493 lines
11 KiB
C
493 lines
11 KiB
C
/* $NetBSD: ramd.c,v 1.2 1995/04/16 14:59:03 leo Exp $ */
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/*
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* Copyright (c) 1995 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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/*
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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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u_long ramd_state; /* runtime state see defs below */
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caddr_t ramd_addr; /* Kernel virtual addr */
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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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/*
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* ramd_state:
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*/
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#define RAMD_ALLOC 0x01 /* Memory is allocated */
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#define RAMD_OPEN 0x02 /* Ramdisk is open */
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#define RAMD_INOPEN 0x04 /* Ramdisk is being opened */
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#define RAMD_WANTED 0x08 /* Someone is waiting on struct */
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#define RAMD_LOADED 0x10 /* Ramdisk is properly loaded */
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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, 1), /* XXX: This is crap! (720Kb flop) */
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0, /* Will be set at runtime */
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NULL /* Will be set at runtime */
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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, 1), /* XXX: This is crap! (720Kb flop) */
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0, /* Will be set at runtime */
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NULL /* Will be set at runtime */
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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)(); /* strategy function for read */
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};
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/*
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* Autoconfig stuff....
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*/
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static int ramdmatch __P((struct device *, struct cfdata *, void *));
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static int ramdprint __P((void *, char *));
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static void ramdattach __P((struct device *, struct device *, void *));
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struct cfdriver ramdcd = {
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NULL, "rd", (cfmatch_t)ramdmatch, ramdattach, DV_DULL,
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sizeof(struct device), NULL, 0 };
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static int
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ramdmatch(pdp, cfp, auxp)
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struct device *pdp;
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struct cfdata *cfp;
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void *auxp;
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{
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if(strcmp("rd", auxp) || (cfp->cf_unit >= RAMD_NDEV))
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return(0);
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return(1);
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}
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static void
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ramdattach(pdp, dp, auxp)
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struct device *pdp, *dp;
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void *auxp;
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{
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int i;
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for(i = 0; i < RAMD_NDEV; i++)
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config_found(dp, (void*)i, ramdprint);
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}
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static int
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ramdprint(auxp, pnp)
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void *auxp;
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char *pnp;
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{
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return(UNCONF);
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}
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static int loaddisk __P((struct ramd_info *, struct proc *));
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static void rdminphys __P((struct buf *));
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static int ramd_norm_read __P((struct read_info *));
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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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int
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rdopen(dev, flags, devtype, p)
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dev_t dev;
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int flags, devtype;
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struct proc *p;
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{
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struct ramd_info *ri;
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int s;
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int error = 0;
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if(DISKUNIT(dev) >= RAMD_NDEV)
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return(ENXIO);
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ri = &rd_info[DISKUNIT(dev)];
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if(ri->ramd_state & RAMD_OPEN)
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return(0);
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/*
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* If someone is busy opening, wait for it to complete.
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*/
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s = splbio();
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while(ri->ramd_state & RAMD_INOPEN) {
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ri->ramd_state |= RAMD_WANTED;
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tsleep((caddr_t)ri, PRIBIO, "rdopen", 0);
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}
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ri->ramd_state |= RAMD_INOPEN;
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splx(s);
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if(!(ri->ramd_state & RAMD_ALLOC)) {
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ri->ramd_addr = malloc(ri->ramd_size, M_DEVBUF, M_WAITOK);
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if(ri->ramd_addr == NULL) {
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error = ENXIO;
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goto done;
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}
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ri->ramd_state |= RAMD_ALLOC;
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}
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if((ri->ramd_flag & RAMD_LOAD) && !(ri->ramd_state & RAMD_LOADED)) {
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error = loaddisk(ri, p);
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if(!error)
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ri->ramd_state |= RAMD_LOADED;
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}
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done:
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ri->ramd_state &= ~RAMD_INOPEN;
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if(ri->ramd_state & RAMD_WANTED) {
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ri->ramd_state &= ~RAMD_WANTED;
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wakeup((caddr_t)ri);
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}
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return(error);
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}
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int
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rdclose(dev, flags, devtype, p)
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dev_t dev;
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int flags, devtype;
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struct proc *p;
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{
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return(0);
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}
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int
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rdioctl(dev, cmd, addr, flag, p)
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dev_t dev;
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u_long cmd;
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int flag;
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caddr_t addr;
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struct proc *p;
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{
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return(ENOTTY);
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}
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/*
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* no dumps to ram disks thank you.
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*/
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int
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rdsize(dev)
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dev_t dev;
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{
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return(-1);
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}
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int
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rdread(dev, uio)
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dev_t dev;
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struct uio *uio;
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{
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return (physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL,
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dev, B_READ, rdminphys, uio));
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}
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int
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rdwrite(dev, uio)
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dev_t dev;
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struct uio *uio;
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{
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return(physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL,
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dev, B_WRITE, rdminphys, uio));
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}
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/* XXX: Limit to 64k. */
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static void
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rdminphys(bp)
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struct buf *bp;
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{
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bp->b_bcount = min(bp->b_bcount, (64 * 1024));
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}
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void
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rdstrategy(bp)
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struct buf *bp;
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{
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struct ramd_info *ri;
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long maxsz, sz;
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char *datap;
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ri = &rd_info[DISKUNIT(bp->b_dev)];
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maxsz = ri->ramd_size / DEV_BSIZE;
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sz = (bp->b_bcount + DEV_BSIZE - 1) / DEV_BSIZE;
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if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
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if((bp->b_blkno == maxsz) && (bp->b_flags & B_READ)) {
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/* Hitting EOF */
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bp->b_resid = bp->b_bcount;
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goto done;
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}
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sz = maxsz - bp->b_blkno;
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if((sz <= 0) || (bp->b_blkno < 0)) {
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bp->b_error = EINVAL;
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bp->b_flags |= B_ERROR;
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goto done;
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}
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bp->b_bcount = sz * DEV_BSIZE;
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}
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datap = (char*)((u_long)ri->ramd_addr + bp->b_blkno * DEV_BSIZE);
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if(bp->b_flags & B_READ)
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bcopy(datap, bp->b_data, bp->b_bcount);
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else bcopy(bp->b_data, datap, bp->b_bcount);
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bp->b_resid = 0;
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biodone(bp);
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return;
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done:
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bp->b_resid = bp->b_bcount;
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biodone(bp);
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}
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static int
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loaddisk(ri, proc)
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struct ramd_info *ri;
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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(ri->ramd_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 out 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 = ri->ramd_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 = ri->ramd_size;
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rs.offset = 0;
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rs.bufp = ri->ramd_addr;
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rs.ebufp = ri->ramd_addr + ri->ramd_size;
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rs.chunk = RAMD_CHUNK;
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rs.media_sz = ri->ramd_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(ri->ramd_dev,FREAD | FNONBLOCK, 0, proc))
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return(error);
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if(bdp->d_ioctl(ri->ramd_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 notyet
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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 /* notyet */
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error = ramd_norm_read(&rs);
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bdp->d_close(ri->ramd_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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s = splbio();
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splx(s);
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return(error);
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}
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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) {
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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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