/*-
 *  $Id: device.h,v 1.2 90/01/27 20:39:10 Rhialto Exp $
 *
 *  This code is (C) Copyright 1989 by Olaf Seibert. All rights reserved. May
 *  not be used or copied without a licence.
-*/

#define MD_NUMUNITS	4

#define VERSION 	34L
#define REVISION	5

#asm
VERSION     equ 	34
RTPRI	    equ 	0
#endasm

struct MessyDevice {
    struct Device   md_Dev;
    struct MessyUnit *md_Unit[MD_NUMUNITS];
    long	    md_Seglist;
    struct SignalSemaphore md_HardwareUse;
    byte	   *md_Rawbuffer;
    byte	    md_MfmDecode[128];
};

#define dev_Node	md_Dev.dd_Library.lib_Node
#define dev_Flags	md_Dev.dd_Library.lib_Flags
#define dev_NegSize	md_Dev.dd_Library.lib_NegSize
#define dev_PosSize	md_Dev.dd_Library.lib_PosSize
#define dev_Version	md_Dev.dd_Library.lib_Version
#define dev_Revision	md_Dev.dd_Library.lib_Revision
#define dev_IdString	md_Dev.dd_Library.lib_IdString
#define dev_OpenCnt	md_Dev.dd_Library.lib_OpenCnt

struct MessyUnit {
    struct MsgPort  mu_Port;
    short	    mu_OpenCnt;
    short	    mu_UnitNr;
    byte	    mu_Flags;
    char	    mu_InitSectorStatus;
    ulong	    mu_ChangeNum;
    char	    mu_DiskState;
    byte	    mu_DmaSignal;
    short	    mu_SectorsPerTrack; /* The nominal #sectors/track */
    short	    mu_CurrentSectors;	/* The current #sectors on this track */
    short	    mu_CurrentTrack;	/* Position of the head, and */
    short	    mu_CurrentSide;	/* what's in the track buffer */
    short	    mu_TrackChanged;
    struct DiskResourceUnit mu_DRUnit;
    struct MsgPort  mu_DiskReplyPort;
    struct IOExtTD *mu_DiskIOReq;
    struct IOStdReq *mu_DiskChangeReq;
    struct Interrupt mu_DiskChangeInt;
    struct MinList  mu_ChangeIntList;
    short	    mu_NumCyls;
    byte	    mu_TrackBuffer[MS_SPT_MAX * MS_BPS];   /* Must be word aligned */
    word	    mu_CrcBuffer[MS_SPT_MAX];
    char	    mu_SectorStatus[MS_SPT_MAX];
};

#define     TDERR_NoError   0
#define     CRC_UNCHECKED   -1
#define     CRC_CHANGED     -2

#define UNITB_ACTIVE	0
#define UNITF_STOPPED	(1<<2)
#define UNITF_WAKETASK	(1<<3)

#define STATEF_UNKNOWN	(1<<0)
#define STATEF_PRESENT	(1<<1)
#define STATEF_WRITABLE (1<<2)

/* Some constants related to #defines */
#asm
MS_BPS		    equ 512
MS_BPScode	    equ 2		    ; 2log(MSBPS/128)
LOG2_MS_BPS	    equ 9
MS_SPT		    equ 9
MS_SPT_MAX	    equ 10
#endasm

typedef struct MessyDevice DEV;
typedef struct MessyUnit   UNIT;


#define TASKPRI     5L
#define TASKSTACK   2048L

/*
 *  Which of the device commands are real, and which are
 *  routed to trackdisk.device.
 */

/*  #define CMD_Invalid     /**/
/*  #define CMD_Reset	    /**/
/*  #define CMD_Read	    /**/
/*  #define CMD_Write	    /**/
/*  #define CMD_Update	    /**/
/*  #define CMD_Clear	    /**/
/*  #define CMD_Stop	    /**/
/*  #define CMD_Start	    /**/
/*  #define CMD_Flush	    /**/
    #define TD_Motor	    TrackdiskGateway
/*  #define TD_Seek	    /**/
/*  #define TD_Format	    /**/
    #define TD_Remove	    TrackdiskGateway
/*  #define TD_Changenum    /**/
    #define TD_Changestate  TrackdiskGateway
    #define TD_Protstatus   TrackdiskGateway
    #define TD_Rawread	    TrackdiskGateway
    #define TD_Rawwrite     TrackdiskGateway
    #define TD_Getdrivetype TrackdiskGateway
    #define TD_Getnumtracks TrackdiskGateway
/*  #define TD_Addchangeint /**/
/*  #define TD_Remchangeint /**/

#define STRIP(cmd)  ((unsigned char)cmd)
#define IMMEDIATE   ((1<<CMD_INVALID)|(1<<CMD_RESET)|\
		     (1<<CMD_STOP)|(1<<CMD_START)|(1<<CMD_FLUSH)|\
		     (1L<<TD_ADDCHANGEINT))
#define PerformIO(ioreq, unit) \
		    (funcTable[STRIP(ioreq->io_Command)])(ioreq, unit)

extern DEV *MakeLibrary();
extern struct Task *FindTask();
extern struct Task *CreateTask();

/*
 *  Forward declarations:
 */

extern char EndCode;
extern void Init(), _DevOpen(), _DevClose(), _DevExpunge(), _LibNull();
extern void _DevBeginIO(), _DevAbortIO();

extern char DevName[], idString[];

extern DEV *CInit();
extern void DevOpen();
extern long DevClose(), DevExpunge();
extern void DevBeginIO(), TermIO();
extern long DevAbortIO();

extern void WakePort();
extern void UnitTask();

extern int DevInit();
extern UNIT *UnitInit();
extern void DiskChangeHandler();

extern void TrackdiskGateway();
extern void CMD_Invalid();
extern void CMD_Reset();
extern void CMD_Read();
extern void CMD_Write();
extern void CMD_Update();
extern void CMD_Clear();
extern void CMD_Stop();
extern void CMD_Start();
extern void CMD_Flush();
extern void TD_Seek();
extern void TD_Format();
extern void TD_Changenum();
extern void TD_Addchangeint();
extern void TD_Remchangeint();

extern struct DiskResource *OpenResource();
extern struct MsgPort *DeviceProc();
extern struct MsgPort *CreatePort();
extern struct IOExtTD *CreateExtIO();
extern void    *GetUnit(), *GetMsg();
extern long	Wait();
extern void    *AllocMem(), FreeMem();
extern byte    *index(), *rindex();

extern int	ReadTrack();
extern void	InitDecoding();
extern int	TDSeek();
extern int	TDMotorOn();
extern int	TDMotorOff();
extern int	TDGetNumCyls();
extern void    *GetDrive();
extern void	FreeDrive();
extern int	DevOpenUp();
extern int	DevCloseDown();
extern int	GetTrack();
extern int	CheckRequest();

#ifndef READONLY
extern int	InitWrite();
extern void	FreeBuffer();
extern void	EncodeTrack();
#endif