345 lines
8.4 KiB
C
345 lines
8.4 KiB
C
/* $NetBSD: md_root.c,v 1.8 1996/11/08 14:17:08 leo Exp $ */
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/*
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* Copyright (c) 1996 Leo Weppelman.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Leo Weppelman.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/ioctl.h>
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#include <sys/fcntl.h>
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#include <sys/conf.h>
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#include <sys/disklabel.h>
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#include <sys/disk.h>
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#include <sys/dkbad.h>
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#include <dev/cons.h>
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#include <dev/ramdisk.h>
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#include <atari/atari/device.h>
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/*
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* Misc. defines:
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*/
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#define RAMD_CHUNK (9 * 512) /* Chunk-size for auto-load */
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#define RAMD_NDEV 2 /* Number of devices configured */
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struct ramd_info {
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u_long ramd_size; /* Size of disk in bytes */
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u_long ramd_flag; /* see defs below */
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dev_t ramd_dev; /* device to load from */
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};
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/*
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* ramd_flag:
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*/
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#define RAMD_LOAD 0x01 /* Auto load when first opened */
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#define RAMD_LCOMP 0x02 /* Input is compressed */
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struct ramd_info rd_info[RAMD_NDEV] = {
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{
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1105920, /* 1Mb in 2160 sectors */
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RAMD_LOAD, /* auto-load this device */
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MAKEDISKDEV(2, 0, 2), /* XXX: This is crap! (720Kb flop) */
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},
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{
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1474560, /* 1.44Mb in 2880 sectors */
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RAMD_LOAD, /* auto-load this device */
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MAKEDISKDEV(2, 0, 2), /* XXX: This is crap! (720Kb flop) */
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}
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};
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struct read_info {
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struct buf *bp; /* buffer for strategy function */
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long nbytes; /* total number of bytes to read */
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long offset; /* offset in input medium */
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caddr_t bufp; /* current output buffer */
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caddr_t ebufp; /* absolute maximum for bufp */
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int chunk; /* chunk size on input medium */
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int media_sz; /* size of input medium */
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void (*strat)(struct buf *); /* strategy function for read */
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};
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static int loaddisk __P((struct rd_conf *, dev_t ld_dev, struct proc *));
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static int ramd_norm_read __P((struct read_info *));
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#ifdef support_compression
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static int cpy_uncompressed __P((caddr_t, int, struct read_info *));
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static int rd_compressed __P((caddr_t, int, struct read_info *));
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#endif
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/*
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* This is called during autoconfig.
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*/
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void
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rd_attach_hook(unit, rd)
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int unit;
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struct rd_conf *rd;
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{
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if (atari_realconfig && (unit < RAMD_NDEV) && rd_info[unit].ramd_flag) {
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printf ("rd%d:%sauto-load on open. Size %ld bytes.\n", unit,
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rd_info[unit].ramd_flag & RAMD_LCOMP ? " decompress/" : "",
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rd_info[unit].ramd_size);
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rd->rd_type = RD_UNCONFIGURED; /* Paranoia... */
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}
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}
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void
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rd_open_hook(unit, rd)
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int unit;
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struct rd_conf *rd;
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{
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struct ramd_info *ri;
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if(unit >= RAMD_NDEV)
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return;
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ri = &rd_info[unit];
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if (rd->rd_type != RD_UNCONFIGURED)
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return; /* Only configure once */
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rd->rd_addr = malloc(ri->ramd_size, M_DEVBUF, M_WAITOK);
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rd->rd_size = ri->ramd_size;
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if(rd->rd_addr == NULL)
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return;
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if(ri->ramd_flag & RAMD_LOAD) {
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if (loaddisk(rd, ri->ramd_dev, curproc)) {
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free(rd->rd_addr, M_DEVBUF);
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rd->rd_addr = NULL;
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return;
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}
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}
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rd->rd_type = RD_KMEM_ALLOCATED;
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}
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static int
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loaddisk(rd, ld_dev, proc)
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struct rd_conf *rd;
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dev_t ld_dev;
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struct proc *proc;
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{
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struct buf buf;
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int error;
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struct bdevsw *bdp = &bdevsw[major(ld_dev)];
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struct disklabel dl;
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struct read_info rs;
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/*
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* Initialize our buffer header:
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*/
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buf.b_actf = NULL;
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buf.b_rcred = buf.b_wcred = proc->p_ucred;
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buf.b_vnbufs.le_next = NOLIST;
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buf.b_flags = B_BUSY;
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buf.b_dev = ld_dev;
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buf.b_error = 0;
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buf.b_proc = proc;
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/*
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* Setup read_info:
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*/
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rs.bp = &buf;
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rs.nbytes = rd->rd_size;
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rs.offset = 0;
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rs.bufp = rd->rd_addr;
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rs.ebufp = rd->rd_addr + rd->rd_size;
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rs.chunk = RAMD_CHUNK;
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rs.media_sz = rd->rd_size;
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rs.strat = bdp->d_strategy;
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/*
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* Open device and try to get some statistics.
