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/*
* Copyright (c) 1995 Philip A. Nelson.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Philip A. Nelson.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rd.c,v 1.2 1996/01/12 20:20:38 deraadt Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/disk.h>
static int rdmatch(struct device *parent, void *cf, void *aux);
static void rdattach(struct device *parent, struct device *self, void *aux);
struct rdsoftc {
struct device sc_dev; /* generic device glue */
struct disk sc_dkdev; /* generic disk glue */
};
struct cfdriver rdcd = {
NULL,
"rd",
rdmatch,
rdattach,
DV_DISK,
sizeof(struct rdsoftc),
NULL,
0
};
void rdstrategy __P((struct buf *));
struct dkdriver rddkdriver = { rdstrategy };
#if !defined(RD_SIZE)
# define RD_SIZE 0x200000
#endif
u_char ram_disk[RD_SIZE] = "Ramdiskorigin";
static int
rdmatch(parent, cf, aux)
struct device *parent;
void *cf, *aux;
{
return(((struct cfdata *)cf)->cf_unit == 0);
}
static void
rdattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct rdsoftc *sc = (struct rdsoftc *)self;
printf(" addr 0x%x, size 0x%x\n", ram_disk, RD_SIZE);
/*
* Initialize and attach the disk structure.
*/
bzero(&sc->sc_dkdev, sizeof(sc->sc_dkdev));
sc->sc_dkdev.dk_driver = &rddkdriver;
sc->sc_dkdev.dk_name = sc->sc_dev.dv_xname;
disk_attach(&sc->sc_dkdev);
}
/* operational routines */
int
rdopen(dev, flags, devtype, p)
dev_t dev;
int flags, devtype;
struct proc *p;
{
if (minor(dev) == 0)
return(0);
else
return(ENXIO);
}
int
rdclose(dev, flags, devtype, p)
dev_t dev;
int flags, devtype;
struct proc *p;
{
return(0);
}
int
rdioctl(dev, cmd, addr, flag, p)
dev_t dev;
u_long cmd;
int flag;
caddr_t addr;
struct proc *p;
{
return(ENOTTY);
}
int
rdsize(dev)
dev_t dev;
{
if (minor(dev) == 0)
return(RD_SIZE / DEV_BSIZE);
else
return(0);
}
int
rddump(dev, blkno, va, size)
dev_t dev;
daddr_t blkno;
caddr_t va;
size_t size;
{
return(ENXIO);
}
void
rdstrategy(bp)
struct buf *bp;
{
int loc, size;
char *adr;
if (minor(bp->b_dev) == 0)
loc = bp->b_blkno * DEV_BSIZE;
else {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
return;
}
size = bp->b_bcount;
adr = (char *) bp->b_un.b_addr;
if (loc + size > sizeof(ram_disk)) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
return;
}
if (bp->b_flags & B_READ)
bcopy(&ram_disk[loc], adr, size);
else
bcopy(adr, &ram_disk[loc], size);
biodone(bp);
}
int
rdread(dev, uio)
dev_t dev;
struct uio *uio;
{
return(physio(rdstrategy, NULL, dev, B_READ, minphys, uio));
}
int
rdwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
return(physio(rdstrategy, NULL, dev, B_WRITE, minphys, uio));
}
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