uio_machdep.c revision 218195
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. 19129198Scognet * 3. All advertising materials mentioning features or use of this software 20129198Scognet * must display the following acknowledgement: 21129198Scognet * This product includes software developed by the University of 22129198Scognet * California, Berkeley and its contributors. 23129198Scognet * 4. Neither the name of the University nor the names of its contributors 24129198Scognet * may be used to endorse or promote products derived from this software 25129198Scognet * without specific prior written permission. 26129198Scognet * 27129198Scognet * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28129198Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29129198Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30129198Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31129198Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32129198Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33129198Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34129198Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35129198Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36129198Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37129198Scognet * SUCH DAMAGE. 38129198Scognet * 39129198Scognet * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 40129198Scognet */ 41129198Scognet 42129198Scognet#include <sys/cdefs.h> 43129198Scognet__FBSDID("$FreeBSD: head/sys/arm/arm/uio_machdep.c 218195 2011-02-02 16:35:10Z mdf $"); 44129198Scognet 45129198Scognet#include <sys/param.h> 46129198Scognet#include <sys/kernel.h> 47129198Scognet#include <sys/lock.h> 48129198Scognet#include <sys/mutex.h> 49129198Scognet#include <sys/proc.h> 50129198Scognet#include <sys/systm.h> 51129198Scognet#include <sys/uio.h> 52135658Scognet#include <sys/sf_buf.h> 53129198Scognet 54129198Scognet#include <vm/vm.h> 55129198Scognet#include <vm/vm_page.h> 56129198Scognet 57129198Scognet#include <machine/vmparam.h> 58129198Scognet 59129198Scognet/* 60135658Scognet * Implement uiomove(9) from physical memory using sf_bufs to 61129198Scognet * avoid the creation and destruction of ephemeral mappings. 62129198Scognet */ 63129198Scognetint 64129198Scognetuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 65129198Scognet{ 66129198Scognet struct thread *td = curthread; 67129198Scognet struct iovec *iov; 68129198Scognet void *cp; 69129198Scognet vm_offset_t page_offset; 70129198Scognet size_t cnt; 71129198Scognet int error = 0; 72129198Scognet int save = 0; 73135658Scognet struct sf_buf *sf; 74129198Scognet 75129198Scognet KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 76129198Scognet ("uiomove_fromphys: mode")); 77129198Scognet KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 78129198Scognet ("uiomove_fromphys proc")); 79130028Stjr save = td->td_pflags & TDP_DEADLKTREAT; 80130028Stjr td->td_pflags |= TDP_DEADLKTREAT; 81129198Scognet while (n > 0 && uio->uio_resid) { 82129198Scognet iov = uio->uio_iov; 83129198Scognet cnt = iov->iov_len; 84129198Scognet if (cnt == 0) { 85129198Scognet uio->uio_iov++; 86129198Scognet uio->uio_iovcnt--; 87129198Scognet continue; 88129198Scognet } 89129198Scognet if (cnt > n) 90129198Scognet cnt = n; 91129198Scognet page_offset = offset & PAGE_MASK; 92129198Scognet cnt = min(cnt, PAGE_SIZE - page_offset); 93135658Scognet sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0); 94135658Scognet cp = (char*)sf_buf_kva(sf) + page_offset; 95129198Scognet switch (uio->uio_segflg) { 96129198Scognet case UIO_USERSPACE: 97218195Smdf maybe_yield(); 98129198Scognet if (uio->uio_rw == UIO_READ) 99129198Scognet error = copyout(cp, iov->iov_base, cnt); 100129198Scognet else 101129198Scognet error = copyin(iov->iov_base, cp, cnt); 102176886Scognet if (error) { 103176886Scognet sf_buf_free(sf); 104129198Scognet goto out; 105176886Scognet } 106129198Scognet break; 107129198Scognet case UIO_SYSSPACE: 108129198Scognet if (uio->uio_rw == UIO_READ) 109129198Scognet bcopy(cp, iov->iov_base, cnt); 110129198Scognet else 111129198Scognet bcopy(iov->iov_base, cp, cnt); 112129198Scognet break; 113129198Scognet case UIO_NOCOPY: 114129198Scognet break; 115129198Scognet } 116135658Scognet sf_buf_free(sf); 117129198Scognet iov->iov_base = (char *)iov->iov_base + cnt; 118129198Scognet iov->iov_len -= cnt; 119129198Scognet uio->uio_resid -= cnt; 120129198Scognet uio->uio_offset += cnt; 121129198Scognet offset += cnt; 122129198Scognet n -= cnt; 123129198Scognet } 124129198Scognetout: 125130028Stjr if (save == 0) 126130023Stjr td->td_pflags &= ~TDP_DEADLKTREAT; 127129198Scognet return (error); 128129198Scognet} 129