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*/
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if((error = bdp->d_open(ld_dev, FREAD | FNONBLOCK, 0, proc)) != 0)
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return(error);
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if(bdp->d_ioctl(ld_dev, DIOCGDINFO, (caddr_t)&dl, FREAD, proc) == 0) {
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/* Read on a cylinder basis */
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rs.chunk = dl.d_secsize * dl.d_secpercyl;
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rs.media_sz = dl.d_secperunit * dl.d_secsize;
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}
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#ifdef support_compression
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if(ri->ramd_flag & RAMD_LCOMP)
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error = decompress(cpy_uncompressed, rd_compressed, &rs);
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else
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#endif /* support_compression */
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error = ramd_norm_read(&rs);
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bdp->d_close(ld_dev,FREAD | FNONBLOCK, 0, proc);
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return(error);
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}
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static int
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ramd_norm_read(rsp)
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struct read_info *rsp;
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{
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long bytes_left;
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int done, error;
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struct buf *bp;
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int s;
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int dotc = 0;
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bytes_left = rsp->nbytes;
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bp = rsp->bp;
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error = 0;
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while(bytes_left > 0) {
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s = splbio();
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bp->b_flags = B_BUSY | B_PHYS | B_READ;
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splx(s);
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bp->b_blkno = btodb(rsp->offset);
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bp->b_bcount = rsp->chunk;
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bp->b_data = rsp->bufp;
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/* Initiate read */
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(*rsp->strat)(bp);
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/* Wait for results */
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s = splbio();
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while ((bp->b_flags & B_DONE) == 0)
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tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0);
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if (bp->b_flags & B_ERROR)
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error = (bp->b_error ? bp->b_error : EIO);
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splx(s);
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/* Dot counter */
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printf(".");
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if(!(++dotc % 40))
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printf("\n");
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done = bp->b_bcount - bp->b_resid;
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bytes_left -= done;
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rsp->offset += done;
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rsp->bufp += done;
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if(error || !done)
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break;
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if((rsp->offset == rsp->media_sz) && (bytes_left != 0)) {
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printf("\nInsert next media and hit any key...");
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cngetc();
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printf("\n");
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rsp->offset = 0;
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}
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}
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printf("\n");
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return(error);
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}
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#ifdef support_compression
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/*
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* Functions supporting uncompression:
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*/
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/*
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* Copy from the uncompression buffer to the ramdisk
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*/
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static int
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cpy_uncompressed(buf, nbyte, rsp)
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caddr_t buf;
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struct read_info *rsp;
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int nbyte;
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{
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if((rsp->bufp + nbyte) >= rsp->ebufp)
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return(0);
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bcopy(buf, rsp->bufp, nbyte);
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rsp->bufp += nbyte;
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return(0);
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}
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/*
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* Read a maximum of 'nbyte' bytes into 'buf'.
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*/
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static int
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rd_compressed(buf, nbyte, rsp)
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caddr_t buf;
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struct read_info *rsp;
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int nbyte;
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{
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static int dotc = 0;
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struct buf *bp;
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int nread = 0;
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int s;
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int done, error;
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error = 0;
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bp = rsp->bp;
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nbyte &= ~(DEV_BSIZE - 1);
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while(nbyte > 0) {
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s = splbio();
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bp->b_flags = B_BUSY | B_PHYS | B_READ;
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splx(s);
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bp->b_blkno = btodb(rsp->offset);
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bp->b_bcount = min(rsp->chunk, nbyte);
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bp->b_data = buf;
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/* Initiate read */
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(*rsp->strat)(bp);
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/* Wait for results */
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s = splbio();
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while ((bp->b_flags & B_DONE) == 0)
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tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0);
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if (bp->b_flags & B_ERROR)
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error = (bp->b_error ? bp->b_error : EIO);
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splx(s);
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/* Dot counter */
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printf(".");
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if(!(++dotc % 40))
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printf("\n");
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done = bp->b_bcount - bp->b_resid;
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nbyte -= done;
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nread += done;
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rsp->offset += done;
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if(error || !done)
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break;
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if((rsp->offset == rsp->media_sz) && (nbyte != 0)) {
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if(rsp->offset == rsp->media_sz) {
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printf("\nInsert next media and hit any key...");
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if(cngetc() != '\n')
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printf("\n");
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rsp->offset = 0;
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}
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}
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s = splbio();
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splx(s);
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return(nread);
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}
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#endif /* support_compression */
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