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/* $NetBSD: altmem.c,v 1.6 2017/10/28 04:53:55 riastradh Exp $ */
/*-
* Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca>
* 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. 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: altmem.c,v 1.6 2017/10/28 04:53:55 riastradh Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <dev/altmem/altmemvar.h>
#include "ioconf.h"
struct altmem_softc {
device_t sc_dev;
struct disk sc_dkdev;
void *sc_cookie;
const struct altmem_memops *sc_memops;
size_t sc_size;
};
static dev_type_open(altmemopen);
static dev_type_close(altmemclose);
static dev_type_read(altmemread);
static dev_type_write(altmemwrite);
static dev_type_ioctl(altmemioctl);
static dev_type_strategy(altmemstrategy);
static dev_type_size(altmemsize);
static int altmem_match(device_t, cfdata_t, void *);
static void altmem_attach(device_t, device_t, void *);
const struct bdevsw altmem_bdevsw = {
.d_open = altmemopen,
.d_close = altmemclose,
.d_strategy = altmemstrategy,
.d_ioctl = altmemioctl,
.d_dump = nodump,
.d_psize = altmemsize,
.d_discard = nodiscard,
.d_flag = D_DISK
};
const struct cdevsw altmem_cdevsw = {
.d_open = altmemopen,
.d_close = altmemclose,
.d_read = altmemread,
.d_write = altmemwrite,
.d_ioctl = altmemioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = D_DISK
};
static struct dkdriver altmemdkdriver = {
.d_strategy = altmemstrategy,
.d_minphys = minphys
};
CFATTACH_DECL_NEW(altmem, sizeof(struct altmem_softc), altmem_match,
altmem_attach, NULL, NULL);
static int
altmem_match(device_t parent, cfdata_t match, void *opaque)
{
return 1;
}
static void
altmem_attach(device_t parent, device_t self, void *opaque)
{
struct altmem_softc *sc = device_private(self);
struct altmem_attach_args *aaa = opaque;
char pbuf[9];
sc->sc_dev = self;
sc->sc_cookie = aaa->cookie;
sc->sc_memops = aaa->memops;
sc->sc_size = sc->sc_memops->getsize(sc->sc_cookie);
format_bytes(pbuf, sizeof(pbuf), sc->sc_size);
aprint_naive("\n");
aprint_normal(": %s\n", pbuf);
disk_init(&sc->sc_dkdev, device_xname(self), &altmemdkdriver);
disk_attach(&sc->sc_dkdev);
}
static int
altmemsize(dev_t dev)
{
struct altmem_softc *sc = device_lookup_private(&altmem_cd, DISKUNIT(dev));
if (sc == NULL)
return 0;
return sc->sc_size >> DEV_BSHIFT;
}
static int
altmemopen(dev_t dev, int flag, int fmt, struct lwp *l)
{
struct altmem_softc *sc = device_lookup_private(&altmem_cd, DISKUNIT(dev));
if (sc == NULL)
return ENXIO;
return 0;
}
static int
altmemclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
return 0;
}
static int
altmemread(dev_t dev, struct uio *uio, int flags)
{
if (device_lookup_private(&altmem_cd, DISKUNIT(dev)) == NULL)
return ENXIO;
return physio(altmemstrategy, NULL, dev, B_READ, minphys, uio);
}
static int
altmemwrite(dev_t dev, struct uio *uio, int flags)
{
if (device_lookup_private(&altmem_cd, DISKUNIT(dev)) == NULL)
return ENXIO;
return physio(altmemstrategy, NULL, dev, B_WRITE, minphys, uio);
}
static void
altmemstrategy(struct buf *bp)
{
struct altmem_softc *sc = device_lookup_private(&altmem_cd, DISKUNIT(bp->b_dev));
if (sc == NULL) {
bp->b_error = ENXIO;
biodone(bp);
return;
}
if (bp->b_bcount == 0) {
biodone(bp);
return;
}
sc->sc_memops->strategy(sc->sc_cookie, bp);
biodone(bp);
}
static int
altmemioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct altmem_softc *sc = device_lookup_private(&altmem_cd, DISKUNIT(dev));
struct dkwedge_info *dkw;
switch (cmd) {
case DIOCGWEDGEINFO:
dkw = (void *)data;
strlcpy(dkw->dkw_devname, device_xname(sc->sc_dev),
sizeof(dkw->dkw_devname));
strlcpy(dkw->dkw_wname, "altmem", sizeof(dkw->dkw_wname));
dkw->dkw_parent[0] = '\0';
dkw->dkw_offset = 0;
dkw->dkw_size = sc->sc_size >> DEV_BSHIFT;
strcpy(dkw->dkw_ptype, DKW_PTYPE_UNUSED);
break;
default:
return ENOTTY;
}
return 0;
}
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