/* $NetBSD: mem.c,v 1.37 2008/03/11 05:34:03 matt Exp $ */ /* * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * @(#)mem.c 8.3 (Berkeley) 1/12/94 */ /* * Copyright (c) 1988 University of Utah. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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 the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * @(#)mem.c 8.3 (Berkeley) 1/12/94 */ /* * Memory special file */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: mem.c,v 1.37 2008/03/11 05:34:03 matt Exp $"); #include <sys/param.h> #include <sys/conf.h> #include <sys/buf.h> #include <sys/systm.h> #include <sys/uio.h> #include <sys/malloc.h> #include <sys/proc.h> #include <sys/kauth.h> #include <uvm/uvm_extern.h> #include <machine/leds.h> #include "leds.h" #define DEV_LEDS 13 /* minor device 13 is leds */ extern paddr_t avail_end; static void *zeropage; dev_type_read(mmrw); dev_type_ioctl(mmioctl); dev_type_mmap(mmmmap); const struct cdevsw mem_cdevsw = { nullopen, nullclose, mmrw, mmrw, mmioctl, nostop, notty, nopoll, mmmmap, nokqfilter, }; /*ARGSUSED*/ int mmrw(dev_t dev, struct uio *uio, int flags) { vaddr_t v; int c; struct iovec *iov; int error = 0; while (uio->uio_resid > 0 && error == 0) { iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("mmrw"); continue; } switch (minor(dev)) { case DEV_MEM: v = uio->uio_offset; if (v < 0 || v >= avail_end) { return (EFAULT); } c = min(iov->iov_len, MAXPHYS); error = uiomove((char *)v + KERNBASE, c, uio); continue; case DEV_KMEM: v = uio->uio_offset; c = min(iov->iov_len, MAXPHYS); if (!uvm_kernacc((void *)v, c, uio->uio_rw == UIO_READ ? B_READ : B_WRITE)) return (EFAULT); error = uiomove((void *)v, c, uio); continue; case DEV_NULL: if (uio->uio_rw == UIO_WRITE) uio->uio_resid = 0; return (0); case DEV_ZERO: if (uio->uio_rw == UIO_WRITE) { c = iov->iov_len; break; } if (zeropage == NULL) { zeropage = (void *) malloc(PAGE_SIZE, M_TEMP, M_WAITOK); bzero(zeropage, PAGE_SIZE); } c = min(iov->iov_len, PAGE_SIZE); error = uiomove(zeropage, c, uio); continue; #if NLEDS case DEV_LEDS: error = leds_uio(uio); /* Yes, return (not break) so EOF works. */ return (error); #endif default: return (ENXIO); } if (error) break; iov->iov_base = (char *)iov->iov_base + c; iov->iov_len -= c; uio->uio_offset += c; uio->uio_resid -= c; } return (error); } paddr_t mmmmap(dev_t dev, off_t off, int prot) { struct lwp *l = curlwp; /* XXX */ /* * /dev/mem is the only one that makes sense through this * interface. For /dev/kmem any physaddr we return here * could be transient and hence incorrect or invalid at * a later time. /dev/null just doesn't make any sense * and /dev/zero is a hack that is handled via the default * pager in mmap(). */ if (minor(dev) != DEV_MEM) return (-1); if ((u_int)off > ctob(physmem) && kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) != 0) return (-1); return (btop((u_int)off)); }