1139735Simp/*- 2129198Scognet * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3129198Scognet * Copyright (c) 1982, 1986, 1991, 1993 4129198Scognet * The Regents of the University of California. All rights reserved. 5129198Scognet * (c) UNIX System Laboratories, Inc. 6129198Scognet * All or some portions of this file are derived from material licensed 7129198Scognet * to the University of California by American Telephone and Telegraph 8129198Scognet * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9129198Scognet * the permission of UNIX System Laboratories, Inc. 10129198Scognet * 11129198Scognet * Redistribution and use in source and binary forms, with or without 12129198Scognet * modification, are permitted provided that the following conditions 13129198Scognet * are met: 14129198Scognet * 1. Redistributions of source code must retain the above copyright 15129198Scognet * notice, this list of conditions and the following disclaimer. 16129198Scognet * 2. Redistributions in binary form must reproduce the above copyright 17129198Scognet * notice, this list of conditions and the following disclaimer in the 18129198Scognet * documentation and/or other materials provided with the distribution. 19263059Simp * 3. Neither the name of the University nor the names of its contributors 20129198Scognet * may be used to endorse or promote products derived from this software 21129198Scognet * without specific prior written permission. 22129198Scognet * 23129198Scognet * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24129198Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25129198Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26129198Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27129198Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28129198Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29129198Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30129198Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31129198Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32129198Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33129198Scognet * SUCH DAMAGE. 34129198Scognet * 35129198Scognet * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 36129198Scognet */ 37129198Scognet 38129198Scognet#include <sys/cdefs.h> 39129198Scognet__FBSDID("$FreeBSD$"); 40129198Scognet 41129198Scognet#include <sys/param.h> 42129198Scognet#include <sys/kernel.h> 43129198Scognet#include <sys/lock.h> 44129198Scognet#include <sys/mutex.h> 45129198Scognet#include <sys/proc.h> 46129198Scognet#include <sys/systm.h> 47129198Scognet#include <sys/uio.h> 48135658Scognet#include <sys/sf_buf.h> 49129198Scognet 50129198Scognet#include <vm/vm.h> 51129198Scognet#include <vm/vm_page.h> 52129198Scognet 53129198Scognet#include <machine/vmparam.h> 54129198Scognet 55129198Scognet/* 56135658Scognet * Implement uiomove(9) from physical memory using sf_bufs to 57129198Scognet * avoid the creation and destruction of ephemeral mappings. 58129198Scognet */ 59129198Scognetint 60129198Scognetuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 61129198Scognet{ 62129198Scognet struct thread *td = curthread; 63129198Scognet struct iovec *iov; 64129198Scognet void *cp; 65129198Scognet vm_offset_t page_offset; 66129198Scognet size_t cnt; 67129198Scognet int error = 0; 68129198Scognet int save = 0; 69135658Scognet struct sf_buf *sf; 70129198Scognet 71129198Scognet KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 72129198Scognet ("uiomove_fromphys: mode")); 73129198Scognet KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 74129198Scognet ("uiomove_fromphys proc")); 75130028Stjr save = td->td_pflags & TDP_DEADLKTREAT; 76130028Stjr td->td_pflags |= TDP_DEADLKTREAT; 77129198Scognet while (n > 0 && uio->uio_resid) { 78129198Scognet iov = uio->uio_iov; 79129198Scognet cnt = iov->iov_len; 80129198Scognet if (cnt == 0) { 81129198Scognet uio->uio_iov++; 82129198Scognet uio->uio_iovcnt--; 83129198Scognet continue; 84129198Scognet } 85129198Scognet if (cnt > n) 86129198Scognet cnt = n; 87129198Scognet page_offset = offset & PAGE_MASK; 88129198Scognet cnt = min(cnt, PAGE_SIZE - page_offset); 89135658Scognet sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0); 90135658Scognet cp = (char*)sf_buf_kva(sf) + page_offset; 91129198Scognet switch (uio->uio_segflg) { 92129198Scognet case UIO_USERSPACE: 93218195Smdf maybe_yield(); 94129198Scognet if (uio->uio_rw == UIO_READ) 95129198Scognet error = copyout(cp, iov->iov_base, cnt); 96129198Scognet else 97129198Scognet error = copyin(iov->iov_base, cp, cnt); 98176886Scognet if (error) { 99176886Scognet sf_buf_free(sf); 100129198Scognet goto out; 101176886Scognet } 102129198Scognet break; 103129198Scognet case UIO_SYSSPACE: 104129198Scognet if (uio->uio_rw == UIO_READ) 105129198Scognet bcopy(cp, iov->iov_base, cnt); 106129198Scognet else 107129198Scognet bcopy(iov->iov_base, cp, cnt); 108129198Scognet break; 109129198Scognet case UIO_NOCOPY: 110129198Scognet break; 111129198Scognet } 112135658Scognet sf_buf_free(sf); 113129198Scognet iov->iov_base = (char *)iov->iov_base + cnt; 114129198Scognet iov->iov_len -= cnt; 115129198Scognet uio->uio_resid -= cnt; 116129198Scognet uio->uio_offset += cnt; 117129198Scognet offset += cnt; 118129198Scognet n -= cnt; 119129198Scognet } 120129198Scognetout: 121130028Stjr if (save == 0) 122130023Stjr td->td_pflags &= ~TDP_DEADLKTREAT; 123129198Scognet return (error); 124129198Scognet} 125