diff options
| author | jmcneill <jmcneill@NetBSD.org> | 2009-03-12 00:15:07 +0000 |
|---|---|---|
| committer | jmcneill <jmcneill@NetBSD.org> | 2009-03-12 00:15:07 +0000 |
| commit | 143d11988573b9c85980ef9d64af12c8e863c8b2 (patch) | |
| tree | 53c207e567e5610f439705dff99e8f3e83e3fc1d /sys/dev/altmem | |
| parent | 7d537978612d2639cee753072801ad53f2d8bc26 (diff) | |
Add 'alternative memory' disk device driver.
Diffstat (limited to 'sys/dev/altmem')
| -rw-r--r-- | sys/dev/altmem/altmem.c | 183 | ||||
| -rw-r--r-- | sys/dev/altmem/altmemvar.h | 44 | ||||
| -rw-r--r-- | sys/dev/altmem/files.altmem | 7 |
3 files changed, 234 insertions, 0 deletions
diff --git a/sys/dev/altmem/altmem.c b/sys/dev/altmem/altmem.c new file mode 100644 index 00000000000..524130f26ba --- /dev/null +++ b/sys/dev/altmem/altmem.c @@ -0,0 +1,183 @@ +/* $NetBSD: altmem.c,v 1.1 2009/03/12 00:15:07 jmcneill 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 1.1 2009/03/12 00:15:07 jmcneill 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> + +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 = { + altmemopen, altmemclose, altmemstrategy, altmemioctl, nodump, + altmemsize, D_DISK +}; +const struct cdevsw altmem_cdevsw = { + altmemopen, altmemclose, altmemread, altmemwrite, altmemioctl, + nostop, notty, nopoll, nommap, nokqfilter, D_DISK +}; +static struct dkdriver altmemdkdriver = { altmemstrategy, minphys }; +extern struct cfdriver altmem_cd; + +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; +} diff --git a/sys/dev/altmem/altmemvar.h b/sys/dev/altmem/altmemvar.h new file mode 100644 index 00000000000..599037b8bd9 --- /dev/null +++ b/sys/dev/altmem/altmemvar.h @@ -0,0 +1,44 @@ +/* $NetBSD: altmemvar.h,v 1.1 2009/03/12 00:15:07 jmcneill 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. + */ + +#ifndef _HAVE_DEV_ALTMEM_ALTMEMVAR_H +#define _HAVE_DEV_ALTMEM_ALTMEMVAR_H + +#include <sys/types.h> +#include <sys/buf.h> + +struct altmem_memops { + size_t (*getsize)(void *); + void (*strategy)(void *, struct buf *); +}; + +struct altmem_attach_args { + void *cookie; + const struct altmem_memops *memops; +}; + +#endif /* !_HAVE_DEV_ALTMEM_ALTMEMVAR_H */ diff --git a/sys/dev/altmem/files.altmem b/sys/dev/altmem/files.altmem new file mode 100644 index 00000000000..ac3e653a848 --- /dev/null +++ b/sys/dev/altmem/files.altmem @@ -0,0 +1,7 @@ +# $NetBSD: files.altmem,v 1.1 2009/03/12 00:15:07 jmcneill Exp $ + +define altmemdev { } + +device altmem: disk +attach altmem at altmemdev +file dev/altmem/altmem.c altmem |
