1139731Simp/*- 2127236Salc * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3127236Salc * Copyright (c) 1982, 1986, 1991, 1993 4127236Salc * The Regents of the University of California. All rights reserved. 5127236Salc * (c) UNIX System Laboratories, Inc. 6127236Salc * All or some portions of this file are derived from material licensed 7127236Salc * to the University of California by American Telephone and Telegraph 8127236Salc * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9127236Salc * the permission of UNIX System Laboratories, Inc. 10127236Salc * 11127236Salc * Redistribution and use in source and binary forms, with or without 12127236Salc * modification, are permitted provided that the following conditions 13127236Salc * are met: 14127236Salc * 1. Redistributions of source code must retain the above copyright 15127236Salc * notice, this list of conditions and the following disclaimer. 16127236Salc * 2. Redistributions in binary form must reproduce the above copyright 17127236Salc * notice, this list of conditions and the following disclaimer in the 18127236Salc * documentation and/or other materials provided with the distribution. 19263059Simp * 3. Neither the name of the University nor the names of its contributors 20127236Salc * may be used to endorse or promote products derived from this software 21127236Salc * without specific prior written permission. 22127236Salc * 23127236Salc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24127236Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25127236Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26127236Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27127236Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28127236Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29127236Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30127236Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31127236Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32127236Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33127236Salc * SUCH DAMAGE. 34127236Salc * 35127236Salc * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 36127236Salc */ 37127236Salc 38127236Salc#include <sys/cdefs.h> 39127236Salc__FBSDID("$FreeBSD$"); 40127236Salc 41127236Salc#include <sys/param.h> 42127236Salc#include <sys/kernel.h> 43127236Salc#include <sys/lock.h> 44127236Salc#include <sys/mutex.h> 45127236Salc#include <sys/proc.h> 46127236Salc#include <sys/systm.h> 47127236Salc#include <sys/uio.h> 48127236Salc 49127236Salc#include <vm/vm.h> 50127236Salc#include <vm/vm_page.h> 51127236Salc 52127236Salc#include <machine/vmparam.h> 53127236Salc 54127236Salc/* 55127236Salc * Implement uiomove(9) from physical memory using the direct map to 56127241Salc * avoid the creation and destruction of ephemeral mappings. 57127236Salc */ 58127236Salcint 59127236Salcuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 60127236Salc{ 61127236Salc struct thread *td = curthread; 62127236Salc struct iovec *iov; 63127236Salc void *cp; 64273582Sroyger vm_offset_t page_offset, vaddr; 65127236Salc size_t cnt; 66127236Salc int error = 0; 67127236Salc int save = 0; 68273582Sroyger boolean_t mapped; 69127236Salc 70127236Salc KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 71127236Salc ("uiomove_fromphys: mode")); 72127236Salc KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 73127236Salc ("uiomove_fromphys proc")); 74130028Stjr save = td->td_pflags & TDP_DEADLKTREAT; 75130028Stjr td->td_pflags |= TDP_DEADLKTREAT; 76273582Sroyger mapped = FALSE; 77127236Salc while (n > 0 && uio->uio_resid) { 78127236Salc iov = uio->uio_iov; 79127236Salc cnt = iov->iov_len; 80127236Salc if (cnt == 0) { 81127236Salc uio->uio_iov++; 82127236Salc uio->uio_iovcnt--; 83127236Salc continue; 84127236Salc } 85127236Salc if (cnt > n) 86127236Salc cnt = n; 87127236Salc page_offset = offset & PAGE_MASK; 88127236Salc cnt = min(cnt, PAGE_SIZE - page_offset); 89273582Sroyger if (uio->uio_segflg != UIO_NOCOPY) { 90273582Sroyger mapped = pmap_map_io_transient( 91273582Sroyger &ma[offset >> PAGE_SHIFT], &vaddr, 1, TRUE); 92273582Sroyger cp = (char *)vaddr + page_offset; 93273582Sroyger } 94127236Salc switch (uio->uio_segflg) { 95127236Salc case UIO_USERSPACE: 96218195Smdf maybe_yield(); 97127236Salc if (uio->uio_rw == UIO_READ) 98127236Salc error = copyout(cp, iov->iov_base, cnt); 99127236Salc else 100127236Salc error = copyin(iov->iov_base, cp, cnt); 101127236Salc if (error) 102127236Salc goto out; 103127236Salc break; 104127236Salc case UIO_SYSSPACE: 105127236Salc if (uio->uio_rw == UIO_READ) 106127236Salc bcopy(cp, iov->iov_base, cnt); 107127236Salc else 108127236Salc bcopy(iov->iov_base, cp, cnt); 109127236Salc break; 110127236Salc case UIO_NOCOPY: 111127236Salc break; 112127236Salc } 113273582Sroyger if (__predict_false(mapped)) { 114273582Sroyger pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], 115273582Sroyger &vaddr, 1, TRUE); 116273582Sroyger mapped = FALSE; 117273582Sroyger } 118127236Salc iov->iov_base = (char *)iov->iov_base + cnt; 119127236Salc iov->iov_len -= cnt; 120127236Salc uio->uio_resid -= cnt; 121127236Salc uio->uio_offset += cnt; 122127236Salc offset += cnt; 123127236Salc n -= cnt; 124127236Salc } 125127236Salcout: 126273582Sroyger if (__predict_false(mapped)) 127273582Sroyger pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], &vaddr, 1, 128273582Sroyger TRUE); 129130028Stjr if (save == 0) 130130023Stjr td->td_pflags &= ~TDP_DEADLKTREAT; 131127236Salc return (error); 132127236Salc} 133