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+
+Linux I2O User Space Interface
+rev 0.3 - 04/20/99
+
+=============================================================================
+Originally written by Deepak Saxena(deepak@plexity.net)
+Currently maintained by Deepak Saxena(deepak@plexity.net)
+=============================================================================
+
+I. Introduction
+
+The Linux I2O subsystem provides a set of ioctl() commands that can be
+utilized by user space applications to communicate with IOPs and devices
+on individual IOPs. This document defines the specific ioctl() commands
+that are available to the user and provides examples of their uses.
+
+This document assumes the reader is familiar with or has access to the
+I2O specification as no I2O message parameters are outlined.  For information
+on the specification, see http://www.i2osig.org
+
+This document and the I2O user space interface are currently maintained
+by Deepak Saxena.  Please send all comments, errata, and bug fixes to
+deepak@csociety.purdue.edu
+
+II. IOP Access
+
+Access to the I2O subsystem is provided through the device file named
+/dev/i2o/ctl.  This file is a character file with major number 10 and minor
+number 166.  It can be created through the following command:
+
+   mknod /dev/i2o/ctl c 10 166
+
+III. Determining the IOP Count
+
+   SYNOPSIS
+
+   ioctl(fd, I2OGETIOPS,  int *count);
+
+   u8 count[MAX_I2O_CONTROLLERS];
+
+   DESCRIPTION
+
+   This function returns the system's active IOP table.  count should
+   point to a buffer containing MAX_I2O_CONTROLLERS entries.  Upon
+   returning, each entry will contain a non-zero value if the given
+   IOP unit is active, and NULL if it is inactive or non-existent.
+
+   RETURN VALUE.
+
+   Returns 0 if no errors occur, and -1 otherwise.  If an error occurs,
+   errno is set appropriately:
+
+     EFAULT   Invalid user space pointer was passed
+
+IV. Getting Hardware Resource Table
+
+   SYNOPSIS
+
+   ioctl(fd, I2OHRTGET, struct i2o_cmd_hrt *hrt);
+
+      struct i2o_cmd_hrtlct
+      {
+         u32   iop;      /* IOP unit number */
+         void  *resbuf;  /* Buffer for result */
+         u32   *reslen;  /* Buffer length in bytes */
+      };
+
+   DESCRIPTION
+
+   This function returns the Hardware Resource Table of the IOP specified
+   by hrt->iop in the buffer pointed to by hrt->resbuf. The actual size of
+   the data is written into *(hrt->reslen).
+
+   RETURNS
+
+   This function returns 0 if no errors occur. If an error occurs, -1
+   is returned and errno is set appropriately:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ENOBUFS     Buffer not large enough.  If this occurs, the required
+                  buffer length is written into *(hrt->reslen)
+
+V. Getting Logical Configuration Table
+
+   SYNOPSIS
+
+   ioctl(fd, I2OLCTGET, struct i2o_cmd_lct *lct);
+
+      struct i2o_cmd_hrtlct
+      {
+         u32   iop;      /* IOP unit number */
+         void  *resbuf;  /* Buffer for result */
+         u32   *reslen;  /* Buffer length in bytes */
+      };
+
+   DESCRIPTION
+
+   This function returns the Logical Configuration Table of the IOP specified
+   by lct->iop in the buffer pointed to by lct->resbuf. The actual size of
+   the data is written into *(lct->reslen).
+
+   RETURNS
+
+   This function returns 0 if no errors occur. If an error occurs, -1
+   is returned and errno is set appropriately:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ENOBUFS     Buffer not large enough.  If this occurs, the required
+                  buffer length is written into *(lct->reslen)
+
+VI. Settting Parameters
+
+   SYNOPSIS
+
+   ioctl(fd, I2OPARMSET, struct i2o_parm_setget *ops);
+
+      struct i2o_cmd_psetget
+      {
+         u32   iop;      /* IOP unit number */
+         u32   tid;      /* Target device TID */
+         void  *opbuf;   /* Operation List buffer */
+         u32   oplen;    /* Operation List buffer length in bytes */
+         void  *resbuf;  /* Result List buffer */
+         u32   *reslen;  /* Result List buffer length in bytes */
+      };
+
+   DESCRIPTION
+
+   This function posts a UtilParamsSet message to the device identified
+   by ops->iop and ops->tid.  The operation list for the message is
+   sent through the ops->opbuf buffer, and the result list is written
+   into the buffer pointed to by ops->resbuf.  The number of bytes
+   written is placed into *(ops->reslen).
