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1a6bed6863
. The main device node now supports automatic density selection for
commonly used media densities. So you can stuff your 1.44 MB and
720 KB media into your drive and just access /dev/fd0, no questions
asked. It's all that easy, isn't it? :)
. Device density handling has been completely overhauled. The old way
of hardwired kernel density knowledge is no longer there. Instead,
the kernel now implements 16 subdevices per drive. The first
subdevice uses automatic density selection, while the remaining 15
devices are freely programmable. They can be assigned an arbitrary
name of the form /dev/fd[:digit]+.[:digit:]{1,4}, where the second
number is meant to either implement device names that are mnemonic
for their raw capacity (as it used to be), or they can alternatively
be created as "anonymous" devices like fd0.1 through fd0.15,
depending on the taste of the administrator. After creating a
subdevice, it is initialized to the maximal native density of the
respective drive type, so it needs to be customized for other
densities by using fdcontrol(8). Pseudo-partition devices (fd0a
through fd0h) are still supported as symlinks.
. The old hack to use flags 0x1 to always assume drive 0 were there is
no longer supported; this is now supposed to be done by wiring the
devices down from the loader via device flags. On IA32
architectures, the first two drives are looked up in the CMOS
configuration records though. On PCMCIA (i. e., the Y-E Data
controller of the Toshiba Libretto), a single drive is always
assumed.
. Other specialities like disabling the FIFO and not probing the drive
at boot-time are selected by per-controller or per-drive flags, too.
. Unit attentions (media has been changed) are supposed to be detected
now; density autoselection only occurs after a unit attention. (Can
be turned off by a per-drive flag, this will cause each Fdopen() to
perform the autoselection.)
. FM floppies can be handled now (on controllers that actually support
it -- not all do these days).
. Fdopen() can be told to avoid density selection by setting
O_NONBLOCK; this leaves the descriptor in a half-opened state where
only a few ioctls are accepted. This is necessary to run fdformat
on a device that uses automatic density selection (since you cannot
autoselect on an unformatted medium, obviously).
. Just differentiate between a plain old NE765 and the enhanced chips,
but don't try more; the existing code was wrong and only misdetected
the chips anyway.
BUGS and TODOs:
. All documentation update still needs to be done.
. Formatting not-so-standard format yields unpredictable results; i
have yet to figure out why this happens. "Standard" formats like
720 and 1440 KB do work, however.
. rc scripts are needed to setup device nodes with nonstandard
densities (like the old /dev/fdN.MMM we used to have).
. Obtaining device flags from the kernel environment doesn't work yet,
thus currently only drives that are present in (IA32) CMOS are
really detected. Someone who knows the odds and ends about device
flags is needed here, i can't figure out what i'm doing wrong.
. 2.88 MB still needs to be done.
171 lines
6.2 KiB
C
171 lines
6.2 KiB
C
/*
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* Copyright (C) 1992-1994,2001 by Joerg Wunsch, Dresden
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_IOCTL_FD_H_
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#define _MACHINE_IOCTL_FD_H_
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#ifndef _KERNEL
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#include <sys/types.h>
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#endif
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#include <sys/ioccom.h>
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#define FD_FORMAT_VERSION 110 /* used to validate before formatting */
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#define FD_MAX_NSEC 36 /* highest known number of spt - allow for */
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/* 2.88 MB drives */
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struct fd_formb {
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int format_version; /* == FD_FORMAT_VERSION */
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int cyl, head;
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int transfer_rate; /* FDC_???KBPS */
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union {
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struct fd_form_data {
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/*
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* DO NOT CHANGE THE LAYOUT OF THIS STRUCTS
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* it is hardware-dependent since it exactly
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* matches the byte sequence to write to FDC
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* during its `format track' operation
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*/
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u_char secshift; /* 0 -> 128, ...; usually 2 -> 512 */
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u_char nsecs; /* must be <= FD_MAX_NSEC */
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u_char gaplen; /* GAP 3 length; usually 84 */
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u_char fillbyte; /* usually 0xf6 */
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struct fd_idfield_data {
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/*
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* data to write into id fields;
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* for obscure formats, they mustn't match
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* the real values (but mostly do)
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*/
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u_char cylno; /* 0 thru 79 (or 39) */
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u_char headno; /* 0, or 1 */
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u_char secno; /* starting at 1! */
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u_char secsize; /* usually 2 */
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} idfields[FD_MAX_NSEC]; /* 0 <= idx < nsecs used */
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} structured;
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u_char raw[1]; /* to have continuous indexed access */
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} format_info;
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};
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/* make life easier */
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# define fd_formb_secshift format_info.structured.secshift
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# define fd_formb_nsecs format_info.structured.nsecs
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# define fd_formb_gaplen format_info.structured.gaplen
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# define fd_formb_fillbyte format_info.structured.fillbyte
