/*** libraries/filehandler.h **********************************************
*
*  device and file handler specific code for AmigaDOS
*
* Copyright (C) 1986,  Commodore-Amiga, Inc., All rights reserved.
*
* $Header: filehandler.h,v 33.3 86/05/21 19:14:02 neil Exp $
*
* $Locker:  $
*
****************************************************************************/

#ifndef LIBRARIES_FILEHANDLER_H
#define LIBRARIES_FILEHANDLER_H 1

#ifndef   EXEC_TYPES_H
#include "exec/types.h"
#endif   !EXEC_TYPES_H

#ifndef   EXEC_PORTS_H
#include "exec/ports.h"
#endif   !EXEC_PORTS_H

#ifndef   LIBRARIES_DOS_H
#include "libraries/dos.h"
#endif   !LIBRARIES_DOS_H


/* The disk "environment" is a longword array that describes the
** disk geometry.  It is variable sized, with the length at the beginning.
** Here are the constants for a standard geometry.
*/

/* these are the offsets into the array */
#define DE_TABLESIZE    0       /* standard value is 11 */
#define DE_SIZEBLOCK    1       /* in longwords: standard value is 128 */
#define DE_SECORG       2       /* not used; must be 0 */
#define DE_NUMHEADS     3       /* # of heads (surfaces). drive specific */
#define DE_SECSPERBLK   4       /* not used; must be 1 */
#define DE_BLKSPERTRACK 5       /* blocks per track. drive specific */
#define DE_RESERVEDBLKS 6       /* unavailable blocks at start.  usually 2 */
#define DE_PREFAC       7       /* not used; must be 0 */
#define DE_INTERLEAVE   8       /* usually 0 */
#define DE_LOWCYL       9       /* starting cylinder. typically 0 */
#define DE_UPPERCYL     10      /* max cylinder.  drive specific */
#define DE_NUMBUFFERS   11      /* starting # of buffers.  typically 5 */
#define DE_MEMBUFTYPE   12      /* type of mem to allocate for buffers.
                                ** default is 3, hard disks want 0 */

/* The file system startup message is linked into a device node's startup
** field.  It contains a pointer to the above environment, plus the
** information needed to do an exec OpenDevice().
*/
struct FileSysStartupMsg {
    ULONG       fssm_Unit;      /* exec unit number for this device */
    BSTR        fssm_Device;    /* null terminated bstring to the device name */
    BPTR        fssm_Environ;   /* ptr to environment table (see above) */
    ULONG       fssm_Flags;     /* flags for OpenDevice() */
};


/* The include file "libraries/dosextens.h" has a DeviceList structure.
** The "device list" can have one of three different things linked onto
** it.  Dosextens defines the structure for a volume.  DLT_DIRECTORY
** is for an assigned directory.  The following structure is for
** a dos "device" (DLT_DEVICE).
*/
struct DeviceNode {
    BPTR        dn_Next;        /* singly linked list */
    ULONG       dn_Type;        /* always 0 for dos "devices" */
    struct MsgPort *dn_Task;    /* standard dos "task" field.  If this is
                                 * null when the node is accesses, a task
                                 * will be started up
                                 */
    BPTR        dn_Lock;        /* not used for devices -- leave null */
    BSTR        dn_Handler;     /* filename to loadseg (if seglist is null) */
    ULONG       dn_StackSize;   /* stacksize to use when starting task */
    LONG        dn_Priority;    /* task priority when starting task */
    BPTR        dn_Startup;     /* startup msg: FileSysStartupMsg for disks */
    BPTR        dn_SegList;     /* code to run to start new task (if necessary).
                                 * if null then dn_Handler will be loaded.
                                 */
    BPTR        dn_GlobalVec;   /* BCPL global vector to use when starting
                                 * a task.  -1 means that dn_SegList is not
                                 * for a bcpl program, so the dos won't
                                 * try and construct one.  0 tell the
                                 * dos that you obey BCPL linkage rules,
                                 * and that it should construct a global
                                 * vector for you.
                                 */
    BSTR        dn_Name;        /* the node name, e.g. '\3','D','F','3' */
};


    




#endif !LIBRARIES_FILEHANDLER_H