uio_machdep.c revision 266312
119304Speter/*- 219304Speter * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu> 319304Speter * Copyright (c) 1982, 1986, 1991, 1993 419304Speter * The Regents of the University of California. All rights reserved. 519304Speter * (c) UNIX System Laboratories, Inc. 619304Speter * All or some portions of this file are derived from material licensed 719304Speter * to the University of California by American Telephone and Telegraph 819304Speter * Co. or Unix System Laboratories, Inc. and are reproduced herein with 919304Speter * the permission of UNIX System Laboratories, Inc. 1019304Speter * 1119304Speter * Redistribution and use in source and binary forms, with or without 1219304Speter * modification, are permitted provided that the following conditions 1319304Speter * are met: 1419304Speter * 1. Redistributions of source code must retain the above copyright 1519304Speter * notice, this list of conditions and the following disclaimer. 1619304Speter * 2. Redistributions in binary form must reproduce the above copyright 1719304Speter * notice, this list of conditions and the following disclaimer in the 1819304Speter * documentation and/or other materials provided with the distribution. 1919304Speter * 3. Neither the name of the University nor the names of its contributors 2019304Speter * may be used to endorse or promote products derived from this software 2119304Speter * without specific prior written permission. 2219304Speter * 2319304Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2419304Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2519304Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2619304Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2719304Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2819304Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2919304Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3019304Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3119304Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3219304Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3319304Speter * SUCH DAMAGE. 3419304Speter * 3519304Speter * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 3619304Speter */ 3719304Speter 3819304Speter#include <sys/cdefs.h> 3919304Speter__FBSDID("$FreeBSD: stable/10/sys/mips/mips/uio_machdep.c 266312 2014-05-17 13:59:11Z ian $"); 4019304Speter 4119304Speter#include <sys/param.h> 4219304Speter#include <sys/systm.h> 4319304Speter#include <sys/kernel.h> 4419304Speter#include <sys/lock.h> 4519304Speter#include <sys/mutex.h> 4619304Speter#include <sys/proc.h> 4719304Speter#include <sys/sf_buf.h> 4819304Speter#include <sys/uio.h> 4919304Speter 5019304Speter#include <vm/vm.h> 5119304Speter#include <vm/vm_page.h> 5219304Speter#include <vm/vm_param.h> 5319304Speter 5419304Speter#include <machine/cache.h> 5519304Speter 5619304Speter/* 5719304Speter * Implement uiomove(9) from physical memory using a combination 5819304Speter * of the direct mapping and sf_bufs to reduce the creation and 5919304Speter * destruction of ephemeral mappings. 6019304Speter */ 6119304Speterint 6219304Speteruiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio) 6319304Speter{ 6419304Speter struct sf_buf *sf; 6519304Speter struct thread *td = curthread; 6619304Speter struct iovec *iov; 6719304Speter void *cp; 6819304Speter vm_offset_t page_offset; 6919304Speter vm_paddr_t pa; 7019304Speter vm_page_t m; 7119304Speter size_t cnt; 7219304Speter int error = 0; 7319304Speter int save = 0; 7419304Speter 7519304Speter KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE, 7619304Speter ("uiomove_fromphys: mode")); 7719304Speter KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 7819304Speter ("uiomove_fromphys proc")); 7919304Speter save = td->td_pflags & TDP_DEADLKTREAT; 8019304Speter td->td_pflags |= TDP_DEADLKTREAT; 8119304Speter while (n > 0 && uio->uio_resid) { 8219304Speter iov = uio->uio_iov; 8319304Speter cnt = iov->iov_len; 8419304Speter if (cnt == 0) { 8519304Speter uio->uio_iov++; 8619304Speter uio->uio_iovcnt--; 8719304Speter continue; 8819304Speter } 8919304Speter if (cnt > n) 9019304Speter cnt = n; 9119304Speter page_offset = offset & PAGE_MASK; 9219304Speter cnt = ulmin(cnt, PAGE_SIZE - page_offset); 9319304Speter m = ma[offset >> PAGE_SHIFT]; 9419304Speter pa = VM_PAGE_TO_PHYS(m); 9519304Speter if (MIPS_DIRECT_MAPPABLE(pa)) { 9619304Speter sf = NULL; 9719304Speter cp = (char *)MIPS_PHYS_TO_DIRECT(pa) + page_offset; 9819304Speter /* 9919304Speter * flush all mappings to this page, KSEG0 address first 10019304Speter * in order to get it overwritten by correct data 10119304Speter */ 10219304Speter mips_dcache_wbinv_range((vm_offset_t)cp, cnt); 10319304Speter pmap_flush_pvcache(m); 10419304Speter } else { 10519304Speter sf = sf_buf_alloc(m, 0); 10619304Speter cp = (char *)sf_buf_kva(sf) + page_offset; 10719304Speter } 10819304Speter switch (uio->uio_segflg) { 10919304Speter case UIO_USERSPACE: 11019304Speter maybe_yield(); 11119304Speter if (uio->uio_rw == UIO_READ) 11219304Speter error = copyout(cp, iov->iov_base, cnt); 11319304Speter else 11419304Speter error = copyin(iov->iov_base, cp, cnt); 11519304Speter if (error) { 11619304Speter if (sf != NULL) 11719304Speter sf_buf_free(sf); 11819304Speter goto out; 11919304Speter } 12019304Speter break; 12119304Speter case UIO_SYSSPACE: 12219304Speter if (uio->uio_rw == UIO_READ) 12319304Speter bcopy(cp, iov->iov_base, cnt); 12419304Speter else 12519304Speter bcopy(iov->iov_base, cp, cnt); 12619304Speter break; 12719304Speter case UIO_NOCOPY: 12819304Speter break; 12919304Speter } 13019304Speter if (sf != NULL) 13119304Speter sf_buf_free(sf); 13219304Speter else 13319304Speter mips_dcache_wbinv_range((vm_offset_t)cp, cnt); 13419304Speter iov->iov_base = (char *)iov->iov_base + cnt; 13519304Speter iov->iov_len -= cnt; 13619304Speter uio->uio_resid -= cnt; 13719304Speter uio->uio_offset += cnt; 13819304Speter offset += cnt; 13919304Speter n -= cnt; 14019304Speter } 14119304Speterout: 14219304Speter if (save == 0) 14319304Speter td->td_pflags &= ~TDP_DEADLKTREAT; 14419304Speter return (error); 14519304Speter} 14619304Speter