+
+   RETURNS
+
+   The return value is the size in bytes of the data written into
+   ops->resbuf if no errors occur.  If an error occurs, -1 is returned
+   and errno is set appropriatly:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ENOBUFS     Buffer not large enough.  If this occurs, the required
+                  buffer length is written into *(ops->reslen)
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+   A return value of 0 does not mean that the value was actually
+   changed properly on the IOP.  The user should check the result
+   list to determine the specific status of the transaction.
+
+VII. Getting Parameters
+
+   SYNOPSIS
+
+   ioctl(fd, I2OPARMGET, struct i2o_parm_setget *ops);
+
+      struct i2o_parm_setget
+      {
+         u32   iop;      /* IOP unit number */
+         u32   tid;      /* Target device TID */
+         void  *opbuf;   /* Operation List buffer */
+         u32   oplen;    /* Operation List buffer length in bytes */
+         void  *resbuf;  /* Result List buffer */
+         u32   *reslen;  /* Result List buffer length in bytes */
+      };
+
+   DESCRIPTION
+
+   This function posts a UtilParamsGet message to the device identified
+   by ops->iop and ops->tid.  The operation list for the message is
+   sent through the ops->opbuf buffer, and the result list is written
+   into the buffer pointed to by ops->resbuf.  The actual size of data
+   written is placed into *(ops->reslen).
+
+   RETURNS
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ENOBUFS     Buffer not large enough.  If this occurs, the required
+                  buffer length is written into *(ops->reslen)
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+   A return value of 0 does not mean that the value was actually
+   properly retreived.  The user should check the result list
+   to determine the specific status of the transaction.
+
+VIII. Downloading Software
+
+   SYNOPSIS
+
+   ioctl(fd, I2OSWDL, struct i2o_sw_xfer *sw);
+
+      struct i2o_sw_xfer
+      {
+         u32   iop;       /* IOP unit number */
+         u8    flags;     /* DownloadFlags field */
+         u8    sw_type;   /* Software type */
+         u32   sw_id;     /* Software ID */
+         void  *buf;      /* Pointer to software buffer */
+         u32   *swlen;    /* Length of software buffer */
+         u32   *maxfrag;  /* Number of fragments */
+         u32   *curfrag;  /* Current fragment number */
+      };
+
+   DESCRIPTION
+
+   This function downloads a software fragment pointed by sw->buf
+   to the iop identified by sw->iop. The DownloadFlags, SwID, SwType
+   and SwSize fields of the ExecSwDownload message are filled in with
+   the values of sw->flags, sw->sw_id, sw->sw_type and *(sw->swlen).
+
+   The fragments _must_ be sent in order and be 8K in size. The last
+   fragment _may_ be shorter, however. The kernel will compute its
+   size based on information in the sw->swlen field.
+
+   Please note that SW transfers can take a long time.
+
+   RETURNS
+
+   This function returns 0 no errors occur. If an error occurs, -1
+   is returned and errno is set appropriatly:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+IX. Uploading Software
+
+   SYNOPSIS
+
+   ioctl(fd, I2OSWUL, struct i2o_sw_xfer *sw);
+
+      struct i2o_sw_xfer
+      {
+         u32   iop;      /* IOP unit number */
+         u8    flags; 	 /* UploadFlags */
+         u8    sw_type;  /* Software type */
+         u32   sw_id;    /* Software ID */
+         void  *buf;     /* Pointer to software buffer */
+         u32   *swlen;   /* Length of software buffer */
+         u32   *maxfrag; /* Number of fragments */
+         u32   *curfrag; /* Current fragment number */
+      };
+
+   DESCRIPTION
+
+   This function uploads a software fragment from the IOP identified
+   by sw->iop, sw->sw_type, sw->sw_id and optionally sw->swlen fields.
+   The UploadFlags, SwID, SwType and SwSize fields of the ExecSwUpload
+   message are filled in with the values of sw->flags, sw->sw_id,
+   sw->sw_type and *(sw->swlen).
+
+   The fragments _must_ be requested in order and be 8K in size. The
+   user is responsible for allocating memory pointed by sw->buf. The
+   last fragment _may_ be shorter.
+
+   Please note that SW transfers can take a long time.
