Import sources from 2011-03-30 iso image

1 files changed, 183 insertions, 0 deletions

diff --git a/sys/src/9/pc/floppy.h b/sys/src/9/pc/floppy.h
new file mode 100755
index 000000000..f84c9eae7
--- /dev/null
+++ b/sys/src/9/pc/floppy.h
@@ -0,0 +1,183 @@
+typedef	struct FController FController;
+typedef	struct FDrive FDrive;
+typedef struct FType FType;
+
+static void floppyintr(Ureg*);
+static int floppyon(FDrive*);
+static void floppyoff(FDrive*);
+static void floppysetdef(FDrive*);
+
+/*
+ *  a floppy drive
+ */
+struct FDrive
+{
+	FType	*t;		/* floppy type */
+	int	dt;		/* drive type */
+	int	dev;
+
+	ulong	lasttouched;	/* time last touched */
+	int	cyl;		/* current arm position */
+	int	confused;	/* needs to be recalibrated */
+	int	vers;
+	int	maxtries;	/* max read attempts before Eio */
+
+	int	tcyl;		/* target cylinder */
+	int	thead;		/* target head */
+	int	tsec;		/* target sector */
+	long	len;		/* size of xfer */
+
+	uchar	*cache;		/* track cache */
+	int	ccyl;
+	int	chead;
+};
+
+/*
+ *  controller for 4 floppys
+ */
+struct FController
+{
+	QLock;			/* exclusive access to the contoller */
+
+	int	ndrive;
+	FDrive	*d;		/* the floppy drives */
+	FDrive	*selected;
+	int	rate;		/* current rate selected */
+	uchar	cmd[14];	/* command */
+	int	ncmd;		/* # command bytes */
+	uchar	stat[14];	/* command status */
+	int	nstat;		/* # status bytes */
+	int	confused;	/* controler needs to be reset */
+	Rendez	r;		/* wait here for command termination */
+	int	motor;		/* bit mask of spinning disks */
+};
+
+/*
+ *  floppy types (all MFM encoding)
+ */
+struct FType
+{
+	char	*name;
+	int	dt;		/* compatible drive type */
+	int	bytes;		/* bytes/sector */
+	int	sectors;	/* sectors/track */
+	int	heads;		/* number of heads */
+	int	steps;		/* steps per cylinder */
+	int	tracks;		/* tracks/disk */
+	int	gpl;		/* intersector gap length for read/write */	
+	int	fgpl;		/* intersector gap length for format */
+	int	rate;		/* rate code */
+
+	/*
+	 *  these depend on previous entries and are set filled in
+	 *  by floppyinit
+	 */
+	int	bcode;		/* coded version of bytes for the controller */
+	long	cap;		/* drive capacity in bytes */
+	long	tsize;		/* track size in bytes */
+};
+/* bits in the registers */
+enum
+{
+	/* status registers a & b */
+	Psra=		0x3f0,
+	Psrb=		0x3f1,
+
+	/* digital output register */
+	Pdor=		0x3f2,
+	Fintena=	0x8,	/* enable floppy interrupt */
+	Fena=		0x4,	/* 0 == reset controller */
+
+	/* main status register */
+	Pmsr=		0x3f4,
+	Fready=		0x80,	/* ready to be touched */
+	Ffrom=		0x40,	/* data from controller */
+	Ffloppybusy=	0x10,	/* operation not over */
+
+	/* data register */
+	Pfdata=		0x3f5,
+	Frecal=		0x07,	/* recalibrate cmd */
+	Fseek=		0x0f,	/* seek cmd */
+	Fsense=		0x08,	/* sense cmd */
+	Fread=		0x66,	/* read cmd */
+	Freadid=	0x4a,	/* read track id */
+	Fspec=		0x03,	/* set hold times */
+	Fwrite=		0x45,	/* write cmd */
+	Fformat=	0x4d,	/* format cmd */
+	Fmulti=		0x80,	/* or'd with Fread or Fwrite for multi-head */
+	Fdumpreg=	0x0e,	/* dump internal registers */
+
+	/* digital input register */
+	Pdir=		0x3F7,	/* disk changed port (read only) */
+	Pdsr=		0x3F7,	/* data rate select port (write only) */
+	Fchange=	0x80,	/* disk has changed */
+
+	/* status 0 byte */
+	Drivemask=	3<<0,
+	Seekend=	1<<5,
+	Codemask=	(3<<6)|(3<<3),
+	Cmdexec=	1<<6,
+
+	/* status 1 byte */
+	Overrun=	0x10,
+};
+
+
+static void
+pcfloppyintr(Ureg *ur, void *a)
+{
+	USED(a);
+
+	floppyintr(ur);
+}
+
+void
+floppysetup0(FController *fl)
+{
+	fl->ndrive = 0;
+	if(ioalloc(Psra, 6, 0, "floppy") < 0)
+		return;
+	if(ioalloc(Pdir, 1, 0, "floppy") < 0){
+		iofree(Psra);
+		return;
+	}
+	fl->ndrive = 2;
+}
+
+void
+floppysetup1(FController *fl)
+{
+	uchar equip;
+
+	/*
+	 *  read nvram for types of floppies 0 & 1
+	 */
+	equip = nvramread(0x10);
+	if(fl->ndrive > 0){
+		fl->d[0].dt = (equip >> 4) & 0xf;
+		floppysetdef(&fl->d[0]);
+	}
+	if(fl->ndrive > 1){
+		fl->d[1].dt = equip & 0xf;
+		floppysetdef(&fl->d[1]);
+	}
+	intrenable(IrqFLOPPY, pcfloppyintr, fl, BUSUNKNOWN, "floppy");
+}
+
+/*
+ *  eject disk ( unknown on safari )
+ */
+void
+floppyeject(FDrive *dp)
+{
+	floppyon(dp);
+	dp->vers++;
+	floppyoff(dp);
+}
+
+int 
+floppyexec(char *a, long b, int c)
+{
+	USED(a, b, c);
+	return b;
+}