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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/9/pc/floppy.h – Rev 2

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typedef	struct FController FController;
2 
typedef	struct FDrive FDrive;
3 
typedef struct FType FType;
4 
 
5 
static void floppyintr(Ureg*);
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static int floppyon(FDrive*);
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static void floppyoff(FDrive*);
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static void floppysetdef(FDrive*);
9 
 
10 
/*
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 *  a floppy drive
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 */
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struct FDrive
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{
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	FType	*t;		/* floppy type */
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	int	dt;		/* drive type */
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	int	dev;
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	ulong	lasttouched;	/* time last touched */
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	int	cyl;		/* current arm position */
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	int	confused;	/* needs to be recalibrated */
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	int	vers;
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	int	maxtries;	/* max read attempts before Eio */
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	int	tcyl;		/* target cylinder */
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	int	thead;		/* target head */
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	int	tsec;		/* target sector */
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	long	len;		/* size of xfer */
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	uchar	*cache;		/* track cache */
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	int	ccyl;
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	int	chead;
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};
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/*
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 *  controller for 4 floppys
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 */
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struct FController
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{
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	QLock;			/* exclusive access to the contoller */
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	int	ndrive;
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	FDrive	*d;		/* the floppy drives */
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	FDrive	*selected;
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	int	rate;		/* current rate selected */
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	uchar	cmd[14];	/* command */
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	int	ncmd;		/* # command bytes */
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	uchar	stat[14];	/* command status */
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	int	nstat;		/* # status bytes */
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	int	confused;	/* controler needs to be reset */
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	Rendez	r;		/* wait here for command termination */
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	int	motor;		/* bit mask of spinning disks */
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};
54 
 
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/*
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 *  floppy types (all MFM encoding)
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 */
58 
struct FType
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{
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	char	*name;
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	int	dt;		/* compatible drive type */
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	int	bytes;		/* bytes/sector */
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	int	sectors;	/* sectors/track */
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	int	heads;		/* number of heads */
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	int	steps;		/* steps per cylinder */
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	int	tracks;		/* tracks/disk */
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	int	gpl;		/* intersector gap length for read/write */
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	int	fgpl;		/* intersector gap length for format */
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	int	rate;		/* rate code */
70 
 
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	/*
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	 *  these depend on previous entries and are set filled in
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	 *  by floppyinit
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	 */
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	int	bcode;		/* coded version of bytes for the controller */
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	long	cap;		/* drive capacity in bytes */
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	long	tsize;		/* track size in bytes */
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};
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/* bits in the registers */
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enum
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{
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	/* status registers a & b */
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	Psra=		0x3f0,
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	Psrb=		0x3f1,
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	/* digital output register */
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	Pdor=		0x3f2,
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	Fintena=	0x8,	/* enable floppy interrupt */
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	Fena=		0x4,	/* 0 == reset controller */
90 
 
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	/* main status register */
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	Pmsr=		0x3f4,
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	Fready=		0x80,	/* ready to be touched */
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	Ffrom=		0x40,	/* data from controller */
95 
	Ffloppybusy=	0x10,	/* operation not over */
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	/* data register */
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	Pfdata=		0x3f5,
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	Frecal=		0x07,	/* recalibrate cmd */
100 
	Fseek=		0x0f,	/* seek cmd */
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	Fsense=		0x08,	/* sense cmd */
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	Fread=		0x66,	/* read cmd */
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	Freadid=	0x4a,	/* read track id */
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	Fspec=		0x03,	/* set hold times */
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	Fwrite=		0x45,	/* write cmd */
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	Fformat=	0x4d,	/* format cmd */
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	Fmulti=		0x80,	/* or'd with Fread or Fwrite for multi-head */
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	Fdumpreg=	0x0e,	/* dump internal registers */
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	/* digital input register */
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	Pdir=		0x3F7,	/* disk changed port (read only) */
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	Pdsr=		0x3F7,	/* data rate select port (write only) */
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	Fchange=	0x80,	/* disk has changed */
114 
 
115 
	/* status 0 byte */
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	Drivemask=	3<<0,
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	Seekend=	1<<5,
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	Codemask=	(3<<6)|(3<<3),
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	Cmdexec=	1<<6,
120 
 
121 
	/* status 1 byte */
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	Overrun=	0x10,
123 
};
124 
 
125 
 
126 
static void
127 
pcfloppyintr(Ureg *ur, void *a)
128 
{
129 
	USED(a);
130 
 
131 
	floppyintr(ur);
132 
}
133 
 
134 
void
135 
floppysetup0(FController *fl)
136 
{
137 
	fl->ndrive = 0;
138 
	if(ioalloc(Psra, 6, 0, "floppy") < 0)
139 
		return;
140 
	if(ioalloc(Pdir, 1, 0, "floppy") < 0){
141 
		iofree(Psra);
142 
		return;
143 
	}
144 
	fl->ndrive = 2;
145 
}
146 
 
147 
void
148 
floppysetup1(FController *fl)
149 
{
150 
	uchar equip;
151 
 
152 
	/*
153 
	 *  read nvram for types of floppies 0 & 1
154 
	 */
155 
	equip = nvramread(0x10);
156 
	if(fl->ndrive > 0){
157 
		fl->d[0].dt = (equip >> 4) & 0xf;
158 
		floppysetdef(&fl->d[0]);
159 
	}
160 
	if(fl->ndrive > 1){
161 
		fl->d[1].dt = equip & 0xf;
162 
		floppysetdef(&fl->d[1]);
163 
	}
164 
	intrenable(IrqFLOPPY, pcfloppyintr, fl, BUSUNKNOWN, "floppy");
165 
}
166 
 
167 
/*
168 
 *  eject disk ( unknown on safari )
169 
 */
170 
void
171 
floppyeject(FDrive *dp)
172 
{
173 
	floppyon(dp);
174 
	dp->vers++;
175 
	floppyoff(dp);
176 
}
177 
 
178 
int
179 
floppyexec(char *a, long b, int c)
180 
{
181 
	USED(a, b, c);
182 
	return b;
183 
}