

#if defined(__KERNEL__)
#include <linux/compat.h>

struct compat_sg_io_hdr {
	compat_int_t interface_id;	/* [i] 'S' for SCSI generic (required) */
	compat_int_t dxfer_direction;	/* [i] data transfer direction  */
	unsigned char cmd_len;		/* [i] SCSI command length ( <= 16 bytes) */
	unsigned char mx_sb_len;	/* [i] max length to write to sbp */
	unsigned short iovec_count;	/* [i] 0 implies no scatter gather */
	compat_uint_t dxfer_len;	/* [i] byte count of data transfer */
	compat_uint_t dxferp;		/* [i], [*io] points to data transfer memory
						or scatter gather list */
	compat_uptr_t cmdp;		/* [i], [*i] points to command to perform */
	compat_uptr_t sbp;		/* [i], [*o] points to sense_buffer memory */
	compat_uint_t timeout;		/* [i] MAX_UINT->no timeout (unit: millisec) */
	compat_uint_t flags;		/* [i] 0 -> default, see SG_FLAG... */
	compat_int_t pack_id;		/* [i->o] unused internally (normally) */
	compat_uptr_t usr_ptr;		/* [i->o] unused internally */
	unsigned char status;		/* [o] scsi status */
	unsigned char masked_status;	/* [o] shifted, masked scsi status */