1139790Simp/*- 2127241Salc * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 3127241Salc * Copyright (c) 1982, 1986, 1991, 1993 4127241Salc * The Regents of the University of California. All rights reserved. 5127241Salc * (c) UNIX System Laboratories, Inc. 6127241Salc * All or some portions of this file are derived from material licensed 7127241Salc * to the University of California by American Telephone and Telegraph 8127241Salc * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9127241Salc * the permission of UNIX System Laboratories, Inc. 10127241Salc * 11127241Salc * Redistribution and use in source and binary forms, with or without 12127241Salc * modification, are permitted provided that the following conditions 13127241Salc * are met: 14127241Salc * 1. Redistributions of source code must retain the above copyright 15127241Salc * notice, this list of conditions and the following disclaimer. 16127241Salc * 2. Redistributions in binary form must reproduce the above copyright 17127241Salc * notice, this list of conditions and the following disclaimer in the 18127241Salc * documentation and/or other materials provided with the distribution. 19127241Salc * 4. Neither the name of the University nor the names of its contributors 20127241Salc * may be used to endorse or promote products derived from this software 21127241Salc * without specific prior written permission. 22127241Salc * 23127241Salc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24127241Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25127241Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26127241Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27127241Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28127241Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29127241Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30127241Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31127241Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32127241Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33127241Salc * SUCH DAMAGE. 34127241Salc * 35127241Salc * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 36127241Salc */ 37127241Salc 38127241Salc#include <sys/cdefs.h> 39127241Salc__FBSDID("$FreeBSD$"); 40127241Salc 41127241Salc#include <sys/param.h> 42127241Salc#include <sys/kernel.h> 43127241Salc#include <sys/lock.h> 44127241Salc#include <sys/mutex.h> 45127241Salc#include <sys/proc.h> 46127241Salc#include <sys/systm.h> 47127241Salc#include <sys/uio.h> 48127241Salc 49127241Salc#include <vm/vm.h> 50127241Salc#include <vm/vm_page.h> 51127241Salc 52127241Salc#include <machine/vmparam.h> 53127241Salc 54127241Salc/* 55127241Salc * Implement uiomove(9) from physical memory using the direct map to 56127241Salc * avoid the creation and destruction of ephemeral mappings. 57127241Salc */ 58127241Salcint 59127241Salcuiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 60127241Salc{ 61127241Salc struct thread *td = curthread; 62127241Salc struct iovec *iov; 63127241Salc void *cp; 64127241Salc vm_offset_t page_offset; 65127241Salc size_t cnt; 66127241Salc int error = 0; 67127241Salc int save = 0; 68127241Salc 69127241Salc KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 70127241Salc ("uiomove_fromphys: mode")); 71127241Salc KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 72127241Salc ("uiomove_fromphys proc")); 73130028Stjr save = td->td_pflags & TDP_DEADLKTREAT; 74130028Stjr td->td_pflags |= TDP_DEADLKTREAT; 75127241Salc while (n > 0 && uio->uio_resid) { 76127241Salc iov = uio->uio_iov; 77127241Salc cnt = iov->iov_len; 78127241Salc if (cnt == 0) { 79127241Salc uio->uio_iov++; 80127241Salc uio->uio_iovcnt--; 81127241Salc continue; 82127241Salc } 83127241Salc if (cnt > n) 84127241Salc cnt = n; 85127241Salc page_offset = offset & PAGE_MASK; 86127241Salc cnt = min(cnt, PAGE_SIZE - page_offset); 87127241Salc cp = (char *) 88127241Salc IA64_PHYS_TO_RR7(ma[offset >> PAGE_SHIFT]->phys_addr) + 89127241Salc page_offset; 90127241Salc switch (uio->uio_segflg) { 91127241Salc case UIO_USERSPACE: 92218195Smdf maybe_yield(); 93127241Salc if (uio->uio_rw == UIO_READ) 94127241Salc error = copyout(cp, iov->iov_base, cnt); 95127241Salc else 96127241Salc error = copyin(iov->iov_base, cp, cnt); 97127241Salc if (error) 98127241Salc goto out; 99127241Salc break; 100127241Salc case UIO_SYSSPACE: 101127241Salc if (uio->uio_rw == UIO_READ) 102127241Salc bcopy(cp, iov->iov_base, cnt); 103127241Salc else 104127241Salc bcopy(iov->iov_base, cp, cnt); 105127241Salc break; 106127241Salc case UIO_NOCOPY: 107127241Salc break; 108127241Salc } 109127241Salc iov->iov_base = (char *)iov->iov_base + cnt; 110127241Salc iov->iov_len -= cnt; 111127241Salc uio->uio_resid -= cnt; 112127241Salc uio->uio_offset += cnt; 113127241Salc offset += cnt; 114127241Salc n -= cnt; 115127241Salc } 116127241Salcout: 117130028Stjr if (save == 0) 118130023Stjr td->td_pflags &= ~TDP_DEADLKTREAT; 119127241Salc return (error); 120127241Salc} 121