+
+   RETURNS
+
+   This function returns 0 if no errors occur.  If an error occurs, -1
+   is returned and errno is set appropriatly:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+X. Removing Software
+
+   SYNOPSIS
+
+   ioctl(fd, I2OSWDEL, struct i2o_sw_xfer *sw);
+
+      struct i2o_sw_xfer
+      {
+         u32   iop;      /* IOP unit number */
+         u8    flags; 	 /* RemoveFlags */
+         u8    sw_type;  /* Software type */
+         u32   sw_id;    /* Software ID */
+         void  *buf;     /* Unused */
+         u32   *swlen;   /* Length of the software data */
+         u32   *maxfrag; /* Unused */
+         u32   *curfrag; /* Unused */
+      };
+
+   DESCRIPTION
+
+   This function removes software from the IOP identified by sw->iop.
+   The RemoveFlags, SwID, SwType and SwSize fields of the ExecSwRemove message
+   are filled in with the values of sw->flags, sw->sw_id, sw->sw_type and
+   *(sw->swlen). Give zero in *(sw->len) if the value is unknown. IOP uses
+   *(sw->swlen) value to verify correct identication of the module to remove.
+   The actual size of the module is written into *(sw->swlen).
+
+   RETURNS
+
+   This function returns 0 if no errors occur.  If an error occurs, -1
+   is returned and errno is set appropriatly:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+X. Validating Configuration
+
+   SYNOPSIS
+
+   ioctl(fd, I2OVALIDATE, int *iop);
+	u32 iop;
+
+   DESCRIPTION
+
+   This function posts an ExecConfigValidate message to the controller
+   identified by iop. This message indicates that the current
+   configuration is accepted. The iop changes the status of suspect drivers
+   to valid and may delete old drivers from its store.
+
+   RETURNS
+
+   This function returns 0 if no erro occur.  If an error occurs, -1 is
+   returned and errno is set appropriatly:
+
+      ETIMEDOUT   Timeout waiting for reply message
+      ENXIO       Invalid IOP number
+
+XI. Configuration Dialog
+
+   SYNOPSIS
+
+   ioctl(fd, I2OHTML, struct i2o_html *htquery);
+      struct i2o_html
+      {
+         u32   iop;      /* IOP unit number */
+         u32   tid;      /* Target device ID */
+         u32   page;     /* HTML page */
+         void  *resbuf;  /* Buffer for reply HTML page */
+         u32   *reslen;  /* Length in bytes of reply buffer */
+         void  *qbuf;    /* Pointer to HTTP query string */
+         u32   qlen;     /* Length in bytes of query string buffer */
+      };
+
+   DESCRIPTION
+
+   This function posts an UtilConfigDialog message to the device identified
+   by htquery->iop and htquery->tid.  The requested HTML page number is
+   provided by the htquery->page field, and the resultant data is stored
+   in the buffer pointed to by htquery->resbuf.  If there is an HTTP query
+   string that is to be sent to the device, it should be sent in the buffer
+   pointed to by htquery->qbuf.  If there is no query string, this field
+   should be set to NULL. The actual size of the reply received is written
+   into *(htquery->reslen).
+
+   RETURNS
+
+   This function returns 0 if no error occur. If an error occurs, -1
+   is returned and errno is set appropriatly:
+
+      EFAULT      Invalid user space pointer was passed
+      ENXIO       Invalid IOP number
+      ENOBUFS     Buffer not large enough.  If this occurs, the required
+                  buffer length is written into *(ops->reslen)
+      ETIMEDOUT   Timeout waiting for reply message
+      ENOMEM      Kernel memory allocation error
+
+XII. Events
+
+    In the process of determining this.  Current idea is to have use
+    the select() interface to allow user apps to periodically poll
+    the /dev/i2o/ctl device for events.  When select() notifies the user
+    that an event is available, the user would call read() to retrieve
+    a list of all the events that are pending for the specific device.
+
+=============================================================================
+Revision History
+=============================================================================
+
+Rev 0.1 - 04/01/99
+- Initial revision
+
+Rev 0.2 - 04/06/99
+- Changed return values to match UNIX ioctl() standard.  Only return values
+  are 0 and -1.  All errors are reported through errno.
+- Added summary of proposed possible event interfaces
+
+Rev 0.3 - 04/20/99
+- Changed all ioctls() to use pointers to user data instead of actual data
+- Updated error values to match the code