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/* these data must be filled in for(i = 0; i < fd_formb_nsecs; i++) */
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# define fd_formb_cylno(i) format_info.structured.idfields[i].cylno
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# define fd_formb_headno(i) format_info.structured.idfields[i].headno
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# define fd_formb_secno(i) format_info.structured.idfields[i].secno
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# define fd_formb_secsize(i) format_info.structured.idfields[i].secsize
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struct fd_type {
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int sectrac; /* sectors per track */
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int secsize; /* size code for sectors */
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int datalen; /* data len when secsize = 0 */
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int gap; /* gap len between sectors */
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int tracks; /* total number of cylinders */
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int size; /* size of disk in sectors */
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int trans; /* transfer speed code */
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int heads; /* number of heads */
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int f_gap; /* format gap len */
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int f_inter; /* format interleave factor */
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int offset_side2; /* offset of sectors on side2 */
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int flags; /* misc. features */
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#define FL_MFM 0x0001 /* MFM recording */
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#define FL_2STEP 0x0002 /* 2 steps between cylinders */
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#define FL_PERPND 0x0004 /* perpendicular recording */
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};
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struct fdc_status {
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u_int status[7];
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};
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/*
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* cyl and head are being passed into ioctl(FD_READID)
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* all four fields are being returned
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*/
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struct fdc_readid {
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u_char cyl; /* C - 0...79 */
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u_char head; /* H - 0...1 */
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u_char sec; /* R - 1...n */
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u_char secshift; /* N - log2(secsize / 128) */
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};
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/*
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* Diskette drive type, basically the same as stored in RTC on ISA
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* machines (see /sys/isa/rtc.h), but right-shifted by four bits.
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*/
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enum fd_drivetype {
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FDT_NONE, FDT_360K, FDT_12M, FDT_720K, FDT_144M, FDT_288M_1,
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FDT_288M
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};
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#define FD_FORM _IOW('F', 61, struct fd_formb) /* format a track */
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#define FD_GTYPE _IOR('F', 62, struct fd_type) /* get drive type */
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#define FD_STYPE _IOW('F', 63, struct fd_type) /* set drive type */
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#define FD_GOPTS _IOR('F', 64, int) /* drive options, see below */
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#define FD_SOPTS _IOW('F', 65, int)
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#define FD_DEBUG _IOW('F', 66, int)
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#define FD_CLRERR _IO('F', 67) /* clear error counter */
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#define FD_READID _IOWR('F', 68, struct fdc_readid) /* read ID field */
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/*
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* Obtain NE765 status registers. Only successful if there is
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* a valid status stored in fdc->status[].
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*/
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#define FD_GSTAT _IOR('F', 69, struct fdc_status)
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#define FD_GDTYPE _IOR('F', 70, enum fd_drivetype) /* obtain drive type */
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/* Options for FD_GOPTS/FD_SOPTS, cleared on device close */
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#define FDOPT_NORETRY 0x0001 /* no retries on failure */
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#define FDOPT_NOERRLOG 0x002 /* no "hard error" kernel log messages */
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#define FDOPT_NOERROR 0x0004 /* do not indicate errors, caller will use
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FD_GSTAT in order to obtain status */
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#define FDOPT_AUTOSEL 0x8000 /* read/only option: device performs media
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* autoselection */
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/*
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* Transfer rate definitions. Used in the structures above. They
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* represent the hardware encoding of bits 0 and 1 of the FDC control
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* register when writing to the register.
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* Transfer rates for FM encoding are half the values listed here
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* (but we currently don't support FM encoding).
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*/
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#define FDC_500KBPS 0x00 /* 500KBPS MFM drive transfer rate */
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#define FDC_300KBPS 0x01 /* 300KBPS MFM drive transfer rate */
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#define FDC_250KBPS 0x02 /* 250KBPS MFM drive transfer rate */
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#define FDC_1MBPS 0x03 /* 1MPBS MFM drive transfer rate */
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#endif /* !_MACHINE_IOCTL_FD_H_ */
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